Publications of the

National Bureau of Standards

July 1, 1957, to June 30, 1960

Includes Titles of Papers Published in Outside Journals 1950 to 1959

United States Department of Commerce

National Bureau of Standards

Miscellaneous Publication 240
THE NATIONAL BUREAU OF STANDARDS

Functions and Activities The functions of the National Bureau of Standards are set forth in the Act of

Congress, March 3, 1901, as amended by Congress in Public Law 619, 1950. These

include the development and maintenance of the national standards of measurement

and the provision of means and methods for making measurements consistent with

these standards; the determination of physical constants and properties of materials; the development of methods and instruments for testing materials, devices, and structures; advisory services to government agencies on scientific and technical problems; invention and development of devices to serve special needs of the Government; and the development of standard practices, codes, and specifications. The work includes basic and applied research, development, engineering, instru- mentation, testing, evaluation, calibration services, and various consultation and

information services. Research projects are also performed for other government

agencies when the work relates to and supplements the basic program of the Bureau

or when the Bureau's unique competence is required. The scope of activities is suggested by the listing of divisions and sections on the inside of the back cover. Publications The results of the Bureau's work take the form of either actual equipment

and devices or published papers. These papers appear either in the Bureau's own

series of publications or in the journals of professional and scientific societies. The

Bureau itself publishes three periodicals available from the Government Printing

Office: The Journal of Research, published in four separate sections, presents complete scientific and technical papers; the Technical News Bulletin presents summary and preliminary reports on work in progress; and Basic Radio Propagation

Predictions provides data for determining the best frequencies to use for radio communications throughout the world. There are also five series of nonperiodical

publications: Monographs, Applied Mathematics Series, Handbooks, Miscellaneous

Publications, and Technical Notes. Information on the Bureau's publications can be found in NBS Circular 460, Publications of the National Bureau of Standards ($1.25) and its Supplement

($1.50), available from the Superintendent of Documents, U.S. Government

Printing Office, Washington 25, D.C.
UNITED STATES DEPARTMENT OF COMMERCE • Frederick H. Mueller, Secretary NATIONAL BUREAU OF STANDARDS • A. V. Astin, Dirtctor

Publications of the

National Bureau of Standards

July 1, 1957, to June 30, 1960

Includes Titles of Papers Published in Outside Journals

National Bureau of Standards Miscellaneous Publication 240

To Accompany National Bureau of Standards C460, and Supplement—1901 to June 30, 1957 Issued April 3, 1961

For sale by the Superintendent of Documents, U.S. Government Printing Office, Washington 25, D.C.

Price $2.25

1950 to 1959

(With Subject and Author Indexes)

Betty L. Arnold

CONTENTS

Foreword v

[. General information 1 1.1. Purchase procedures 1

1. 2. Announcements of Bureau publications. 1

1. 3. Catalogs of publications 1

1. 4. Mailing lists 2 1.5. Depository libraries in the United States. 2

1. 6. Field Offices of the U.S. Department of Commerce 7

!. Periodicals of the National Bureau of Standards. 9

2. 1. Journal of Research 9 Section A. Physics and Chemistry 9 Section B. Mathematics and Mathematical Physics 9

Section C. Engineering and Instrumentation 9

Section D. Radio Propagation 9

2. 2. Technical News Bulletin 9

2. 3. Basic Radio Propagation Predictions 9

Page

3. Titles and abstracts of NBS publications 11

3. 1. Research papers 11

3. 2. Papers from Section A 34

3. 3. Papers from Section B 40

3. 4. Papers from Section C 43

3. 5. Papers from Section D 48

3. 6. Circulars 55

3. 7. Monographs 59

3. 8. Handbooks 61

3. 9. Miscellaneous publications 62

3. 10. Building materials and structures re- ports 63

3. 11. Applied mathematics series 64

3. 12. Technical notes 65

4. Titles of papers published in outside journals 1950 to 1959 73

5. Price list of available publications 161

6. Author index 167

7. Subject index 295

iii

FOREWORD

The functions of the National Bureau of Standards are set forth in the Act of Congress, March 3, 1901, as amended by Congress in Public Law 619, 1950. These include the development and maintenance of the national standards of measurement and the provision of means and methods for making

measurements consistent with these standards; the determination of physical constants and properties of materials; the development of methods and in- struments for testing materials, devices, and structures; advisory services to Government agencies on scientific and technical problems, invention and de- velopment of devices to serve special needs of the Government; and the devel- opment of standard practices, codes, and specifications. The work includes

basic and applied research, development, engineering, instrumentation, testing, evaluation, calibration services, and various consultation and information

services. The program is carried out in the following technical divisions and

offices: Electricity, metrology, heat, radiation physics, analytical and inorganic chemistry, mechanics, organic and fibrous materials, metallurgy, mineral products, building research, applied mathematics, data processing systems, atomic

physics, instrumentation, physical chemistry, weights and measures, cryogenic

engineering, ionosphere research and propagation, radio propagation engineering, radio standards, radio systems, upper atmosphere and space physics. The results of the Bureau's work take the form of either actual equipment and devices or published papers, which appear either in the Bureau's own

series of publications or in the journals of professional and scientific societies. The Bureau publishes three periodicals, available from the Government

Printing Office: The Journal of Research, the Technical News Bulletin, and

Basic Radio Propagation Predictions. There are also five series of nonperiodical

publications: Monographs, Handbooks, Applied Mathematics Series, Miscellaneous Publications, and Technical Notes. This publication provides a complete list, with brief abstracts, of Bureau

publications issued during the period July 1, 1957 to June 30, 1960. It also includes a list of those papers by Bureau authors that have appeared in nonNational Bureau of Standards Journals from 1950 through 1959. Circular 460

(for the period 1901 to June 30, 1957) and its Supplement (July 1, 1947 to June

30, 1957) remain in effect. A. V. Astin, Director.

Supplementary List of Publications of the National Bureau of Standards July 1, 1957, to June 30, 1960

This Supplement lists the publications of the National Bureau of Standards from July 1, 1957, to June 30, 1960. A brief abstract for each publication is given. It also includes a list of those papers by Bureau authors that have appeared in non-National Bureau of Standards Journals from 1950 through 1959. Subject and author indexes are included, and general publication information is furnished. This catalog and previous lists (see page 2) give reference to the publications printed by the Bureau during the period 1901

to June 30, 1957. Over 8,000 papers have been issued. Reprints of papers published in outside journals are available only from the authors themselves or from the outside journal.
r

I
1. GENERAL INFORMATION

1.1. PURCHASE PROCEDURES

The publications of the Bureau are distributed

principally by the Superintendent of Documents,

United States Government Printing Office, Washington 25, D.C., who sells them, as long as copies

are available, at the prices given in this Circular. How To Make Remittances. Remittances

for publications for which individual sales or subscription prices are shown should be mailed to Superintendent of Documents, U.S. Government

Printing Office, Washington 25, D.C., by coupon,

postal money express order, or check. Publications cannot be mailed in advance of receipt of remittance. Currency may be sent at sender's

risk. Foreign remittances should be made either by international money order or draft on an American bank.

Foreign money, defaced or smooth coins, will not

be accepted. Do not send postage stamps. The letter symbol with each publication number and the full title of the publication must be

given when ordering. If 100 copies or more of any publication are ordered, a discount of 25

percent is allowed. For the convenience of the general public, coupons in the denomination of 5 cents that are good until used in exchange for Government publications sold by the Superintendent of Documents, may be purchased from his office. Address order to Superintendent of Documents,

U.S. Government Printing Office, Washington 25, Persons who make frequent purchases from

the Superintendent of Documents may find a

deposit account convenient. Deposits of $10 or more are accepted against which orders may be

placed without making individual remittances or

first obtaining quotations. Order blanks are fur- nished for this purpose. After the handling of

the order has been completed, it will be returned

showing the publications supplied, explanations

regarding those not sent, the amount of charge, and the balance on deposit. No charge is made for postage on documents

forwarded to points in United States and possessions, or to Canada, Cuba, Mexico, Newfoundland

(including Labrador), and certain Central and

South American countries. To other countries

the regular rate of postage is charged, and re- mittances must cover such postage. In computing

foreign postage, add one-fourth of the price of the

publication.

1.2. ANNOUNCEMENTS OF BUREAU PUBLICATIONS

There are several official sources of information

as to new publications of the National Bureau of Standards. The following announcements are

issued regularly by governmental agencies. In

addition, many of the technical journals carry

notices of new Bureau publications of interest in their respective fields. Technical News Bulletin. Issued monthly by the National Bureau of Standards. Announces all new publications by members of the

staff, including those appearing in outside journals. Available from the Superintendent of Documents,

U.S. Government Printing Office, Washington 25, D.C. Annual subscription, $1.50; $2.25 foreign. Single copies, 15 cents each. Monthly Catalog of United States Govern- ment Publications. Issued monthly by the Superintendent of Documents, U.S. Government

Printing Office, Washington 25, D.C. Annual

subscription, with consolidated annual index, $3

$4.50 foreign. Price Lists. Publication lists prepared by

the Superintendent of Documents on special subjects. These will be furnished free, on application, if the subject concerning which information

is desired is stated. List of Selected Government Publications.

Issued semimonthly by the Superintendent of Documents. Each list is arranged alphabetically by subjects, with annotations and prices. May

be obtained free from that office. Business Service Check List. Weekly an- nouncements of publications of the Department

of Commerce. Lists titles and prices of National Bureau of Standards publications, as well as those

of other offices of the Department of Commerce.

Available from the Superintendent of Documents

for $1.50 a year domestic; $3.50 foreign.

1.3. CATALOGS OF BUREAU PUBLICATIONS

Previous catalogs and this Circular give a complete list of the titles and brief abstracts of the Bureau's publications up to June 30, 1960. Where

the price is given the publication is available from

the Superintendent of Documents, U.S. Govern- ment Printing Office, Washington 25, D.C, or they may be available for consultation in libraries maintaining sets of Bureau Circulars.

1
Price Price Circular C24, 7th edition: Publications of the Bu- Miscellaneous Publication 240: Publications of the reau of Standards 1901 to 1925. 271 pages, in- National Bureau of Standards July 1, 1957, to eluding brief abstracts and subject index . . . June 30, 1960. Includes Titles of Papers Pub-, Circular C24 Supplement: Supplementary list of lished in Outside Journals 1950 to 1959. 391 pages, publications oi the Bureau of Standards, July 1, including subject and author indexes $2. 25

1925, to December 31, 1931. 214 pages, in- m att Tivrr- iktc

eluding brief abstracts and subject index . ... (*) 1.4. MAILING Ll&lfc

Circular 24 Supplement: Supplementary list of Names of individuals are not placed on the Ltuary T 1932? TbscIS^K f^fie Bureau's mailing lists. The principal distribution

pages, including brief abstracts. The subject and is by the Superintendent oi Documents on a sales author indexes cover the period 1901 to December basis. A. limited edition of each paper is printed

31, 1941

.

. (*) for Bureau administrative needs and for official Circular 460: Publications of the National Bureau distribution to cooperating laboratories, technical

of Standards 1901 to June 30, 1947. 375 pages, . ~ * ° . 'j , i I

including subject and author indexes. Brief organizations, (jovernment agencies, and to leadabstracts are included for the period January l, ing public and educational institutions libraries. 1942, to June 30, 1947 $1. 25 jn addition, the Superintendent of Documents

Supplementary List of Publications of the National distributes copies of selected Bureau publications ?9TM%73^^ to the Government depository libraries listed indexes $1. 50 below.

• Out of print. 1.5. DEPOSITORY LIBRARIES IN THE UNITED STATES

The Superintendent of Documents, United States Government Printing Office, is authorized by law to furnish Government publications to designated depository libraries. The libraries listed below are now receiving certain selected publication series of the National Bureau of Standards for general reference use. Whether or not a given library has a copy of any particular publication can only be determined by inquiry at the library. ALABAMA

Auburn: Alabama Polytechnic Institute Library. Birmingham: Howard College Library. Birmingham Southern College, M. Paul Phillips Library. Public Library.

Florence: State Teachers College Library.

Jacksonville: State Teachers College Library. Mobile (Spring Hill) : The Thomas Bryne Memorial, Spring

Hill College. Montgomery:

Department of Archives and History Library. State and Supreme Court Library. Tuskegee Institute: Hollis Burke Frissell Library.

University: University of Alabama Library. ALASKA

College: University of Alaska Library. Juneau: Alaska Historical Library and Museum. ARIZONA

Flagstaff Arizona State Teachers College Library. Phoenix: Department of Library and Archives. Phoenix Public Library. Tempe: Matthews Library. Tucson: University of Arizona Library. ARKANSAS

Clarksville: College of the Ozarks Library. College Heights: Arkansas Agricultural and Mechanical

College Library. Conway: Hendrix College Library.

Fayetteville: University of Arkansas Library.

Little Rock: Little Rock Public Library. Magnolia: Southern State College, J. M. Peace Library.

Russellville: Arkansas Polytechnic College Library. State College: Arkansas State College Library. CALIFORNIA

Bakersfield: Kern County Free Library. Berkeley: University of California Library.

Claremont: Pomona College, Honnold Library. Davis: University of California Library. Eureka: Eureka Free Library. Fresno: Fresno County Free Library. Long Beach: Public Library. Los Angeles: University of Southern California Library. Los Angeles Public Library. Los Angeles State College Library. Loyola University Library. Occidental College Library. University of California at Los Angeles Library. Northridge: San Fernando Valley State College Library. Oakland: Oakland Public Library. Pasadena: California Institute of Technology Library. Redding: Shasta County Free Library. Redlands: University of Redlands Library. Richmond: Richmond Public Library.

Riverside: Riverside Public Library. Sacramento:

California State Library. City Free Library. San Diego: San Diego Public Library. San Francisco: Mechanics Mercantile Library. San Francisco Public Library. San Francisco State College, Social Science and

Business Library. Santa Barbara: Santa Barbara Public Library. Stanford Univ.: Stanford University Library. Stockton: Stockton Free Public Library. COLORADO

Boulder: University of Colorado Library. Colorado Springs: Colorado College, Coburn Library. Denver:

Colorado State Library. Public Library. Regis College Library.

U.S. Air Force Academy.

University of Denver, Mary Reed Library. Fort Collins: Colorado Stale University Library. Golden: Colorado School of Mines Library. Gunnison: Western State College Library. Pueblo: McClelland Public Library.
CONNECTICUT

Bridgeport: Bridgeport Public Library. Hartford: Connecticut State Library. Hartford Public Library.

Trinity College Library. Middletown: Wesleyan University, Olin Library. New Haven: Yale University Library. New London:

Connecticut College, Palmer Library.

U.S. Coast Guard Academy Library.

Storrs: University of Connecticut Library. Waterbury: Silas Bronson Library. DELAWARE

Newark: University of Delaware Library. Wilmington: Wilmington Institute Free Library. DISTRICT OF COLUMBIA

Washington: Department of Agriculture Library. Department of Commerce Library. Department of Health, Education, and Welfare Li- brary. Department of Interior Central Library. Department of Justice Main Library. Department of State Library. National War College Library. Navy Department Library. Post Office Department Library. Public Library. Treasury Department Library. FLORIDA

Coral Gables: University of Miami Library. De Land: Sampson Library of John B. Stetson University.

Gainesville: University of Florida Library.

Jacksonville: Jacksonville Public Library. Lakeland: Lakeland Public Library. Miami: Miami Public Library.

Tallahassee: Florida Agricultural and Mechanical College Library.

Florida State Library.

Florida State University Library. Tampa: University of Tampa Library. Winter Park: Rollins College, Mills Memorial Library. GEORGIA

Athens: University of Georgia General Library.

Atlanta: Atlanta Public Library. Emory University: Asa Griggs Candler Library. Georgia State Library. Augusta: Library of Richmond County Academy and

Junior College of Augusta.

Collegeboro: Georgia Teachers College Library. Dahlonega: North Georgia College Library.

Milledgeville: Georgia State College for Women Library. Savannah: Savannah Public Library.

Valdosta: Valdosta State College Library.

iiuiiuiuiu: Library of Hawaii.

University of Hawaii Library. IDAHO

Boise:Boise Public Library. Idaho State Law Library.

Caldwell: Strahorn Memorial Library. Moscow: University of Idaho Library.

Pocatello: Idaho State College Library. Rexberg: Ricks College Library. ILLINOIS

Carbondale: Southern Illinois University Library.

Carlinville: Blackburn College Library.

Chicago: Amundsen Junior College Library. Chicago Public Library. Chicago Teachers College Library. John Crerar Library. Newberry Library. University of Chicago Libraries. University of Illinois Library. Decatur: Decatur Public Library.

Elsah: Prinicipia College, Marshall Brooks Library. Evanston: Northwestern University Library. Freeport: Freeport Public Library. Galesburg: Galesburg Public Library.

Jacksonville: MacMurray College Library.

Joliet: Public Library. Kankakee: Olivet Nazarene College Library.

Lisle: St. Procopius College Library. Lockport: Lewis College of Science and Technology

Library. Monmouth: Monmouth College Library. Normal: Illinois State Normal University Library.

Peoria: Peoria Public Library. Rock Island: Rock Island Public Library. Rockford: Public Library.

Springfield: Illinois State Library. Urbana: University of Illinois Library. INDIANA

Bloomington: Indiana University Library.

Crawfordsville: Wabash College Library.

Evansville: Evansville Public Library. Fort Wayne: Public Library. Gary: Gary Public Library.

Greencastle: De Pauw University Library. Hanover: Hanover College Library.

Indianapolis: Indiana State Library. Indianapolis Public Library. Lafayette: Purdue University Library. Muncie: Public Library. Notre Dame: University of Notre Dame Library. Richmond: Morrison-Reeves Library. Terre Haute: Indiana State Teachers College Library.

Valparaiso: Valparaiso University Library. IOWA

Ames: Iowa State College Library. Cedar Falls: Iowa State Teacheis College Library. Council Bluffs: Free Public Library. Des Moines: Iowa State Traveling Library. Public Library. Dubuque: Carnegie Stout Free Public Library.

Fairfield: Fairfield Free Public Library.

Grinnell: Grinnell College Library. Iowa City: State University of Iowa Library. Lamoni: Graceland College Library. Mount Vernon: Cornell College Library. Sioux City: Public Library. KANSAS

Baldwin City: Baker University Library. Emporia: William Allen White Library, Kansas State Teachers College. Hays: Forsyth Library of Fort Hays Kansas State College. Highland: Highland Junior College Library. Lawrence: University of Kansas Library. Manhattan: Kansas State College Library.

Pittsburg: Porter Library, Kansas State Teachers College.

Salina: Kansas Wesleyan University Library. Topeka: Kansas State Historical Society Library. Kansas State Library. Wichita: University of Wichita Library. KENTUCKY

Ashland: Ashland Public Library.

Barbourville: Union College, Abigail E. Weeks Library.
Bowling Green: Western Kentucky State Teachers College

Library.

Danville: Centre College Library. Frankfort: State Law Library. Lexington: University of Kentucky Library.

Louisville: Louisville Free Public Library. University of Louisville Library. Morehead: Johnson Camden Library, Morehead State

College. Murray: Murray State Teachers College Library.

Pikeville: Pikeville College Library. LOUISIANA

Baton Rouge:

Louisiana State University Law Library. Louisiana State University Library. Southern University Library. Lafayette: Southwestern Louisiana Institute Library. Lake Charles: McNeese State College Library. Natchitoches: Northwestern State College of* Louisiana. New Orleans: Law Library of Lousiana. Loyola University Library. New Orleans Public Library. Tulane University, Howard-Tilton Memorial Library. Ruston: Lousiana Polytechnic Institute Library. Shreveport: Shreve Memorial Library. MAINE

Augusta: Maine State Library. Bangor: Bangor Public Library. Brunswick: Bowdoin College Library. Lewiston: Bates College Library. Orono: University of Maine Library. Portland: Portland Public Library.

Waterville: Colby College Library. MARYLAND

Annapolis: Maryland State Library. U.S. Naval Academy Library. Baltimore: Enoch Pratt Free Library. Johns Hopkins University Library. Morgan State College Library. Peabody Institute Library. Chestertown: Washington College, George Avery Bunting

Library. College Park: University of Maryland Library. Gaithersburg: Montgomery County Department of Public

Libraries. Westminster: Western Maryland College Library. MASSACHUSETTS

Amherst: Amherst College Library. University of Massachusetts, Goodell Library. Boston: Boston Athenaeum Library. Boston Public Library. State Library of Massachusetts.

Brookline: Public Library. Cambridge: Harvard College Library, Serials Division. Massachusetts Institute of Technology Library. Lowell: Lowell Textile Institute Library. Lynn: Lynn Public Library. New Bedford: Public Library. Tufts College: Tufts College Library.

Wellesley: Wellesley College Library. Williamstown: Williams College Library. Worcester: American Antiquarian Society Library. Free Public Library.MICHIGAN

Ann Arbor: General Library of University of Michigan.

Battle Creek: Willard Library. Benton Harbor: Benton Harbor Public Library. Bloomfield Hills: Cranbrook Institute of Science Library. 4

Dearborn: Henry Ford Community College Library.

Detroit: Detroit Public Library. University of Detroit Library. Wayne County Public Library. Wayne State University Library. East Lansing: Michigan State College of Agriculture tmd

Applied Science Library.

Flint: Robert N. Mandeville High School Library. Grand Rapids: Grand Rapids Public Library. Houghton: Michigan College of Mining and Technology

Library. Kalamazoo: Public Library. Lansing: Michigan State Library. Mount Pleasant: Central Michigan College Library. Muskegon: Hackley Public Library. Port Huron: Port Huron Public Library. Saginaw: Hoyt Public Library. MINNESOTA

Collegeville: St. Johns University Library. Duluth: Duluth Public Library. Minneapolis:

Public Library. University of Minnesota Library. Moorhead: State Teachers College Library.

Northfield: Carleton College Library.

St. Olaf College Library. Saint Peter: Gustavus Adolphus College Library.

St. Paul: Minnesota Historical Society Library. Minnesota State Law Library.

St. Paul Public Library.

Stillwater: Stillwater Public Library. MISSISSIPPI

Cleveland: W. B. Roberts Memorial Library, Delta State Teachers College. Columbus: J. C. Fant Memorial Library of Mississippi State College for Women.

Hattiesburg: Mississippi Southern College Library. Jackson:

Mississippi Library Commission.

Mississippi State Library. State College: Mississippi State College, Mitchell Memorial

Library. University: University of Mississippi Library. MISSOURI

Cape Girardeau: Kent Library, Southeast Missouri State

College. Columbia: University of Missouri Library. Fulton: Westminster College Library. Hannibal: Free Public Library.

Jefferson City: Lincoln University Library. Missouri Supreme Court Library. Kansas City: Kansas City Public Library. Rockhurst College Library. University of Kansas City Library.

Liberty: William Jewell College Library.

Rolla: School of Mines & Metallurgy Library.

St. Joseph: St. Joseph Public Library.

St. Louis:

St. Louis Public Library.

St. Louis University Library. Washington University Library.

Springfield: Drury College Library. Warrensburg: Central Missouri State College Library. MONTANA

Bozeman: Montana State College Library. Butte: Montana School of Mines Library. Helena: Helena Public Library.

Historical Society of Montana Library. Missoula: State University of Montana Library.
NEBRASKA

Blair: Dana College Library.

Crete: Whitin Library of Doane College. Fremont: Midland College Library.

Lincoln: Nebraska State Library. University of Nebraska Library. Omaha:

Municipal University of Omaha Library. Omaha Public Library.

Scottsbluff: Scottsbluff Public Library. NEVADA

Carson City: Nevada State Library. Hawthorne: Mineral County Public Library. Reno: University of Nevada Library. NEW HAMPSHIRE

Concord: New Hampshire State Library. Dover: Dover Public Library. Durham: University of New Hampshire Library Hanover: Dartmouth College Library. Laconia: Laconia Public Library. Manchester: City Library. NEW JERSEY

Atlantic City: Free Public Library. Bayonne: Free Public Library. Camden: Camden Free Public Library. Convent Station: Santa Maria Library of College of St. Elizabeth. Elizabeth: Public Library.

Jersey City: Free Public Library. Madison: Rose Memorial Library. New Brunswick:

Free Public Library. Rutgers University Library. Newark: Public Library.

Princeton: Princeton University Library. Rutherford: Fairleigh Dickinson College Library. South Orange: Seton Hall University Library. Trenton:

Division of State Library, Archives and History- Department of Education.

Free Public Library. NEW MEXICO

Albuquerque: University of New Mexico. Hobbs: Hobbs Public Library. Las Vegas: New Mexico Highlands University, Rodgers

Library. Santa Fe: New Mexico State Law Library.

Silver City: New Mexico State Teachers College Library.

State College: New Mexico College of Agriculture and

Mechanic Arts Library. NEW YORK

Albany: New York State Library. Brooklyn: Brooklyn College Library. Brooklyn Public Library. Pratt Institute Library.

Buffalo: Buffalo and Erie County Public Library. Grosvenor Library. Canton: St. Lawrence University Library. Elmira: Elmira College Library. Farmingdale: Long Island Agricultural and Technical

Institute Library.

Flushing: Queens College Library. Glens Falls: Crandall Library. Hamilton: Colgate University Library.

Ithaca:Albert R. Mann Library, New York State Colleges of Agriculture and Home Economics.

Cornell University Library.

Jamaica: Queens Borough Public Library.

St. Johns University Library. New York City: College of the City of New York Library. Columbia University Library. Cooper Union Library. Fordham University Library. New York Law Institute Library. New York Public Library (Astor Branch). New York Public Library (Lenox Branch). New York State Maritime College Library. New York University General Library. Newburgh: Newburgh Free Library. Potsdam: Clarkson College of Technology Library. Poughkeepsie: Vassar College Library. Rochester: Rochester Public Library, Edgerton Branch.

University of Rochester Library.

St. Bonaventure: St. Bonaventure College Library. Schenectady: Union College Library. Staten Island: Wagner College Library, Grymes Hill. Syracuse: Syracuse University Library. Troy: Troy Public Library.

Utica: Utica Public Library. West Point: U.S. Military Academy.

Yonkers: Yonkers Public Library. NORTH CAROLINA

Chapel Hill: University of North Carolina Library.

Charlotte: Queens College Library. Cullowhee: Western Carolina College Library. Davidson: Library of Davidson College. Durham: Duke University Library. Greensboro: Agricultural and Technical College Library.

Greenville: East Carolina College Library. Pembroke: Pembroke State College Library.

Raleigh: D. H. Hill Library of North Carolina State College. North Carolina State Library.

Salisbury: Catawba College Library. Wilson: Atlantic Christian College, Clarence L. Hardy

Library. Winston-Salem:

Public Library of Winston-Salem and Forsyth County. Wake Forest College Library. NORTH DAKOTA

Bismarck:

State Historical Library. State Law Library. Fargo: North Dakota Agricultural College and Experiment

Station Library. Grand Forks: University of North Dakota Library. Minot: State Teachers College Library. Valley City: State Teachers College Library. OHIO

Akron: Akron Public Library.

Alliance: Mt. Union College Library. Ashland: Ashland College Library. Athens: Ohio University Library.

Bluffton: Musselman Library of Bluffton College. Bowling Green: Bowling Green State University Library. Bucyrus: Bucyrus Public Library.

Cincinnati: Public Library. University of Cincinnati Library. Cleveland: Adelbert College Library of Western Reserve University. Cleveland Public Library. Columbus: Columbus Public Library. Ohio State Library. Ohio State University Library. Dayton: Dayton Public Library.

5
Delaware: Charles Slocum Library of Ohio Wesleyan

University. Gambier: Kenyon College Library.

Granville: Denison University Library. Hiram: Hiram College Library. Marietta: Marietta College Library.

Oberlin: Oberlin College Library. Oxford: Miami University Library. Portsmouth: Free Public Library.

Springfield: Warder Public Library.

Steubenville: Carnegie Library. Toledo: Toledo Public Library. Van Wert: Brumback Library of Van Wert County. Youngstown: Youngstown Public Library. OKLAHOMA

Ada: East Central State Teachers College Library. Alva: Northwestern State Teachers College Library. Durant: Southeastern Teachers College Library. Edmond: Central State College Library. Enid: Carnegie Public Library. Langston: Langston University Library. Norman: University of Oklahoma Library. Oklahoma City: Oklahoma State Library. Shawnee: Oklahoma Baptist University Library.

Stillwater: Oklahoma State University Library. Tahlequah: Northeastern State Teachers College Library.

Tulsa: University of Tulsa Library. Weatherford: Southwestern State College Library. OREGON

Ashland: Southern Oregon College of Education Library.

Corvallis: Oregon State College Library. Eugene: University of Oregon Library. Forest Grove: Pacific University Library. La Grande: Eastern Oregon College of Education Library. Portland: Library Association of Portland. Reed College Library. Salem: Oregon State Library. PENNSYLVANIA

Allentown: Muhlenberg College Library. Bethlehem: Lehigh University Library. Bradford: Carnegie Public Library.

Carlisle: Dickinson College Library.

Erie: Erie Public Library. Hanisburg: Pennsylvania State Library. Haverford: Haverford College Library. Huntingdon: Juniata College Library. Lancaster: Franklin and Marshall College, Fackenthal

Library. Meadville: Allegheny College Library.

Philadelphia: Free Library of Philadelphia. Philadelphia Commercial Museum Library. Temple University, Sullivan Memorial Library. University of Pennsylvania Library. Pittsburgh: Allegheny Regional Branch Library. Carnegie Library of Pittsburgh. University of Pittsburgh Library. Reading: Reading Public Library. Scranton: Scranton Public Library. State College: Pennsylvania State University Library. Swarthmore: Swarthmore College Library. Warren: Warren Library Association. Washington: Memorial Library of Washington and

Jefferson College. Wilkes-Barre: Kings College Library. Williamsport: James V. Brown Library. PUERTO RICO

Mayaguez: University of Puerto Rico, College of Agri- culture and Mechanical Arts Library. Rio Piedras: University of Puerto Rico General Library. 6

RHODE ISLAND

Kingston: University of Rhode Island Library. Providence: Brown University Library. Providence Public Library. Rhode Island State Library. Westerly: Westerly Public Library. SOUTH CAROLINA

Charleston: Charleston College Library. Clemson: Clemson College Library. Columbia: South Carolina State Library. University of South Carolina Library. Orangeburg: State Agricultural and Mechanical College. Rockhill: Carnegie Library of Winthrop College. SOUTH DAKOTA

Brookings: Lincoln Memorial Library of South Dakota

State College. Mitchell: Dakota Wesleyan University Library.

Pierre: South Dakota Free Library Commission.

Sioux Falls: Carnegie Free Public Library.

Spearfish: Black Hills Teachers College Library.

Vermillion: University of South Dakota Library. Yankton: Yankton College Library. TENNESSEE

Chattanooga: Chattanooga Public Library.

Clarksville: Austin Peay State College Library. Johnson City: East Tennessee State College Library.

Knoxville: University of Tennessee Library. Martin: University of Tennessee Library, Martin Branch. Memphis: Cossitt Library. Murfreesboro: Middle Tennessee State College Library.

Nashville: Joint University Libraries. Nashville Public Library. State Library Division, Tennessee State Library and

Archives. Sewanee: University of the South Library. TEXAS

Abilene: Hardin Simmons University Library.

Austin: Texas State Library. University of Texas Library. Beaumont: Lamar State College of Technology Library. Canyon: West Texas State Teachers College Library. College Station: Agriculture and Mechanical College of Texas Library. Commerce: East Texas State Teachers College Library.

Dallas:Dallas Public Library. Southern Methodist University Library. Denton: North Texas State Teachers Library. El Paso: El Paso Public Library. Fort Worth:

Fort Worth Public Library. Texas Christian University Library. Galveston: Rosenberg Library. Houston: Houston Public Library. University of Houston Library.

Huntsville: Sam Houston State Teachers College, Estill Library.

Kingsville: Texas College of Arts and Industries Library. Lubbock: Texas Technological College Library. Marshall: Bishop College Library. San Antonio: Public Library (La Villita Annex). San Marcos: Southwest Texas State Teachers College

Library. Waco: Baylor University Library.
UTAH

Ephraim: Snow College Library. Logan: Utah State Library of Agriculture and Applied

Science Library. Ogden: Carnegie Free Library. Provo: Brigham Young University Library.

Salt Lake City: University of Utah Library. Utah State Library.VERMONT

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Elkins: Davis and Elkins College Library. Fairmont: Fairmont State College Library. Huntington: Marshall College Library.

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Appleton: Lawrence College Library.

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Superior: Superior Public Library. Curran Library, Wisconsin State College. WYOMING

Casper: Natrona County Public Library. Cheyenne: Wyoming State Library. Laramie: University of Wyoming Library.

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2. PERIODICALS OF THE NATIONAL BUREAU OF STANDARDS

2.1. JOURNAL OF RESEARCH

The Journal of Research reports research and develop- ment in physics, mathematics, chemistry, and engineering. Comprehensive scientific papers give complete details of the work, including laboratory data, experimental procedures, and theoretical and mathematical analyses. The Journal

also presents review articles by recognized authorities and compilations of information on subjects closely related

to the Bureau's technical program. The Journal of Research is issued in four separate sections as follows: A. PHYSICS AND CHEMISTRY

This section presents papers of interest primarily to

scientists working in these fields. It covers a broad range

of physical and chemical research, with major emphasis on

standards of physical measurement, fundamental constants, and properties of matter. Issued six times a year. B. MATHEMATICS AND MATHEMATICAL PHYSICS

This section presents studies and compilations designed mainly for the mathematician and theoretical physicist. Topics in mathematical statistics, theory of experiment

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computer systems are covered, together with short numerical tables. Issued quarterly.

C. ENGINEERING AND INSTRUMENTATION

This section reports results of interest chiefly to the

engineer and the applied scientist. It includes many of the new developments in instrumentation resulting from

the Bureau's work in physical measurement, data processing, and development of test methods. It also covers some of the work in acoustics, applied mechanics,"building

research, and cryogenic engineering. Issued quarterly. D. RADIO PROPAGATION

This section reports research in radio propagation, communications, and upper atmospheric physics. Topics

covered include propagation in ionized media, scattering by turbulence, effect of irregular terrain on propagation,

diffraction and scattering by solid obstacles, propagation through time-varying media, surface waves, and

antennas. Issued six times a year.

2.2. TECHNICAL NEWS BULLETIN

This monthly publication summarizes the current

research development, and test activities of the Bureau. The articles are brief, with emphasis on the results of research and their significance, chosen for their importance

to other scientists, engineers, and to industry. Resumes

of longer research reports, important national and inter- national conferences on fundamental science in which the Bureau has represented the Nation, and a bibliography

of all publications by members of the staff as published

are included. The Bulletin is designed to give a succinct account of the current work of the Bureau.

2.3. BASIC RADIO PROPAGATION PREDICTIONS

This is a monthly publication for those concerned with

radio communication in determining the best sky-wave

frequencies over any path at any time of day for average

conditions for the month of prediction, which are made

three months in advance. Charts of extraordinary-wave

critical frequency for the F2 layer and of maximum

usable frequency for a transmission distance of 4,000 km,

of highest frequency of sporadic-E in excess of 15 MC are included. In addition, there are various maps, charts, diagrams, and nomograms needed to make practical application of the world-contour charts, together with examples of their use. ANNUAL SUBSCRIPTION Domestic 1 Foreign 2 Journal of Research of the National Bureau of Standards:

Section A. Physics and Chemistry,

issued six times a year, paper

$4. 00 $4. 75 Bound volume (1 volume per

year), blue buckram (

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) (3) Section B. Mathematics and Mathematical Physics, issued quarter2. 25 2. 75 Bound volume (1 volume per

(

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year) salmon buckram (

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) Section C. Radio Propagation,

issued six times a year, paper

covers 4. 00 4. 75 Bound volume (1 volume per

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1 United States and its possessions, Canada, Cuba, Mexico, Newfoundland

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2 Foreign price includes the cost of the publication and postage.

3 Prices of the bound volumes vary. The Superintendent of Documents

will furnish prices on request.

1 These two monthly periodicals may be obtained on a 1-, 2-, 3-year subscription basis (although no reduction in rates can be made).

9

3. TITLES AND ABSTRACTS OF NBS PUBLICATIONS

The prices of the publications are shown in "Price list of available publications" on

page 161. The publication may be purchased from the Superintendent of Documents, U.S. Government Printing Office, Washington 25, D.C. (The only exception is the Technical Note Series, see page 165.) If the price is omitted, the publication is out of print, but may

be consulted in libraries maintaining reference sets of Bureau publications. Abstracts of publications issued prior to July 1, 1957, are included in Circulars 24, 460, and 460 supple- ment. The letter-symbol designations given below are used in this Circular for the publication

series indicated, and these letters should be included with the serial number in all requests and references to Bureau publications:

J, Journal of Research

A. Physics and Chemistry

B. Mathematics and Mathematical Physic

C. Engineering and Instrumentation D. Radio Propagation

C, Circulars.

Mono., Monographs.

H, Handbooks. MP, Miscellaneous Publications. BMS, Building Materials and Structures Reports. AMS, Applied Mathematics Series. TN, Technical Note Series (use PB number)

.

3.1. RESEARCH PAPERS

Research Papers are reprints of individual

articles that appeared in Volumes 1-62 of the monthly Journal of Research. They were made

available in this form primarily to serve the needs

of research workers and technical groups. In

July 1959 the Bureau began publishing the Journal in four separate sections (page 34) and

Research Papers were discontinued. RESEARCH PAPERS FROM JOURNAL OF RESEARCH OF THE

NATIONAL BUREAU OF STANDARDS, VOLUME 59, JULY- DECEMBER J957 RP2768. Thermal length changes of some refractory

castables, S. J. Schneider and L. E. Mong

The changes in length exhibited by a variety of refractory

castables during complete heating and cooling cycles were

determined. The tests consisted of determinations on

castable specimens that had been heat treated at either

110°, 1,050°, or 1,300° C. A detailed description of the apparatus is given, especially that of the dilatometer

assemblies. These assemblies incorporated differential transformers to give a record of length changes as they

occurred. The data suggested that the same general length-change characteristics were exhibited by castables that had received the same curing and heat treatment. Length-change curves of all three groups illustrated silica inversions. Curves of the 110° C group indicated contractions associated with cement reactions, namely, the

loss of water of hydration and the conversion of amorphous

alumina to y alumina. 8 p. RP2769. Precise intercomparison of acids by differential potentiometric titration with hydrogen elec- trodes, R. G. Bates and E. Wichers The purity of two preparations of benzoic acid, three of

oxalic acid, and three of potassium hydrogen phthalate

has been compared by a precise determination of the

equivalence of each substance with the same solid reference

base, sodium carbonate, the only requirements for which

were that its composition be uniform and remain constant throughout the series of measurements. The inflection point in each titration was determined by a differential 569918 0—61 2

potentiometric method utilizing two hydrogen electrodes. The procedure, which gives a degree of precision greater than has previously been reported for acidimetric deter- minations, is described in detail. When about 0.06 equivalent of acid was used in each titration, the reproducibility attainable was better than 0.002 percent. The failure of the inflection point and the equivalence point to coincide exactly has been considered in evaluating the reliability of the procedure. The purity of one of the samples of benzoic acid, as determined independently from accurate measurements

of the freezing point, was 99.997 mole percent. Single

crystals of benzoic acid grown from a melt of this material were selected as a reference acid and were regarded to have

a purity of 100.000 percent. In terms of this reference, a

preparation of potassium hydrogen phthalate consisting of optically perfect crystals was found to have a purity of 100.000 percent. The method is adaptable to a variety

of acids and bases and, hence, provides an additional

criterion of purity for these substances. 9 p. RP2770. Mixed-path ground-wave propagation : 2. Larger

distances, J. R. Wait and J. Householder The theoretical results given in part 1 (NBS Research Paper 2687) for ground wave propagation over a mixed

path on a flat earth are generalized to a spherical earth. The problem is formulated in terms of the mutual im- pedance between two vertical dipoles which are located on

either side of the boundary of separation. Extensive

numerical results are given in graphical form for a mixed

land-sea path at frequencies of 10, 20, 50, 100, and 200

kilocycles per second. 8 p. RP2771. A spectroscopic study of oils used in oil-extended rubber, F. J. Linnig and J. E. Stewart Knowledge of the composition of oils used in oil-extended rubber is useful in specifying oil types and in understanding

the properties of the oil-rubber master batches. In this work, elucidation of structure has been attempted by a comparison of infrared spectra between 2 and 15 microns

of two series of oil fractions obtained by basically different methods. Fractions of a number of different oils or oil distillates were studied. The spectra were compared with

reference to the method of separation and in some cases to the physical and chemical properties of the fractions. There are marked similarities between certain of the 11
fractions separated by the two methods. However, the study indicates a variability of structural types from one

oil to another. This is especially true for the more polar

fractions. It is suggested that this varability, especially with respect to polar groups and other structures leading

to active hydrogens, could account for the observed variability in the aging properties of master batches containing

different oils or oil fractions. Spectra were also obtained of a few' typical fractions in the ultraviolet range between 210 and 340 millimicrons and in the far infrared between 15 and 40 microns. 14 p. RP2772. Infrared spectra of sugar acetates in solution, H. S. Isbell, F. A. Smith, E. C. Creitz, H.

L. Frush, J. D. Moyer, and J. E. Stewart

Infrared absorption spectra are reported for a group of structurally and configurationally related carbohydrate

derivatives. The conformation of the pyranose ring and

other structural features of the compounds are discussed

in relation to the spectra. Most of the absorption that is characteristic of the cyclic carbohydrate structure occurs

in the region of 8.4 to 15 m- Although the spectra are complex and difficult to interpret, they show features from

which a number of provisional conclusions have been

drawn.

It was found that fully acetylated monosaccharides

with an axial glycosidic acetate group give a moderately

strong absorption band at 8.63 ±0.04 n, and at most a weak band at 8.87 ±0.06 n; whereas compounds having

an equatorial glycosidic acetate group absorb weakly at 8.63 ii, and give a moderately strong band at 8.87 fi. The

spectra for the acetates having the gulo-, ido-, or talo- configurations appear to indicate the presence of the C'2,

or less common chair conformation, or a mixture of conformations. Acetylated methyl glycosides with the methoxyl group

in the axial position give characteristic absorption at 8.33 ±0.02 n and at 8.80±0.05 n', none of the compounds

with the methoxyl group in the equatorial position shows

absorption in these regions. Absorption at 8.80 n is enhanced further by the presence of axial acetyl groups on

the ring. On the basis of this generalization, an acetyl- ated methyl glycoside with the 0-gulo structure gives evidence for the presence of the C'2 conformation. Overlapping bands in the region of 8.0 to 8.2 n arise from acetyl groups of diverse character, with the result that spectra in this region show characteristic features for some compounds. Thus the pyranose acetates of the

pentoses and of rhamnose give a sharp, well-defined band

at 8.0 y,, but the acetates of the hexoses and higher sugars

give a poorly defined band that seems to include an over- lapping component with a maximum at higher wavelength. This characteristic may serve to distinguish acetates that do, or do not, have a primary acetyl group

38 p. RP2773. A problem in self-heating of a spherical body,

S. M. Genensky An analytic steady-state solution is developed for a

spherical body in which heat is generated according to a

first-order unimolecular-reaction law, and lost at the surface

in accordance with Newton's law of cooling. The temperature within the sphere depends chiefly on the radial distance from the center, but also on the ambient temperature, the surface heat-loss coefficient, and the material

properties, which are assumed constant. 3 p. RP2774. Properties of arsenic sulfide glass, F. W. Glaze, D. H. Blackburn, J. S. Osmalov, D. Hubbard, and M. H. Black Samples of arsenic sulfide glass were investigated to determine their chemical and physical properties. Among

the properties reported are the hygroscopicity, chemical

durability, hydrogen electrode function, expansivity,

elastic moduli, modulus of rupture, hardness, trans- mittance, and indices of refraction.

The main interest in arsenic sulfide glass, for the present, :

' is for its transmittance in the infrared. It is transparent j to infrared energy out to approximately 13 microns. Although its physical properties are inferior to those of | ordinary silicate glasses, they are superior to those of some j of the available materials used in infrared optics. 10 p. i RP2775. Thermal conductivity of beryllium oxide from j

i 40° to 750° C, D. A. Ditmars and D. C. Ginnings The thermal conductivity of beryllium oxide has been j measured by an absolute method from 40° to 750° C. The apparatus employed steady-state longitudinal heat

flow along a rod of high-fired beryllium oxide, surrounded 1 by a tube with matching temperature gradient to mini- mize radial heat loss. The estimated accuracy of the measurements is about 3 percent. However, the values

of thermal conductivity of the ideal beryllium oxide

crystal are probably considerably higher than the values given because of the lower density (87 percent theoretical)

of the sample used. 7 p. RP2776. A self-balancing direct-current bridge for accu-

; rate bolometric power measurements, G. F. Engen

Until recently, the most accurate microwave power measurements of the bolometric type have required the use of a manual d-c bridge. A self-balancing d-c bridge has been developed that preserves the inherent accuracy '< of the manual bridge, extends the dynamic range of operation, and greatly simplifies the operating procedure. A general description of the equipment and operating techniques is given, followed by a comprehensive survey

of the sources of error accompanying the method and the accuracy achieved. 5 p. RP2777. Some observations on hydrated monocalcium

aluminate and monostrontium aluminate,

E. T. Carlson Monocalcium aluminate hydrate, probably having the composition CaO.Al2 O3 .10H2 O, was prepared by precipitation from calcium aluminate solutions at 1° C, and by

hydration of pastes of monocalcium aluminate or alumi- nous cement. It was obtained as hexagonal prisms, very weakly birefringent, with mean index 1.471. Three molecules of water were expelled by drying over CaCl2 , without apparent change in crystal structure; however, the struc- ture was destroyed by heating to 175° C. Monostron- tium aluminate hydrate was obtained by analogous methods in the form of minute needles or prisms with mean index 1.478. The maximum degree of hydration was not successfully determined, as the compound under- went decomposition to 3SrO.Al2 03 .6H2 0 and gibbsite. X-ray diffraction powder patterns indicate a close similar- ity in structure between the monocalcium and monostrontium aluminate hydrates. 5 p. RP2778. Turbidity and viscosity measurements on some

cationic detergents in water and in sodium

chloride solutions, L. M. Kushner, W. D. Hubbard, and R. A. Parker

Light-scattering and viscosity measurements were made on solutions of three cationic detergents in distilled water and in various solutions of sodium chloride. The

detergents were dodecylamine hydrochloride, dodecyl- trimethylammonium chloride, and tetradecyltrim ethyl- ammonium chloride. The first of these was investigated

at 30° C and the others at 23° C. The micellar weight and the intrinsic viscosity of the micelles of each deter- gent were calculated, and the dependence of these quantities on the concentration of sodium chloride is discussed. 7 p. 12
RP2779. Relative stress-optical coefficients of some

National Bureau of Standards optical glasses, R. M. Waxier and A. Napolitano The relative stress-optical coefficients of 27 optical

glasses made at the National Bureau of Standards have

been determined. The glasses were loaded in compression, and the amount of birefringence was measured with a

polarimeter, using a quarter-wave plate compensator. The stress-optical coefficients determined for the crown

glasses ranged between +2.95 and +1.82 brewsters. For the flint glasses, a regular variation of the stress- optical coefficient with weight percent of lead oxide was

found with values ranging from +3.18 to —1.16 brewsters.

5 p. RP2780. Physicochemical studies of the destructive

alkali-aggregate reaction in concrete, R. G. Pike and D. Hubbard

In a further study of the alkali-aggregate reaction in high-alkali cements, 11 reactive and nonreactive experi- mental aggregates were examined by several procedures. On comparing the results of each method with the standard expansion-bar test, it appears that each property

studied has some bearing on the expansion characteristics

of each aggregate. For example (1) The chemical durability

as determined by the interferometer procedure was poor

for the aggregates that showed excessive expansion, but

not all aggregates that are shown to be chemically reactive by this procedure will cause expansion, (2) all aggregates

are sufficiently hygroscopic to attract the water necessary

for the reaction if other properties are also favorable,

(3) surface electrical-resistance measurements confirm

the hygroscopicity determinations; however, free ions in

glasses may have considerably more effect on the surface resistance of certain glasses than do their hygroscopic properties, and (4) the uneven distribution of migratable ions between the aggregate surface and the

outer phase offers a mechanism for the osmotic swelling

of individual aggregate grains, with accompanying expansion in concrete members. 6 p. RP2781. Insulated loop antenna immersed in a con- ducting medium, J. R. Wait A solution is given for the fields of a circular loop in a conducting medium. The loop is assumed to have a uni- form current, and it is enclosed by a spherical insulating

cavity. The impedance of the loop is also considered. It

is shown that the power radiated from the loop varies approximately as the reciprocal of the radius of the

cavity for a specified loop current. Furthermore, if the

cavity is electrically small, relative to the external medium,

the radiation field is not significantly affected by the

presence of the cavity. 5 p. RP2782. Noncrystal ionic model for silica glass, L. W.

Tilton A model was constructed of pentagonal rings of symmetrical tetrahedra so connected that all five silicons lie in one plane and all angles Si—O—Si approximate 180°. From an initial tetrahedron the rings extend in six directions to include its six edges, and in the resulting three- dimensionable network each ring forms a common inter- face between dodecahedral cages which necessarily have

fivefold symmetry. Such symmetry is incompatible

with formation of *a crystal lattice and thus the structure can be extended in three dimensions only to a very limited

degree and with unavoidable stress and distortional

strain. A stressed network cluster of such dodecahedral

cages is here called a vitron.

If the scale in this model for silica glass is taken as 1.6 A, from silicon to oxygen, the model is found to be in accord

with other radial distances computed from diffraction data and the density is correct within 10 percent. The apertures of the pentagonal interfaces are of suitable size to explain data on the diffusion of noble gases through silica.

Shared penta faces and intermittent oxygen bridges connect neighboring vitrons and constitute an interstitial tissue of relatively weakened structure that accounts for the observed low tensile strengths of silica glass and provide channels for viscous flow. The proposed cages would be less pliable at low temperatures and so the interstitial tissues between vitrons should expand in volume on cooling. This "negative" expansion would counter the normal expansion and

account for the known extremely small (net) expansivity

of silica glass. The accompanying changes in strength and volume of the glass at its weakest places, the interstitial tissues, can account for a number of known "anomalies" in thermal behavior of silica glass with respect to

its volume, compressibility, elastic moduli, and viscous

flow. The vitron concept reconciles the crystallite and the network theories of glass by proposing nuclei that cannot grow extensively and a distribution of localized stresses that may constitute an acceptable degree of randomness and provide effective modulations in continuity. This

concept of definite but limited microregularity in structure suggests that other noncrystal symmetries should be

studied for possible interest in other fields such as liquids and high polymers. 16 p. RP2783. A computation of cyclic cubic units, H. Cohn and

S. Gorn The paper is a report on a tabulation of units performed on the EDVAC at the U.S. Army Proving Grounds in Aberdeen, Maryland. The algebraic number fields in- volved were 45 cyclic cubic fields of discriminant I 2

, where I is one of the primes of form 3m +1 from 7 through

499. The object of the search was the discovery of units through a specific method, an algorithm based on Minkowski's geometric number theory but particularly amenable to a stored-program computer. In the computation, combined use was made of integral arithmetic and decimal arithmetic but with careful error analysis. 14 p. RP2784. Estimation of the frequencies of thin elastic plates with free edges, T. Kato, H. Fujita, Y. Nakata, and M. Newman A variational method is proposed for calculating the

frequencies of thin elastic plates with free edges, with

rigorous error estimates. As a numerical example, the fundamental frequency of a square plate with the Poisson

ratio 0.225 is calculated with a satisfactory result, the

possible relative error being less than 1/2000. Generalization to more complicated boundary conditions is straightforward. 18 p. RP2785. A thermochemical study of the reaction of calcium hydroxide, silica gel, and water,

E. S. Newman

The heat of reaction of calcium hydroxide, silica gel, and water was measured by a heat-of-solution method. The reaction was carried out at 25° C in pastes having a water solid ratio of about 1.0. The heat of reaction, — AH at 25° C, for the reaction Ca(OH) 2 + Si02 nH2 0 = CaO-Si02 -nH2 0

was found to be about 10.3 kilocalories. The heat of the

reaction CaO-Si02 -nH2 0 + mCa(OH) 2 = ( 1 + m) CaO-Si02

- (n + m) H2 0

is about 1.6 kilocalories per mole of added Ca(OH) 2 . About

half of the total measured heat of reaction represents the heat of wetting of the reaction products. Differential thermal analyses and drying experiments indicated that 3CaO-2Si02 -2H2 0 was formed in some of the pastes. 10 p. 13
RP2786. On some expansions for Bessel integral functions,

F. Oberhettinger

Investigations by van der Pol and Humbert concerning

the Bessel integral function of order zero are extended

to Bessel functions of other kinds and to functions related to Bessel functions. 5 p. RP2787. Table of the first moment of ranked extremes,

J. Lieblein and H. E. Salzer Let a sample of n independent random values from the extreme-value distribution, with c.d.f. $(?/) =exp( —

-

"), be arranged in decreasing order and denoted by yh 1/2,

. . ., ym, . . ., y n. The table gives the expected values

for all these order statistics for sample size not exceeding

25. For the larger samples, up to n=100, the expected

values are given only for the first 26 largest values. 4 p. RP2788. An approximate expression for gamma-ray

degradation spectra, U. Fano and A. T. Nelms The equation for gamma-ray degradation spectra is reduced to a form suitable for a simple approximation. The approximation is valid in a wavelength range between two Compton wavelengths larger than the wavelength

of the source and the region where photoelectric absorption becomes very intense; this range is wide for low Z

materials. Input data are provided for application to various materials and source energies. The results of sample calculations are shown and compared with those obtained by standard numerical calculation. 4 p. RP2789. Some infrared bands of deuterium sulfide, H. C.

Allen, Jr., E. K. Plyler, and L. R. Blaine Two regions of the D2 S spectrum have been observed,

5 and 3.6 ^. An analysis of the absorption in the 3.6 n

region attributes it to two overlapping bands with excited

states (vl ,ifi,vs ) = (1,1,0) and (0,1,1). The band center of the (0,1,1) band is found to be some 50 cm-1 lower than

the previously accepted value while the (1,1,0) band center is found some 60 cm-1 higher than the previous deter- mination. The absorption near 5 m seems to arise from

the (0,0,1) band centered near 1906 cm-1

. Overlapping

atmospheric absorption makes a detailed analysis impossible at this time. This band center is almost 100 cm-1 lower than previously reported. The excited state constants for the two bands near 3.6 n are

(1,1,0) 1-0=2742.77 A* = 5.478 B* = 4.512 C* = 2.395

(0,1,1) x0 =2754.44 A*=5.531 J5* = 4.521 C* = 2.405. 4 p. RP2790. Some effects of low temperatures and notch depth

on the mechanical behavior of an annealed commercially pure titanium, G. W. Geil and

N. L. Carwile Unnotched and notched specimens (60° notch angle, 0.05-inch root radius and various notch depths) of an

annealed commercially pure titanium were slowly strained

to fracture in tension at +150° or +100° to —196° C,

to reveal the combined effects of temperature and notch geometry on the tensile behavior of the metal. Impact

tests were made on Charpy V-notch specimens at +300°

to —196° C for a determination of the impact notch- toughness of the titanium. True stress-true strain rela- tions were determined for the titanium in tension and a study was made of the effects of test temperature, stress system, and interstitial content on the mechanism of defor- mation and work-hardening characteristics of the metal.

12 p. RP2791. Determination and use of the sag point as a

reference point in the heating of glasses, S. Spinner, G. W. Cleek, and E. H. Hamilton

Glasses, when heated, undergo a gradual continuous change from solids to liquids over a rather wide temperature range. As a consequence, it has been found neces- sary to define certain temperature reference points in this transition range so that different glasses may be compared

with each other. These points are chosen to correspond

to established stages in the annealing or forming process. A new reference point, designated as the sag point, is described. The experimental determination of this point

is rapid and simple. Also, it gives useful information concerning the annealing temperatures and ease of formation of glasses of widely varying compositions. The sag point is defined as the temperature at which a glass fiber 0.5 to 0.8 millimeter in diameter, horizontally supported at J^-inch intervals, will sag under its own

weight in 25 ±5minutes. 5 p. RP2792. Formulas for inverse osculatory interpolation in the complex plane, H. E. Salzer Improved formulas for inverse osculatory interpolation

in the complex plane are obtained by inversion of Hermite's formula and the use of appropriate grid point configurations. They cover the cases for n = 2(l)7, where n is the number of points required in direct osculatory interpolation. The formulas provide an improved means for inverse interpolation in the complex plane where the first derivative is either tabulated alongside the function or is easily obtained. 6 p. RP2793. An x-ray study of textural stresses in two-phase

alloys, C. J. Newton and H. C. Vacher

Internal or residual stresses of the textural stress class are discussed, with special attention to that type resulting from a difference in thermal expansion of two phases

present in an alloy. X-ray stress measurements were made on various brasses and steels, and the results were found to be in reasonable agreement with the quantitative theory of F. Laszl6. 5 p. RP2794. Dissociation of 4-chloro-4'-aminodiphenylsulfone, E. E. Sager and F. C. Byers The ultraviolet absorption spectra of 4-chloro-4'-amino- diphenylsulfone has been determined. The dissociation may be considered as the acidic dissociation of the ammonium ion which is formed with the addition to the base of hydrogen ion from an acid such as hydrochloric acid. Spectrophotometric measurements of several concentrations of 4-chloro-4'-aminodiphenylsulfone at various known

hydrogen-ion concentrations were made at 25° C, from which the values pKc , based upon the concentrations, were

determined. From these, the value of pKa was derived. At 25° C, pK„ is 1.38, which corresponds to a value of 0.042 mole per liter for Ka . The activity coefficient terms may be expressed simply as a linear function of the ionic strength. Spectrophotometric measurements were also made at 15°, 20°, 25°, 30°, and 35° C on certain solutions

in order to calculate the heat of dissociation. It was

found to be 21,000 joules deg-1 mole-1

. The basic dissoci- ation constant, Kb, is 2.4X 10-'3

, or pKb is 12.62. 4 p. RP2795. Speed of sound in water by a direct method, M. Greenspan and C. E. Tschiegg The speed of sound in distilled water was measured

over the temperature range 0° to 100° C with an accuracy

of 1 part in 30,000. The results are given as a fifth-degree polynomial and in tables. The water was contained in a

cylindrical tank of fixed length, terminated at each end by

a plane transducer, and the end-to-end time of flight of a

pulse of sound was determined from a measurement of the

pulse-repetition frequency required to set the successive echoes into time coincidence. 6 p. RP2796. Pattern of a flush-mounted microwave antenna,

J. R. Wait The numerical results for the far zone radiation from an

axial slot on a circular cylinder of perfect conductivity and

infinite length are discussed. It is shown that the results 14
or large diameter cylinders can be expressed in a universal orm that is suitable for pattern calculations for arrays of

' ilots on a gently curved surface. The work is compared

vith a related diffraction problem considered by Fock.

,>P- RP2797. Standards for pH measurements from 60° to 95° C, V. E. Bower and R. G. Bates The NBS standard pH scale is defined in terms of several

•eference solutions whose pH values (pH,) have heretofore

)een assigned only in the range 0° to 60° C. Recent

measurements of the standard potential of the silver

;ilver-chloride electrode at temperatures above 60° now

oermit this scale to be extended to 95° C. Electromotive-force measurements of cells with hydrogen and silver—silver-chloride electrodes and containing

Duffer-chloride solutions are reported in this paper for the

range 60° to 95° C. The assignment of pH. values to the

following five reference solutions is described: 0.05-m

potassium tetroxalate ; potassium hydrogen tartrate (saturated at 25° C) ; 0.05-m potassium hydrogen phthalate; 0.025- m potassium dihydrogen phosphate; 0.025-m

disodium hydrogen phosphate; and 0.01-m borax. 4 p. RP2798. A numerical study of Dedekind's cubic class number formula, H. Cohn

In this paper an analytic formula of Dedekind is used to compute class numbers for a sample of pure cubic fields, employing the National Bureau of Standards electronic computer, the SEAC. The computation is one of major

magnitude, and it illustrates the usefulness of combining

integral and decimal arithmetic. The class numbers obtained are of much greater magnitude than those of pure

cubic fields previously studied by means of hand computer

methods. 7 p. RP2799. Impact properties of slack-quenched alloy steels, M. R. Meyerson and S. J. Rosenberg A method was developed for slack quenching impact

specimens so as to produce uniform and accurately controlled hardnesses and microstructures at any location in the cross section. Steels of the 81xx type, without and

with boron, and varying in hardenability, were studied to evaluate the effect of slack quenching upon the impact

properties. Slack quenching was shown to be detrimental to the impact properties of the steels. The injurious effects were

found to be dependent on the carbon and alloy content of the steels, the degree of slack quenching, and the amount

of tempering. When any two steels were slack quenched to the same

hardness, the higher carbon lower alloy steel had impact

properties inferior to those of the lower carbon higher

alloy steel. Tempering usually improved the properties

of both and reduced the differences between them. The higher the hardness to which any steel was slack quenched, the lower were its impact properties. When

tempered to the same hardness, however, the steel origi- nally slack quenched to the higher hardness had the better impact properties. 16 p. RP2800. Synthesis of Cl4-labeled L-sorbose and L-ascorbic

acid, H. L. Frush and H. S. Isbell A method is presented for preparing Cl4-labeled L-ascorbic acid (vitamin C) from labeled barium D-gluconate or

D-glucose. The process is adapted from the commercial

synthesis of vitamin C through sorbitol, L-sorbose and

potassium di-0-isopropylidene-2-fce«o-L-gulonate. In the cyanohydrin synthesis of labeled D-glucose, barium

D-gluconate is used as an intermediate. For preparing

labeled L-ascorbic acid, the gluconate is converted to the

lactone. This is efficiently reduced, by means of sodium

borohydride, directly to sorbitol, obviating the inter- mediate preparation of D-glucose.

If labeled D-glucose is more readily available than the

corresponding gluconic acid (as for instance D-glucose-6-C 14

or randomly labeled D-glucose), the sugar is reduced to

sorbitol by the sodium borohydride method; the yield is nearly quantitative. In a preparation of L-ascorbic acid-6-C 14 from barium

D-gluconate-l-C14 the yield was 41.5 percent, based on

the gluconate, or 67.8 percent, based on the intermediate

L-sorbose. A mixture of Methyl Cellosolve, ethylene

dichloride, and hydrogen chloride was found to be effective

in converting potassium di-0-isopropylidene-2-fce<o-L-gulo- nate to L-ascorbic acid. 4 p. RP2801. A determination of the gamma-ray emission of radium, F. H. Attix and V. H. Ritz Measurements of the 7-ray emission of radium (roent- gens per milligram-hour at 1 centimeter) have been made

by means of a graphite cavity ionization chamber. An

auxiliary experimental examination of the stopping-power

correction for the non-air-equivalence of the cavity wall

is also described. The resulting average value for the 7-ray

emission of radium (enclosed in an 0.5-millimeter platinum

capsule) is 8.26 ±0.05 roentgens per milligram-hour at 1 centimeter, which is based upon the conclusion that the stopping-power data of Bakker and Segre are consistent with the results of the auxiliary experiment. 13 p. RP2802. Radiation from slots on dielectric-clad and cor- rugated cylinders, J. R. Wait and A. M.

Conda An approximate formula is derived for the radiation pattern of an axially slotted cylinder with a thin dielectric coating. The accuracy of the formula is shown to be suffi- cient for practical purposes. Using a similar method, the

pattern function for a slot on a corrugated cylinder is derived. Extensive numerical results are presented for both dielectric-clad and corrugated cylinders. 10 p. RP2803. Infrared emission spectrum of methane at 3.3 microns, E. K. Plyler and L. R. Blaine The emission spectrum of methane from the flame of a Bunsen burner has been observed in the region from 2,820

to 3,180 cm-1

. Many lines have been measured in the

P-, Q-, and ^-branches. The P-branch was observed to P-28 and the R-branch to R-17. The spectrum was observed from the inner cone of the flame and with a rich fuel mixture the P-12 line was most

intense. This intensity distribution indicated a temperature of about 1,200° K for the heated gas. 2 p. RP2804. Term analysis of the first spectrum of rhenium

(Re 1), P. F. A. Klinkenberg, W. F. Meggers,

R. Velasco, and M. A. Catalan With the aid of new data on wavelengths, intensities, and the Zeeman effect, the structural analysis of the first spectrum of rhenium (Re 1) has been extended to include

2,764 lines that are explained as transitions among 282

atomic energy levels. This analysis accounts for 90

percent of the total observed intensity, although only 64

percent of the total number of lines has been classified. From the Zeeman effect, magnetic splitting factors have

been derived for 75 percent of the levels, and nearly 40

percent of these have been grouped into designated spectral terms ascribed to specific configurations of electrons. The

normal state of neutral Re atoms is 5d* 6s2 6 S2 « and the

ionization limit is approximately 63530 kaysers or 7.87

electron volts. 30 p. RP2805. An apparatus for measurement of thermal conductivity of solids at low temperatures, R. L. Powell, W. M. Rogers, and D. O. Coffin A description is given of an apparatus used for deter- mining the thermal conductivities of solids in the temperature range 4° K to 300° K. The apparatus is especially suited to the determination of thermal conductivity over

a large temperature interval, enabling coverage of the

15
temperatures between the normal boiling points of liquefied gases. Illustrative results are given for an insulator, polytetrafluoroethylene, and for a high-conductivity commercial coalesced copper. The thermal conductivity of the

insulator increases monotonically from 0.56 milliwatt per centimeter per degree K at 5° K, to 2.32 at 80° K. The

thermal conductivity of the copper has a maximum of 24.9 watts per centimeter per degree K at 21° K, and a value of 8.15 at 5° K. The methods of data analysis and

estimation of errors are given. 7 p. RP2806. Some factors affecting the surface area of hydrated portland cement as determined by

water-vapor and nitrogen adsorption, L. A. Tomes, C. M. Hunt, and R. L. Blaine Brunauer-Emmett-Teller (BET) surface areas of hydrated portland cement have been calculated from water- vapor and nitrogen-adsorption data. The adsorption and

desorption of water vapor caused measurable decreases in

specific surface areas by both water-vapor and nitrogen

adsorption. Changes were also produced by wetting and

drying. The adsorption and desorption of nitrogen at the

boiling point of liquid nitrogen did not produce similar

effects. The specific surface and nonevaporable-water content of a hydrated cement are also somewhat dependent on the

initial drying treatment. The effect of measuring water- vapor surface and nonevaporable water with specimens

dried for different periods of time is also considered. 8 p RP2807. Excitation of surface waves on conducting,

stratified, dielectric-clad, and corrugated surfaces, J. R. Wait An expression for the field of an electric dipole located over a flat surface with a specified surface impedance Z is derived from the formal integral solution by a modified

saddle-pcint method. Using the value of Z appropriate

for a homogeneous conducting ground, the general ex- pressions reduce to those given by Norton. In this case the phase of Z lies between 0 and 45°. When the phase

exceeds 45°, as it may for a stratified ground, the radiated wave of the dipole becomes partially trapped to the interface. This effect is most pronounced for an inductive sur- face where the phase of Z is 90°, in which case the energy

of the wave is confined within a small distance from the

surface. Such inductive surfaces are a metallic plane with a thin dielectric film or a corrugated surface. This unifying treatment provides a link between the sur- face waves of Zenneck, Sommerfeld, Norton, and Goubau,

and indicates that the phase angle of Z controls the extent

to which these waves may exist for a dipole excitation. 13 p. RP2808. Cunife wire magnets of small size, I. L. Cooter and R. E. Mundy

A ductile permanent-magnet alloy, having a composition

of 60 percent of copper, 20 percent of nickel, and 20 per- cent of iron, was cold-drawn from wire, 25 mils in diameter

to 5 mils in diameter. Demagnetization curves were obtained for several sizes of the wire in the cold-drawn state. These wires were then given a heat treatment and again demagnetization curves were obtained. Values of coercivity, retentivity, and maximum energy product are compared for various wire diameters. Although the magnetic

properties were adversely affected by the cold-working, they were substantially improved by the heat treatment.

4 p. RP2809. Interpretation of mass spectra of condensates from urban atmospheres, E. R. Weaver, E. E. Hughes, S. M. Gunther, S. Schuhmann, N. T. Redfearn, and R. Gorden, Jr. A method of interpreting the mass spectra of the very complex mixtures of substances that condense from an

urban atmosphere at the temperature of liquid oxygen is

described. The number of individual chemical compounds i in such a mixture is greatly in excess of the number of 1 masses recorded, and it is accordingly impossible to identify all the compounds present. However, the significant ' sources of pollutants are much less numerous, and if the products from each source are of substantially constant composition it is possible to obtain a representative pat- tern of each and to proceed thereafter to make a fairly good estimate of the character and amount of pollutants

in terms of their sources. The greatest simplification is made by treating the gases associated with motor traffic as a unit. 22 p. RP2810. Infrared emission spectrum of silicon carbide heating elements, J. E. Stewart and J. C. Richmond A method for determining the spectral emittance of a

silicon carbide heating element (Globar) was devised and

data were obtained over the wavelength range 1.25 to ; 15.25 fi for four different temperatures. The spectral emittance at all four temperatures, 482°, 649°, 816°, and

982° C (900°, 1,200°, 1,500°, and 1,800° F), was found to be approximately constant except for a gradual rise in emittance from 1.25 to about 4 n and two minimums in the curves at longer wavelengths. The first of these mini- mums, which occurred at about 9 n, was ascribed to minor amounts of Si02 present on the surface of the silicon car- bide heating element, whereas the second at about 12.5 ft corresponds to one of the strong Raman lines for SiC.

5 p. RP2811. Increased chemical reactivity of the surface compared with that in the bulk volume of Britton- Robinson universal buffers, R. G. Pike and D. Hubbard A direct comparison of the chemical reactivity at the

surface with that in the bulk volume of buffer solutions over the range pH 7 to pH 11.8 was made, using Corning 015 glass as the indicator. By observing interferometrically the surface alterations of optically flat specimens brought about by exposures to aqueous buffer solutions under controlled conditions of time, temperature, and pH

it was possible to evaluate, at least semiquantitatively, the

difference between the chemical reactivity of the surface and the bulk volume of the solutions. For the buffer at pH 7 the surface reactivity appeared to correspond to a hydrogen ion activity of pH 9.4. The apparent concentration differential between the surface and bulk volume

falls off sharply for buffers of increased pH, amounting to only 0.2 pH unit for the buffer at pH 11.0, and becomes

nondetectable at pH 11.8. Unfortunately the chemical

durability characteristics of the glass were such that no

differentiation could be made between the hydrogen ion

activity of the surface and the bulk volume in solutions more acid than pH 7. 4 p. RP2812. Photometric determination of tungsten in steel and titanium alloys with dithiol, L. A. Machlan and J. L. Hague A method is described for the direct photometric de- termination of tungsten in steels. The sample, 0.1 to 0.2 g in weight, is dissolved in aqua regia, and a sulfuric- phosphoric-perchloric acid mixture is added. The solution

is evaporated to fumes of sulfuric acid and diluted to volume with diluted sulfuric acid (1 + 3). An aliquot portion of the solution is treated with dithiol in diluted

sulfuric acid solution (1 + 3) containing sulfur di xide, and molybdenum and certain other potential interferences are removed by extraction with chloroform. Copper and

other elements forming insoluble dithiolates are removed

by filtration. The tungsten-dithiol complex is then formed,

after the addition of hydrochloric acid, stannous chloride, and dithiol, and extracted with butyl acetate. The

absorbancy of the tungsten complex is determined at approximately 635 m/i. An accuracy of 0.005 percent of tungsten, or better, is indicated in the range 0.05 to 0.50 16
percent of tungsten, and of about 0.001 percent for amounts

of less than 0.05 percent of tungsten. The application of the method to titanium alloys is described in an appendix

section. 6 p. RP2S13. On the most general form of the compatibility equations and the conditions of integrability

of strain rate and strain, E. H. Brown

The most general forms of the equations of compatibility are derived by a very simple analysis in terms of

the material strain rate tensor and the rate of change of the Riemann-Christoffel curvature tensor during the deformations. It is shown that recent statements on the

significance of the compatibility equations, essentially

that their satisfaction is equivalent to the condition that

the space be locally Euclidean, are misinterpretations based on restricted forms of the equations. In addition,

a new form of the conditions of integrability of strain is derived in terms of the rate of change of the curvature

tensor. 6 p. RP2814. An apparatus for measuring the piezoresistivity

of semiconductors, R. F. Potter and W. J. McKean

A detailed description is given of an apparatus and

procedure designed to measure the piezoresistive effect in semiconductors over an extended temperature range. A

tensile force up to 1 kilogram can be applied to the sample by means of a calibrated beam balance. The apparatus

has been used for measurements on indium antimonide

over the range 78° K to 300° K, and tensile stresses of the order of 5X107 dynes per square centimeter can be

applied to samples that are cut in a special manner. 4 p. TITLE PAGE AND CONTENTS TO VOLUME 59. 4 p. RESEARCH PAPERS FROM JOURNAL OF RESEARCH OF THE

NATIONAL BUREAU OF STANDARDS, VOLUME 00, JANU- ARY—JUNE 1958 RP2815. The condition of certain matrices, III, J. Todd

The condition-numbers of certain matrices associated with various discretizations of the two-dimensional Laplacian operator are estimated. The condition-number

gives an estimate of the error obtained by solving the corresponding svstems of simultaneous linear equations.

7 p. RP2816. Infrared study of some structural changes in natural rubber during vulcanization, F. J. Linnig and J. E. Stewart A knowledge of the structure of vulcanized rubber is essential to the interpretation of vulcanization and oxi- dation studies and the physical properties of the material. In the present work an infrared study has been made of structures resulting from a number of different methods of vulcanization. Sulfur vulcanizates show the presence of a shifted double bond, originally observed by Sheppard

and Sutherland. The presence of conjugated double bonds is also indicated. Accelerators such as tetramethyl- thiuram disulfide and zinc dibutyl dithiocarbamate

increase the rate of the double-bond shift and reduce the amount of conjugated double bonds. Neither the double- bond shift nor conjugation is observed as a result of vulcanization with tetramethylthiuram disulfide alone, hydrogen sulfide and sulfur dioxide (Peachey process), a peroxide, or gamma rays. These result in a possible decrease in carbonyl structures, and in the case of the

last three, possible increased absorption due to OH and

ionized carboxyl groups. Apparently, the double-bond shift and conjugation are primarily phenomena related to the use of elemental

sulfur. The other vulcanization systems studied evidently

involve different mechanisms. An implication of the

present work is that there may be a relationship between

the reported ease of oxidation of sulfur vulcanizates, ac- celerated vulcanizates, and sulfurless vulcanizates (tetramethylthiuram disulfide alone), which decreases in the

order named, and the probable amount of conjugation

in the compound, which decreases in the same order. 13 p. RP2817. Crystal structure of barium hydrogen ortho- phosphate, G. Burley The structure of anhydrous BaHP04 was determined from three Fourier projections. The unit cell is ortho- rhombic with the space group Pn2,a—No. 33. The cell dimensions are a= 14.12, 6=17.15, and c = 4.59 A, and it contains twelve formula units. Each Ba atom has a

coordination polyhedron of ten oxygen atoms, being bonded to four phosphate tetrahedra by edge sharing and

to two more by corner sharing of oxygen atoms. The

phosphate groups are in separate tetrahedra, linked by

hydrogen bonding to form continuous chains. 5 p. RP2818. A study of sampling of flame gases, C. Halpern and F. W. Ruegg A study of sampling of hot combustion gases by means

of water-cooled probes of internal diameter of 0.027 to 0.070 cm has been made. Effect of conditions of sampling on concentrations of CO, C02 , H2 , and H2 0 was the primary interest in this study. The probes were unable

to quench reactions completely and were unable to preserve the original composition of the gas, but small probes were more effective than larger probes. Sample composition was unaffected by sampling velocity, except that at the

higher rates of sampling it appears that gradients of composition and temperature caused the effectiveness of quenching to decrease. Probe material and configuration had little effect on sample composition. 9 p. RP2819. Pyrolysis of polyamides, S. Straus and L. A. Wall Thermal decompositions of various nylon samples having different molecular weights and composition were

investigated by several procedures: (1) The rate of volatil- ization at temperatures between 310° and 380° C; (2) the analysis of the volatile products by mass spectrometry; and (3) a direct measurement of volatilizing material obtained by carrying out the pyrolysis within the ionization chamber of a mass spectrometer. Activation energies based on the rates of volatilization

for the various samples varied from 15 to 42 kilocalories. The rate behavior, i.e., the observation of maxima in the

rate-versus-conversion plots, is close to that given by

theory for random decomposition. The different activation energies appear to be the result of a hydrolytic mechanism which is sensitive to trace polymerization catalysts. Increases in rates were obtained when sulfuric and phosphoric acids were added to nylon. The fluctuations found

in activation energies, and the production of C02 indicates that a hydrolytic decomposition mechanism may be

contributing to the over-all process. It appears evident

that, compared to a pure hydrocarbon chain, the poly- amides are much more susceptible to thermal decomposition. 7 p. RP2820. Some thermodynamic properties of the systems

polybutadiene-benzene and polyisobutene- benzene, R. S. Jessup Experimental data are reported on densities at 26.9° C

of solutions of polyisobutene in benzene covering the composition range from 0 to 10 percent by weight of polyisobutene, and on relative vapor pressures of solutions

of polybutadiene and of polyisobutene in benzene covering

the range from 0 to 50 percent of benzene. Values of apparent specific volume of polyisobutene in benzene

were calculated from the densities of solvent and solutions. The results of the vapor pressure measurements were compared with the Flory-Huggins equation. The deviations from this equation for the polyisobutene-benzene svstem are much greater than for the polybutadiene- benzene system. The following equations represent the 17
activities ot the solvent for the polybutadiene-benzene and polyisobutene-benzene systems, respectively.

In ffl!=ln v^Vt+OMvl+O.OGvl,

In a1 =ln v } + (l--) v 2 + 0.50vl + 0.388vl + 0.184i>l\ where ax represents activity of the solvent, v\ and v2 are volume fractions of solvent and polymer, respectively, and m is the ratio of molal volumes of polvmer and solvent.

7 p. RP2821. Infrared measurements with a small grating from 100 to 300 microns, E. K. Plvler and

L. R. Blaine Good resolution has been obtained with a small grating

in the region from 100 to 300 microns. A high-pressure mercury lamp, having a quartz inner envelope, was used

as a source and a Golay cell as a detector. The radiation was reflected from three filtering plates before passing through the entrance slit. This filtering served to reduce

the stray radiation to about 5 percent. 3 p. RP2822. A low-frequency annular-slot antenna, J. R. Wait The radiation characteristics of an annular slot cut in an ideally conducting ground plane are discussed. The

voltage impressed between the concentric edges is assumed

to be constant around the slot. The annular slot is backed by a hemispherical cavity which has imperfectly conducting

walls. For a specified voltage, the power radiated in the upper half-space and the power absorbed by the hemispherical cavitv are calculated. It is indicated that the power

absorbed can be reduced greatly by lining the walls of the cavity with a wire mesh. A flush-mounted antenna

of this type at low frequencies may have certain practical advantages over the more conventional monopole. 6 p. RP2823. Relation between the absorption spectra and the chemical constitution of dyes: XXIX. Inter- action of direct azo dyes in aqueous solution, M. N. Inscoe, J. H. Gould, M. E. Corning, and W. R. Brode

Interaction of dyes in aqueous solution results in differences in the spectrum of the mixture when compared

with the sum of the spectra of the individual dyes. A

general survey, chiefly with azo dyes, was made to de- termine the effect of dye structure on this interaction. The effect of other factors on the interaction of direct azo dyes was investigated. The addition of alcohol or non-ionic detergent prevents this interaction, while the presence of inorganic salts or an increase in dye concentration appears to increase the extent of interaction. The effect of acids and bases is dependent upon the nature

of the dyes in the mixture. The results obtained are consistent with the assumption

that the forces involved in the interaction of direct azo dyes in mixtures are the same as those causing the ag- gregation of individual dyes and those binding these dyes

to fibers. 19 p. RP2824. Energy spectra of cascade electrons and photons,

C. A. Olson and L. V. Spencer The equations for the energy spectra of electrons and

photons in a cascade shower are written in a form suitable

for numerical applications with accurate cross sections. Trial calculations were carried out to check the feasibility of a step-by-step numerical integration procedure similar to that used successfully at low energies in noncascade

problems. Numerical results were obtained for lead by

using a monoenergetic source of electrons at 360 mc! and

extreme relativistic cross-sectional forms, which assume

complete screening. The method was designed to permit

the determination of cascade-shower spectra, spatial

distributions, and directional distributions that are exact

in the sense that the main limiting factor is the accuracy with which the cross sections are known. The numerical

results of the trial calculations were found to agree with previously published results based on more restrictive methods of analysis. 12 p. RP2825. Observer differences in color-mixture functions studied by means of a pair of metameric grays K. L. Kelly The Granville metameric gray panels have served to characterize the color vision of observers in an approximate but useful way. Thus, the 39 observers studied, and the four color-mixture functions were classed into five groups according to their indicated amounts of ocular pigmentation. These panels were also used to measure the correla- tion of lens and macular pigmentations with observer

age, sex, and eye and hair colors. Of the three sets of color-mixture functions intended to refer to 2° field observation, the 1931 Commission Internationale de L'Eclairage standard observer agrees best. These data thus afford no basis for supplanting the 1931 Commission

Internationale de L'Eclairage standard observer with

either the Judd "i" or the 1955 Stiles' 2° color-mixture

functions. The 1955 Stiles' 10° functions, however,

agree fairly well. 7 p. RP2826. Precise evaluation of surface area with indirectly calculated dead space, W. V. Loebenstein The determination of surface area from nitrogen adsorption data obtained at low temperature by volu- metric methods is subject to several errors. One error that becomes especially serious when the surface area is small is associated with the calibration of the dead space with helium. This error is large because the volume of ad- sorbed gas is calculated as a small difference between two

comparatively large quantities. A statistical method of successive approximations has been developed for calculating the dead space. The latter

is obtained as that quantity necessary to yield the best agreement with the known isotherm equation. This procedure fixes the value of Vm (directly proportional to the surface area) . The procedure also provides an estimate

of the experimental error associated with the over-all determination. 4 p. RP2827. Sample calculations of gamma-ray penetration

into shelters: Contributions of sky shine and

roof contamination, M. J. Berger and J. C. Lamkin An approximate method is presented for calculating the penetration of gamma radiation in shelters. Sample

calculations, for an assumed source energy of 1 million electron volts, are given for the following problems:

(1) Dose rate inside houses and underground shelters whose roofs are covered with radioactive fallout, and

(2) dose rate in open holes due to reflected radiation (sky

shine) from fallout contamination on the surrounding

ground. A detailed examination is made of the de- pendence of the dose rate in a shelter on the shape of the

shelter, and on the position of the detector within the

shelter. The estimated accuracy of the calculations

is ± 30 percent. 8 p. RP2828. Heat content of sodium borohydride and of potassium borohydride from 6 to 400° C,

T. B. Douglas and A. W. Harman

The heat content of sodium borohydride, NaBH4 , and

of potassium borohydride, KBH4 , was measured, relative

to that at 0° C, at 50-degree intervals from 0° to 400° C. The so-called "drop" method was used with a precision Bunsen ice calorimeter and a silver core furnace. Pre- liminary tests showed that spontaneous decomposition of these compounds is very slow at temperatures up to 400° C. Measurements were made on two samples of each compound, those of sodium borohydride having been obtained

18
from different sources. Smoothed values of the heat- content function, heat capacity, entropy, and the Gibbs

free-energy function were derived from the data. These

values were increased by 0.5 percent to correct for the

presence of an estimated 1 percent of the corresponding

inelaborate in each sample. The heat capacity of sodium

borohydride increases monotonically with temperature in the range investigated; that of potassium borohydride

passes through a point of inflection, which suggests that

there may be a broad second-order transition in the neigh- borhood of room temperature. 8 p. RP2829. Infrared spectra of crystalline polyphenyls,

J. E. Stewart and M. tiellmann

Infrared absorption spectra of sixteen selected poly- phenyls ranging from biphenyl to m-octaphenyl are pre- sented for the 5- to 38-micron region. The observed

vibration bands are discussed in terms of a pseudo-symmetry approximation in which the individual rings are assumed to vibrate separately. Indications of interactions between rings are seen in the C-H out-of-plane bending

vibrations of ortho- and meta-substituted rings. Evidence

is given for the existence of two rotational isomers of mquatraphenyl with a free energy difference of about 250

calories per mole. 12 p. RP2830. On the application of steam-driven water jets for propulsion purposes, J. M. Burgers and A. Ghaffari

Calculations have been made concerning the momentum

that can be given to a jet of water by mixing it with a jet of high-speed steam. Apart from an application of the equations of momentum and enthalpy, this raises questions concerning the speed of condensation and the acceleration

of the water. 5 p. RP2831. Mas? spectra and relative sensitivities of some

polyphenyls, P. Bradt and F. L. Mohler Mass spectra have been measured by evaporating poly- phenyls from a tube furnace into the ionization chamber of

a 60° mass spectrometer operated at constant ion acceler- ating voltage. Mass spectra of pure tetraphenyl, hexaphenyl, and octaphenyl are reported. A synthetic mixture of terphenyl, tetraphenyl, pentaphenyl, hexaphenyl, and octaphenyl in known proportions was evaporated as the temperature was increased step by step from

125° to 290° C and time integrals of the five molecule ion currents were recorded over the time required to completely

evaporate the sample. The relative sensitivity increases rapidly with increasing molecular weight. 3 p. RP2832. Infrared spectra of thermally degraded poly

(vinyl chloride), R. R. Stromberg, S. Straus, and B. G. Achhammer

The changes in chemical structure occurring in poly

(vinyl chloride) as a result of heating in a vacuum in the range 100° to 400° C were studied using infrared spectrophotometry. The principal changes occurring in the residue during pyrolysis in a vacuum were the formation of unsaturated structures and a change from an aliphatic spectrum to one showing aromatic absorption. The data

are used to support a previously proposed mechanism of decomposition for poly (vinyl chloride). 6 p. RP2833. Current and potential relations for the cathodic

protection of steel in salt water, W. J. Schwerdtfeger A laboratory investigation was made pertaining to the

cathodic protection of steel specimens that were exposed

for 60 days to both stagnant and aerated city water, to which was added 3 percent by weight of sodium chloride. Major consideration was given to the significance of potential as a criterion for protection. Optimum protection was achieved when specimens were controlled at

— 0.77 volt with reference to the saturated calomel half cell. Although a good degree of protection was obtained at controlled potentials more noble than —0.77 volt, that is, at the potentials associated with the breaks in cathodic

polarization curves, this lesser degree of protection could not be obtained at lower mean current densities. 7 p. RP2834. Joule-Thomson process in the liquefaction of helium, E. H. Brown and J. W. Dean A dimensionless, normalized, correlating function is introduced for the specific enthalpy of helium. Using

this function, the consistency of various enthalpy data is determined. These data are then used to obtain curves

of helium liquefaction yield in the region of variable

specific heat in terms of heat-exchanger efficiency. 8 p. RP2835. Changes in the properties of an asphalt during

the blowing operation, L. R. Kleinschmidt and

H. R. Snoke The physical characteristics and component distribution

of an asphalt flux and of asphalt products taken at six two-hour intervals during the conversion, by air blowing,

of the flux to a coating-grade asphalt, were determined. The softening point and asphaltene content of the asphalt products increased linearly with time during the blowing

operation. There was essentially no change in percentage, refractive index, and viscosity of the water-white

oils during blowing. The percentage and refractive index

of the dark oils decreased progressively during the blowing

operation. 4 p. RP2836. Creep of annealed nickel, copper, and two

nickel-copper alloys, W. D. Jenkins and C. R. Johnson

Creep tests were made in tension under constant loads

at temperatures of 300°, 700°, and 900° F on initially annealed specimens of nickel, copper, and 70-percent- nickel-30-percent-copper and 30-percent-nickel-70-percent- copper alloys. Tests at 1,200° F were also made on the

nickel and the two alloys, but not on the annealed copper

as the resistance to creep of copper is relatively low at

this temperature. The investigation included a study of the influence of rate of loading on the creep stress and of prior thermal-mechanical history on the creep behavior

of the alloys at several selected temperatures. Contour and hardness surveys and metallographic examinations were also carried out on some of the fractured specimens

to ascertain the effect of creep on the necking characteristics, hardness, and structures of the metals. 19 p. RP2837. Stress-strain relation of pure-gum rubber vul- canizates in compression and tension, L. A' Wood

The stress-strain curve in tension for a typical pure- gum rubber vulcanizate after a given period of creep, according to Martin, Roth, and Stiehler, can be repre- sented by an empirical equation F = M(L-i - L~2 )expA(L - L~i) where F is the stress based on the original-cross sectional

area, and L is the ratio of stressed to unstressed length, M is the slope of the stress-strain curve at L=l and A

normally has a value close to 0.38. The present paper shows by an examination of data published by Sheppard and Clapson, Treloar, and Rivlin and Saunders that the equation is also valid in the region of compression for values of L as small as 0.5 (50 percent compression) The features of the empirical equation are discussed, and

comparisons are made with the equation predicted by the

statistical theory of rubber elasticity and the equation

derived bv assuming Hooke's law for the stressed cross

section. The consequences of the validity of the empirical equation in terms of the Mooney-Rivlin presentation of the strain energy function are pointed out. The equation 19
predicted by the statistical theory represents observed data very well in the compression region from L = 0.5 to L=1.0. The Mooney equation is approximately valid from L=1.5 to L = 3.5. Neither of these equations is satisfactory in the important intermediate region from L=1.0 to L=1.5. The empirical equation represents the observed data over all three of these regions. It is con- cluded that Young's modulus M can best be obtained from the intercept of a plot of log F/(L_1 — L~2

) against (L — L

_1

). For 0.75<L<2.00 it is thoroughly satisfactory to determine M as the intercept of a plot of F/(L_I —

L~2

) against (L— 1). 7 p. RP2838. Tables for diagonalizing second-order matrices' R. E. Trees and C. D. Coleman

Sets of tables are given to facilitate the evaluation of the eigenvalues and eigenvectors of second-order matrices. 14 p. RP2839. Effects of capillary shape on flow characteristics and degradation of polymer solutions, H. S. White and H. V. Belcher Flow data were obtained using a tapered capillary, a chamfered capillary, and a uniform-bore capillary in a McKee worker consistometer. With polyisobutene-cetane

solutions, degradation occurred at lower rates of flow and

persisted for a greater number of passes with flow entering the smaller end compared to flow entering the larger end

of the tapered capillary. When degradation occurred in both directions at high rates of flow the pressure was

larger for flow entering the larger end though after degra- dation ceased the pressure (used to overcome viscous

resistance) was less for flow in this direction, compared to flow entering the smaller end in each case. Errors which

might arise in the use of single pass instruments with nonuniform capillaries are pointed out. 5 p. RP 2840. Ortho-para catalysis in liquid-hydrogen production, D. H. Weitzel, W. V. Loebenstein, J. W. Draper, and O. E. Park A series of selected or specially prepared catalysts were

studied for their ability to accelerate the ortho to para

conversion of hydrogen. The results of this study are presented, and the performance of various catalysts are compared with that of chromic oxide on alumina pellets. An outstanding catalyst, unsupported hydrous ferric oxide granules, was selected for further study and used in the liquefiers of the National Bureau of Standards Cryogenic Engineering Laboratory. One and one-half liters of

this catalyst has now been used to convert more than

100,000 liters of liquid hydrogen to 90 to 95 percent para

at an average rate of about 235 liters of liquid per hour- There is to date no evidence of decrease in efficiency with

continued use. 7 p. RP 2841. Degradation of cellulose in a vacuum with

ultraviolet light, J. H. Flynn, W. K.Wilson, and W. L. Morrow

Dried, purified, cotton cellulose sheets were irradiated

in a vacuum at 40° C with light of 2537 A wavelength. Hydrogen, carbon monoxide, and carbon dioxide were

evolved, the degree of polymerization (D. P.) decreased, and CHO and COOH groups were produced. The

evolution of hydrogen has not been reported previously. The rate of hydrogen evolution followed a parabolic rate law indicating inhibition by a product. The rate of evolution of carbon monoxide plus carbon dioxide increased

slightly during irradiation. The initial quantum yield was 10~2 for hydrogen and 10~3 for carbon monoxide and

carbon dioxide. A mechanism is proposed in which alcohol groups are photolyzed to carbonyl with the liberation of hydrogen. 5 p. RP 2842. Cavity ionization as a function of wall material,

F. H. Attix, L. DeLa Vergne, and V. H. Ritz A study has been made of the ionization within a flat cavity chamber under irradiation by X- and gamma rays

in the energy region 38 to 1,250 kilovolts effective (kev). Chamber walls were made of carbon, aluminum, copper,

tin, and lead, and the wall separation was varied from 0.5 to 10 millimeters. Results are compared with cavity theory. 9 p. RP 2843. Fragmentation of waterdrops in the zone behind an air shock, O. G. Engel

Observations made on the fragmentation of two water- drop sizes, after collision with air shocks that were moving

at three different supersonic velocities, are reported. The

possible mechanisms of various aspects of the fragmentation process are discussed. The experimental observations

indicate that high-speed-rain-erosion damage should not be observed on spheres having a diameter as large as 4 feet and moving with a Mach number in the range of 1.3 to 1.7 in rain that has a drop diameter of 1.4 millimeter. Waterdrops of this size should be reduced to mist in the zone of separation between the detached shock and the

surface of the sphere according to the results that are reported. A means to extend this protection to spheres

of smaller diameter or to rain of larger size is pointed out. The need for further experimental observation of the time

required for the fragmentation of waterdrops using shocks moving at higher Mach numbers is indicated to verify and

extend the information. 36 p. RP 2844. Transient radio-frequency ground waves over the surface of a finitely conducting plane

earth, J. R. Johler The complete transient signal is reconstructed after propagation via the ground-wave mode over a finitely conducting plane earth in which the displacement currents

are neglected. The theory is illustrated by computations

that have been made on formulas derived by the method

of the inverse Laplace transformation. The results of this analysis indicate that current sources with sinusoidal form

in the time domain could be used to simulate sferics. The methods employed in this analysis can be also used

to reconstruct propagated signals of pulsed radio-navigation systems. 5 p. RP 2845. Measurement of current with a Pellat-type electrodynamometer, R. L. Driscoll The value of an electric current has been determined

in absolute measure by means of an electrodynamometer, and simultaneously by standard cells and standard resis- tors as currently maintained. The electrodynamometer

used was of the Pellat type, and featured a fused silica balance beam and single layer helical coils. The relation of the NBS ampere to the absolute ampere, from this determination, may be expressed as

1 NBS ampere =1.000013 absolute amperes. The uncertainty in this result from all known sources is estimated to be eight parts per million. 10 p. RP2846. Measurement of current with the National Bureau of Standards current balance, R. L. Driscoll and R. D. Cutkosky

Prior to the adjustment of the electrical units in 1948, the value of a current had been determined in absolute

units by means of a current balance and simultaneously measured in NBS amperes by comparison with standard

resistors and standard cells. This work was reported in RP1449. Similar measurements made recently with an electrodynamometer indicate a possible change in the

values of the standards. The present paper reports a

repetition of the work described in RP1449. The purpose

of this remeasurement was to determine whether or not

the standards had changed. Only minor changes were made in the equipment in order that factors which might

have introduced small systematic errors in the results would remain unchanged. 20
According to the work described in this paper, 1 NBS

ampere= 1.000008 absolute amperes. Recent work with

the Pellat electrodynamometer gave the result 1 NBS

ampere= 1.000013 absolute amperes. The weighted mean

of these two values is 1 NBS ampere-1.000010± 0.000005 absolute amperes The results given above for the current balance differ by

6 ppm from those obtained in 1942. This indicates, in view of the uncertainties of measurement, that any change

in the ampere as maintained by standard resistors and

standard cells does not exceed a few parts in a million. 9 p. RP2847. Radial distribution of the center of gravity of random points on a unit circle, F. Scheid

This paper describes some Monte Carlo computations

carried out on the Standards Electronic Automatic Computer (SEAC) which are related to the problem of random

walks. 2 p. RP2848. An adiabatic calorimeter for the range 30° to 500° C, E. D. West and D. C. Ginnings An adiabatic calorimeter accurate to 0.1 percent and

suitable for heat capacity measurements of solids and liq- uids over the temperature range 30° to 500° C is described. Factors affecting the design and accuracy are discussed. Automatic controls permit one-man operation of the

apparatus. Measurements of the heat capacity of AI2O3

agree to 0.1 percent with earlier measurements made with

other calorimeters at the National Bureau of Standards.

8 P. RP2849. An evaluation of the luminous-transmittance

requirements for . railroad-signal glassware in terms of standard source A of the International Commission on Illumination, F. C. Breckenridge As an extension of Research Paper 1688, an estimate

has been made of the transmittance for illuminant A of

signal glassware having the minimum transmittance ac- ceptable under the specifications of the Signal Section of the Association of American Railroads, which are formulated in terms of tests at 2,360° K. 4 p. RP2850. Random notes on matrices, K. Goldberg Three matrix problems are considered in this paper:

Bessel functions as limits of determinants, finding all optimal strategies of a matrix game with nonzero value, and conditions for matrices to have equal principal minors.

6 p. RP2851. Range finders using projected images, R. E. Stephens Two optical range finders of six-inch base length have

been designed and constructed for making measurements

to arbitrary points on a model. One measures distances from 2.5 feet to 10 feet, the other from 9.7 feet to 25 feet. The accuracy of all distances is plus or minus one-quarter

inch or better. Because of unusual requirements of use

these range finders operate by projecting two images of a

bright cross upon the target, which may be fused into a

single image by adjustment of the range knob. 7 p. RP2852. Effect of rib flexibility on the vibration modes of a delta-wing aircraft, W. D. Kroll A systematic study was made to determine whether

decreasing the number of ribs or making the ribs more

flexible would have any appreciable effect on the vibration modes and frequencies of a delta-wing aircraft. The

modes and frequencies were computed for the basic wing

and for the following modifications of the basic wing:

(1) One rib outboard of the fuselage removed, (2) two ribs

removed, (3) stiffness of ribs outboard of fuselage re- duced one-half, and (4) rib stiffness reduced nine-tenths. The results indicated that the frequencies and mode

shapes of the modified wings differed little from those of the basic wing and, therefore, that changes similar to these modifications would not appreciably affect the vibration

characteristics of delta wings. 7 p. RP2853. Thermal degradation of cellulosic materials,

S. L. Madorsky, V. E. Hart, and S. Straus

Fortisan, cellulose triacetate, and N02-oxidized cellulose were pyrolyzed in a vacuum in the temperature range 180°

to 465° C. Cotton cellulose and cellulose triacetate were

also pyrolyzed in nitrogen at atmospheric pressure. The

tar yields were in the decreasing order from: Cotton,

Fortisan, cellulose triacetate, and oxidized cellulose. The other volatiles consisted mainly of acetic acid, carbon

dioxide, and carbon monoxide, from the triacetate; and

water, carbon dioxide, and carbon monoxide from the other

celluloses. In all cases there was a carbonaceaus residue

(volatilization end point), the amount depending on the nature of the cellulose and the temperature of pyrolysis. When pyrolyzed in nitrogen at atmospheric pressure, cotton cellulose and cellulose triacetate yielded less tar than when pyrolyzed in a vacuum. The tar from cellulose triacetate consisted of a compound whose infrared spectrum

resembled that of the original triacetate. Cotton cellulose, Fortisan, and cellulose triacetate do not differ much in their initial rates and activation energies of thermal

degradation. Oxidized cellulose has very high initial rates of thermal degradation. 7 p. RP2854. Role of vitrons in alkali silicate binary glasses, L. W. Tilton Applications of vitron theory to analyses of properties

of R2 0 silicate binary glasses indicate" that changes in slope on the property-composition curves may occur where

there are integral numbers of cations per dodecahedral

cavity or cage of the network. From geometrical considerations it is found that 1 or 2 oxygens and 6 sodiums

can be accommodated inside a cage, and similarly not more

than 1 oxygen and 4 potassiums can be inclosed in a cage. Data on chemical attack and on solubility losses in water

suggest for alkali silicate glasses a maximal average

inclosure of oxygen inside the cavities at 16.7-mole percent

for K2 0, 23.1 percent for Na2 0, and probably 28.6 percent

for Li2 0. These compositions correspond to 1, 1.5, and

2 oxygens per cage. These compositions mark the begi- ning deterioration of the net, possibly because of nonbridging oxygen. Changes in rate of volatilization occur

at 28.6-., 37.5-, and 50.0-percent R2 0 for potash, soda, and

lithia silicate glasses, repectively. These critical compositions are considered those for which the cavities in the

glasses are completely saturated with the modifier oxides, R2 0, and with additional cations, R. Detailed analyses of curves of molar volume versus composition show that the critical points for oxide saturation are evident and that changes in slope may occur at other critical compositions corresponding to integral numbers of cations per cage. It is found that the per- centage of 16.7-percent Na2 0 at high temperatures and

the saturation point of 37.5 percent at low temperatures

are critical in curves for specific (electrical) resistance. The "deep-well" point at 16.7-percent Na2 0 critically separates soda silicate glasses that are very readily devitrified from those that contain more oxide modifier and

are more stable. 14 p. RP2855. Elastic problem for a ring of uniform force in an

infinite body, W. H. Pell Kelvin has given an integral representation for the displacements in an infinite elastic body produced by a body force acting in an arbitrary portion of this body. By a limit procedure, solutions have been found for point and line singularities acting in the interior of such a body. A similiar method is used in this paper to obtain the 21
displacements produced by a uniform force applied along, and normal to, a circle lying in the interior of an infinite elastic body. 9 p. RP2856. Description and analysis of the second spectrum

of molybdenum, Mo II, C. C. Kiess Wavelengths and estimated intensities are presented

for 3,800 lines of Mo n in the spectral range from 6100 A

in the red to 1550 A in the ultraviolet. For approximately

970 of these lines, Zeeman patterns have been measured.

Analysis of these spectral data shows that about 70

percent of the lines can be accounted for as transitions between levels of the even terms in the electron configurations 4d5 and id* 5s, and levels of the odd terms in the

configuration id9 5p. No series have been found from which an ionization potential can be derived. 48 p. RP2857. Forces on cylinders and plates in an oscillating

fluid, G. H. Keulegan and L. H. Carpenter The inertia and drag coefficients of cylinders and plates

in simple sinusoidal currents are investigated. The midsection of a rectangular basin with standing waves surging

in it is selected as the locale of currents. The cylinders and plates are fixed horizontally and below the water

surface. The average values of the inertia and drag coefficients over a wave cycle show variations when the

intensity of the current and the size of the cylinders or plates are changed. These variations, however, can be

correlated with the period parameter Um T/D, where Um

is the maximum intensity of the sinusoidal current, T is the period of the wave and D is the diameter of the cylinder

or the width of the plate. For the cylinders Um T/D

equaling 15 is a critical condition yielding the lowest value of the inertia coefficient and the largest value of the drag coefficient. For the plates the higher values of the drag coefficient are associated with the smaller values of Um T/D and the higher values of the mass coefficient with

the larger values of Um T/D. The variation of the coeffi- cients with the phase of the wave is examined and the bearing of this on the formula for the forces is discussed. The flow patterns around the cylinders and plates are examined photographically, and a suggestion is advanced

as to the physical meaning of the parameter Um T/D. 18 p. RP2858. Reaction of portland cement with carbon dioxide, C. M. Hunt, V. Dantzler, L. A. Tomes, and

R. L. Blaine The reaction of portland cement with carbon dioxide was found to be greatly influenced by the moisture en- vironment of the cement. Reaction with carbon dioxide and water also affected the subsequent hydration of the cement. 6 p. RP2859. Average energy of sulfur-35 beta decay, H. H.

Seliger, W. B. Mann, and L. M. Cavallo The rate of energy emission in an approximately 400-

millicurie source of sulfur-35 was measured by means of a "radiation-balance" microcalorimeter. This value and

the disintegration rate of an accurate dilution of the sample measured by means of 47r/3-gas-proportional counting yield a mean energy for sulfur-35 beta decay of 50.4

(±?-J) kev. The half-life has been determined to be 87.16±0.1 days. 4 p. RP2860. Effect of structure on the thermal decomposition

of polymers, L. A. Wall and R. E. Florin During recent years a considerable number of theoretical and experimental studies have been published on the

kinetics and mechanism of the thermal decomposition of polymers. The treatment of depolymerization as a free- radical chain reaction involving the four basic steps of

initiation, propagation, transfer, and termination seems

adequate for a fairly complete understanding of the process

in a large number of cases. Rate data now available are

discussed from this point of view. It is shown that most

of the characteristics of the thermal decomposition rate curves are a result of their basic structure and not of trace impurities. The magnitude of the rates and activation

energies are, however, sensitive to trace structures or impurities. It is shown that intermolecular transfer will account for the rate behavior in a large number of poly- mers. In a relatively few other cases intramolecular

transfer is indicated to be of more importance. 8 p. RP2861. Comparison of theoretical and empirical relations between the shear modulus and torsional resonance frequencies for bars of rectangular

cross section, S. Spinner and R. C. Valore, Jr. The relations between the modulus of elasticity in shear and the fundamental torsional resonance frequency, mass, and dimensions for bars of rectangular cross section have

been evaluated experimentally. The empirical relation was found to be less than the theoretical approximation

given by Pickett ,by an amount increasing to about 1%

percent as the cross-sectional width to depth ratio of the bars approached 10. In addition to the fundamental torsional resonance fre- quency, the first overtone of the specimens was also de- termined. The overtone was found not to be an exact multiple of the fundamental; it increased more than 5 percent over double the value of the fundamental as the width to depth ratio increased to 10. 6 p. RP2862. Specific volume and degree of crystallinity of semicrystalline poly (chlorotrifluoroethylene)

and estimated specific volumes of the pure amorphous and crystalline phases, J. D. Hoff- man and J. J. Weeks The specific volume of poly (chlorotrifluoroethylene) has been measured from —40° to +260° C. Both quenched and well-crystallized specimens prepared by reproducible procedures were studied. Well-defined glass transitions were found close to 52° C in both specimens. Hence the

glass temperature of this polymer is essentially independent

of the degree of crystallinity. The quasi-equilibrium melting point of the particular type of crystallized speci- men used in the investigation was 216° C. The equilib- rium melting temperature is undoubtedly somewhat

higher, and probably lies between 220° and 225° C. The degree of crystallinity of the crystallized and quenched specimens was calculated at T, from specific- volume measurements alone, using a straightforward ther- modynamic procedure. The method avoids a long "unguided" extrapolation of the liquid data to low temperatures, and does not involve the inexact approximation

that the volume-temperature derivative of the glassy and

crystalline states are the same. It has the further advantage of not requiring a pure crystal density from another

source, such as a unit-cell determination from X-ray data.

It was found that the quenched sample was 39 percent

crystalline and the well-crystallized one 82 percent. A

simple extension of the theory permits the degree of crystallinity to be computed as a function of temperature. The results are compared with those obtained in earlier investigations. The specific volumes and volume-temperature derivatives of the pure supercooled liquid, glassy, and crystalline phases are estimated over a wide range of temperature.

Certain quantities related to the free volume of the glassy

state are discussed. The methods outlined may be of utility in analyzing

specific-volume-temperature data on other semicrystalline polymers where the rapid onset of crystallization interferes with a direct study of the supercooled liquid and glassy

states, and where independent data on the properties of the pure crystalline phase are not available. 15 p. RP2863. Heat and ultraviolet aging of polyvinyl chloride), C. F. Bersch, M. R. Harvey, and B. G- Achhammer

Four poly(vinyl chloride) polymers prepared with differ- ent initiators were exposed to ultraviolet radiant energy

22
and to heat, in a vacuum and in air. The gaseous products

evolved were analyzed by mass spectrometry. Changes

in chemical structure were followed by infrared spectro- photometry. Benzene was among the products evolved

in most cases, and acetone was produced during exposure

to heat in air. Catalyst fragments or other incorporated

impurities affected initiation at very mild conditions.

Susceptibility to degradation increased with increasing oxygen content and unsaturation of the untreated polymer.

Pyrolysis studies indicated a two stage degradation: (1) dehydrochlorination, and (2) decomposition of the result- ant polyene chain. Color formation was attributed to both oxidation and conjugated unsaturation because exposure in air following exposure in a vacuum, and vice versa, caused bleaching of the degraded polymer. 8 p. RP2864. Determination of water vapor from the change

in electrical resistance of a hydroscopic film, E. R. Weaver, E. E. Hughes, and A. W. Diniak The electrical conductivity of a thin film of such a

material as phosphoric acid changes over a wide range

with changes in the concentration of water in the atmosphere with which it is in contact. By adjusting the

pressures of a sample of gas of known composition and one

of unknown composition, they can be made to have the same concentration of water (more accurately the same

fugacity) shown by the production of equal resistances of the detecting film. Modifications of the apparatus, procedures, and calculations described in an earlier publication

are presented and numerous applications of the method

are discussed. The method has the merits of simplicity, speed, and great sensitivity. Only small samples are needed, and few substances interfere. 20 p. RP2865. Improved bridge method for the measurement

of core losses in ferromagnetic materials at high flux densities, W. P. Harris and I. L. Cooter

Accurate core-loss measurements at high flux densities can be made by bridge methods if the power dissipated in the primary circuit at harmonic frequencies is measured

and subtracted from the apparent power dissipated in the ferromagnetic material at fundamental frequency. The

determination of this harmonic power term is inconvenient, and must be done with greater accuracy than that required

in the final result. An amplifier having negative output

resistance was devised and is used in a manner that automatically allows accurate compensation for the harmonic power dissipation. 8 p. RP2866. Stress-strain relationships in yarns subjected to rapid impact loading: 5. Wave propagation

in long textile yarns impacted transversely,

J. C. Smith, F. L. McCrackin, and H. F. Schiefer The behavi6r of an infinitely long flexible filament after transverse impact is treated theoretically. The filament is assumed to have a tension-strain curve that is always concave downward, and to have no short-time creep or stress- relaxation effects. Under most conditions the impact

initiates a variable strain that propagates down the fila- ment between an "elastic wave" front and a "plastic wave"

front. A transverse wave, shaped like an inverted V, then travels in the constant-strain region behind the

plastic-wave front. Under special conditions the trans- verse-wave front may propagate faster than the plastic- wave front, but the shape of the transverse wave remains

the same. The theory for both cases is worked out in

detail, and some illustrative examples are given. 18 p. RP2867. Measurement of flame speeds by a nozzle burner method, C. Halpern The literature records a great many measurements,

using stationary flames on burners, of the speed with which flame moves through combustible mixtures of gases.

Despite the fact that the method itself seems reasonably

simple, the results obtained by various investigators often

are not in good agreement. One of the phases of a pro- gram of research on combustion has been a study of some

of the reasons for the differences among recorded values

of flame speed measured by the burner method. The

primary objective of this task has been to develop the precautions that should be observed in applying the method, rather than to evolve numerical values" of flame

speed. This paper describes progress that has been made

since the apparatus was described originally in 1951, and

presents values of flame speeds of methane-air mixtures

obtained since then, together with comparisons of these

values with those obtained by two flame theories. 12 p. RP2868. Growth of preferentially oriented aluminum

single crystals, T. H. Orem

Monocrystalline aluminum specimens having both a

preferential orientation and a specified cross-sectional shape are very difficult to produce. Such specimens must be grown in a vertical furnace, a condition which,

while permitting the choice of cross-sectional shape in the specimen, makes it extremely difficult to obtain speci- mens of preferred orientation. It is fairly easy to grow

preferentially oriented monocrystalline aluminum speci- mens when a horizontal furnace is used, but the use of such a furnace limits the choice of cross-sectional shapes

in the finished crystal. Crystals of circular cross-sectional shape are practically impossible to grow in a horizontal

furnace. The method described herein can be used to grow monocrystalline aluminum crystals with any desired orientation

or cross-sectional shape. 3 p. RP2869. Marginal performance of corrected ophthalmic

lenses, F. E. Washer and W. R. Darling The measured values of the departures of the marginal

meridional and cylindrical powers from the corresponding measured values of the axial powers for 311 corrected ophthalmic lenses are reported. The spherical refractive powers of the lenses studied range from +7.00 to —20.00

diopters with cylindrical powers of 0.00 to 4.00 diopters. The probable errors of measurement are discussed. A

set of tolerance values is suggested, and the degree of compliance with these suggested tolerances is shown.

12 p. RP2870. Enthalpy and heat capacity from 0° to 900° C

of three nickel-chromium-iron alloys of

different carbon contents, T. B. Douglas and

A. W. Harman

The enthalpy relative to 0° C of three alloys was measured at nine temperatures from 100° to 900° C by a precise "drop" method. The alloys contained approximately 76

percent of nickel, 15 percent of chromium, and 8 percent

of iron, with carbon contents of 0.02, 0.07, and 0.11 percent, respectively. The results are almost independent

of the several variations in prior heat treatment investi- gated, and the heat-capacity-temperature curves of the

three alloys are almost coincident, but there is a marked

shift in each curve within the interval 500° to 600° C.

6 p. RP2871. Relative strengths of forty aromatic carboxylic

acids in benzene at 25° C, M. M. Davis and

H. B. Hetzer The relative strengths of benzoic acid, 31 of its monosubstituted derivatives, 7 disubstituted derivatives, and

one trisubstituted derivative have been measured in terms

of the equilibrium constants (K") for association with

the reference base 1,3-diphenylguanidine in benzene at 25° C. The measurements were performed spectrophotometrically, using the indicator acid bromophthalein magenta E (tetrabromophenolphthalein ethyl ester) as the

reference acid, the equilibrium constant K' for association 23
of the indicator with diphenylguanidine being known from

previous work. Equilibrium constants for p-orsellinic (2,6-dihydroxy-p-toluic) acid and 2,4,6-trinitrobenzoic acid could not be measured, as these acids appear to

associate completely with diphenylguanidine under the

conditions of the experiments.

Plotting log K" values against the corresponding pK

values for aqueous solutions of the acids gives an essentially linear relationship in the case of acids with meta- and parasubstituents only, but the line for para-substituted acids has a slightly different slope from the line for w-substituted

acids. Similar comparisons were made with published data on relative strengths in alcohols or dioxane-water

mixtures. ori/jo-Substituted acids show marked solvent

effects. Explanations of the solvent effects have been

suggested, and various theoretical implications and possible applications of the results are discussed. The theoretical discussion includes evaluation of constants of the Hammett equation. 24 p. RP2872. Shape of the liquidus surface as a criterion of stable glass formation, E. H. Hamilton and

G. W. Cleek The slope of the liquidus curve or surface at a point in a phase diagram representing a specific chemical composition

has been found to be a reliable indication of the glass-forming tendency of that composition. The observed effect is interpreted in terms of the structure of the glass. 4 p. RP2873. Twinned epitaxy of copper on copper, T. H. Orem A study of the X-ray diffraction patterns of copper elec- trodeposited on copper monocrystals having surfaces parallel to the cubic, dodecahedral, and octahedral planes shows an interesting relationship between electrodeposit and base crystal. At the current density used for electro- deposition, the electrodeposit on the surface parallel to the dodecahedral plane was a monocrystalline continuation of the orientation of the base crystal in every respect. The

electrodeposit on the surface parallel to the octahedral plane was a highly preferentially oriented polycrystalline electro- deposit made of microcrystals, some of which continued

the orientation of the base crystal, whereas others were twinned with respect to the surface plane of the base

crystal. In the case of electrodeposition on the surface

parallel to the cubic plane, the electrodeposit was also a

highly preferentially oriented polycrystalline electrodeposit made up of microcrystals, some of which continued the

orientation of the base crystal, whereas others bore a twin

relationship to the close-packed planes of the base crystal. 12 p. RP2874. Dielectric constant of deuterium oxide, C. G. Malmberg An equal ratio-arm, capacitance-conductance bridge op

erated at frequencies below 100 kilocycles per second was

used to measure the dielectric constant of deuterium oxide with an accuracy of 0.1 percent or better in the range 4°

to 100° C. A value of 77.94 was found for the dielectric constant at 25° C. The data fit the relation

« = 87.482 - (0.40509X+ (9.638 X lO"4 )/2 - (1.333X lO"8 )/

3

, with a maximum deviation of less than 0.01 unit in dielectric constant. These values were obtained by using a sample having a deuterium oxide content of 99.38 mole

percent. Deviation of these values from those for pure deuterium oxide, as a result of isotopic contamination, is estimated to be less than 0.005 unit. Some aspects of the temperature dependence of the dielectric constant and of that of a macroscopic polarization are discussed. 4 p. RP2875. Additional abscissas and weights for Gaussian

quadratures of high order: values for n =64,

80, and 96, P. Davis and P. Rabinowitz

Abscissas and weights for Gaussian quadratures of orders n = 64, 80, and 96 are given to twenty decimal places. 2 p.

RP2876. Mass spectra of aromatic hydrocarbons filtered from smoky air, F. L. Mohler, P. Bradt, and

V. H. Dibeler

Public health service chemists collected particulate matter from smoky air and separated aliphatic and aromatic hydrocarbons from this material. These samples have been analyzed by two methods. In one method the sample

is slowly evaporated from a tube furnace directly into the mass spectrometer and spectra recorded as the temperature

is increased step by step. In the other method the sample

is completely vaporized in a heated reservoir and the vapor

passed through a leak into the mass spectrometer. Mass

spectra of the aliphatic compounds are not reported in detail. Mass spectra of the aromatic fractions evaporated from the tube furnace show sharply defined fractionation with molecule ions of fused-ring aromatics predominant. Compounds containing three to seven fused rings are ten- tatively identified. The mass spectrum from the reservoir mass spectrometer was recorded at ionizing voltages of 70 v and at a low voltage, which gives predominantly molecule ions. The fused-ring aromatics include compounds

that are carcinogenic. 4 p. TITLE PAGE AND CONTENTS TO VOLUME 60. 6 p. RESEARCH PAPERS FROM JOURNAL OF RESEARCH OF THE NATIONAL BUREAU OF STANDARDS, VOLUME 61, JULY- DECEMBER 1958 RP2877. The system lime-alumina-water at 1° C, E. T. Carlson A study was made of phase equilibria in the system CaO-Al2 03-H2 0 at 1° C. The stable phases are believed

to be gibbsite, tetracalcium aluminate hydrate, and Ca(OH) 2 , but no solubility curve was established for gibbsite because of extreme slowness of reaction. The compound 3CaO- A1 2 03 -6H 2 0 appears to be metastable, being very slowly transformed to one or the other of the hexagonal hydrates. Metastable equilibrium curves were

established for CaO- A1 2 03

- 10H 2 O and 2CaOAl2 03 -8H 2 0. The concentration at their intersection (a metastable in- variant point) is about 0.10 g of A1 2 03 and 0.38 g of CaO

per liter. The dicalcium compound can readily be dried to a 6H 2 0 stage, giving a characteristic X-ray pattern. During the long storage period required to approach

equilibrium, most of the reaction mixtures picked up a

little C02 , apparently by absorption through the poly- ethylene containers, with formation of a carboaluminate, probably 3CaO Al 2 03 CaC03 llH 2 0. 11 p. RP2878. Heat content of zirconium and of five compositions of zirconium hydride from 0° to 900° C, T. B. Douglas and A. C. Victor Using a precise Bunsen ice calorimeter, a "silver core"

furnace, and a "drop" method, the heat content (enthalpy)

of zirconium metal and five samples of zirconium hydride

(24 to 52 atomic percent hydrogen) was measured over

the range 0° to 900° C. Thermal hysteresis of the hydrides was investigated in several cases, and corrections were applied for the impurities in the samples. At each temperature up to 550° C the heat contents of the hydrides

relative to 0° C were found to vary linearly with composition, a fact in accord with the phase diagram of the sys- tem. The effective heat capacity of each hydride sample

reached its maximum value between 550° and 600° C, a behavior that can be interpreted as due to the endothermic

formation of the high-temperature beta phase, lip. RP2879. Uniform transient error, E. L. R. Corliss The economy of transient error is discussed. Equations

describing error in power-level measurements of transients can be used to compute the design of analyzers so as to distribute transient error in a way compatible with experi- mental requirements. In addition, consideration of a

limiting power-discrimination factor provides a measure of the largest number of bandpass filters that can be over- 24
lapped on adjacent channels to yield meaningful information about a rapidly changing signal. A scanning filter can be compared with a set of bandpass filters by calculating the effective number of overlapped bandpass filters providing the same resolution as the scanning filter. The

results are applicable to autocorrelation analyzers. Restrictions on rapid signal analysis also are considered for the special case in which power-level discrimination is limited by noise. 6 p. RP28S0. Optical T-bench method of measuring longi- tudinal spherical aberration, F. E. Washer A method of measuring longitudinal spherical and chro- matic aberration by visual means is described. The

method employs an especially constructed optical T-bench

equipped with nodal slide and an angle-measuring tele- scope. The underlying theory of the method is presented, together with a brief description of the apparatus used. The results of measurement on a few typical lenses and an

analysis of the sources of error are included. 9 p. RP2881. Mass spectrometry study of the rate of thermal

decomposition of hydrazoic acid, J. L. Franklin, V. H. Dibeler, and P. P. Morris, Jr. Hydrazoic acid vapor at low pressures (0.15 mm Hg or

less), has been decomposed thermally and the rate of re- action studied mass spectrometrically at 265° to 325° C. Nitrogen and ammonia are the only reaction products, and no intermediates were observed. The disappearance

of HN3 is first order and the reaction occurs on the walls

of the glass reaction vessel. The experimental activation energy is 31 kilocalories per mole. The activation energy

for the reaction HN3 —»NH-f N2 must be at least 39 kilo- calories per mole. 6 p. RP2882. Erosion damage to solids caused by high-speed

collision with rain, O. G. Engel. The stresses that are produced when a liquid drop collides with the planar surface of a solid are discussed. These are a result of the impact pressure and the conse- quent radial flow of the drop. It is concluded that a rain- erosion resistant material may be either soft and rubbery

or hard and rigid. If it is soft and rubbery it mitigates

the applied stresses but it must be able to withstand the

mitigated stresses. If it is hard and rigid it does not

mitigate the applied stresses and it must be able to with- stand the unmitigated stresses. 6 p. RP2883. Emission spectrum of carbon monoxide from

2.3 to 2.5 microns, E. K. Plyler, H. C. Allen,

Jr., and E. D. Tidewell The 2-0, 3-1, 4r-2, 5-3, and 6-4 emission bands of carbon monoxide have been measured in the region from 4000 to 4360 cm-1 with a grating spectrometer. A 10,000 line per

inch grating used in the second order resolved lines separated by 0.08 cm-1

. Several sets of measurements were made on the 2-0 band and the molecular constants were

calculated. The constants in cm-1 are B0 = 1.922511 ±

0.000025 A= 6.13±0.02X 10"6

. Using these values and

the S0 from 1-0 band in conjunction with the microwave

constant a new determination of the speed of light is obtained, c = 299, 794 ±3 kilometers per second. 4 p. RP2884. Further studies of the influence of a ridge on the low-frequency ground wave, J. R. Wait and

A. Murphy

Computations are presented in graphical form for the

perturbation of a plane wave by a semicylindrical boss on

an otherwise fiat ground plane of perfect conductivity. The height of the ridge is comparable to the wavelength.

This is an extension of earlier work on the semielliptical

boss. 4 p.

RP2885. Infrared studies on polymorphs of silicon dioxide and germanium dioxide, E. R. Lippincott, A. Van Valkenburg, C. E. Weir, and E. N. Bunting The infrared spectra of coesite, low-temperature tridy- mite, low-temperature cristobalite-low-temperature quartz,

vitreous silica, hexagonal Ge02 , tetragonal Ge02 , and

vitreous germania are reported from 4,000 to 300 cm-1

. Wherever possible an assignment of frequencies has been made on the basis of the selection rules for the crystal symmetry. Three characteristic group frequencies near

1,100, 800, and 480 cm"1 are common to all the polymorphs

of Si02 . These frequencies respectively correspond to a

stretching mode involving displacements associated primarily with the oxygen atoms, a stretching mode involving displacements associated primarily with the silicon atoms, and a Si-0 bending mode. The presence of these group

frequencies in coesite indicates that the coordination of

silicon in coesite is tetrahedral and that its high density

is associated with the packing of tetrahedral units at an

angle approximating 120 degrees. The tetragonal and

hexagonal Ge02 polymorphs show a marked difference in spectra due in part to the change from sixfold to fourfold

coordination. The assignment of observed frequencies

in hexagonal Ge02 is consistent with that made for low- temperature quartz if allowance is made for the heavier mass of the Ge atom. 10 p. RP2886. Carbon-14 carboxy-labeled polysaccharides, J. D. Moyer and H. S. Isbell Procedures are given for the preparation of C14 carboxy- dextran and C14 carboxyinulin. These materials have C14-labeled carboxyl groups in place of the reducing end

groups present in the parent polysaccharides. The substances can be prepared cheaply and should find many

applications as tracers in biological and chemical research.

3 p. RP2887. Heat of formation of sodium calcium aluminate,

E. S. Newman

The compounds 3CaO-Al2 03 , Na2 S04 V (Thenardite), Na2 0-8CaO-3Al2 03 , and CaS04 , anhydrite, were prepared, and their heats of solution in HC1, 26.61H2 0 were deter- mined. The heat of solution of Na2 S04 V in water to form Na2 S04 , 1000H2 O was also measured. From these and other data in the literature the heats of formation of Na2 0-8CaO-3Al2 03 and NaS04 V were calculated to be -2567 and -330.92 kcal/mole, respectively. 2 p. RP2888. Thermal degradation of polyacrylonitrile, poly- butadiene, and copolymers of butadiene with

acrylonitrile and styrene, S. Straus and S. L. Madorsky

Polybutadiene and a copolymer consisting of 76.5 percent butadiene and 23.5 percent of styrene were in- vestigated as to the rates of their thermal degradation. The rates for polybutadiene indicated an activation energy

of 60 kilocalories per mole. The copolymer had very high

initial rates of degradation, followed by a rapid drop, so that it was not possible to obtain a reliable activation energy.

Polyacrylonitrile and a copolymer consisting of 31 percent of acrylonitrile and 69 percent of butadiene were

investigated with regard to the nature and distribution of

volatile products, as well as to the rates of their thermal

degradation. The rates were very high initially, but dropped rapidly so that it was not possible to determine

accurately the activation energy. The acrylonitrile- butadiene copolymer showed a decomposition pattern

similar to that of polybutadiene. Here, too, the activation energy could not be deduced accurately from the rate curves. Comparative thermal stability in terms of temperature, at which half of the polymer sample is evaporated

in 35 minutes of heating, is as follows: 407° C for poly- 25
butadiene, 374° C for SBR, 364° C for polystyrene, 360° C

for NBR, and 316° C for polyacrylonitrile. 5 p. RP2889. On the motion of two cylinders in an ideal fluid, L. H. Carpenter The complex potential of two cylinders moving in an

infinite liquid is determined by the method of image

doublets, and the solution is expressed as an infinite series in rectangular coordinates. Approximate solutions in

finite form are given for various cases. A method for generalizing the solution for the case of more than two

cylinders is indicated. Applications to the flow induced by

a cylinder moving in the presence of plane boundaries are given and the stream lines are illustrated in certain cases. 5 p. RP2890. Properties of sodium titanium silicate glasses, E. H. Hamilton and Given W. Cleek The glass-forming area of the Na2 0-Ti02-Si02 system was surveyed. Glasses were made with refractive indices from 1.5184 to 1.8005, nu values from 51.5 to 23.2, and

densities from 2.42 to 3.00. The glasses have higher

dispersions and have considerably lower densities than the PbO glasses with comparable refractive indices. 6 p. RP2891. Wavelengths from thorium-halide lamps, W. F. Meggers and R. W. Stanley The present system of international secondary standards

of wavelength for spectroscopic measurements is based on

interferometric determinations of wavelengths emitted at atmospheric pressure by an electric are between iron elec- trodes. Because of the poor quality and uneven distri- bution of these iron standards they are not suitable for accurate measurement of wavelengths in the spectra of heavier elements, most of which are more complex and

consist of much sharper lines that the standards. Quartz- tube lamps containing a small quantity of a thorium halide, when excited by microwaves, emit thousands of uniformly sharp and evenly distributed lines whose wavelengths, or positions in a spectrum, can be determined with about

one-tenth the error of locating iron-arc lines. Preliminary

values of 222 vacuum wavelengths emitted by a thoriumiodide lamp have been measured relative to 5462.2705 and

4047.7144 A emitted by a similar lamp containing mercury198. Fabry-Perot interferometers with plate separations

of 25, 40, or 50 millimeters were used with a stigmatic

grating spectrograph in making these measurements. The

thorium wavelengths range from 3288. 7356 to 699 1 . 5839 A in vacuum and from 3287.7885 to 6989.6562 A in standard

air. The accuracy in relative value of 27 classified thorium

lines is tested by means of the combination principle, which indicates that the average error is less than 1 part

in 20 million. 9 p. RP2892. An electrical-analog method for transient heatflow analysis, A. F. Robertson and D. Gross An electronic instrument is described which permits

solution of transient heat-flow problems by use of direct analogy to electrical networks. The instrument is of the

so-called "fast-time" type, simulating the transient in- volved in times of the order of 10-6 that of the thermal

prototype. A photoformer type of input-signal generation

is used and this, together with a variable-frequency master

oscillator, permits flexibility of input-signal waveform and

time scale. Some applications of the instrument to the field of fire research are described. The discussion of errors includes consideration of those resulting from the lumping of circuit elements, lip. RP2893. Effect of crystal field and spin-orbit coupling on magnetic susceptibility of systems with / electron

configuration, C. M. Herzfeld and D. B. Levine The effects of a crystal field of octahedral symmetry

and of spin-orbit coupling on an ion with f

2 electron configuration are considered. Only fourth-degree terms in the crystal-field potential are taken into account. The

eigenvalues and eigenvectors of the resulting 33X33

secular determinant are determined numerically on the 704

electronic computer at the National Bureau of Standards

for eight values of D/f, where D is a crystal-field parameter, and f the spin-orbit coupling constant of the ion. Pertur- bations by an external magnetic field are computed using second-order perturbation theory. All eigenvalues are tabulated for D/f=-10-<, -2X10-*, -5X10-«, -10"' -2X10-', -5X10-", -10-2, -10-'. They can be adapted directly to any finite nonzero positive value of f and, by interpolation, for values of D/f not tabulated. The magnetic susceptibility of a powder is calculated and

displayed as a function of temperature and D/f, for f = <x>

103 cm-1

, and 5X 102 cm-'. The relation of the results of the calculations to measurements on compounds of U+i

is discussed. 5 p. RP2894. Vibration-rotation bands of ammonia: 1. The

combination bands i^+Oi, V3), W. S. Benedict, E. K.

Plyler, and E. D. Tidwell A general discussion is given of methods used in the

analysis of NH3 vibration-rotation spectra, including the

derivation of molecular constants and the determination

of line strengths and line widths. Results are given for the region 2.15 to 2.48 n (4,060 to 4,700 cm"1 ), in which more than 800 lines have been measured. These have

been analyzed into the inversion-doubled perpendicular combination band v2 + v3 (v0 = 4416.908 and 4434.610 cm-1

; band strength= 19.7 cm-2 atm-1

) and the inversion- doubled parallel combination band vi + v2 (v<>= 4293.716 and 4320.060 cm"1

; band strength = 2.9 cm"2 atm"1 ). Complete energy levels for these bands have been found up

to J =12 and 10, respectively, permitting determinations

of molecular constants, which include numerous higher- order effects involving the interaction of rotation, vibration and inversion. The line widths range from a maximum of 0.57 cm-1 atm-1

, when K= J to a minimum of <0.2 cm-1 atm-1

, when K<kJ. 25 p. RP2895. Evaluation of tensile, compressive, torsional, transverse, and impact tests and correlation

of results for brittle cermets, M. J. Kerper,

L. E. Mong, M. B. Stiefel, and S. F. Holley

Static tests were studied for the determination of mechanical properties of brittle materials. Specimens of brittle materials, represented by cermets having five different compositions, were subjected to tensile, compressive,

torsional, transverse, and impact tests. The designs of specimens and apparatus suitability of the tests to the

materials, refinements in test procedures, and the variability of results and their correlation were studied. The

elastic properties were obtained from tensile, compressive, and transverse tests, and the modulus of rigidity calculated from the results of these tests agreed with that from the

torsional test. Tensile strength was obtained from the

tensile, torsional, and transverse tests on specimens of comparable sizes in accordance with a limiting tensile

strain. Shear strengths were obtained in the compressive

tests. The correlation of impact values with mechanical

properties was unsatisfactory. 21 p. RP2896. Redetermination of mass spectra of deutero- methanes, F. L. Mohler, V. H. Dibeler, and

E. Quinn Mass spectra of the four deuteromethanes have been remeasured using samples of improved isotopic purity. The relative abundances of fragment ions involving loss of H or D atoms from the molecules CH3 D, CH2 D2 , and CHD3 are not proportional to the a priori probabilities of removing H or D atoms but have been expressed in terms

of the a priori probability times a weighting factor. The

weighting factor for removing one H or D atom from these molecules can be roughly expressed as positive and negative powers of a single constant 1.19 ±0.015 and the same

26
power law holds for the relative abundances of H+ and D+. Weighting factors for removing two or more hydrogenic atoms are not consistent with this power law. 2 p. RP2897. Effect of strain-temperature history on the

tensile behavior of titanium and a titanium

alloy, G. W. Geil and N. L. Carwile

This study was made to determine the effect of prestraining specimens in tension under uniaxial and multiaxial stresses at a selected temperature on their tensile behavior at a different temperature. Unnotched and

notched cylindrical specimens of initially annealed, commercially pure titanium and initially annealed 4-percent- aluminum, 4-percent-manganese, titanium alloy were

extended at selected temperatures to various true strains and then extended to fracture at another temperature. The ductility retained by the prestrained specimens de- creased with increase in the prestrain, whereas the strength

indices generally were nearly independent of the amount of the prestraining. However, strength indices obtained on some of the deep-notched specimens of the alloy at — 196° C were decreased by prestraining at +25° C as a

direct result of the very low retained ductility of the prestrained specimens. 14 p. RP2898. Propagation of very-low-frequency pulses to great

distances, J. R. Wait A theoretical study is presented for the propagation of electromagnetic pulses at very low frequencies to large

distances. The space between the earth and the iono- sphere is represented as a wave guide with sharply bounded

and concentric spherical boundaries. The concept of phase and group velocity and its application to the present problem is discussed in some detail. The influence of the propagation medium on the shape of the envelope of a quasi-monochromatic pulse is also considered. Using

an alternative approach, the response of an impulsive

source is also calculated and is shown to be a damped

oscillatory function of time with a quasi-half-period varying in a predictable manner with distance of travel

in agreement with the observations of Norinder and

Hepburn. 17 p. RP2899. Transmission and reflection of electromagnetic waves in the presence of stratified media, J. R. Wait A general analysis is presented for the electromagnetic

response of a plane stratified medium consisting of any number of parallel homogeneous layers. The solution is

first developed for plane-wave incidence and then generalized to both cylindrical and spherical-wave incidence. Numerical results for interesting special cases are presented and discussed. The application of the results to surface- wave propagation over a stratified ground is considered

in some detail. 28 p. PP2900. Pseudoternary system calcium oxide-monocal- cium aluminate (CaOAl2 03 )-dicalcium ferrite (2CaO-Fe2 03), T. F. Newkirk and R. D. Thwaite The system CaO-CaOAl2 03-2CaOFe2 03 is of importance to portland cement chemistry because it provides

information on the composition of the iron-bearing phase

in cement clinker. Iron-bearing solid solutions in the system were found

to exist as a continuous narrow band extending from 2CaO-Fe2 03 to 6.45CaO-2.31Al2 03 F2 03 . Additional tie lines were established to show the composition of the

iron-bearing solid solution phase (Fss) and liquid phases

during the course of crystallization of mixtures within the

system. Isotherms have been located for the regions of principal interest. Compatibility relations differ some- what from those reported by previous investigators. The

composition of the iron-bearing phase in equilibrium with CaO and 3CaO-Al2 03 at the ternary invariant point proved

569918 O—61 3

to be lower in Fe2 03 than that reported by Swayze. Other

results are in general agreement with the work of Swayze

and of Yamauchi. 13 p. RP2901. Heats of formation of diborane and pentaborane, E. J. Prosen, W. H. Johnson, and

F. Y. Pergiel The heats of formation of diborane and pentaborane have been determined by measurements of the heats of decomposition into amorphous boron and hydrogen in a

calorimeter. The heats of formation at 25° C, from amorphous boron and hydrogen, are 6.73 ±0.52 kcal/mole

for diborane (gas) and 12.99 ±0.39 for pentaborane (gas). 4 p. RP2902. Temperature of the inversion in cristobalite, R. F. Walker, S. Zerfoss, S. F. Holley, and

L. J. Gross The inversion temperature of cristobalite prepared from

pure precipitated silica gel was compared with that of less pure cristobalite, including material derived from quartz.

All materials showed a variability in their inversion temperature which was dependent on their thermal

history. However, evidence suggested that a sufficiently extended heat treatment at high temperatures would in each case produce a uniform product with invariant

inversion temperatures attributable to the low-high and

high-low inversions. It is proposed that the variability

of the inversion temperature can be rationalized in terms of three rate processes dependent on the temperature of heat- treatment, viz., nucleation, ordering, and crystal growth. The effect of all other factors known to influence the inversion temperature is either to accelerate or retard the rate

of one or more of these processes. 11 p. RP2903. Infrared emission spectra of flames under high

resolution, E. K. Plyler and E. D. Tidwell The spectrum of a hydrogen-oxygen flame and an oxyacetylene flame has been measured in the near infrared region with a high-resolution grating spectrometer. In

the region from 3.7 to 4.1 n many lines are observed which

have not been classified. They may arise from transitions belonging to the v2 or v 3 bands of water vapor. The

intensity of the first overtone band of CO was increased when a high-frequency discharge was passed through the flame and the infrared CN band was increased in intensity when N2 0 was mixed with the acetylene. The results are shown in five figures of the observed spectra. 6 p. RP2904. Improved description of hafnium spectra, C. H.

Corliss and W. F. Meggers

Earlier descriptions of atomic hafnium spectra, from

conventional arcs or sparks, have been handicapped by the absence of pure samples and by the presence of a strong background of molecular spectra. Recent availability of highly purified hafnium metal, and the development of a new light source, removed these handicaps. This im- proved description of hafnium spectra was made by

employing electrodeless metal-halide lamps excited, at

relatively low pressure and temperature, by microwaves. Lamps of hafnium iodide, hafnium bromide, and hafnium

chloride were compared to recognize the spectra of halogens

or their compounds and thus arrive at the atomic hafnium

lines common to different lamps. The number of lines now ascribed to hafnium spectra exceeds 6,200 as compared

with about 2,400 heretofore. The wavelengths range from

1284.88 to 12043.08 A, and estimated relative intensities in different light sources (including arcs, sparks, and electrodeless lamps) indicate which lines belong to Hfi, Hfn, Hfm,

and Hfiv. The splitting of spectral lines in magnetic

fields (Zeeman effect) has also been improved by using magnetic fields of higher intensity, and greater spectro- graph^ resolving power than before. The number of lines for which Zeeman patterns have been observed has been

increased from 280 to 1,030, and the types of complex27
patterns invariably confirm the assignments of lines to Hfi or Hfn. 56 p. RP2905. Dielectric constant of hydrogen-bonded liquids, F. Buckley A simple extension is presented of Onsager's electrostatic theory of dielectric polarization to take account of the "excess" polarization due to hydrogen bonding. Dielectric data for a number of liquid mixtures are analyzed and

the deviations from ideal behavior expressed in terms of an

excess polarization. A method is developed for calculat- ing the excess polarization and certain related molecular

parameters. Tentative values of these parameters have

been determined for some particularly simple structures. 18 p. RP2906. On the diffraction and reflection of waves and

pulses by wedges and corners, F. Oberhettinger Various problems arising in the theory of the excitation

of a perfectly reflecting wedge or corner by a plane,

cylindrical, or spherical wave, are dealt with. The

incident wave is represented by a line source (acoustic or electromagnetic) parallel to the edge. The spherical wave

is emitted by an acoustic point source or by a Hertz

dipole with its axis parallel to the edge. The case of an

incident plane wave field is obtained as the limiting case

(for large distances of the source from the edge) of the

cylindrical or spherical wave excitation. 23 p. RP2907. A liquid-helium cold cell for use with an X-rav

diffractometer, I. A. Black, L. H. Bolz, F.

P. Brooks, F. A. Mauer, and H. S. Peiser A liquid-helium cold cell for use with the General Electirc X-ray goniometer has been designed and constructed..

It is used to obtain X-ray diffraction patterns of polycrystalline solids deposited from the gaseous phase on a

helium-cooled surface. This work is part of the program

for studying the stabilization of free radicals. 5 p. RP2908. The second spectrum of ruthenium (Ru n), A. G. Shenstone and W. F. Meggers

Wavelengths and estimated intensities of 2,227 spectral

lines characteristic of singly ionized ruthenium atoms are

presented. The wavelengths range from 1054.684 to 6371.29 A. The Zeeman effect has been investigated for 488 lines ranging from 2323 to 4010 A. Analysis of these

basic data of Ru n has resulted in the classification of 1,633 lines as transitions between 68-even, and 140-odd energy levels. All but three of these levels have been grouped into designated spectral terms and assigned to

electron configurations. The low-even terms arise from

4d\ 4rf6 5s, and id6 5s2

. All the terms from the 4rf7 configuration have been found, and 4d1 a

4 F represents the ground state of Ru n. From two members of the 4d° ns"D series a limit, 135200 cm-1

, has been calculated which

indicates a principal ionization potential (I. P.) of 16.76

electron volts for Ru+ ions. 39 p. RP2909. Self-ignition temperatures of materials from

kinetic-reaction data, D. Gross and A. F. Robertson

Results of experimental determinations of the kinetic constants of the self-heating reaction are presented for wood fiberboard, cotton linters, sugar pine, cork, crepe

rubber, GRS rubber, natural, synthetic, and blended foam rubber (with and without additive), various oils (raw linseed, cottonseed, rapeseed, sperm, olive, castor, and neatsfoot) applied to cotton gauze in a ratio of 1 part of oil to 6 parts of cotton by weight, ammonium perchlorate, and nitrocellulose plastic. Under the assumption

that self-heating follows a first-order reaction, these constants were used to calculate the critical radii of spherical piles for each of four surfaee temperatures likely to be experienced in long-period storage. Calculated

self-ignition temperatures of piles of ^-inch-diameter to 22-inch-diameter spheres of wood fiberboard and ^-inch- diameter to 2-inch-diameter spheres of cotton linters were

in reasonable agreement with previous measurements by

N. D. Mitchell (National Fire Protection Association Quarterly 45: 162, 1951). 5 p. RP2910. Some studies of atmospheric transmittance on Mauna Loa, R. Stair and R. G. Johnston

Studies are described of the spectral intensity of solar radiation and its transmission through the atmosphere above a new 11,140-foot-altitude station on Mauna Loa, Hawaii, during May and June 1957. The spectral measure- ments covered the region from 300 millimicrons to 2.5 microns for different air masses from about 3.0 to 1.0. The amounts of ozone and of water vapor which were

present in the upper atmosphere were calculated from

spectral data obtained on several different days. 7 p. RP2911. Central notations for the revised ISCC-NBS

color-name blocks, K. L. Kelly Nickerson and Newhall published, in 1941, the central notations of the original ISCC-NBS (Inter-Society Color Council-National Bureau of Standards) color-name blocks which were used in the preparation of the soil and rock color-name charts. In 1955, the ISCC-NBS color- name blocks were revised to accord more closely with

usage in the textile and other fields (NBS Circular 553). The central notations of these revised color-name blocks have been computed and are given in the present paper in tabular form. A color chart showing the central colors of the 267 ISCC-NBS color-name blocks would serve

for rapid determination of the ISCC-NBS color designation, especially in field work where speed and ease of operation are more important than high accuracy. 5 p. RP2912. Viscosity of n-hexadecane, R. C. Hardy

Attempts to prepare high-purity n-hexadecane from

commercial cetane by simple laboratory procedures were

unsuccessful. Fractional distillation at' reduced pressure,

of material previously treated with silica gel, produced

a few small fractions" of about 99.5-mole-percent purity. The kinematic viscosities of the original material and of the fraction of highest purity, 99.63-mole percent, were found to be the same, 4.4635 centistokes at 20°. All other fractions had lower viscosities. The viscosity of NBS standard sample of n-hexadecane, 99.94-mole percent, was found to be 4.4642 centistokes or 3.4540 centi- poises at 20° C. ra-Hexadecane is not likely to be suitable

for use as a second calibration standard for viscometry

until a simple, easily defined routine of purification is developed. 4 p. RP2913. Revision of the phase equilibrium diagram of the binary system calcia-titania, showing the compound Ca4 Ti 3 Oi0 , R. S. Roth The compound Ca4 Ti 3 Oi0 has been found to be a stable phase in the system CaO-Ti02 . It melts incongruently

at about 1755±10° C, presumably to CaTi03 plus liquid. This compound is shown in a revision of the phase diagram

for the system CaO-Ti02 . 4 p. RP2914. Term analysis of the second spectrum of rhenium

(Re n), W. F. Meggers, M. A. Catalan, and M. Sales Wavelengths and estimated intensities of approximately

2,000 spectral lines emitted by singly ionized rhenium

atoms were available for this analysis. Observed Zeeman

patterns for 220 Re n lines facilitated finding and inter- preting the first energy levels. The analysis continued

until 49 low-even, and 85 high-odd levels were found.

Transitions between these groups of levels account for 1,014 Re ii lines including about 70 percent of the total observed intensity. The ground state of Re+ is described by the spectral term 5d6 (o6 S)6s a7 S3

. 21 p. 28
RP2915. Density formula for alkali silicate glasses from

annealing to glass-processing temperatures,

L. W. Tilton An additive formula is given for the computation of

specific volumes of molten and compacted alkali silicate binary glasses with modifiers up to 50-mole percent and

from annealing temperatures (400° or 500° C) to 1,400° C. The effective partial volumes, i's, for the silica are postulated as (lM,)=2.198+»-mCs(1723-<), where rm is the mole fraction of nonsilica and Cs is a

constant to be evaluated from glass-density data. This is based on the idea that silica networks can contract in volume as temperatures are lowered provided, and in proportion as, modifier ions are present in the glass. The

effective partial volumes of R>0, the nonsilica, are assumed

as linear functions of temperature but not of the fraction

of silica present. Computed and observed densities agree within approxi- mately 1 percent. The effective volumes of nonsilica are somewhat smaller than published estimates for the oxides themselves, as should be expected because of interpenetrations. 5 p. RP2916. Thermodynamic properties of gases at high temperature: 1. Chemical equilibrium among

molecules, atoms, and atomic ions considered

as clusters, H. W. Woolley The equilibrium thermodynamic properties of gaseous

mixtures at high temperatures are treated by an extension

of the cluster theory of Ursell, omitting the assumption of additivity of pair energies. An effective^partition function

is introduced, which is a convenient function in expressing

the increase of the partition function for the entire gas due to the joining together of the parts of the cluster. The law of mass action and the dependence of second and

third virial coefficients upon the cluster integrals for pairs and triples of molecules in a mixture have been obtained

therefrom. Extension to a partially ionized gas is made

bv incorporating Mayer's cluster-based extension of the Debye-Hiickel theory. 22 p. RP2917. Parallel testing interferometer, J. B. Saunders The conventional methods of testing the parallelism of opaque bodies, such as gage blocks, by interferometry

require wringing of the body to an optical flat. This

operation disturbs the temperature equilibrium, necessitating long periods between tests, especially for long

blocks. It often injures the surfaces of both the optical

fiat and the test body. Also, if the body is a standard

gage block, repeated wringings during use ultimately change the dimension. This paper describes an inter- ferometer for measuring the parallelism of gage blocks and

other bodies of any reasonable length without the necessity

of the wringing operation. Two forms of this instrument

are used—one for testing long blocks and another for

testing short blocks. Either form can be constructed for testing blocks of any length, but two forms are found to be more practical. 8 p. RP2918. Correction for instrumental drift in flame photometry, B. W. Mulligan and A. F. Haught

The application of the principles of experimental design

to correct for drift in instrumental measurements, specifically in flame photometry, is described. Based on the procedure proposed by Youden, samples and reference standards may be measured in combinations of pairs in a manner such that errors caused by drift can be minimized and the actual amount of drift can be determined. Where

the drift is dependent on the magnitude of the quantity measured, grouping by magnitude prior to final measure- ment is necessary. Application of the procedure to flame photometric determination of alkali elements, under

conditions of severe drift, resulted in improving coefficients

of variation from an original range of 2.0 to 3.5 to a range

of 0.6 to 1.2. 3 p. RP2919. Mechanism of stress-corrosion cracking in the AZ31B magnesium alloy, H. L. Logan The mechanism of stress-corrosion cracking of annealed AZ31B magnesium alloy in an aqueous NaClK2 Cr04 solu- tion was investigated. Cracking was predominantly an

electrochemical process and was shown to be dependent

on the rate of strain in the specimen following loading in tension. It is postulated that cracks develop if the protective film on the metal surface is ruptured (over narrow

segments of the specimen) at a greater rate than it is repaired in the corroding medium. This would expose

film-free metal that is anodic to the filmed metal. 6 p. RP2920. Evaluation of lens distortion by visual and

photographic methods, F. E. Washer, W. P. Tayman, and W. R. Darling The evaluation of lens distortion by photographic and

visual methods is discussed. Measurements made on a

single lens using the two methods are reported. The

precision of measurement of each method is determined which shows that the observed differences must be attrib- uted to systematic error. Various sources of systematic

error are considered. Uncompensated differential plate tipping is identified as the most probable cause of the observed differences. A method of correction is developed.

It is concluded that when work is done with extreme care and with due account taken of various insidious sources of

error, it is possible to achieve comparable results with

either method. 7 p. TITLE PAGE AND CONTENTS TO VOLUME 61. 6p. RESEARCH PAPERS FROM JOURNAL OF RESEARCH OF THE NATIONAL BUREAU OF STANDARDS, VOLUME 62, JAN- UARY-JUNE 1959 RP2921. Heat of mixing of polybutadiene and benzene, R. S. Jessup Measurements have been made of the heat of mixing of polybutadiene and benzene at 26.9° C by means of a Bunsen-type calorimeter, in which diphenyl ether is the

calorimetric medium. The results of these measurements

can be represented by the empirical equation AH"= 12.0^2 , where AHM is heat of mixing in joules per cm3

, and vi and

v2 are volume fractions of solvent and polymer, respectively. The data have been combined with previously reported data on the_activity of the solvent in this system to obtain

values of ASU the partial molal entropy of dilution.- The

curve of ASi/Rv% versus v2 for this system lies above the

calculated curve of ASl/Rvl, where ASJ is the "configuartional entropy" of dilution, and also lies above the corre- sponding experimental curves for several other polymersolvent systems. 5 p. RP2922. Infrared high-resolution grating spectrometer, E. K. Plyler and L. R. Blaine An infrared grating spectrometer which can be used as a

single- or double-pass instrument has been built and set in operation. The collimating mirror has a focal length of 235 centimeters and the instrument has the highest resolu- tion from 1,600 to 3,500 cm-'. In order to have flexibilitv in scanning the spectra at different speeds, a special drive mechanism has been built which is made of spur gears and worm gears. The speeds range from 2.5 to 200 minutes

of time per degree of rotation. Examples of the spectra

resolved by the instrument are given. Lines separated by

0.05 cm-1 are completely resolved and two lines separated by 0.025 cm-1 are partially resolved. 3 p. 29
RP2923. Determination of titanium, zirconium, niobium, and tantalum in steels: separations by anion- exchange, J. L. Hague and L. A. Machlan A procedure is described for the determination of tita- nium, zirconium, niobium, and tantalum in steel. These

elements are concentrated by selective precipitation with

cupferron from a hydrochloric acid solution of the sample, and then ignited to the oxides. The oxides are fused, and

dissolved in a hydrochloric-hydrofluoric acid mixture. Three separate eluates, containing titanium and zirconium, niobium, and tantalum, result from elution with mixtures

containing ammonium chloride, hydrochloric acid, and

hydrofluoric acid from a column of Dowex-1 anion-ex- change resin. Boric acid is added to the eluates to complex

the hydrofluoric acid, and the elements are precipitated with cupferron. Titanium is determined by the hydrogenperoxide method, and zirconium by the phosphategravimetric method. Niobium and tantalum are deter- mined by the hydroquinone- and pyrogallol-photometric methods, or by weighing the oxides. 9 p. RP2924. Preparation of new solution standards of radium, W. B. Mann, L. L. Stockmann, W. J. Youden,

A. Schwebel, P. A. Mullen, and S. B. Garfinkel New radium-solution standards have been prepared in the ranges of 10 micrograms and also 10~e and 10~n gram

of radium element. These have been compared with the National Bureau of Standard's 1940 and 1947 series of radium-solution standards and, as a result of these comparisons, it has been found that the 1940 10-e and 10-11 - gram solution standards contained some 2 to 3 percent more radium element than certified. It has been shown

that this difference probably arose in the dilution of the 1940 standards. 6p. RP2925. Phase equilibrium relations in the binary system

lead oxide-niobium pentoxide, R. S. Roth The phase equilibrium diagram for the binary system

lead oxide-niobium pentoxide has been constructed from

observations of fusion characteristics and X-ray diffrac- tion data. The system contains six binary compounds

with PbO:Nb2 05 ratios of 3: 1, 5:2, 2: 1, 3:2, 1: 1, and 1:2. The compound PbONb2 06 was found to melt congruently

at 1,343° C and have a stable, reversible phase transfor- mation temperature from the low-temperature rhombohedral form to the high-temperature tetragonal form at 1,150° C. The 5:2, 2:1, and 1:2 compounds melt congruently at 1,220°, 1,233°, and 1,337° C, respectively; the 3:1 and 3:2 compounds melt incongruentlv at 985° and

1,233° C, respectively. 12 p. RP2926. Mass spectra of some deuterostyrenes, E. I. Quinn and F. L. Mohler Mass spectra of alpha, beta, and para deuterostyrene;

beta, beta dideuterostyrene; and alpha, beta, beta tri- deuterostyrene have been measured. The spectra are compared with the intensity distribution computed on

the assumption of a random distribution of deuterium in C8 H8 . This gives a fair approximation to the observed

spectra. The spectra of doubly charged styrenes are computed on the basis of observed half integer peaks in C8 H8 and C8 H7 D. The metastable transition peaks of the deuterostyrenes have been recorded. It is suggested that

ionized styrene molecules may form an octatetraene ring which dissociates with a random distribution of deuterium atoms but the observed spectra are not completely random

and there may be other modes of fragmentation. 4 p. RP2927. Heat of reaction of diborane with water and the heat of formation of boric oxide, E. J. Prosen, W. H. Johnson, and F. Y. Pergiel The heat of reaction of gaseous diborane with water to form gaseous hydrogen and a solution of boric acid (H3BO3+ l,000H2 O) has been measured by passing gaseous diborane through two successive bubblers in a calo- rimeter. The heat of the reaction obtained was: AH298 . 15 =-466.34±2.23 kj/mole (-111.46 ±0.54 kcal/ mole)

Combination of this value with values previously re- ported for the heat of decomposition of diborane and the heat of solution of boric oxide yields the following value

for the heat of formation of crystalline boric oxide from amorphous boron and gaseous oxygen: AHf298 . 15 =- 1280.89 ±3.14 kj/mole (-306.14 ±0.75

kcal/mole). 5 p. RP2928. Heat of formation of titanium tetrachloride, W.

H. Johnson, R. A. Nelson, and E. J. Prosen The heat of formation of gaseous titanium tetrachloride has been measured by the reaction of metallic titanium with gaseous chlorine in a calorimeter. The value for the heat of formation obtained in this investigation corre- sponds to the reaction: Ti ((:) + 2Cl2U, = TiCl4( e), AHf°(25° C) = - 763.2 ±2.9 kj/mole (-182.4 ±0.7 kcl/ mole).

Earlier data are discussed briefly. 4 p. RP2929. Determination of niobium and tantalum in ti- tanium-base alloys, J. L. Hague and L. A. Machlan A procedure for the determination of niobium and tanta- lum in titanium-base alloys is described. The sample is dissolved in a mixture of hydrochloric and hydrofluoric

acid, and oxidized with a minimum of nitric acid. The

resulting solution is transferred to a column containing a strong quaternary amine anion-exchange resin (Dowex-1). Titanium and other alloying elements, except niobium and

tantalum, are removed by elution with an ammonium

chloride-hydrochloric-hydrofluoric acid solution. Nio- bium is removed by elution with an ammonium chloride- hydrofluoric acid solution. Tantalum is collected in a separate eluate of slightly acid ammonium chloride-am- monium fluoride solution. Boric acid is added to complex

the fluoride, the earths acids precipitated with cupferron,

ignited to the pentoxides, and weighed. 5 p. RP2930. Properties of zinc borosilicate glasses, E. H.

Hamilton, R. M. Waxier, and J. M. Nivert, Jr. The glass-forming region of the system ZnO-B2 03-Si0 2 was surveyed. Glasses were made with compositions

within the following limits in mole percent: 50 to 62.5 ZnO,

20 to 43.5 B2 03 , and 0 to 20 Si0 2 . They can be melted and poured below 1,400° C. The glasses have low coefficients of thermal expansion, high values of elastic moduli and Poisson's ratio, and refractive indices from 1.6409 to

1.6798. 4 p. RP2931. Design and performance of a block-type osmometer, D. Mclntyre, G. C. Doderer, and J. H. O'Mara A block-type osmometer has been designed and constructed utilizing several new features which enhance the

precision of the osmotic-pressure measurement and allow simpler manipulative techniques. The details of the construction as well as a discussion of the design and per- formance of this osmometer are included in the paper. 4 p. RP2932. Heat of formation of titanium tetrabromide, R. A. Nelson, W. H. Johnson, and E. J. Prosen The heat of formation of solid titanium tetrabromide has been measured by the reaction of titanium metal with 30
gaseous bromine in a calorimeter. The following value for the heat of reaction was obtained: Ti(c)+2Br2 (g)=TiBr4 (c) -678.16±4.60 kj/mole (- 162.08± 1.10 kcal/mole). Combination of this value with the heat of vaporization

of bromine vields the standard heat of formation of TiBr4 (c) from Ti(c) and Br2 (liq) as AHf0 (25° C) =

- 616.72 ±4.60kj/mole (- 147.40± 1.10 kcal/mole). 3 p. RP2933. Adsorption of polyesters on glass, silica, and

alumina, R. R. Stromberg, A. R. Quasius, S. D.

Toner, and M. S. Parker The adsorption of several saturated linear polyesters has been studied under a variety of conditions. The study

also included di-n-butyl sebacate as a model low molecular weight ester and poly (methyl methacrylate) . The adsorbents were type E glass powder, silica, and alumina. The glass powder and silica were nonporous materials; the alumina contained a large internal pore structure. The rate of adsorption of the polyesters on glass was very

rapid and the adsorpt on isotherm was irreversible. Adsorption from a poor solvent was favored over adsorption from a good solvent. A large number of sites are available on the adsorbent for bond formation and the adsorbed polymer most probably extends into the solution in a

coiled configuration. Metallic ions, in addition to silicon, appear to be involved in an electrostatic bond between the polymer and the glass. The Langmuir equation is obeyed

at high-equilibrium concentrations, although there is nonconformity at the low concentrations. 7 p. RP2934. Theory of the effect of drag on the orbital incli- nation of an earth satellite, J. P. Vinti The rotation of the earth's atmosphere with the earth

gives rise to a change in the inclination of the orbit of an

earth satellite. In this paper it is assumed that the drag is in the direction of the air velocity relative to the satellite and that its magnitude diminishes so rapidly with altitude that it is appreciable only near perigee in an elliptic orbit. Without further assumptions about the properties of the drag function, results are then deduced for the secular changes in inclination up to, but not including, the final

ballistic stage of motion. 10 p. RP2935. On a theorem of M. Riesz, M. Pearl The structure of the set of skew-symmetric, orthogonal

matrices of order 4 with elements in the real field is studied. The first and second regular representations of the quaternions are used to represent these matrices and known

properties of the quaternions are exploited to obtain

characterizations of the skew-symmetric matrices. In the second part of this paper, the underlying structure of the geometry is changed from the Euclidean to the Lorentzian.

It is then shown that there are no skew-symmetric, orthogonal (in the Lorentzian sense) matrices of order 4. 6 p. RP2936. Refinement of the crystal structure of triclinic magnesium pyroborate, S. Block, G. Burley,

A. Perloff, and R. D. Mason, Jr. The triclinic modification of Mg2 B2 06 was classified as a member of an isostructural series which also includes Mn2 B2 05 ,Fe2 B2 06 , and Co2 B2 05 . The crystal structure was

refined by the use of successive Fourier projections and

a least-squares refinement program on an electronic computer. The structure of Mg2 B2 05 consists of B2 06 -4 groups and Mg+2 ions. Each magnesium atom is sur- rounded octahedrally by six oxygen atoms, forming an

extended sheet of octahedra. The pyroborate groups

share corners with octahedra in the sheets and thus link them. Each boron atom is in planar triangular coordination with three oxygen atoms. The pyroborate group

has two such triangles with one shared oxygen. The

angle between the planes formed by the triangles is 16°. The average boron-to-oxygen distance is 1.38 A. 6 p RP2937. Heat transfer in laminar flow through a tube, M. Abramowitz, W. F. Cahill, and C. Wade, Jr. The problem of heat transfer due to laminar flow of a viscous fluid in a channel is studied under the assumption

that there is a parabolic distribution of velocity. The

effect of axial temperature changes are considered and

the solution is based on the simpler situation where axial

effects are discussed. The solution, obtained by the method of least squares, is represented in terms of a set

of nonorthogonal characteristic functions. These functions and the corresponding characteristic values are determined by numerical integration employing the Runge-Kutta procedure. Finally, asymptotic develop- ments are obtained which are useful in the limiting cases. 5 p. RP2938. Fluorination of haloaromatic compounds, R. E.

Florin, W. J. Pummer, and L. A. Wall The reactions of BrF3 , C1F3 , and IF5 with C6 C1,, C6 Brs , C6CI5-CF3, and other haloaromatic compounds are

described. These reactions are not readily controlled, and explosions frequently occurred, particularly when BrF3 and C1F3 were used. Dehalogenation of the reaction products led to certain aromatic fluorocarbons, for example, CCIF5 and CeClF4-CF3 . Completely fluorinated aro- matic compounds were not easily obtained, and therefore the process is not recommended for the production of these species. 6 p. RP2939. Synthesis of some disubstituted 3,4,5,6-tetra- fluorobenzenes, W. J. Pummer, R. E. Florin, and L. A. Wall The preparation of 1,2,3,4-tetrafluorobenzene from

2-chloroheptafluorotoluene in a two-step synthesis is described. A new method for the hydrolysis of the

trifluoromethyl group was developed using alumina and

steam at high temperatures. The products obtained from the hydrolysis of 2-chloroheptafluorotoluene were

2-chloro-3,4,5,6-tetrafluorobenzoyl fluoride and 2,3,4,5- tetrafluorochlorobenzene, the decarboxylated product. The latter compound was converted to 1,2,3,4-tetra- fluorobenzene by reduction with hydrogen and palladium

at 280° C and atmospheric pressure. Some of the new

compounds prepared, in addition to those mentioned

previously, include 2-chloro-3,4,5,6-tetrafluorobenzoic acid, 2-chloro-3,4,5,6-tetrafluoroiodobenzene, and 1,2-diiodo- 3,4,5,6-tetrafluorobenzene. 5 p. RP2940. Reactions of aromatic fluorocarbons with hydrogen, R. E. Florin, W. J. Pummer, and L. A. Wall

Various palladium and platinum catalysts were used

to effect the following hydrogenation reactions at relatively high conversions and yields: C6F4 C1H C6 F4 H2 280° C„F4 C1C F3 C6 F4 HCF3 280° C«F6 C6 F6 H, C6 F4 H2 300°

Nickel could be used for some of the reactions, but with much greater difficulty. The products of these reactions can be iodinated and brominated, and hence are a starting 31
point for the synthesis of many new derivatives of aromatic

fluorocarbons. 4 p. RP2941. Exponential integral e-xtl-"dt for large values

of n, W. Gautschi An asymptotic expansion is given which is well suited

for numerical computation when n is large and x arbitrary

positive. 3 p. RP2942. Effect of oxygen on the bonding of gold to fused

silica, D. G. Moore and H. R. Thornton

Gold pellets were melted on plaques of polished fused

silica in vacuum and then heated for 15 minutes at 1,100° C

under different oxygen pressures. The force required at room temperature to shear the solidified pellets from the

silica surface was found to vary from zero for gold melted

in vacuum to 725 pounds per square inch for gold melted under an oxygen pressure of 150 millimeters of mercury.

In all cases where bond developed, fracture occurred in the

silica rather than at the gold-silica interface. Silica plaques with pellets bonded to them by treatment in oxygen showed

no measurable strain when examined with a polarograph,

suggesting that the gold had yielded as the specimen cooled. Tests using Aum as a tracer indicated that gold diffused into the silica lattice at high oxygen pressure but that no

diffusion occurred during vacuum heating. Observations made on molten droplets showed no correlation between

the contact angles in air and vacuum and the apparent

shear strengths. A possible explanation is included to account for this lack of agreement with theory. 9 p. RP2943. Interferometer for large surfaces, J. B. Saunders and F. L. Gross An interferometer is described that permits the testing

of large areas, such as layout plates. The extension to

large areas is obtained by causing a collimated beam of

light to reflect from the specimen at a large angle of incidence. The resultant fringe pattern is a contour map

of the surface relative to an arbitrarily chosen plane and

the contour interval is a function of wavelength and angle

of incidence. 3 p. RP2944. Glass formation in polymers: II. The system

rubber-sulfur, G. M. Martin and L. Mandelkern Volume versus temperature relations encompassing a wide range in temperature and composition have been determined for a series of natural rubber-sulfur vulcanizates and mixtures. The characteristic temperature of glass formation is deduced from these studies. The glass temperature is found to increase continuously from —69°

to +90° C in the vulcanizates as the amount of bound

sulfur is increased and to be invariant with the composition

in the mixtures. A qualitative interpretation of these

results is given in terms of the free-volume theory of glass formation. 6 p. RP2945. Elastic deformations in strips with holes loaded through pins, M. Chi and L. K. Irwin

Bickley's solution for the generalized plane stress in a

plate loaded through a pin is extended to give the deformation at any point in a plate loaded through one or two pins which are on the same load line. Analytical expressions

are derived that are known to apply to a finite strip with

a width >14a and distance between holes >8a, where a is the radius of the hole. Numerical examples are developed and presented in the form of graphs for typical cases. 5 p. RP2946. Absolute light-scattering photometer: I. Design and operation, D. Mclntyre and G. C. Doderer A new light-scattering photometer has been designed and built for determining the absolute scattering from

polymer solutions. The instrument is also capable of performing as a research instrument for making measure- ments at very low and very high angles, and at very low and very high intensities of scattered light. The instru- ment scans the angular scattering either manually or automatically while measuring continuously the ratio of the scattered light to the incident light. 7 p. RP2947. Resolution of the dissociation constants of d,l- malic acid from 0° to 50° C, M. Eden and

R. G. Bates A method for the precise determination of the dissocia- tion constants for the two overlapping dissociation steps

of a weak dibasic acid from the same set of experimental data is described. The procedure, based on an earlier suggestion of Speakman (J. Chem. Soc. 1940, 855), is applied

to the resolution of the thermodynamic dissociation constants of d,e-malic acid at intervals of five degrees from 0°

to 50° C. The constants were derived from measurements

of the electromotive force of cells of the type

Pt; H2 (g), malate buffer solution, KCl(m= 0.008), AgCl; Ag. The 39 buffer solutions were prepared from potassium hydrogen malate and from mixtures of potassium hydro- gen malate with perchloric acid or potassium hydroxide, and each contained potassium chloride. The first association constant, Ku is 3.48X10-4 at 25° C. It is given as a function of absolute temperature (T) by -log Kt =

° -5.1382 +0.0135507\ The second constant, K2 , is 7.99 X10~6 at 25° C. It is given by -log K2 = °jV -6.2364 + 0.019353T. The thermodynamic quantities AG°, AH°, AS°, and ACV

° related to each dissociation step were computed and compared with the corresponding constants for other acids

closely related structurally to malic acid. 10 p. RP2948. Capacity requirement of a mail sorting device, B. K. Bender and A. J. Goldman A mathematical model of a sorting device suggested by S. Henig is considered. The relevant parameters are

r (the number of destinations for the mail) and k (the number of letters entering the device during each cycle

of operation). It is shown that the device will never jam

if its capacity is at least (r— 1) (k— 1) + k letters; this is the lowest possible capacity requirement, and for realistic values of r and k is significantly less than the previously known estimate r

2 k. 3 p. RP2949. Effect of internal radiant heat transfer on teirn perature distribution, thermal stress, and deflection in box beams, S. Goodman, S. B. Russell, and C. E. Noble

Thirteen box beams were analyzed to determine the

effect of internal radiant heat transfer on temperature dis- tribution, thermal stress, and deflection. A rough experi- mental check of temperature distribution and beam deflec- tion was made for one case. For maximum beam temperatures above 700° to 900° F, change in emittance of the

interior surfaces of the beam had an appreciable effect on the cover (but not the web) temperatures and to an

even greater extent, on the beam deflection. At maximum

beam temperatures of 1,200° F, an increase in interior surface emittance appreciably relieved the maximum ther- mal stress. 7 p. 32
RP2950. Mean absolute value and standard deviation of the phase of a constant vector plus a Rayleighdistributed vector, J. R. Johler and L. C. Walters The mean absolute value of the phase and the standard

deviation of the phase of a constant vector plus a Rayleighdistributed vector are determined by an evaluation of the

first and second moment integrals of the probability dis- tribution for various values of average relative intensity

of the random Rayleigh-distributed component. The

results of a quadrature evaluation of the integrals are tabulated over a wide range of values of average relative intensity (A- 2 = 0.010 to 1,000). 4 p. RP2951. Simple rotating molecular still, G. S. Ross and

L. J. Frolen A simple molecular still has been designed to purify

materials which have a low vapor pressure and which are thermally unstable. The apparatus contains no ground

glass joints and the distillation is accomplished in a completely closed system. The efficiency of the still was found

to be "better than that for either the pot-type or the falling film-type molecular stills generally used. 1 p. RP2952. Scintillation counter method of intercomparing neutron source strengths by means of a manganous sulfate bath, E. R. Mosburg, Jr.

It has proved feasible to use a scintillation counter to measure the relative activity of a large manganous sulfate bath, thereby determining the neutron-emission rates of neutron sources relative to the national standard neutron

source of the National Bureau of Standards. A scintilla- tion counter allows the calibration of sources weaker by a

factor of seven than those it was previously possible to

calibrate by means of a Geiger-Muller counter. The use

of Cs 137 as a reference pulse height to which the scintilla- tion counter system is adjusted by means of a two channel

pulse height analyzer makes possible the reliable repro- duction of results from day to day. By using the scintilla- tion counter the ratio of the national reference standard

neutron source (NBS-II) to the national standard neutron

source (NBS-I) has been redetermined and is found to be

0.9393 ±0.0017 . 3 p. RP2953. Phase equilibria in the subsystem barium disili- cate—dibarium trisilicate, R. S. Roth and E. M. Levin A revised phase equilibrium diagram for the subsvstem BaO-2Si02—2BaO-3Si02 is presented. The previously published diagram showing a complete solid solution series was not verified. Instead, two new compounds were

identified by X-ray diffraction powder pattern techniques, and two eutectics were located by the quenching method. The compound 3BaO-5Si02 melts incongruently at 1,423° C to form 5BaO-8Si02 and liquid. The latter compound

melts congruently at 1,446° C. Barium disilicate was

found to have a quenchable and slowly reversible phase

transformation at about 1,350° C. The X-ray diffraction powder pattern for 2BaO-3Si02 was indexed for the first time on the basis of a monoclinic unit cell. 8 p. RP2954. Separation and determination of phosphate, sili- cate, and arsenate, W. S. Clabaugh and A. Jackson A method was developed for quantitatively separating and determining phosphate, silicate, and arsenate when

they occur together in solution. All three, at a pH of 1.8, form heteropoly molybdate complexes when heated just

to boiling. Only the phosphate complex is extracted into ether from a solution that contains one volume of concentrated hydrochloric acid plus nine volumes of solution. After removing the phosphate, only the silicate complex is extracted into butanol from a solution that contains two

volumes of concentrated hydrochloric acid plus nine volumes of solution. The arsenate complex is then extracted

into methy isobutyl ketone after readjusting the aciditv back to 1 + 9 by adding silica-free ammonium hydroxide. The various complexes are reduced by adding 'stannous

chloride to the organic solvent and determined spectro- photometrically. The effect of various salts on the complex formation and the extraction is also reported. 5 p. RP2955. Heat of formation of potassium calcium silicate, E. S. Newman

The heats of solution of 2CaO-Si02 (c, 0), CaS04 (C, anhydrite), K2 S04 (C, II) and six members of a series of substitutional solid solutions of K2 0 in dicalcium silicate were determined in a nitric-hydrofluoric acid mixture by means of an isothermal-jacket calorimeter. From these data and heats of formation taken from the literature, the heat of formation of K2 0-23CaOl2Si02 (c) was calculated to be —6,420 kilocalories per mole at 25° C. 5 p. RP2956. Heat of formation of boron trichloride, W. H.

Johnson, R. G. Miller, and E. J. Prosen The heat of formation of gaseous boron trichloride has been determined by the direct reaction of gaseous chlorine with amorphous boron in a calorimeter. B(amorph) + 3/2 Cl2 (gas) = BCl3 (gas) AHf°(25° C)= -407.98 ±1.34 kj/mole (-97.51 ±0.32 kcal/mole). By utilizing the values previously reported for the heats

of formation of boric acid, diborane, and pentaborane, the heat of hydrolysis of boron trichloride and the heats of reaction of diborane and pentaborane with chlorine have

been obtained. By the use of an estimated value for the heat of sublimation of boron, the average bond energy of the B-Cl bond in boron trichloride is found to be 105.2

kcal at 0° K. The data on the heats of formation of diborane, boric oxide, boric acid, and boron trichloride now form a consistent set of values. 5 p. RP2957. Thermal degradation of polymers at low rates,

S. L. Madorsky

In measuring the rates of thermal degradation of poly- mers at constant temperatures in the range of 200° to 500° C, one encounters a distortion of the initial parts of the rate curves during the time required to heat the speci- men to the pyrolysis temperature. This distortion has been largely overcome by using a new apparatus, based on an electronic balance, in which the degradation of the specimen is carried out at very low rates. The apparatus

is equipped with an electronic thermostat that controls the temperature to within ±0.1° C, and also with an

automatic recorder that measures both the temperature and the loss of weight of the specimen. Pyrolysis experi- ments were carried out in a vacuum in this apparatus on

pure specimens of polystyrene, poly (a-methylstyrene)

polymethylene, high-molecular-weight polyethylene, and

low-molecular-weight polyethylene. The initial rates of degradation, in percent of sample per minute, varied from

0.008 to 0.095. Except for the initial parts of the rate

curves, in some cases up to about 30 percent loss of weight, the rate curves at low rates resemble closely those previ- ously obtained at high rates of degradation. 10 p. RP2958. Pits in metals caused by collision with liquid drops and soft metal spheres, 0. G. Engel An equation is developed to give pit depth as a function

of collision velocity for pits formed in soft to medium-hard

metal plates as a result of collision with liquid drops. The rear face of the target plate must be a free surface. The plate thickness must not be less than 1.5 to 2.0 times

the drop diameter nor greater than 4 to 5 times the drop

diameter. It is shown that, under the same conditions on

33
the target plate, the equation is also applicable to pits formed in soft to medium hard metal plates as a result of

collision with spheres of the same metal that flow radially as a result of the collision. Pit-depth-versus-velocity data

obtained in other laboratories were used to test the equation. Metals used as targets were copper, 1100-0 alu- minum, 2024-0 aluminum, lead, steel, soft iron, and zinc. Mercury was used as the drop liquid against copper, aluminum, lead, and steel. Water was used as the drop

liquid against copper, aluminum, and lead. Spheres of copper, aluminum, lead, soft iron, and zinc were used

against targets of the same materials, respectively. The

equation can be used to calculate the dynamic compressive

yield strength of soft to medium-hard metals. 18 p. RP2959. Earth currents near a monopole antenna with symmetrical top loading, J. R. Wait

Expressions for the fields are developed for a vertical ground-based monopole with a cone or disk located at the top of the antenna to simulate umbrella top loading. The current distribution on the structure is assumed. Using spherical-wave functions, the magnetic-field distri- bution on the ground plane near the base of the antenna

is computed and illustrated by graphs. For the case where the antenna is electrically small, the currents flowing on the cone or disk are shown to contribute only slightly to the total field. 9 p. RP2960. Infrared absorption spectra of some cyclic acetals

of sugars, R. S. Tipson, H. S. Isbell, and J. E. Stewart The infrared absorption spectra of twenty-eight 1-meth"

oxyethylidene and isopropylidene acetals of sugars have

been recorded and analyzed. The formulas of the compounds were grouped according to structure, and the absorption bands for each group were considered in relation to the bands found for the other structurally related compounds. No bands were found for the unequivocal

detection of the 1,3-dioxolane ring attached respectively

to an aldopentofuranose or a ketopentofuranose, an aldo- pentopyranose, an aldohexofuranose, an aldohexopyranose

or a ketohexopyranose, a uronic acid salt or lactone, a sugar alcohol, or a sugar keto-acid salt. Regardless of the fine structure of the dioxolane compounds, certain strong bands were observed, but the bands are not easily recognized from an inspection of one or two spectra and

are not characteristic of these compounds only. 26 p. RP2961. Earth currents near a top-loaded monopole

antenna with special regard to electrically small L- and T-antennas, H. L. Knudsen An investigation has been made of the ground currents near a top-loaded monopole with nonazimuthal symmetry.

Formulas have been developed for the surface current

density produced by an inclined, straight wire over a

horizontal ground plane for an arbitrary current distribu- tion on the antenna. Working formulas have been devel- oped and numerical calculations of the surface current

density on the ground plane have been carried out for the case of a small antenna with a linear current distribution. These results have been used for the calculation of the contribution to the surface current density due to the top loading in the case of an L-antenna and in the case of a T-antenna. In each case both the absolute value of the

surface current density arising from the top loading and

the relative value of its </>-component have been plotted,

as it may be expected that this component under certain circumstances may be important in calculating the ground

losses in the case of a system of radial ground wires. 14 p. TITLE PAGE AND CONTENTS TO VOLUME 62. 5 p.

3.2 PAPERS FROM THE JOURNAL OF RESEARCH OF THE

NATIONAL BUREAU OF STANDARDS, SECTION A. PHYSICS AND CHEMISTRY, VOLUME 63A, JULY—DECEMBER 1959 July-August 1959 Description and analysis of the first spectrum of iodine, C. C. Kiess and C. H. Corliss An extensive survey of the spectra of iodine has led to a list of more than 900 lines emitted by neutral atoms in the region from 23070 A in the infrared to 1195 A in the extreme ultraviolet. Wavelengths between 12304 A and

2061 A were derived from measurements of spectrograms

obtained with gratings of high dispersion. Wavelengths

of lines outside these limits are the computed values for

lines observed on photometric tracings of the infrared, inaccessible to photography, and in the ultraviolet with a vacuum-grating spectrograph. For many of the lines Zeeman patterns were obtained in a magnetic field of about 37,000 oersteds. With these data many of the lines have been classified as combinations between odd levels from the electron configurations 5s2 5p4 np and 5s2 5p* nf, and even levels from the configurations 5s2 ns and 5s2 5p4 nd. Among these levels several sets have been recognized as form- ingRydberg sequences that are in close agreement in placing the ground state 5p6 2 ~P°h of I i at 84,340 cnr1 below the ground state bp* 3 P2 of I n. This gives 10.45 electronvolts for the ionization potential of the neutral iodine atom. A strong infrared line at 13148.8 A is explained

as a magnetic dipole transition between the levels of the ground term 5p5 2 P°. 18 p. CH in the solar spectrum, C. E. Moore and H. P. Broida CH lines in the solar spectrum have been identified by

direct comparison of measured laboratory and solar wavelengths and intensities. The comparisons of individual

rotational lines are included in a series of tables arranged

according to electronic and vibrational transitions. 35 p. Infrared studies in the 1- to 15-micron region to 30,000 atmospheres, C. E. Weir, E. R. Lippincott, A. Van

Valkenburg, and E. N. Bunting A pressure cell was constructed using a pair of type II diamonds for study of infrared spectra of solids in the

1- to 15-micron region. Using commercial infrared equip- ment, spectra can be studied routinely to calculated pres- sures as high as 30,000 atmospheres. Under pressure, bands generally shift to higher frequencies and decrease

in intensity. The magnitude of both changes depends

on the mode of vibration. Occasionally major changes in spectra occur. In calcite the carbon-oxygen symmetric

stretching, mode vu becomes active at elevated pressures while the doubly degenerate v3 , stretching, and bending,

frequencies split. From the shift in frequency of v\ with

pressure the "compressibility", [(— 1/R0) (dR/dp)], of the C—O bond length, R, is calculated to be 2.8X 10-7 /atmosphere. Major spectral changes are not observed in the same pressure ranges in other carbonates having the cal- cite or aragonite structures. The results for calcite may be explained by a shift of the COr ion from the trigonal axis under pressure. 8 p. Phosphinoborine compounds: mass spectra and pyrolysis, L. A. Wall, S. Straus, R. E. Florin, F. L. Mohler, and

P. Bradt The mass spectra of tetramethylphosphinoborine trimer, [P(CH,),B(CH„) 2 ] 3 (I) and a compound, PS (CH,),B8 H,> (II) prepared from dimethylphosphinoborine were observed and the compounds were pyrolyzed at 300 to 500° C. Most peaks in the spectrum of (I) came from the P—B. B—C, and P—C cleavages. The mass spectrum of (II) was much more complicated with evidence for methyl

group redistribution.

34
i The pyrolysis of both compounds indicates a very complicated mechanism with many unidentifiable compounds.

Trends in the formation of volatile products indicate that both compounds are completely decomposed in 4 hr at 450° C. Compound (I) produces trimethylboron, which

' disappears rapidly above 400° C. Neither (I) nor (II) formed ethane or elemental phosphorus. 4 p. Experimental and theoretical study of kinetics of bulk

crystallization in poly(chlorotrifluoroethylene), J. D.

Hoffman, J. J. Weeks,'and W. M. Murphey

The rate of isothermal bulk crystallization of polytchlorotrifluoroethylene), Tm = 22\° C, was measured

from 170° to 200° C. The intrinsic bulk crystallization, which accurately followed an n = 2 law, was shown to be

a result of the injection of primary nuclei sporadically in time, with one-dimensional growth of centers derived from

these nuclei. The crystallites are exceedingly small. The one-dimensional growth process was isolated by

nucleating specimens with seed crystals, and its temperature-dependence determined between 191° and 205° C. The seed crystal isotherms followed an n = 1 law. The

temperature coefficients of the rate of nucleation and the

rate of growth were both strongly negative. A theory of homogeneous nucleation that takes into account the segmental character of the polymer chains

is developed in some detail. A cylindrical nucleus is assumed. In the temperature range near the melting

point, region A, where the radius and length of the nucleus

are unrestricted, the rate of nucleation is shown to be

proportional to ex,p( — a/T'AT2 ). The nucleation rate is proportional to exp( — p/T2 AT) in region B, which extends from somewhat below the melting point to considerably

lower temperatures; the length of the nucleus has a

constant value in this region, but the radius is unrestricted. (In the above expressions, a and /3 are constants). Finally, at sufficiently low temperatures, region C is entered. Under certain circumstances, the rate of nucleation in region C will be extremely rapid, and corre- spond to a "nucleative collapse" of the supercooled liquid

state. A calculation of the one-dimensional growth rate shows that it is proportional to exp( —y/T'MT) where 0=y.A careful analysis of the experimental data obtained between 170° and 200° C clearly showed that both the

rate of nucleation and the rate of growth were proportional to exp(-/3/T2 AT), and not exp(-a/T3 AT2

) . The

primary nucleation event was thus of type B in this interval. A detailed analysis of the data is given, and surface free energies and the dimensions of the nuclei quoted. Quenching experiments, where the polymer was crystallized well below 170° C, gave a firm indication of the exist- ence of region C. An experimental study was made of the extremely slow

crystallization process that prevailed when the degree of crystallinity became high. The onset of this stage of the

crystallization was interpreted as being the result of a massive degree of impingement. This interpretation is justified by the calculations of Lauritzen, who has given a

theory of impingements that predicts a pseudoequilibrium

degree of crystallinity. As indicated above, the growth process originating at homogeneous nuclei is not of a three-dimensional or

spherulitic character in the region of study. Such stray

spherulites as do appear in this region are shown to

originate at heterogeneities. The possibility that the

intrinsic growth process may become three-dimensional at

crystallization temperatures sufficiently near Tm is discussed. 32 p.

September-October 1950 Reflection of fast neutrons from water, M. J. Berger and

J. W. Cooper The backscattering of fast (0.3, 1, 3, 6, 9, and 14 Mev)

neutrons from a semi-infinite water medium has been

calculated by the Monte Carlo method. The information obtained includes the joint angular and spectral dis- tribution of the reflected neutrons, the dependence of the number albedo and energy albedo on the source energy and obliquity, and the contributions to the albedo of successive orders of scattering. The spectra were calcu- lated down to epithermal energies (~0.5 ev). The

results for each case are based on the analysis of 3,000 neutron histories, generated with the use of an IBM-704

computer. In the random sampling, elastic scattering from hydrogen and oxygen, inelastic scattering from

oxygen, and absorption due to n-a and n-p processes were

taken into account. The cross sections for some of these

interactions are not well known. Parallel calculations with different assumptions about the cross sections were made in order to estimate how sensitively the albedo depends on the cross sections. The paper includes a self- contained description of the Monte Carlo method, its application to the calculation of radiation diffusion and in particular to the neutron albedo problem. Emphasis is placed on the technique of correlated sampling which makes possible an accurate estimate of albedo differences resulting from different assumptions about the cross sections. The random sampling computations were supple- mented by analytical calculations of the single-scattering albedo. This was useful for an understanding of the Monte Carlo results because a considerable fraction of the reflected neutrons return after onlv one collision. 44 p. Some vibrational-rotational bands of deuterated methanes, H. C. Allen, Jr., and E. K. Plyler A parallel band at 2,200 cm-1 and a perpendicular band

at 2,780 cm-1 of CH3 D have been observed under high

resolution and analysed. The analysis of the perpendicular band revealed the presence of 1-type doubling in the doubly degenerate excited state. From the analysis

of the parallel band it is found that B0 = 3.880 cm-1

. A

hybrid band of CD3 H has been observed near 2,600 cm-1. Both active components, A and E are observed and analysed. The ground state B0 value found from this analysis

is in good agreement with previous determinations. 8 p. Precise coulometric titration of acids and bases, J. K.

Taylor and S. W. Smith

Apparatus and techniques are described for the titra- tion of acids and bases by constant-current coulometry. The precision and accuracy of the method are indicated by titrations of benzoic acid, potassium acid phthalate,

adipic acid, hydrochloric acid, and sodium carbonate. Standard deviations of ±0.003 percent have been obtained which indicate that the reliability of the method is equal

to or exceeds that of classical analytical procedures. 7 p Heat of formation of titanium tetraiodide, W. H. Johnson,

A. A. Gilliland, and E. J. Prosen The heat of formation of titanium tetraiodide was

determined relative to that of titanium tetrabromide by

comparison of their heats of hydrolysis in dilute sulfuric

acid. The difference in the heats of formation may be

expressed by the equation:

TiI4 (c)+2Br2 (liq) = TiBr4 (c) + 2I2 (c), Aff(25° C) = -230.91 ±0.75 kj/mole (-55.19 ±0.18 kcal/mole). By taking the heat of formation of TiBr4 (c) as -616.72

±4.60 kj/mole, the heat of formation of Til4 (c) is cal- culated to be -385.81 ±4.64 kj/mole (-91.21 ±1.11

kcal/mole). The heats of hydrolysis of TiBr4 and TiCl4 were similarly measured; the Value obtained for the differ- ence (186. 77± 1.34 kj/mole) is in good agreement with the

difference between the directly determined heats of for- mation (187.11 ±5.35 kj/mole). 6 p. 35
Reactions of pentafluorohalobenzenes, W. J. Plummer and

L. A. Wall Both pentafluorobromobenzene and pentafluoroiodo- benzene are reactive intermediates and can be used to introduce the perfluorophenyl (C5 F6—) group into a variety

of new compounds. The chief methods used are the Grignard coupling or addition reaction as well as the Ullmann condensation reaction. Some of the new compounds prepared were pentafluorobenzonitrile, perfluoro- diphenyl, pentafluorophenyl-a-ethanol, and pentafluorostyrene. 3 p. Tritium-labeled compounds I. Radioassay of tritium- labeled compounds in "infinitely thick" films with a windowless, gas-flow, proportional counter, H. S. Isbell, H. L. Frush, and R. A. Peterson A simple, sensitive, and reliable technique has been

devised for the radioassay of nonvolatile, water-soluble tritium compounds. The substance to be analyzed is dissolved in an aqueous solution of a thickening agent, preferably sodium O-(carboxymethvl) cellulose or sodium

alginate. The solution is placed in a shallow planchet, and after evaporation of the water, the resulting film, which is "infinitely thick" to tritium beta particles, is counted with a 2tt, windowless, gas-flow, proportional

counter. By means of an empirical factor, determined

with a substance of known radioactivitv, the counts are converted to microcuries. In a film having a thickness of

0.7 mg/cm 2

, the counting efficiency is about 4 percent; the standard deviation from the mean, obtained in a

series of routine measurements, was less than 2 percent. An assay can readily be made with tritium-containing

material having 0.01 microcurie of radioactivity. The

method, which is applicable to nonvolatile, water-soluble

solids, solutions, or liquids, is suitable for routine analvses.

5 p. Tritium-labeled compounds II. General-purpose apparatus, and procedures for the preparation, analysis, and

use of tritium oxide and tritium-labeled lithium borohydride, H. S. Isbell and J. D. Mover A general-purpose manifold is described, which is useful

for numerous procedures involving tritium gas and tritium- labeled materials. Methods are given in detail for (a) converting tritium

gas to tritium oxide, (b) preparing tritium-labeled lithium borohydride, and (c) conducting a variety of reactions in a closed system. Auxiliary equipment is shown, including water traps, reaction flasks, and apparatus for preparing

solutions and making nitrations in closed systems. Methods are presented for assaying tritium-labeled water by

(a) dissolving it in a phosphoric anhydride-sulfuric acid

solution and counting in a windowless, gas-flow, proportional counter, or (b) converting it to hydrogen-^ and

assaying it in an ionization chamber. The use of tritium- labeled lithium borohydride is illustrated by the preparation of D-galactitol-/-< from D-galactose. Subsequent

papers will describe the use of this apparatus in the synthesis of tritium-labeled carbohydrates. The detailed

description of techniques and apparatus should be helpful

to others who are interested in using tritium. 7 p. Preparation of trichloride and tetrachloride of molyb- denum, D. E. Couch and A. Brenner Molybdenum trichloride was successfully prepared in quantity by the reduction of molybdenum pentachloride with hydrogen. The most satisfactory yields were

obtained with a 4 to 5 mole excess of hydrogen at pressures

of 100 psi or higher and at a temperature of 125° C. Molybdenum tetrachloride was prepared by direct reaction of molybdenum trichloride with molybdenum

pentachloride in a sealed tube or steel bomb maintained

at 250° C. X-ray patterns of the various chlorides were

obtained. 4 p. 36

Infrared spectra of asphalts, B. D. Beitchman A procedure for preparing thin films of airblown asphalts1 ' and a spectroscopic study of such films throughout the.' infrared region of 2.5 to 15 microns are described. The ' relationship of transmittance of several absorption bands i < with the durability of the asphalt is discussed. Exposure j to ultraviolet radiation produced changes in transmittance ! at four wavelengths which, in a series of asphalts studied, showed statistically significant correlations with durability. ' 5 p. November-December 1959 Multiple ionization of rare gases by electron impact, M. Krauss, R. M. Reese, and V. H. Dibeler Electron impact studies of multiple ionization processes i in helium, neon, argon, and xenon appear to support

theoretical conclusions that the threshold probability

for n-fold ionization is proportional to the nth power of the electron energy in excess of the threshold energy. The i probability law applies, for the cases studied, over ai| considerable energy range that, for all but He2+

, includes the possible onset of more than one mode of ionization. The presence of a Boltzmann spread in the energy of the electron beam or specific focusing effects due to ion source 1 geometry are found to affect only the foot of the probability , curve. By the use of certain assumptions, an estimate is also made of the departure from a

3 P ionization probability curve resulting from onset of ionization to the 'D and 'S states. 4 p. Light scattering by commercial sugar solutions, C. J. Rieger and F. G. Carpenter Using a direct measure of scattered light, it was found

that commercial sugar solutions scatter light predom- | inantly in a forward direction. The scattering at angles

less than 30° was as much as one hundred times that at • right angles to the incident beam.

It was found that the light scattering by commercial

sugar solutions is inversely dependent on wavelength

to a power of between 2 and 3, and that severe multiple

scattering occurs when the turbidity of the solution is < larger than 2X10-'cm-> at 436 mM. The scattering of commercial sugar solutions is compared with that of

| highly purified sucrose. A method is discussed that will enable a good approx- imation of the turbidity of commercial sugar solutions to be made from a single forward scattering measurement

at an angle of about 20° with respect to the incident light beam. A correction for scattered light in transmission measurements of these solutions is also introduced. 7 p. Analysis of the first spectrum of ruthenium (Ru 1), K. G.

Kessler The analysis of the first spectrum of ruthenium has been extended with the aid of digital computers. A total of 105 even and 206 odd levels are listed with observed Land0 g-factors for 54 even and 148 odd levels. A complete list of approximately 3,400 classified lines in the range 2013 to 11484 A is presented. The ionization limit calculated from a two member series is 59410 cm-1 or , 7.364 v. 39 p. Supplementary Zeeman data for the first spectrum of ruthenium (Ru 1), J. R. McNally, Jr. and K. G. Kessler Zeeman data are listed for 207 lines of Ru 1 between 2400 and 5400 A, all of which have been classified. The

spectrograms were made at the Massachusetts Institute

of Technology and were analyzed there and at the National Bureau of Standards. 2 p. Low even configurations in the first spectrum of ruthenium (Ru 1), Part 2, R. E. Trees A published calculation for the 4d8

, 4d7 5s, and 4<i9 5s 3 1 configurations of Ru 1 (R. E. Trees, J. Opt. Soc. Am. 49, 838 (1959)) is repeated in steps. Displacements produced I
by configuration interaction are evaluated, and departures

of term positions from familiar expectations in the absence

of configuration interaction are explained. The weaker

perturbations produced by second-order effects of the

spin-orbit interaction are then determined. It is shown

that the neglect of these effects in published hand computations has obscured the remarkably good agreement

between theory and observation that is obtainable in spectra of the second long period. The eigenvectors are based on "third-order eigenfunctions" which describe

the levels simply, and show the degree of LS-coupling in a more quantitative manner. 6 p. Thermal degradation of polvmers at high temperatures,

S. L. Madorsky and S. Straus Work on thermal degradation of polymers has previ- ously been carried out at temperatures up to about 500° C.

In the present work the range has been extended to 850° C. Polystyrene was pyrolyzed in a vacuum and also in helium at atmospheric pressure at 362° and at 850° C. Analysis of the volatile products indicates that higher temperatures and higher pressures cause a greater frag- mentation of the volatile products. Samples of poly

(vinylidene fluoride), polyacrylonitrile, and polytrivinyl- benzene, were pyrolyzed in a vacuum at temperatures from 350° to 800° C. The more volatile products were

analyzed qualitatively and quantitatively in a mass

spectrometer. The less volatile products were tested for

their average molecular weight by a microcryoscopic method.

Rates of thermal degradation were also determined for the last three polymers. The activation energies in the temperature range 218° to 440° C. were found to be 48,

31, and 73 kcal/mole, respectively, for poly (vinylidene

fluoride), polyacrylonitrile, and polytrivinylbenzene. 8 p. Influence of impurities on the pvrolvsis of polyamides,

S. Straus and L. A. Wall A study has been made of the effect of drying and

purification of polycaprolactam (nylon-6) on its thermal

decomposition. The conclusions drawn from previous

work, that a hydrolytic mechanism is at least partially operating due to the presence of water and acid polymerization catalysts, are confirmed. Purification of the material decreases the rate of degradation and the production

of C02 , and increases the preexponential factor and the

activation energy. The hydrolytic decomposition, which

competes with the thermal free-radical degradation

process, would be expected to produce carboxylic acids and amines, the former decomposing further to form

.CO2. The preexponential factor is increased by sample

purification from 107 to 1010 and the activation energy from 34 to 43 kcal/mole. The decomposition behavior

of the purest sample is a nearly perfect example of the random decomposition of linear polymer chains. All other samples of polyamides thus far studied also appear to decompose by random or nearly random mechanisms. 5 p. A preliminary list of levels and ^-values for the first spectrum of thorium (Th 1), R. Zalubas The present state of the analysis of the first spectrum

of thorium (Th 1) is discussed briefly. Even and odd levels are listed in tables 1 and 2. The low even levels form

terms arising from the configurations 6d2 7s 2 and 6<23 7s. The Th 1 standard wavelengths that fit into the known

level arrays are presented in table 3. 4 p. OH in the solar spectrum, C. E. Moore and H. P. Broida

Revised identifications of OH lines in the solar spectrum

have been made from the detailed laboratory analyses

of the A 2 2+—

2 n bands. In the (0, 0), (1, 1), and (2, 2) bands a total of 175 solar lines are ascribed to OH unblended; 124 have OH as a partial contributor. Laboratory

intensities along the branches of the separate bands have

been used as a guide in making the solar identifications. 17 p.

Use of chebychev polynomials in thin film computations, K. D. Mielenz From Herpin's expression for the with power of a

multilayer matrix, very simple closed formulas are derived

for the matrices and optical constants of any multilayer with a periodic structure. According to Epstein's theorem, any symmetrical

multilayer is equivalent to a fictitious monolayer. A

simple expression for the equivalent index and thickness

of this monolayer is deduced for the case of a periodic and symmetrical sequence of equally thick films. As compared to any other method of numerical computation, the suggested formulation provides a considerable saving of time and work. In a numerical example, this saving amounts to about 80 percent. 4 p. TITLE PAGE AND CONTENTS TO VOL. 63A. 3 p. PAPERS FROM THE JOURNAL OF RESEARCH OF THE NA- TIONAL BUREAU OF STANDARDS, SECTION A. PHYSICS AND CHEMISTRY, VOLUME 64A, JANUARY-JUNE 1960 The "1958 He 4 scale of temperatures." Part 1. Intro- duction, F. G. Brickwedde and Part 2. Tables for the 1958 temperature scale, H. van Dijk, M. Durieux,

J. R. Clement, and J. K. Logan The generally used practical scale of temperatures between 1° a^id 5.2° K is the He4 vapor pressure scale based on an accepted vapor pressure equation or table. In Sevres (near Paris), October 1958, the International Committee on Weights and Measures recommended for international use the "1958 He4 Scale" based on a vapor

pressure table arrived at through international cooperation and agreement. This table resulted from a consideration

of all reliable He4 vapor pressure data obtained using gas thermometers, and paramagnetic susceptibility and

carbon resistor thermometers. The theoretical vapor

pressure equation from statistical thermodynamics was

used with thermodynamic data on liquid He4 and the vapor

equation of state to insure satisfactory agreement of the vapor pressure table with reliable thermodynamic data.

17 p. Energy levels and spectrum of neutral helium (

4 He i), W. C. Martin A table of energy levels based on the most accurate

observations now available is given for the neutral 4 He

atom. The wavelengths contained in a revised list of

4 He i lines from 320 A to 21132 A are also based on the best measurements, over half of them having been calculated from the wavenumber separations of appropriate levels. Several previously disturbing features of the 4 He term scheme are obviated by the revised level values. In a

discussion of the experimental results for this spectrum some comparisons with theory are made. 10 p. Vibration-rotation structure in absorption bands for the

calibration of spectrometers from 2 to 16 microns.

E. K. Plyler, A. Danti, L. R. Blaine, and E. D. Tidwell

Suitable bands of common gases have been tabulated and

remeasured wherever necessary from 2 to 16 microns to obtain an accuracy of about 0.03 cm-1 throughout the

region and to provide good calibrating points at frequent

intervals. Some 600 rotation-vibration lines are illustrated

in 20 spectrograms and wavenumbers are listed in companion tables with considerable intercomparison with worthy data obtained in other laboratories. The absorption bands were remeasured or calibrated by using either a

precisely graduated grating circle or standard atomic lines with the fringe system formed by a Fabry-Perot inter- ferometer. Characteristic features of the individual bands are discussed briefly and references to other publications are given. The substances used for calibration include H2 0, C02 , CO, HC1, HBr, NH3 , C2 H2 , CH4 , N2 0, and polystyrene film. 20 p. 37
Combustion calorimetry with fluorine: constant pressure flame calorimetry, G. T. Armstrong and R. S. Jessup Instruments and methods have been developed and are described for the measurement of heats of reaction between

fluorine and other gaseous materials. Verification of the amount of reaction of hydrogenous materials is possible. The estimated accuracy of measurements is about 0.3 percent. Lack of certainty of the magnitude of corrections

to be applied for hydrogen fluoride nonideality is an

important factor. The heat of formation of hydrogen

fluoride is found to be —64.4 ±0.25 kcal/mole on the basis

of the reaction of fluorine with ammonia, lip.

Pits in metals caused by collision with liquid drops and

rigid steel spheres, O. G. Engel A pit-depth-versus-velocity equation developed earlier was tested further with experimental data obtained using

target plates of electrolytic tough pitch copper, 1100-O

aluminum, and 2024-O aluminum, the static strength

properties of which were measured by testing tensile specimens. The projectiles used to produce the pits were mercury drops, waterdrops, and steel spheres. It was

found that the numerical constants in the equation for projectiles that flow during and as a result of the collision are different from those for projectiles that do not flow (hardened steel spheres). Curves calculated using the equation were found to be in acceptable agreement with

experimental pit-depth-versus-velocity data for collisions of the indicated projectiles with target plates of the three metals used with the exception of the case of steel-sphere impingement against 2024-O aluminum alloy. In this case work-hardening of the target metal seems to foster a mode of pit formation that was not considered in the development of the pit-depth-versus-velocitv equation.

12 p. Theory of formation of polymer crystals with folded chains

in dilute solution, J. I. Lauritzen, Jr., and J. D. Hoffman A detailed interpretation of the kinetics of homogeneous

nucleation and growth of crystals of a linear homopolymer

from dilute solution is given. The probability of forming both nuclei with folded chains, and conventional bundlelike nuclei, from dilute solution is analyzed. It is predicted that at sufficiently high dilution, critical nuclei of length

l"p will be formed from single polymer molecules by sharp

folding of the chain backbone. The step height of the nucleus is given approximately by l* = 4o- e/Af. Here <r e is the free energy required to form a unit area of the loop- containing end surfaces, and Af is the free energy difference per unit volume of crystal between the crystalline and

solution states. The quantity Af is approximately proportional to the degree of supercooling AT. The growth

of these nuclei is then analyzed. After growth, the

resulting crystal is flat and platelike, the loops formed by

the chain folds being on the upper and lower surfaces. Kinetic factors determine that the distance between the

flat surfaces in the grown crystal will vary over only a narrow range about a value' that is in the vicinity of

l* = 4o- e /Af. (Neglecting effects due to edge free energies, the theoretical upper and lower limits are l* = 4<r e /Af and

l* = 2<r e /Af, respectively.) In some cases the predicted temperature dependence of the step height of the grown

crystal, 1*= const. /AT, may be modified by the existence

of a constant term resulting from the presence of an edge

free energy e p

. A grown loop-type crystal is predicted to be stable in comparison with a bundlelike crystal of the same shape and volume in a sufficiently dilute solution. The logarithm of the nucleation rate is approximately

proportional to 1/(AT) 2 near the melting point. The

exponent n in the free growth rate law is predicted under

various assumptions. To the extent that comparison is possible, the predictions given agree with the experimental

results obtained by Keller and O'Connor and others on

single crystals of unbranched polyethylene grown from

dilute solution. A survey is given of homogeneous nucleation in bulk

polymers, where the conventional bundlelike nucleus containing segments from many different molecules is valid, and the essential results compared with those calculated

for the dilute solution case. The theory given for loop nuclei is both general and

precise enough at the critical points to suggest that, on

crystallization from sufficiently dilute solution, crystals of I

s a definite step height are commonly to be expected for ! I other crystallizable linear polymers than polyethylene, provided loop formation is sterically possible. 30 p. '

j Studies of beryllium chromite and other beryllia com- • I pounds with R2 03 oxides, C. E. Weir and A. Van '

Valkenburg

Reactions between BeO and R2 03 oxides at high tempera- ''j tures were studied. Compound formation was observed ! between BeO and the following oxides: B2 03 , A12 03 , Ga2 03 , Y2 03 , La2 03 , and Cr2 03 . No reaction was observed with I Sc2 03 , ln2 03 , and Fe2 03 . Detailed studies were made of BeO Cr2 03 which is isostructural with BeOAl2 03 . BeO- j Cr2 03 is a semiconductor. Optical and X-ray data are

;

| given for all reaction products. 4 p. Uranium-platinum system, J. J. Park and D. P. Fickle i| The phase diagram of the uranium-platinum system was j constructed from data obtained by thermal analysis, I metallographic examination, and X-ray diffraction. The

system is characterized bv four intermetallic compounds:

UPt, formed peritectoidally at 961° C; UPt2 , formed peri- 1 tectically at 1,370° C; UPt3 , melting congruently at 1,700° C; and UPt5 , formed peritectically at 1,460° C. One I eutectic occurs at 1,005° C and 12 a/o platinum, and a j second at 1,345° C and 87.5 a/o platinum. The maximum | solubilities are 4.5 a/o uranium in platinum and 5 a/o platinum in gamma-uranium. Platinum lowers the gam- i ma-beta uranium transformation to 705° C and the beta- alpha transformation to 589° C. lip.

Nitriding phenomena in titanium and the 6A1-4V titanium

alloy, J. R. Cuthill, W. D. Hayes, and R. E. Seebold : Nitriding unalloyed titanium in purified nitrogen at | 1,800° F produced a uniformly thick case that consisted

of five distinct zones. The same treatment applied to a

j 6A 1-4V titanium alloy resulted in a thinner nitride case that consisted of three zones and elongated nitride grains that penetrated into the core at approximately 45 degrees

to the specimen surface. The aluminum appears to be

responsible for the formation of the elongated grains. These grains, in turn, appear to be responsible for the

nitriding having a more adverse effect on the toughness of ; the alloy than of the unalloyed titanium, as indicated by

preliminary impact test results. The nitride case on the I titanium appears to increase in thickness with increase in nitriding time without limit. The nitride case exhibits a I hardness equivalent to about 77 Rockwell C at the surface ! down to almost 50 Rockwell C at the interface. 7 p. Stability of silver and pyrex in perchloric acid—silver perchlorate solutions and in conductivity water, D. N

Craig, C. A. Law, and W. J. Hamer

The stability of mint silver, purified mint silver, and |

! Pyrex fritted crucibles in aqueous solutions of perchloric I acid, in aqueous solutions of perchloric acid containing

silver perchlorate, and in conductivity water at room i temperature was determined. The stability of the silver in various states of subdivision was studied. The cor- rosion current-density for mint silver in sheet form is 1.1X10-8 amp cm-2 for 20 percent aqueous solutions of perchloric acid, 1.3X 10~9 amp cm-2 for 20 percent aqueous i solutions of perchloric acid containing 0.5 percent silver perchlorate, and within the limits of detection is zero for I conductivity water. Pyrex has high stability at 25° C in 20 percent aqueous solutions of perchloric acid and in 20 i percent aqueous solutions of perchloric acid containing 0.5 percent silver perchlorate. Finely-divided silver con- tained in Pyrex crucibles was found to be highly stable 38
when the crucibles were filled repeatedly with aqueous

solutions of perchloric acid containing silver perchlorate,

rinsed with conductivity water, and dried at 105° C. These observations are important in the determination of the Faraday by the anodic dissolution of silver in aqueous

solutions of perchloric acid which is now underway at the

National Bureau of Standards. 7 p. Note on the preparation of sodium amalgam in the form

of pellets, H. S. Isbell, H. L. Frush, and N. B. Holt A procedure is described for the preparation of sodium amalgam in the form of pellets. 2 p.

March-April 1960 A carbon-14 beta-ray standard, benzoic acid-7-C 14 in toluene, for liquid scintillation counters, W. F. Marlow

and R. W. Medlock A carbon-14 beta-ray standard for use in liquid scintil- lation counting has "been prepared and standardized. The sample consists of benzoic acid-7-C14 dissolved in toluene. Samples of the solution were oxidized quantitatively in a Paar oxygen bomb, and the radioactivity of the carbon dioxide was compared with the radioactivity

of carbon dioxide prepared quantitatively from the Bureau's sodium carbonate-C14 standard. 4 p. A comparison of experimental and theoretical relations between Young's modulus and the flexural and longi- tudinal resonance frequencies of uniform bars, S. Spinner, T. W. Reichard, and W. E. Tefft The relations from which Young's modulus may be computed from mechanical flexural and longitudinal reso- nance frequencies have been established by an empirical method using two sets of steel bars. Both sets contained

rectangular and cylindrical specimens. For longitudinal

vibration of cylindrical specimens, the agreement between

the empirical curves and Bancroft's corresponding theoretical relation was within experimental error if Poisson's

ratio for both sets is taken to be 0.292. For flexural vibrations, the agreement between the empirical curve and the corresponding theoretical relation developed by

Pickett is also within experimental error for about the same value of Poisson's ratio for the rectangular specimens

of both sets; but for clylindrical specimens, the empirical

values are somewhat lower than those predicted by the

theory. 9 p. Determination of copolymer composition by combustion analysis for carbon and hydrogen, L. A. Wood,

I. Madorsky, and R. A. Paulson A detailed description is given of the method of combustion analysis for carbon and hydrogen to determine

the composition of a copolymer from its carbon-hydrogen

ratio. The apparatus and procedures have been developed

at the National Bureau of Standards over a period of

years. The method has been applied chiefly to determine what fraction of a styrene-butadiene copolymer is derived from styrene. Minor ingredients are removed by extraction, with the exception of the bound mercaptan

residue for which correction must be made. The amount

of bound mercaptan residue is determined from measure- ments of the sulfur content of the copolymer by the Carius method. Measurements are made of the oxy- gen content and the ash content, although these do

not enter into the calculations. The standard devi- ation of a measurement of carbon-hydrogen ratio is approximately 0.001 0 and is independent of stvrene content. This corresponds to a standard deviation of about 0.036- percent bound styrene for polymers of low styrene content and 0.018 percent for polymers of high styrene

content. The accuracy of the method is demonstrated

by the fact that observations of carbon-hydrogen ratio for four out of five samples of polybutadiene differed by less than one standard deviation from the theoretical value.

6 p.

Some effects of aging on the surface area of portland cement paste, C. M. Hunt, L. A. Tomes, and R. L. Blaine A hardened cement paste cured at room temperature, from which part of the evaporable water has been removed

by vacuum drying, has been studied. The surface area

has been shown to decrease with time depending upon the the amount of evaporable water left in the paste. This change is the opposite of that usually observed during

hydration and probably represents some collodial growth phenomena analogous to aging observed in other col- lodial gels. Both water vapor and nitrogen adsorption measurements have been used to show the effects of aging

in cement paste. Wet or dry paste is shown to undergo less change than

paste of intermediate evaporable water content, so that

if surface area after storage is plotted as a function of evaporable water content, a curve with a minimum is obtained. With increasing storage temperature there

is some indication that this minimum might shift towards

lower water content. Aging is shown to occur during the initial drying of a cement paste, so that even the initial surface area of a cement paste depends upon the manner in which the paste has been dried. 7 p. Conformations of the pyranoid sugars. I. Classification of conformers, H. S. Isbell and R. S. Tipson An improved system is presented for indicating the

principal conformations of pyranoid sugars and derivatives, by attaching two symbols to the systematic name. The

first symbol shows the kind of pyranoid ring; for example, B=a boat, C =the chair, and S = a skew form. (The

three boat and six skew rings are distinguished by subscript numerals referring to exoplanar ring-atoms.) The second symbol differentiates between two conformations that have

the same type of ring, by describing as A or E the axial or equatorial character of the reference group at a selected ring-atom. If the anomeric group is not quasi, the a

anomericjjroup is used as the reference group. For sugars and derivatives having a quasi anomeric group, and for relatives lacking an anomeric group, the A or E classifica- tion is based on the reference group at the lowest numbered,

nonquasi, asymmetric ring-atom. 6 p. Tritium-labeled compounds III. Aldoses-.?-/, H. S. Isbell, H. L. Frush, N. B. Holt, and J. D. Moyer

In a new method for preparing aldoses labeled with

tritium at carbon 1, the aldonic lactone is reduced with

lithium borohydride-/ in pyridine solution. The method

is suitable for preparing aldoses-./-/ having high specific

activities. The crude product contains a susbtantial pro- portion of the corresponding alditol-1-/, but the pure

aldose-./-/ is readily separated by fractional recrystalliza- tion or paper chromotography. By means of an isotopedilution technique, yields were determined for the following

aldoses-./-/ and the corresponding alditols-^-/: D-arabinose1-t, D-xylose-i-/, D-ribose-7-/, D-glucose-/-/, D-galactose-7-/, D-mannose-./-/-, L-rhamnose-1-/, maltose-i-/, and lactose1-t.These labeled materials were also prepared by reducing

the corresponding lactones with sodium amalgam in tritiated water. Although this latter method is not suit- able for preparing labeled aldoses of high specific activity, the products are more readily purified than those obtained by reducing the lactones with lithium borohydride-/.

D-Glucose-./-/, obtained by each of these reduction methods, was oxidized with bromine, and the resulting D-gluconic acid was found to be nonradioactive. Hence,

in the samples oxidized, tritium was present only at CI. An apparatus used for reclaiming tritiated water by

freeze-drying is depicted: it incorporates an efficient device

for trapping entrained solids or liquids. 4 p.

39
Determination of aluminum in precipitation hardening

stainless steel and high temperature alloys, L. A. Machlan, J. L. Hague, and E. J. Meros. A procedure is described for the determination of aluminum in high temperature alloys. Aluminum is selectively precipitated with 8-hydroxyquinoline from an ammoniacal solution of the alloy containing citrate and

cyanide as complexing agents. The precipitate is ignited under oxalic acid, the oxides fused, and dissolved in acid. A caustic precipitation is made, an aliquot of the filtrate .treated with hydrogen peroxide, and the aluminum precipitated with 8-hydroxyquinoline. The aluminum

hydroxyquinolate is filtered on a fritted-glass crucible,

dried, and weighed. 4 p.May-JuDe 1960 Phase shift effects in Fabry-Perot interferometry, C. J. Koester A method is demonstrated for utilizing in Fabry-Perot

interferometry the data on reflection phase shift dispersion obtained from fringes of equal chromatic order. Unknown

wavelengths can be calculated from the Fabry-Perot patterns obtained with a large etalon spacing, even without

prior knowledge of the phase shift of the reflecting surfaces. When the theoretical phase shift as a function of wavelength is known approximately, then the correct orders of interference can be determined for both the Fabry-Perot

fringes and fringes of equal chromatic order. From the wavelengths of the latter the phase shift dispersion can be measured to an accuracy of about 10 A. The method is especially useful for reflectors with large dispersion of phase shift, such as multilayers. Results in the visible spectrum are reported for aluminum films and a pair of

dielectric 15-layer broadband reflectors. 10 p. Infrared absorption spectrum of methane from 247^ to 3200 cm-', E. K. Plyler, E. D. Tidwell, and L. R. Blaine The absorption spectrum of methane has been measured

from 2470 to 3200 cm-' with a high-resolution infrared spectrometer. Pressures from 0.01 to 4.5 cm of the gas were used in order to observe both intense and weak lines. A total of 2,460 lines were measured in the entire region. The i>3 band at 3018 cm-1 was measured at very slow scanning rates and the lines of the P and R branches were

resolved into several components. The observed spectrum

is shown in five figures. 12 p. Elastic constants of synthetic single crystal corundum at room temperature, J. B. Wachtman," Jr., W. E. Tefft, D. G. Lam, Jr., and R. P. Stinchfield The six elastic constants (and six elastic compliances) of corundum were determined in the kilocycle per second fre- quency range by an accurate resonance method. The

results were checked in the megacycle per second range

with a less accurate, pulse velocity method. The elastic moduli for polycrystalline alumina calculated from the

single crystal compliances determined by the resonance method are in good agreement with experimental values obtained on high density polycrystalline alumina. The

variation of Young's modulus and of the shear modulus

with orientation was calculated from the compliances and

the results aie shown graphically. The results of the pres- ent work do not agree well with previous work on single crystal sapphire. The specification of orientation and the theory used to calculate the elastic constants are given in detail to support the contention that the results of the present work are correct. 15 p. Radial distribution study of vitreous barium borate, A. Bienenstock, A. S. Pos'ner, and S. Block X-ray diffraction, radial distribution studies of a 20 per- cent barium oxide, 80 percent B2O3 glass have been per- formed using both the atomic and electronic distribution functions. From these distributions, the average barium- barium distance has been determined as 6.76 A. This

distance is in good agreement with that predicted by Levin and Block on the basis of a structural interpretation of immiscibility data. 5 p. Separation and determination of small quant it ies of alumi- num in steel, B. B. Bendigo and R. K. Bell A method is described for determining small amounts of aluminum (0.01 to 0.3 percent) in stainless and carbon

steels. A perchloric-sulfuric acid solution of the steel is 1 electrolyzed in a mercury cathode cell to remove most of j the iron, and an extraction with chloroform is made to '• remove elements such as aluminum, residual iron, and ' titanium as cupferrates from a solution buffered at pH ii 3.5. These elements are converted from cupferrates to perchlorates; all except aluminum are then extracted as cupferrates with chloroform from 4 N hydrochloric acid. Aluminum in the acid solution is determined photometrically with aluminon (ammonium aurintricarboxylate) at a wave length of approximately 540 millimicrons. An .1 accuracy of ±0.005 percent aluminum is indicated. 4 p. Conformations of the pyranoid sugars. II. infrared absorption spectra of some aldopvranosides, R. S. Tipson and :I H. S. Isbell The conformations of twenty-four aldopyranosides have

been studied by analysis of their infrared absorption

spectra. The most stable conformations of twelve of the glycosides had previously been assigned by Reeves from

a study of their instability factors; these conformations ! were assumed to apply to the crystalline state, for which

the spectra had been recorded. The compounds were

classified into (a) configurationally and (b) structurally related groups, and the spectra were intercompared. The

analysis revealed groups of absorption bands which showed

a concerted shift on change of anomeric disposition. With these groups of absorption bands thus identified, intercomparison with nine of the remaining spectra af- forded evidence that the anomeric group (1) is axial in methyl D-^tycero-a-L-gZwco-heptopyranoside, methyl D- ^/i/cero-a-L-monno-hcptopyranoside, and methyl D-glycero- a-D-j/it/o-heptopyranoside; (2) is equatorial in methyl 6- deoxy-/3-L-mannopyranoside, methyl n-gh/cero-P-D-gulo- heptopyranoside, and cyclohexyl D-glycero-fi-n-gitlo-he'pto- pyranoside; and (3) either is quasi or occurs as different (or mixed) axial and equatorial forms in methyl a-D-lyxopranoside, methyl /3-D-lyxopranoside, and (possibly) a-D-methylgulopyranoside. Three of the glycosides were available as their crystalline complexes with calcium chloride. The spectra of these complexes were also examined, and the effect of co-crystallization with calcium chloride is pointed out. 25 p.

3.3. PAPERS FROM THE JOURNAL OF RESEARCH OF THE

NATIONAL BUREAU OF STANDARDS, SECTION B. MATHEMATICS AND MATHEMATICAL PHYSICS, VOLUME 63B, JULY-DECEMBER 1959July-September 1959 Relations between summation methods and integral trans- formations, W. Greub

Relations between the Lototsky method of summation

and those of Borel, Euler, and Knopp are obtained by

associating an integral transformation with the series transformation. 13 p. On a modification of Watson's lemma, F. Oberhettinger The method of steepest descents is extended to the case when a saddle point and a pole of arbitrary order are in- volved. An application to a problem in diffraction theory

is demonstrated. 3 p. Principal submatrices of a full-rowed non-negative matrix, K. Goldberg

It is shown that one of the principal submatrices of an

incidence matrix without zero rows is a permutation 40
matrix. From this an inspection method is described for determining whether a non-negative matrix is nilpotent. Application is made to graph theory. 2 p. Zeros of certain polynomials, A. J. Goldman

Let P be a real parameter. It is proved that all roots

of ?"+' — z

n + P = 0 lie in the open unit disk, if and only if 0<P<2 sin 7r/(4n + 2). 2 p. Tables of transport integrals: a supplement, W. M. Rogers, W. J. Hall, and R. L. Powell

Tables of values of the transport integrals, defined by

, , . C

x e'zndz J" (I)=

J. w=w

were previously published in NBS Circular 595 for values

of n from 2 through 17. In this paper, values are given

for the integrals where n is 18 and 20 and where x ranges from 0.2 to 50.0 in steps of 0.2 8 p. Lens design: a new approach, O. N. Stavroudis

This paper describes a new method of defining the total aberrations of an optical system and its application to lens

design. A system of partial differential equations defining optical image formation is written in the form of 4 by 4 matrices and is applied to the derivation of lens aberrations. It is shown that the form of the matrices

facilitates the computation of these aberrations and that

equations of condition on the lens parameters can be

derived. The use of this method is illustrated through

its application to a simple, well-known problem. 12 p. Analytical integration of the differential equation for water storage, V. M. Yevdjevich The integration of the storage differential equation at

present is usually done mostly by graphical or numerical

procedures. An approach to the analytical integration of that equation is the subject of this paper. A new method

of fitting the given background curves by mathematically

tractable expressions is introduced. The storage-outflow

discharge relation is expressed in the form of a power

function. A general differential equation for water

storage y' + cPy2 — cy k = 0 is derived, with c and k constants

for the given reservoir, outflow shape and type of flow, and P being the inflow hydrograph. The analytical

solutions of this equation for P= 0, P= constant, and

certain P=f(t) are given for the integrable cases (tables

1 to 3, eqs (12) to (29)). The application of the results obtained is discussed at the end of the paper. 10 p. Compressible turbulent boundary layers with heat transfer and pressure gradient in flow direction, A. Walz The best-known theoretical works on boundary-layer

problems, especially in the case of compressible flow with- out or with heat transfer, are related to the laminar boundary layer, although the turbulent boundary layer is, in practice, often more interesting. The laminar boundary layer is more easily accessible to theoretical treatment

because clearly defined relations exist between the vis- cosity n and the shear stresses tt. In the turbulent case, empirical relations must be introduced. Therefore, attempts to get exact solutions are not worthwhile, while

efforts to obtain approximate solutions, based for instance on the von Karman-Pohlhausen principle (Z. Angew.

Math. u. Mech. 1, 233, and 252, 1921) of utilizing integral conditions, appear to be appropriate to this problem. In

the last few years the accuracy of such approximate

solutions for the incompressible case was noticeably im- proved by the application of a new energy integral condition in connection with a new empirical law for the

dissipation in turbulent boundary layers, stated by J. Rotta (Ingr-Arch. 20, 195, 1952) and E. Truckenbrodt

(Ingr-Arch. 20, 212, 1952). The empirical laws for dis- sipation and for turbulent wall friction, which are needed

in the present approximate theory, are formulated on the

basis of available measurements for incompressible flow. Generalization to the compressible flow with heat transfer

is made from physical considerations. Calculated results agree satisfactorily with available experimental data. Some possibilities for improving as well as for simplifying the approximation theory are outlined. 18 p. Applications of a theorem on partitioned matrices, E. V. Haynsworth A reduction formula for partitioned matrices is applied

to block-stochastic matrices and other types of partitioned matrices in order to reduce the computation in finding the

eigenvalues. Such matrices occur frequently in physics and chemistry, and the reduction formulas given here have

been applied successfully in practical problems. In addition, some results of A. Brauer on stochastic matrices and

of J. Williamson in partitioned matrices are generalized.

6 p. Capacity requirement of a mail sorting device: II, A. J. Goldman

The combinatorial analysis of a mathematical model of a sorting device suggested by S. Henig is completed. The

relevant parameters are r, the number of destinations for the mail, and k, the number of letters entering the device during each cycle of operation. The capacity of the device, if it is never to jam, should be between rk and rk —

(r—1) inclusive; arguments indicating that the latter value

is preferable are given. 4 p. Analytic comparison of suggested configurations for auto- matic mail sorting equipment, B. K. Bender and A. J. Goldman

Analytic methods are developed to aid in determining

the equipment configuration which achieves sorting of outgoing mail at a given (required) rate at least cost. The techniques are applied to a specific numerical problem;

several of the suggested configurations are quickly elimi- nated, and a "hybrid" of two of the proposed configu- rations is found which comes within four percent of opti- mum (if a certain pair of parameters is chosen correctly). 22 p. New method of solution for unretarded satellite orbits,

J. P. Vinti. An axially symmetric solution of Laplace's equation in oblate spheroidal coordinates is found, which may be used

as the gravitational potential about an oblate planet. This potential, which makes the Hamilton-Jacobi equation

for a satellite orbit separable, has an expansion in zonal harmonics in which the amplitudes of the zeroth and

second harmonics can be adjusted to agree exactly with

the values for any axially symmetric planet and a fourth harmonic which then agrees approximately with the latest value for that of the earth. The net result is therefore a

reduction of the problem of satellite motion to quadratures, with use of a potential field that is much closer to the empirically accepted one for the earth than any heretofore used as the starting point of a calculation. It may

thus be possible to do the gravitational theory of a satellite orbit very accurately without use of perturbation theory. The method can take into account a first harmonic in the

potential, in case observations are reduced to a center which does not coincide with the center of mass of the

planet. 12 p. Effect of sudden water release on the reservoir free outflow hydrograph, V. M. Yevdjevich The free outflow hydrograph is studied in the case of a sudden water release from a reservoir. The outflow hydrograph is called free when it is not affected by the 41
tailwater levels. Both the effect of the steep negative wave, created by sudden water release, and the effect of the flow resistance are analyzed through the use of a

fictitious inflow hydrograph. The water accelerated by

the steep negative wave movement, whether or not the

flow resistance is taken into account, gives this fictitious hydrograph. The procedures are given for the computation of the wave celerities and the new water velocities along the reservoir, for the computation of wavefront

heights and the maximum outflow discharges, and for the determination of the fictitious and total inflow hydrograph. The examples are given for the pyramidal reservoirs of rectangular and parabolic cross sections. A general pro- cedure for the determination of the reservoir free outflow hvdrograph in an approximate form is derived. 13 p. Uniform asymptotic expansions for Weber parabolic cyl- inder functions of large orders, F. W. J. Olver Expansions of solutions of the differential equation

are sought for large values of which are uniformly valid with respect to arg m and unrestricted values of the complex variable f. Two types of expansion are found. Those

of the first type are in terms of elementary functions and

are valid outside the neighborhoods of the points <=±1,

the turning points of the differential equation. The sec- ond are in terms of Airy functions and hold in unbounded

regions containing one of the turning points. The special forms of the expansions when the variables are real are considered in detail, and asymptotic expansions for the zeros of solutions of the differential equation

are found by reversion. Numercial examples are included. 39 p. TITLE PAGE AND CONTENTS TO VOL. 63B. 3 p. PAPERS FROM THE JOURNAL OF RESEARCH OF THE NA- TIONAL BUREAU OF STANDARDS, SECTION B. MATHEMATICS AND MATHEMATICAL PHYSICS, VOLUME 64B- JANUARY-JUNE 1960 January-March 1960 Theory of diffraction in microwave interferometry, D. M.

Kerns and E. S. Dayhoff Microwave Michelson and Fabry-Perot interferometers

are respectively considered as instances of: (1) A "reflec- tion system", consisting of a radiating-receiving system and a reflecting object (e.g., a finite mirror); and (2) a "transmission system", consisting of a radiating system and a receiving system with an object (e.g., a FabryPerot etalon) interposed. The basic theoretical objective

is the calculation of the amplitude and phase of the (time- harmonic) received signal in the systems considered. The

electromagnetic field in space transmission paths is repre- sented in terms of continuous angular spectra of vectorial plane waves, and the elements of the systems are described by means of suitable tensor scattering matrices (having both discrete and continuous indices). Needed scattering matrices are considered known; relationships to experi- mentally determinable data are outlined. The general

case of either the reflection or transmission system is soluble formally in terms of a series of integrals stemming

from the Liouville-Neumann series solution of certain

integral equal ions. Formulas are obtained for models

of tlie Michelson and Fabry-Perot instruments with arbi- trary radiating and receiving characteristics. The theory and various features of the instruments considered, in- cluding Fresnel-region (or quasi-optical) behavior, are

illustrated by means of examples obtained by choosing

relatively simple and rather hypothetical analytical expressions for the radiating and receiving characteristics. 13 p. Some solutions for electromagnetic problems involving

spheroidal, spherical, and cylindrical bodies, J. R. Wait

Solutions are presented for the low-frequency electro- magnetic response to an oscillating magnetic dipole by

conducting bodies of simple shape. The quasi-stationary approximation is employed throughout, which is valid : h when the relevant dimensions of the problem are all small \

: compared to the free-space wavelength. This amounts

to matching solutions of the wave equation within the '

j bodies to solutions of Laplace's equation outside. The > results have application to geophysical prospecting. 18 p. I Kantorovich's inequality, M. Newman

An elementary proof with a generalization of an in- equality of Kantorovich is given. 2 p. A symmetric continuous poker model, A. J. Goldman and ' | J. J. Stone Beginning with von Neumann., mathematicians con-

' cerned with the rational analysis of conflict situations i have realized that investigation of accurate or simplified versions of common card games leads to techniques and

insights applicable to situations of military or economic | interest. In the present paper, a symmetric poker model >

, one stage more complicated than the original von Neu- mann game is solved. There are two bet levels, a, b, and an ante of 1 unit (a>b>l); no raises are permitted. I The game has a unique optimal strategy, which forbids 1 bluffing on a low hand. The limiting case 6=1 is shown i to yield the von Neumann model. 6 p. Moebius function on the lattice of dense subgraphs, R. E. ! Nettleton and M. S. Green The Moebius function /* on the lattice of fc-dense sub- graphs of a connected graph, defined in a previous paper,

is calculated for graphs G containing isthmuses and

articulators. fx evaluated for the null graph <j> is shown to vanish if G contains an isthmus, while for any integer q there exist graphs containing articulators for which

fi(f) = q- The "lattice of path sets" joining a pair of points and the lattice of graphs "associated with G and a subgraph G'" are defined and the Moebius functions on

these lattices are shown in certain cases to be related to

/.. 7 p. The minimum of a certain linear form, K. Goldberg The positive minimum of the integral linear form

L(xu . . ., x n)=a,xi + . . . +anx n is found subject to the conditions o,>0 and L(xu . . ., x n) >2a,x, for i = ) ,2, . . ., n. 2 p.

| Space of fc-commutative matrices, M. Marcus and N. A. ; Khan

Let [A, X\ = AX-XA and [A, X] k =[A, [A, X] t_,]. Those matrices X which "A-commute" with a fixed matrix A are investigated. In particular, the dimension ot the

null space of the linear transformation T(X)—[A, X]k when A is nonderogatory is determined. 4 p. Selected bibliography of statistical literature, 1930 to 1957: I. Correlation and regression theory, L. S. Deming

This is the first in a series of bibliographies dealing with

various specific subjects in the field of statistics. Refer- 1 ences and titles of important contributions in correlation and regression theory have been taken from technical journals published throughout the world since 1930.

'14 p. Selected bibliography of statistical literature, 1930 to 1957: II. Time series, L. S. Deming

This is the second in a series of bibliographies dealing with various specific subjects in the field of statistics. References and titles of important contributions to the study of time series have been taken from a wide variety

of technical journals published in the many languages and

countries which have been actively engaged in statistical analysis. 8 p. 42
Non-self-adjoint boundary value problems in ordinary

differential equations, W. Greub and W. C. Rheinboldt

1 It is shown that the theory of non-self-adjoint linear ordinary differential equations can be simplified and unified if, instead of specifying linear boundary conditions

in the conventional way, one merely specifies the linear subspace determined by the boundary conditions. If this is done, the corresponding linear space of the adjoint problem is the orthogonal complement of the original space with respect to the scalar product defined by the

right-hand side of Green's boundary formula. 8 p. Criteria for the existence and equioscillation of best Tchebycheff approximations, J. R. Rice

| Let F(a,z)=2ai(pi(x) where v>i(x) are continuous in [0,1] and the a, are real parameters. The following theorem

answers the principal questions of a general nature in the

theory of Tchebycheff approximations: Theorem. Let

\<p,(x)} form a Tchebycheff set and let/(x) be an arbitrary

function continuous on [0,1]. Then (A) f(x) possesses a best approximation, (B) a necessary and sufficient condition that F(a*,x) be a best approximation to f(x) is that max[F((!*,i) —f(x) | alternates at least n times in [0,1],

' (C) the best approximation to f(x) is unique. A. Haar

[Math. Ann. 78, 43-56 (1928)] posed and answered the

following question: What conditions on F are necessary and sufficient for theorem C to be valid? The condition

he found is that \<pi{x)\ must form a Tchebycheff set. This paper poses and answers the following three questions:

(1) What conditions on F are necessary and sufficient for

' theorem A to be valid? (2) What conditions on F are necessary and sufficient for theorem B to be valid? (3) What conditions on F are necessary and sufficient for both

theorems A and B to be valid? This paper does not tacitly assume that the a, may

assume all values. 3 p. Note on the solution of Riccati's differential equation, H. H. Howe

Three recurrence formulas are developed, giving the

solution of a particular case of Riccati's equation in power

series valid in the neighborhoods of 0, oo, and an arbitrary

point, respectively. The first two were programed for computation on the SEAC. 4 p. On a generalization of the index notation for absolute

tensors of arbitrary order, E. H. Brown A generalized vector index notation is introduced which

facilitates study of properties of tensors regardless of order and variance of components. This generality is obtained by replacing the set of m indices, each of which vary in a single domain of n integers, by one vector index which

varies over the integral lattice points of an m-dimensional

domain. The notation also suggests an elegant treatment

of order transformations of tensors.* 5 p. Upper and lower bounds for the center of flexure, L. E. Payne

There is disagreement in the literature as to how the

center of flexure of an isotropic elastic beam should be

defined. In either of the two most widely accepted definitions, upper and lower bounds for the coordinates of the

center of flexure are obtained. 7 p. Half-round inductive obstacles in rectangular waveguide, D. M. Kerns

Formulas are derived for the accurate calculation of the lowest-mode, lumped-element representation of perfectly conducting half-round inductive obstacles in rectangular waveguide. These obstacles consist of either one or two

opposed semicircular cylindrical indentations extending

across the narrow sides of the waveguide. They seem

especially suitable for use as precise calculable standards of

reflection or impedance in waveguide. Schwinger's

integral equation approach is used to obtain stationary

expressions for the desired parameters as functionals

of the surface currents on the obstacles. Upper bounds

are obtained for one of the two parameters. Explicit formulas are derived for the values of the parameters under the assumption of n-term Fourier sine-series ex- pansions for the obstacle currents. Rapid convergence is indicated by numerical evaluations for n=l, 2, and 3. In the process of obtaining expressions suitable for numerical calculation, an expansion (believed to be new) of the Green's function of the problem is obtained and the sums

of certain infinite series of Bessel's functions occurring in this expansion are expressed in terms of definie integrals. A brief numerical table of these sums, sufficient for the evaluation of the n=l approximation, is included. 18 p.

3.4. PAPERS FROM THE JOURNAL OF RESEARCH OF THE

NATIONAL BUREAU OF STANDARDS, SECTION C. ENGI- NEERING AND INSTRUMENTATION, VOLUME 83C, JULY- DECEMBER 1959 Creep of cold-drawn nickel, W. D. Jenkins and C. R. Johnson

Creep tests were made in tension under constant loads

at temperatures of 300°, 700°, 900°, and 1,200° F on

specimens of nickel initially cold-drawn to 40-percent

reduction in area. None of the equations for defining the

strain-time relationship proposed by other investigators was found to be suitable to express or predict the creep-test

results of this investigation with high accuracy because

these equations inadequately describe the changes in structure accompanying the creep processes. However,

conformance to the parabolic strain-time law was obtained

over limited ranges of stresses and strains. The effects of cold-drawing on the creep properties are discussed. Certain etching techniques were employed that gave evidence

of the presence and movement of dislocations in the

structure. 18 p. Friction and endurance of prelubricated and unlubricated

ball bearings at high speeds and extreme temperatures, H. S. White Endurance tests wr ere made with 20-millimeter bore pre- lubricated ball bearings, at 10,000 revolutions per minute,

using polyester felt rings saturated with di(2-ethylhexy) sebacate containing appropriate additives, at ambient

temperatures ranging from 80° to 400° F. Tests were made with greases for comparative purposes. Results

indicate that endurance with these oil-soaked pads is comparable with the high-temperature performance of MIL-G-3278 grease at 250° F and MIL-L-3545

grease at 300° F. Some endurance tests were made with

special bearings (20-millimeter bore) made of high-speed

tool steel, prelubricated at 450° F ambient temperature, and unlubricated at 650° F ambient temperature (5,000 revolutions per minute at 650° F). Experiments were made with greased bearings and with felt-pad oiled bearings

in gyros and small high-speed direct-current motors at high temperatures. With oiled bearings and with unlubricated bearings, wearing or breaking of separators

(ball cages) was the most common cause of failure. Compared to low-temperature greases MIL-G-3278 and MIL-G-7421 with oiled bearings starting friction was

low and running friction was about one-tenth that of greased bearings at —75° F ambient temperature, lip.

Effect of light and water on the degradation of asphalt,

L. R. Kleinschmidt and H. R. Snoke

Coatings prepared from two blown petroleum asphalts

in a thickness range of 0.002 to 0.04 inches were exposed

to accelerated test conditions and outdoors. When ex- posed to light only, a surface film, insoluble in common

asphalt solvents, was formed. The formation of this surface film was accompanied by a gain in weight of the

coatings, apparently due to an oxygen pickup. This sur- 569918 O—61 4 43
face film retarded further degradation of the maltenes

during the exposures made to light only. When the coatings were immersed in water after exposure, or sprayed

with water during exposure, or exposed outdoors, they lost weight. These decreases in weight were found to be in part due to the extraction of water-soluble, light-degraded

material. Their magnitudes were dependent upon the asphalt exposed, the thickness of the exposed coatings, and the exposure conditions. The relationship between

the losses in weight and water-soluble material, when

considered in conjunction with the oxygen content of the

asphalts and the water-soluble materials, indicated that

volatile degradation products were also formed. When the surface skin formed by the action of light was partially removed by washing with water, percentage

decreases were noted in the water-white oils, dark oils, and asphaltic resins. Since these decreases were unequal

in magnitude and since the losses in weight were dependent

on the thickness of the coating, it was concluded that light- degradable components of the asphalt had migrated to the

surface to replace degraded material that had been washed

away. 6 p. Current and potential relations for the cathodic protection

of steel in a high resistivity environment, W. J. Schwerdtfeger

In order to evaluate potential and current criteria for the cathodic protection of bare low-carbon steel in a highresistivity environment, specimens were exposed in the

laboratory for a period of two months to a soil having a

resistivity of about 20,000 ohm-centimeter.

Previous work in low-resistivity environments by the author and by other investigators has shown that corro- sion can be reduced to a negligible degree by polarizing a

steel structure to —0.85 volt (protective potential) with

reference to a copper-copper sulfate electrode. In such

studies by the author, cathodic polarization curves have

also been shown to be useful in indicating the current

density required for cathodic protection. In the present study the above criteria were again

evaluated. In addition to protecting the steel at the

protective potential (free of IR drop) , the effect on protection of including IR drop caused by the protective current was also noted. Also, cathodic polarization curves were

obtained on a recorder in conjunction with a bridge circuit to eliminate the IR drop. The results show that the best degree of protection was

achieved on the specimen controlled at —0.77 volt (with- out IR) with reference to a saturated calomel half-cell. This is approximately equivalent to the protective potential — 0.85 volt with reference to the copper-copper sulfate electrode. Applied current indicated by the break

(change-in-slope) in the cathodic polarization curve agreed

reasonably well with the actual current necessary to maintain polarization at —0.77 volt (free of IR). The current required for protection was about three times the magnitude of the corrosion current; therefore, the corrosion reaction was either under anodic control

(unlike previous studies) or an equivalent type of control which was caused by high resistance at anodic areas. 9 p. A tilting air-lubricated piston gage for pressures below

one-half inch of mercury, U. O. Hutton A description is given of a tilting dead-weight piston gage constructed at the National Bureau of Standards for ranges of differential pressure up to about 0.5 inch of mercury. A resolution of better than 1 part in a hundred

thousand of full scale has been obtained by use of the tool- maker's sine bar method of angle measurement. The

scale is a linear function of the sine. The instrument can

be calibrated from basic measurements of length and

weight, is rugged, and may be constructed in almost any

laboratory mechanical shop. Sources of possible errors

in reading are discussed in detail. Comparative tests with

certain other gages or manometers are cited wherein

linearity was found to be within 1 part in 10,000 and agree- ment within 2.5 parts in 10,000. The uses of the gage are

briefly discussed, lip.

Compact multi-anvil wedge-type high pressure apparatus, E. C. Lloyd, U. O. Hutton, and D. P. Johnson

Apparatus for generating high pressures by application , of force by an anvil against each face of a solid polyhedron j is described. The equipment constructed utilizes a tetra- hedron of pyrophyllite and four tungsten carbide anvils as a described earlier by H. T. Hall. External force is applied

to only one of the anvils, and wedge reaction forces act

on the other anvils, permitting the equipment to be used

in a conventional hydraulic press. Examples of results of use of the equipment are given. Success of the design has j been shown by the repeated generation of pressures in excess of 100,000 atmospheres indicating that large exist- ing presses might be used to generate pressures of this order in volumes of several cubic inches. For higher pressures a two-stage multi-anvil apparatus is proposed:

in which the second-stage anvils are embedded in a large pyrophyllite tetrahedron to obtain necessary supporting;

forces. 6 p. A coulometric-titration coulometer, S. W. Smith and:

J. K. Taylor A highly precise coulometer is described which permits time integration of currents totaling 100 coulombs or more

with a precision of about 1 part in 100,000. The current

to be integrated oxidizes hydroquinone in an electrolysis

cell, producing quinone and acid. The quinone is then reduced by constant-current coulometric titration, the end

point being indicated by hydrogen-ion concentration measurements. 4 p. Electron beam magnetometer, L. Marton, L. B. Leder,

J. W. Coleman, and D. C. Schubert A theoretical investigation of the electron optics of an

electron beam deflection method for detecting small magnetic fields is presented. It is shown that remarkably

high sensitivity can be reached. A laboratory model of such a magnetometer was constructed, and it was demonstrated that the theoretical estimate of sensitivity, 3X 10-6 ampere per oersted, could be attained in practice. A discussion of the possible improvements which could extend the sensitivity of the device is also given. 7 p. A refined X-band microwave microcalorimeter, G. F. Engen The microcalorimetric method for evaluation of the

efficiency and substitution error of a bolometer mount

proposed by Macpherson and Kerns has been the object

of further study and refinement at the Boulder Laboratories of the National Bureau of Standards, and an im- proved instrument based on this technique has been

recently placed in operation. The new microcalorimeter design features are: (1) Greatly improved ambient temperature control, permitting

higher sensitivity and resolution; (2) improved d-c instru- mentation; (3) improved mechanical construction giving

better repeatability; (4) relocation of the thermopile so that it no longer is attached directly to the bolometer mount, thus providing flexibility in the choice of termination; and (5) a more comprehensive treatment of the

calorimetric substitution or equivalence error. These

features permit the determination of the effective efficiency of a bolometer mount to an accuracy of better than 0.2 percent. 6 p.

October-December 1959 Conical coaxial capacitors and their advantages, M. C. Selby Adjustable capacitors having electrodes in the form of coaxial cones or frustums have been used on rare occasions in the past, but their potential superiority to other types of capacitors for some important applications has been overlooked. The advantage of this geometry over

cylindrical or disk forms is that the practical capacitance range is several times larger. An example cites the capacitance ranges for the same mechanical and percentage 44
accuracy of a disk, cylindrical and conical type to be 10,

40, and 168 to 1, respectively. An approximate equation was derived for this conical capacitor and close agreement

is shown bet ween computed and measured values of capaci- tance versus electrode displacement. Multiple cone and

specially shaped electrodes are suggested to obtain large values of capacitance with an appreciable saving of space and further increased range of capacitance. 3 p. A photoelectric followup and recording system, and its application to remote observations of the beam in high-precision balances, H. A. Bowman and L. B. Macurdy A device is described which permits a significant increase

in the frequency of the oscillations of the beam of a balance, thereby shortening the interval during which upsetting ambient conditions can act. The device is a servo-driven

photoelectric followup system responding to the position- modulated light signal reflected from a mirror attached to

the balance 12 ft away from the photocell. Reproducibility in observing the position of the light beam is 0.001

in. or less. 6 p. A stroboscopic vibration analyzer, S. Edelman, R. Brooks,

S. Saito, E. Jones, and E. R. Smith An instrument for studying the amplitude and phase

relations which exist in complex periodic processes is described in this paper. The process treated here is vibration of complicated bodies. The motion at each point of

interest is detected by a vibration pickup. The signal from each pickup is heterodyned with a common signal that differs from the vibration frequency by a small amount

to produce a set of signals at the difference frequency. The desired relations are exhibited at the difference fre- quency which is low enough to give a slow motion effect. The output circuitry allows scope for ingenuity to choose

a presentation suited to a particular problem. 7 p. Evaluation of lens distortion by the inverse nodal slide, F. E. Washer and W. R. Darling The evaluation of lens distortion by means of the inverse nodal slide method is discussed. The sources of error inherent in the method are investigated. Emphasis is given to the effect of asymmetric use of apertures. Measurements are reported on the same lens for which distortion values were measured by the direct nodal slide and photographic methods. A comparison of results obtained by

the three different methods is given. It is concluded that

accurate values of the distortion of a lens can be obtained by the inverse nodal slide method and that the precision

of measurement is comparable to that of the two other methods mentioned when proper attention to sources of

error is given. 8 p. Evaluation of lens distortion by the modified goniometric method, F. E. Washer and W. R. Darling

This is the third of a series of papers dealing with factors

affecting the accuracy of measurement of lens distortion by various visual and photographic processes. This paper

presents the results of a study of the visual modified

goniometric method which employs a viewing theodolite and accurate linear scale. Sources of error are investigated and discussed. Measurements are reported on the same

lens that was used in the analysis of two visual and one

photographic distortion measuring processes. A comparison of results by the four different methods is given. It

is concluded that accurate values of lens distortion can

be obtained by the modified goniometric method provided

care is taken to use centered apertures and to preserve known angular relationships between telescope pointings and successive locations. 8 p. Proposed criteria for defining load failure of beams, floors, and roof constructions during fire tests, J. V. Ryan and

A. F. Robertson A brief account is presented of procedures used in development of criteria for defining the point at which

fire test specimens fail to sustain load during test. It

is proposed that both a deflection of L2/800d and an

hourly rate of deflection of L2/150d be taken as an indica- tion of load failure. In these formulas, L is the span between supports of the member or element found to be

critical under fire exposure, and d is the distance between

upper and lower extreme fibers of the particular structural component or assembly. 4 p. Conductive flooring for hospital operating rooms, T. H.

Boone, F. L. Hermach, E. H. MacArthur, and R. C. McAuliff

Characteristics and performance of available types of conductive flooring materials were investigated in the

laboratory. The study showed that the electrodes and

instruments used to measure the floor greatly affected the measured resistance, but that the method specified by

the National Fire Protection Association for measuring

the electrical resistance reasonably simulated the conditions under which a floor functions in reducing electrostatic hazards. The physical, chemical, and serviceability characteristics of conductive floorings investigated showed

results comparable with those of nonconductive flooring

of the same type. Consequently, with some limitations, an architect may base his choice of a conductive flooring material on his knowledge of the behavior of similar nonconductive materials. 16 p. Measurement of the aging of rubber vulcanizates, J. Mandel, F. L. Roth, M. N. Steel, and R. D. Stiehler A study of aging data in the literature and of measure- ments made at the National Bureau of Standards indicates that ultimate elongation is the best of the tensile properties

for characterizing the deterioration of rubber vulcanizates during storage at various temperatures. Ultimate elon- gation (strain at failure) decreases during aging for all types

of rubber vulcanizates; whereas tensile strength and modulus may increase, decrease, or remain essentially unchanged.

This study includes measurements of ultimate elongation

of a nitrile rubber vulcanizate after various periods of storage at temperatures of 23°, 34°, 45°, 57°, 70°, 85°, and

100° C. It also includes a study of the published data on

ultimate elongation obtained in an interlaboratory test conducted by Subcommittee 15 of ASTM Committee

D-ll, involving vulcanizates of five different rubbers

stored at 25°, 70°, 100°, and 121° C. The change in ultimate elongation over prolonged periods

of storage cannot be expressed by a simple mathematical

equation. However, during most of the useful storage life of a rubber vulcanizate, the elongation decreases approxi- mately linearly with the square root of time. The data

indicate that for some vulcanizates an estimate of storage

life at room temperature can be made from measurements

of ultimate elongation at two or more elevated temperatures. 5 p. TITLE PAGE AND CONTENTS TO VOL. 63C. 3 p. PAPERS FROM THE JOURNAL OP RESEARCH OP THE NA- TIONAL BUREAU OF STANDARDS, SECTION C. ENGINEERING AND INSTRUMENTATION, VOLUME 64C, JANUARYPower loss and operating temperature of tires, R. D.

Stiehler, M. N. Steel, G. G. Richey, J. Mandel, and

R. H. Hobbs

The power loss of pneumatic tires was measured under

steady-state conditions by means of two dynamometers,

one of which measured the total power input and the other power output. A steel wheel was used to measure the power loss in the equipment and in windage. The power

required to flex the tire (input power minus output power

minus equipment and windage losses) , was not affected by

the tractive effort (output power). The coefficient of

rolling resistance, a dimensionless quantity, was calculated by means of the equation: R=(P/SL), where P is power

loss of tire, S is speed, and L is load. This coefficient increased at an increasing rate with the slip angle (angle 45
between plane of tire and direction of travel) and was

approximately doubled at an angle of 2 degrees. The change in R with speed varied and appeared to de- pend on construction of the tire. Both nylon and steel wire truck tires exhibited a decrease in R with speed, rayon

truck tires showed either no change or a linear increase in R with speed, and for passenger car tires R increased at an

increasing rate with speed, particularly for a rayon tire. R increased with load for all but the steel wire tire. The

change in R with inflation pressure was studied only for rayon truck tires. R increased linearly with the reciprocal

of" the pressure but the rate was dependent on the speed and load conditions. The type of rubber had a pronounced effect on R and

combinations of natural and styrenebutadiene rubber

caused R to be larger than expected from the values of R for

tires made from a single rubber. Varying the type of carbon black in the treads of truck tires had no effect on R, but SAF black in passenger car tires caused R to be larger than that when HAF black was used. Because of constructional differences, no conclusions on effect of cord

could be drawn. However, R for a steel wire truck tire was the lowest observed, and the values for rayon tires were lower than those for nylon tires except at high speeds. The temperature rise of the air in the inner tube was

found to be related to the power loss by the relation: AT/P=G + HI(SL)o-* where G and H are parameters dependent on the thermal resistance of the rubber compounds and of the interface between tire and air or road- way, respectively. The ratio A T/P remained essentially unchanged by changes in inflation pressure and did not appear to be affected by the type of cord. lip.

Effects of antioxidants on asphalt durability, B. D. Beitchman The mechanism by which asphalt degrades during weathering can be studied profitably by observing the action of materials which inhibit this degradation. A number of antioxidants which are believed to function

either by their ability to inhibit chain reactions or to decompose peroxides were studied for their effectiveness in retarding weight loss and promoting durability of roofing

asphalts. Inhibitors of chain reactions in some cases inhibited weight loss without extending durability. Compounds which decompose peroxides were observed to be

capable of extending the durability of an asphalt and also

of retarding weight loss. Phenothiazine, which is believed

to function primarily as a peroxide decomposer, proved to be the most outstanding of the inhibitors tested. A study made in one asphalt of the dependence of phenothiazine activity on concentration indicated that a concentration of 2 percent was optimum. In several other

asphalts, 2 percent phenothiazine retarded weight loss to varying extents without significantly altering the durability of the asphalt. Synergistic activity was shown by the use of an inhibit- ing mixture containing phenothiazine and Ar-phenyl-2- naphthylamine. The results of this study support the hypothesis of a

free radical process being involved to a considerable degree in asphaltic degradation during weathering. 5 p. Temperature stratification in a nonventing liquid helium Dewar, L. E. Scott, R. F. Robbins, D. B. Mann, and

B. W. Birmingham The presence of a large temperature gradient in Dewars

used for transporting helium is undesirable because it may be accompanied by unnecessarily high internal pres- sures when the contents are sealed. In a study of the

problems, such gradients were observed in experiments conducted with a 39.7-liter stainless steel Dewar. A

method is shown for calculating the pressure rise in the absence of temperature gradients and the results are compared with the observed pressure rise. In some cases curves representing calculated and observed pressure rise intersect. A possible explanation of this situation is given. The destratifying effect of a concentrated heat input and

of copper rods is shown. 5 p.

Expansion engines for hydrogen liquefiers, E. H. Brown I Criteria are developed for the practicability of expansion!] engines and expansion turbines in large hydrogen liquefiers. > Some additional data on pertinent properties such as the' sonic velocity of normal hydrogen are included. The:! analysis suggests that use of expansion turbines in hydro- gen liquefiers having a production capacity of less than : 5,000 liters per hour ordinarily would not be justified. For greater capacities, however, use of modern materials and design should make expansion turbine performance even more favorable than in liquefiers for denser fluids. 12 p. A statistical chain-ratio method for estimating relative volumes of mail to given destinations, N. C. Severo and

A. E. Newman

A sampling method, called the chain ratio method, is applied in estimating the distribution of mail by destination. Variances and coefficients of variation for the esti- mators are given. The details and results of three applications of this sampling method to outgoing first-class letter mail are given. These studies were conducted by the National Bureau of Standards in San Francisco, Los

Angeles, and Baltimore, lip.

Standard free-air chamber for the measurement of low

energy X-rays (20 to 100 kilovolts-constant-potential), V. H. Ritz A description of the new National Bureau of Standards "low" energy free-air chamber is given. The standard chamber is designed to measure the exposure dose in roentgens for X-ray beams generated at potentials from

20 to 100 kilovolts-constant-potential (kvcp) with nitra- tions ranging from 2 millimeters of beryllium to 2 milli- meters of beryllium plus 4 millimeters of aluminum. The

chamber has been compared with the National Bureau of Standards "medium" energy standard at 60, 75, and 100 kvcp with nitrations of 3, 3, and 4 millimeters of alumi- num, respectively. The two standard chambers agreed

to within 0.3 percent. 5 p. Transmittance of materials in the far infrared, E. K.

Plyler and L. R. Blaine The transmittance of several crystalline materials with

thicknesses of about 5 mm has been measured from 17 to 55 n. The crystals are sodium chloride, potassium chloride, potassium bromide, thallium bromide-iodide, cesium

bromide, and cesium iodide. Also the transmittance of a polyethylene film containing carbon black has been measured to 100 n and an example of its use as a transmission

filter for the far infrared is given. 2 p. Equipment and method for photoelectric determination

of image contrast suitable for using square wave targets,

F. W. Rosberry

Conventional measurements of the resolving power of lenses employ measuring photographs of test charts containing an array of accurately spaced parallel lines. This method has limited precision because of the variability of photographic emulsions and is time-consuming

in operation. This paper extends previous work by others

in obviating these differences by using a direct photoelectric scanning of a line-pattern image formed by the

lens under test. Square wave high contrast resolving power targets with two different line pattern arrangements

were used as test objects. The image was moved across a stationary slit and photomultiplier tube. The output was recorded as relative transmission. 8 p. Formation of silver sulfide in the photographic image

during fixation, C. I. Pope A photographic silver image is made permanent (fixed) after development by bathing it in a solution containing

thiosulfate which forms a soluble thiosulfate complex with 46
the residual silver halide. Some of the silver in the image

is sulfided by the thiosulfate during fixation. The purpose

of this study was to determine the amount of sulfiding

of the silver in the image during fixation of film and

paper. The amount of the silver reacting depends on

the type of the light-sensitive layer. Also, during bleaching, the residual thiosulfate in the film or paper reacts with silver in a potassium dichromate-sulfuric acid bleach bath to form silver sulfide. For one paper, it was shown

< that the amount of silver sulfide which was formed in the bleach bath increased with the increase of the concentration of the residual thiosulfate in the paper. A proce- dure was developed for the reduction of silver sulfide in an emulsion layer to silver so that the silver sulfide may

' be determined in terms of the optical density of the silver deposit. The use of hypo eliminators was investigated and a test procedure was' found for testing the effectiveness

of hypo eliminators. A small amount of potassium iodide

i added to the fixing bath was found effective in preventing most of the sulfiding of the silver image during fixation. 9 p. Capacitor calibration by step-up methods, T. L. Zapf

Step-calibration methods are used in many physical

laboratories for the extension of measurements to quantities far removed from the magnitude of greatest accuracy

. at which absolute determinations are made. The excellent

precision of repetitive substitution procedures is exploited by step-up or step-down methods to extend measurements

to higher or lower magnitudes without serious degradation

of accuracy. The application of step-up techniques to the calibration of variable air capacitors is described in

this paper as a practical example of the method. 5 p. Measurement of cobalt-60 and cesium-137 gamma rays with a free-air chamber, H. O. Wyckoff

Design data for free-air chambers measuring cobalt-60 and cesium-137 gamma rays in roentgens are presented.

It has been shown that the Jaffe-Zanstra method of obtaining the saturation current is adequate for air pressures

of about 4 to 12 atmospheres. Also, radiation measure- ments of the gamma rays from cobalt-60 and cesium-137 made by a cavity chamber and a free-air chamber agree

to within the experimental errors. 11 p. Apparatus for the measurement of the normal spectral emissivity in the infrared, A. G. Maki, R. Stair, and

R. G. Johnston Apparatus and methods are described for measuring in the infrared the normal spectral emissivity of metals and

coatings or oxides which tightly adhere to metals. Examples of the use of this apparatus are given in measure- ments of the emissivity of platinum and of oxidized Inconel within the spectral region of 1.5 to 15 microns. Measured values were reproduced to better than 5 percent. 4 p. Electrostatic deflection plates for cathode-ray tubes.

I. Design of single-bend deflection plates with parallel entrance sections.

II. Deflection defocusing distortion of single-bend deflection plates with parallel entrance sections, L. Frenkel In section I, a plate design system is offered which allows rapid and accurate determination of mechanical plate parameters to achieve given electrical plate characteristics. The design is suitable for single-bend plates with parallel entrance sections. The design curves were calculated under the conventional assumptions of small deflection theory, but corrections for the entrance and exit fields are included. The method of calculating the curves and

corrections is indicated in an appendix.

Section II deals with deflection defocusing of such plates, a convenient formula for calculating the defocusing dis- tortions of single-bend deflection plates is derived and

compared with experiment. This type of distortion is proportional to the square of the deflection angle and is shown to be sensitive to plate design. In general, long

deflection plates give lower distortions while the most

"economical" plates yield larger distortions. Post deflec- tion is shown to lead to increased distortions, lip. The functional synthesis of linear plots, J. P. Vinti and R.

F. Dressier In practical engineering or experimental work one often encounters a function F of many variables, F (x's, y's, z's), represented only by the families of curves obtained by

plotting F against each of the x's on Cartesian graph paper,

against each of the y's on semilog paper, and against each

of the z's on double-log paper. It frequently happens that

these curves are all approximately straight lines over a

limited range of interest. On the assumption that they

are all true straight lines, the present note shows how to synthesize all the graphical representations, for any number

of parameters, into the most general formula possible, expressing F as the product of a multilinear function of the

x's and the exponential of a constant-free multilinear function of the y's and of the log z's, the coefficients in both multilinear functions being independent of the x's,

y's, and z's. 5 p. Radiation field from a rectangular source, J. H. Hubbell,

R. L. Bach, and J. C. Lamkin Many radiation shielding problems involve calculations

of the response of an isotropic detector to radiation of arbitrary angular distribution from uniform rectangular

sources. In calculations of this tvpe the family of integrals /s(cos 6dSM)P,(cosd) and the integral fs(dS/r*) exp (-fit/

cos0) are frequently encountered, where d is obliquity with

respect to an axis perpendicular to the plane containing

the rectangular radiant surface, S, r is the distance from

an element of source area, dS, to the detector, n is the attenuation coefficient, and t is the barrier thickness. Solutions of the first type of integral facilitate use of Legendre expansion representations of radiation directional

distributions, and may also have application in other

radiant surface studies, such as illumination and heat exchange engineering. The second integral relates to exponentially attenuated radiation from a plane isotropic rectangular source separated from the detector by a layer

of material of thickness t. Formulas, expansions, and

numerical results are presented. 18 p. Microwave attenuation measurements with accuracies from 0.0001 to 0.06 decibel over a range of 0.01 to 50

decibels, G. F. Engen and R. W. Beatty The application of certain power stabilization and meas- urement techniques to the problem of attenuation measure- ment has yielded a measurement system with a stability and resolution of the order of 0.0001 decibel. A practical application for this technique was recently provided in the

calibration of a rotary vane type of variable microwave

attenuator. In order to take complete advantage of this increased

stability it was necessary to apply refined techniques to the evaluation and reduction of mismatch error. This proved to be by far the most exacting practical application of the cited techniques encountered to date, but the results of this calibration showed excellent agree- ment with the mathematically predicted values used in marking the attenuator dial. 7 p. Effect of oleophobic films on metal fatigue, H. E. Frankel,

J. A. Bennett, and W. L. Holshouser The fatigue strengths of a low-alloy steel, a magnesium

alloy, and a copper-beryllium alloy were increased by

coating the specimens with certain polar organic compounds. Also the dispersion of the results was much less for coated specimens of these materials than for clean

ones. Similar tests showed no effect with titanium or 47
6061 aluminum alloy, and only a slight improvement for 17-7 PH stainless steel. The full beneficial effect of the coatings was found only with compounds having a carbon chain of at least twelve, and this effect was not significantly reduced when the coated specimens were tested in water. Organic solvents (benzene and xylene) had a deleterious effect on the

fatigue life of materials that were improved by oleophobic

coatings.

It is suggested that the effect of the coatings is princi- pally due to their ability to present a barrier to water and

oxygen molecules. 4 p. Ratio-recording spectroradiometer, H. K. Hammond III, W. L. Holford, and M. L. Kuder A ratio-recording spectroradiometer has been constructed primarily for determining the relative spectral irradiance from fluorescent lamps in the visible spectrum. Radiant flux from a test source and a comparison source

is transmitted or reflected by separate diff users. The

irradiance from each diffuser is sampled alternately of the

order of 100 times a second by a double prism monochromator with cam-linearized' wavelength drive from

360 to 760 my.. A 14-stage multiplier phototube with S-20 response is used with an electronic gate and inte- grator circuits to compare the spectral irradiances from

the two sources. When the phototube outputs are unequal, a servo unit adjusts apertures in each beam to

equalize them. The measured parameter is the amount

of adjustment required for equalization at each wavelength. The apertures are adjusted by a cam coupled to a pen which records the ratio on a three-cycle logarithmic

strip chart. The instrument requires about 8 minutes to record the spectrum at lOmju per inch. An expanded

scale of 1 m/j. per inch is used for evaluating the energy in the spectral lines. The speed of wavelength scan may be made inversely proportional to the unbalance signal, if desired, to provide ample time to record spectral lines accurately. Symmetry of beam treatment is demonstrated by interchanging test and comparison sources and recording the inverse ratio. 7 p. An intermittent-action camera with absolute time cali- bration, G. Hefley, R. H. Doherty, and E. L. Berger A detailed description is presented of a film-recording system in which a randomly occurring event and its absolute time are recorded simultaneously. The system consists of a 16-millimeter framing camera capable of inter- mittent operation at a maximum rate of 140 frames per second (fps) and a clock capable of reading out time with an absolute accuracy of plus or minus 1 millisecond

(msec). 7 p.

3.5 PAPERS FROM THE JOURNAL OF RESEARCH OF THE

NATIONAL BUREAU OF STANDARDS, SECTION D. RADIO PROPAGATION VOLUME 63D, JULY-DECEMBER 1959 Preliminary results of the National Bureau of Standards

radio and ionospheric observations during the inter- national geophysical year, D. M. Gates A review is given of the activities of the National Bureau of Standards during the International Geophysical Year. The equipment used on each project is described and preliminary results of the observations are

given. The following areas of research are discussed:

(1) World Warning Agencv, (2) Ionospheric Vertical Sounding Stations, (3) VHF Propagation, (4) VHF

Equatorial Forward Scatter, (5) Radio Noise Network,

(6) Radio Satellite Observations, (7) Airglow Observations, and (8) World Data Center for Airglow and Ionosphere.

14 p. Origin of [OI] 5577 in the airglow and the aurora, F. E. Roach, J. W. McCaulley, and E. Marovich The distribution of 5577 zenith intensities at stations

in the subauroral zone is found to be unimodal with no

discontinuity at the visual threshold. This is interpreted

as evidence that 5577 airglow and 5577 aurora may have ' a common origin. 4 p. Comparison of absolute intensities of [OI] 5577 in the

auroral and subauroral zones, F. E. Roach, J. W. i McCaulley, and C. M. Purdy The distribution of 5577 zenith intensities is compared |- for Fritz Peak, Colo., in the subauroral zone and Thule, I! Greenland, near the geomagnetic pole. The absolute ' I

intensity is bright enough to permit visual detection at |

! the Colorado station during 2 percent of the time and at j the Greenland station, 27 percent of the time. The ' distribution curves have a general similarity, suggesting ' i a phenomenological similarity in the excitation mech- . ! anisms at the two stations. 2 p. Origin of "very-low-frequency emissions," R. M. Gallet

' and R. A. Helliwell

Selective traveling-wave amplification in the outer ; j ionosphere is postulated to explain very-low-frequency

;

! emissions, a class of very low-frequency (1 to 30 kilocycles

'

:

j per second) natural noise. By analogy with the mech- ! anism of traveling wave tubes, low-level ambient j noise in the outer ionosphere is amplified in streams of incoming ionized solar particles at frequencies for which

the stream and wave velocities are equal. Required

velocities are in the range 0.01 to 0.1 c (where c is the velocity of light) . Streams with densities of the order of one

electron per cubic centimeter would provide sufficient energy. Phenomena which can be explained qualitatively by the theory are the hiss, quasi-constant tones, dawn

chorus and related transients, and very long trains of whistler echoes. A quantitative example shows how the , theory can reproduce the general form of certain char- , acteristic discrete spectra "hooks" of emissions, and how I this leads to definite values of particle velocity and a law

j for the distribution of electron density in the outer

ionosphere. 7 p. Climatology of ground-based radio ducts, B. R. Bean An atmospheric duct is defined as occurring when

geometrical optics indicate that a radio ray leaving the transmitter and passing upwards through the atmosphere

is sufficiently refracted that it is traveling parallel to the

earth's surface. Maximum observed incidence of ducts was determined as 13 percent in the tropics, 10 percent

in the arctic and 5 percent in the temperate zone by

analysis of 3 to 5 years of radiosonde data for a tropical, temperate, and arctic location. Annual maximums are observed in the winter for the arctic and summer for the

tropics. The arctic ducts arise from ground-based

temperature inversions with the ground temperature less • than —25° C while the tropical ducts are observed to occur with slight temperature and humidity lapse when

the surface temperature is 30° C and greater. 6 p. Power requirements and choice of an optimum frequency

for a worldwide standard-frequency broadcasting

station, A. D. Watt and R. W. Plush

Calculations are presented for the expected transmission

characteristics and atmospheric noise levels in the 8- to 100-kc band. When these are combined with carrier-to- noise requirements for a given precision of frequency

comparison, it is indicated that a minimum radiated power

in the order of 10 to 100 kw for frequencies in the vicinity

of 20 kc will be required to provide worldwide coverage. Minimum observation times of 15 to 30 min appear to be

required for these transmitter powers in order to obtain

a precision of frequency comparison of 1 part in 10° for typical transmission paths. Carrier-to-noise requirements and the factors determining this ratio are considered for typical receiving systems. 10 p. 48
Measurements of phase stability over a low-level tropospheric path, M. C. Thompson, Jr., and H. B. Janes A knowledge of the statistics of atmosphere-induced

variations in the phase of the received signal (i.e., variations in electrical path length) is essential in evaluating

the reliability of any system using radio waves for measuring distance and/or velocity. This paper describes an

analysis of phase variations measured at 9,400 megacycles

per second over a 9.4-mile path near Boulder, Colorado,

during a 40-hour period in September 1958. The power

spectral density of these variations is shown to be approxi- mately proportional to/-2 - 8 over a wide range of frequencies throughout the period of recording. The long-term

phase variations are closely correlated with atmospheric

refractivitv measurements " made at the path terminals.

7 p. System loss in radio wave propagation, K. A. Norton A summary is presented of the ways in which the concept of system loss and the closely related concepts of transmission loss, basic transmission loss, propagation

loss, and path antenna gain may be used for precise, yet

simple, descriptions of some of the characteristics of radio wave propagation which are important in the design of radio systems. Definitions of various terms associated with the concept of system loss are given which introduce

a greater flexibility into its use without any loss in precision. It is shown" that the use of these added terms and

concepts makes feasible the extension of the use of this method of description to any portion of the radio spectrum. A more general formula for the system loss is given which may be used for antennas with an arbitrarily small separation. Using this formula it is shown that the system loss between small electric or magnetic dipoles separated by a

distance d X can be made arbitrarily small even though

the individual antennas have large circuit losses. Formulas

are developed for the percentage of time that" a desired

signal is free of interference, and these are used to demonstrate methods for the efficient use of the spectrum. In

particular, contrary to general belief, it is shown that

efficiency is promoted by the use of high power and high antennas and, in the case of a broadcast service, sufficiently small separations so that there is appreciable mutual inter- ference. An analysis is made of the variance of the path

antenna gain in ionospheric scatter propagation. Methods

are given for the calculation of the transmission loss for the ground wave and troriospheric scatter modes of propagation through a turbulent model atmosphere with an

exponential gradient. Examples of such calculations are given which cover a wide range of frequencies and antenna

heights. Finally, examples are given of the expected range

of various tropospheric point-to-point scatter systems such

as an FM multichannel teletype system, a television relay

or an FM broadcast relay. 21 p. Mode expansion in the low-frequency range for propagation through a curved stratified atmosphere, H. Bremmer

This expansion is particularly useful when considering

ionospheric propagation at low frequencies. The complex problem dealing with two media, viz., a homogeneous

earth and a surrounding stratified atmosphere, leads to

intractable expressions. However, as the influence of the

earth may be accounted for by an approximate boundary

condition at the earth's surface, the problem is then re- duced to that of the outer medium only. The coefficients

of the mode expansion for this simplified problem will be

derived while taking into account the earth's curvature; however, the latter proves to be negligible under very

general conditions. The expansion to be derived is wanted

in particular when studying the influence of a gradual

transition in the electron density with height at the lower

edge of the ionosphere, lip.

Transmission and reflection by a parallel wire grid, M. T. Decker A comparison is made at X-band frequencies of the

theoretical and measured transmission and reflection coefficients for a parallel wire grid. The methods used are applicable to the measurements of these factors for various

building materials. 4 p. Synoptic variation of the radio refractive index, B. R. Bean

and L. P. Riggs The synoptic variation of the atmospheric radio re- fractive index, evaluated from standard weather observations, is examined during an outbreak of polar continental

air. It is found that the reduced-to-sea-level value of the

refractive index is a more sensitive synoptic parameter

than the station value. The reduced value is quite

sensitive to the humidity and density structure of the storm under study while the great station elevation dependence of the station value tends to mask synoptic

changes. The reduced value changes systematically with

the approach and passage of the polar front. The present system shows a consistent increase of the reduced value in the warm sector of the wave and a marked decrease behind

the cold front. 7 p. Low-frequency propagation paths in arctic areas, A. D.

Watt, E. L. Maxwell, and E. H. Whelan

The very low ground conductivities encountered in arctic

areas, and the particular ionospheric conditions prevailing

at high latitudes, can lead to rather unusual radiation and propagation conditions. In order to determine the magnitude of these effects, field intensities from trans- mitters located in the Labrador and Greenland areas were measured both on the surface of the earth and during

several aircraft flights over this area. The many factors involved in If propagation are considered and calculated

field intensities compared with experimental values. Under conditions where the initial portion of the propagation path is across icecap or permafrost, the attenuation observed is very great, and when the propagation path

extends out over sea water, the field intensity recovery

taking place after the coastline is crossed is very marked.

Estimates of skywave field intensity appear to agree with

the observed results provided the radiated field pattern is suitably modified by the antenna cutback factor which

accounts for the presence of a finitely conducting curved

earth. These vertical patterns based on work by Wait,

along with the field intensity flight data, indicate that the

siting of low-frequency stations several miles or more

inland in arctic regions may cause a great increase in total transmission path loss. 14 p. Stratification in the lower ionosphere, C. Ellyett and

J. M. Watts A survey of the evidence for stratification in the iono- sphere below 100 km is given, covering radio and optical observations, and rocket measurements. The conclusion

is reached that one stratum at about 85 km is observed

consistently, and that other fine structure exists but has no long time constancy of height or pattern. There is no

series of preferred heights below 100 km. The authors

consider explanations which may account for the observations, and advocate the testing of radio methods of exploration in conjunction with rocket measurements in order to develop the most practicable means of obtaining accurate

electron density versus height profiles on a synoptic basis. 18 p. Effect of small irregularities on the constitutive relations

for the ionosphere, K. G. Budden

Irregularities in the ionosphere which are small compared

with one wavelength may modify the constitutive relations, and hence, may affect the refractive indices for electro- magnetic waves. The modifications are in some ways

similar to those which would be introduced into the Appleton-Hartree formula by a Lorentz force. The theory

is given first for the case when the irregularities extend only

in one dimension, and it is found that even in a loss-free medium the refractive index now has an imaginary part 49
which might be associated with loss of energy from the wave by scattering. The theory for three-dimensional

irregularities is then discussed but is more difficult, and a method of successive approximations is used. The

results indicate that small irregularities may play an

important part in the propagation of very-low-frequency

radio waves in the ionosphere. In particular, they may

explain why "whistlers" are observed only on comparatively rare occasions. 15 p. Ionospheric investigations using the sweep-frequency

pulse technique at oblique incidence, V. Agy and

K. Davies

This paper describes the present state of oblique- incidence investigations of the ionosphere, using the sweepfrequency pulse technique, with special reference to the work carried out at the National Bureau of Standards.

After a short review of the published literature, obliqueincidence sweeps are presented showing the diurnal and

seasonal variations on two east-west paths of lengths 1,150 kilometers and 2,370 kilometers. The discrepancies between observed and calculated maximum usable

frequencies are presented for both paths and then various phenomena of interest are shown. Finally, the above phenomena are discussed in the light of existing knowledge and theory and, in particular, it is shown that the dis- crepancies between observed and calculated maximum

usable frequencies are unlikely to be caused by magnetoionic deviation of the ray. 24 p. Fields in electrically short ground systems: an experimental

study, A. N. Smith and T. E. Devaney An experimental study of magnetic field distribution

in a simplified radial ground system on poorly conducting

soil under an electrically short, toploaded monopole is described. It is shown that the distribution is that ex- pected from the theory of J. R. Wait in those portions

of the radial system satisfying the assumptions of the

theory, and that the theory may still be successfully applied

for //-field power loss computations even when this is not

fully the case. The particular model system studied

exhibits a condition suggesting damped standing waves

on the radials in the area where the radial spacing exceeds

that required by the theory. 6 p. Diffraction of electromagnetic waves by smooth obstacles

for grazing angles, J. R. Wait and A. M. Conda

The diffraction of electromagnetic waves by a convex

cylindrical surface is considered. Attention is confined

primarily to the region near the light-shadow boundary. The complex-integral representation for the field is utilized to obtain a correction to the Kirchhoff theory. Numerical

results are presented which illustrate the influence of sur- face curvature and polarization on the diffraction pattern. Good agreement with the experimental results of Bachynski and Neugebauer is obtained. The effect of finite conductivity is also considered. 17 p. Very-low-frequency radiation spectra of lightning dis- charges, W. L. Taylor and A. G. Jean

Spectral analyses are given of the groundwave portion

of 33 sferic waveforms recorded from cloud-to-ground light- ning discharges which occurred at distances ranging be- tween about 150 and 600 kilometers from Boulder, Colo. Frequencies of peak energy lie between 5 and 20 kilocycles per second, which agree favorably with other published

results. The average value of energy calculated from the groundwave pulses was found to be 26,600 joules, which

is lower than values derived from other experiments. Various parameters, such as the peak amplitude and

duration of the first half-cycle, are related to the radiated energy of the stroke. 6 p.

Radio-wave scattering by tropospheric irregularities, A. D. 1 Wheelon The subject of radio-wave scattering by turbulent j irregularities in the tropospheric index of refraction is '

1 reviewed. Descriptions of the turbulent medium are |

considered first, together with a status report on physical

theories for the spectrum of irregularities. Phase and i amplitude scintillations induced on electromagnetic waves I propagated along line-of-sight paths are discussed next, i. The complementary problems of signal statistics and '

i electromagnetic-propagation calculations are summarized ! i and compared with available data. Both the geometrical '< optics and wave theory approaches are discussed. The I theory of propagation beyond the horizon by scattering ' from the same irregularities is then described. A current | review of the predictions for received power, signal fluctua- : I tions, and antenna effects is given. The paper is primarily 1 a review of the essential and auxiliary predictions of \\ scatter theory, but also contains a considerable amount of i unpublished research by the author. 29 p. Study at 1,046 megacycles per second of the reflection ( coefficient of irregular terrain at grazing angles, R. E. \ i McGavin and L. J. Maloney An experimental determination of the reflection co- j efficient over rough terrain is reported. The reflected signal received over rough terrain is considered to be I made up of two components, one that is a specular component and the other a Rayleigh-distributed component. Where one terminal is low, the Rayleigh component is I considered to be small with respect to the specular com- i ponent but increases in relative magnitude as the height

of the lower terminal increases. A terminal height is reached where the specular component is no longer signifi- | cant, and the reflected energy is essentially Rayleigh- > distributed. A terminal height is quickly reached above i which the mean value of the reflected energy is relatively constant, of a low value, and independent of the grazing

angle. 14 p. Synoptic study of the vertical distribution of the radio ' refractive index, B. R. Bean, L. P. Riggs, and J. D. Horn ( An analysis of the vertical structure of an intense out- break of continental polar air is presented in terms of the

j radio refractive index of the atmosphere. Employed for the first time is a reduced index analogous to potential temperature. The reduced value more clearly shows

the refractive index structure than the classical methods

used heretofore. This new unit is a measure of both atmospheric density and humidity and shows, on a single cross section, the airmass structure and the dynamic

mixing of air around the frontal interface. 6 p. November-December 1959 Radio-refractive-index climate near the ground, B. R. Bean and J. D. Horn

The radio refractive index of air is a function of atmospheric pressure, temperature, and humidity and is found

to vary in a systematic fashion with climate. It was

found that the surface value of the refractive index may

be estimated four to five times more accurately from charts

of reduced-to-sea-level values than from similar sized charts of surface index. Worldwide maps of 5-year means

of this reduced value are presented for the months of February and August, for the minimum monthly mean

value of the year and for the range of monthly mean

values. Year-to-year variation of monthly means is also considered. Applications of these data to the prediction

of radio field strengths indicate a possible 30-decibel differ- ence in median level of identically equipped tropospheric communications systems due to climate alone. 13 p.

50
Path antenna gain in an exponential atmosphere, W. J. Hartman and R. E. Wilkerson The problem of determining path antenna gain is treated here in greater detail than previously. The method used here takes into account for the first time the ex

ponential decrease of the gradient of refractive index with height, and a scattering cross section inversely proportional to the fifth power of the scattering angle. Results are given for all combinations of beamwidths and

path geometry, assuming that symmetrical beams are used on both ends of the path and that atmospheric turbulence

is isotropic. The result appears as a function of both of the beamwidths, in addition to other parameters, and

thus the loss in gain cannot be determined independently

for the transmitting and receiving antennas. The values

of the loss in gain are generally lower than the previous

estimates for which a comparison is possible. 14 p. Effect of atmospheric horizontal inhomogeneity upon ray

tracing, B. R. Bean and B. A. Cahoon The tracing of radio rays is normally carried out under

the assumption that the refractive index varies only in the

vertical direction. Although this assumption appears to be quite reasonable in the average or climatic sense, it is seldom satisfied under actual conditions and is strongly

violated by horizontal airmass changes occurring near

frontal and land-sea interfaces. This latter case is investi- gated by tracing rays through two instances of observed

marked'horizontal variation of the refractive index. The

bending for these ray paths was then compared with values obtained under the normal assumption of horizontal homogeneity. Although at 1 kilometer and above these horizontal changes appear to have little effect, rays emitted at low

elevation angles are sensitive to extreme horizontal variations of the atmosphere near the surface, such as those

associated with ducting conditions. However, since it appears that such conditions occur less than 15 percent of the time at most locations, the majority of ray-path

calculations may be carried out under the normal assumption of horizontal stratification of the refractive index.

6 p. On the correlation of solar noise fluctuations in harmonically related bands, L. R. 0. Storey A method is proposed for the study of the solar corona, by observing a delayed correlation between rapid fluctuations of enhanced solar radio emission in harmonically re- lated frequency bands. The correlation is expected in those types of emission that are produced by nonlinear plasma oscillations. The delay of the fundamental fre- quency with respect to the harmonic would be brought

about by dispersive group retardation in the corona. The

method appears to be most suitable for use with type II

bursts, though it might also be applied to other types of nonthermal solar emission. 4 p. A monochromatic low-latitude aurora, F. E. Roach and

E. Marovich A monochromatic (6300 A) auroral arc occurred over Colorado on September 29/30, 1957. It seems to have

been a continuation of a similar arc observed at Haute

Provence, France, on the same night. Its intensity de- creased during the night from about 7,000 rayleighs to 2,000 rayleighs compared with a normal zenith intensity

of 100 to 200 rayleighs. It was relatively fixed (geo- graphically) during the night, south of and apparently independent of a visual aurora that was active to the north from 0100 to 0400 m.s.t. The magnetic dipole lines of

force from the arc extend out into space between the two Van Allen radiation belts. It is speculated that the arc may be associated with one of the belts. 5 p.

Pattern synthesis for slotted-cylinder antennas, J. R. Wait

and J. Householder The radiation from a cylinder excited by an array of

axial slots is discussed. A procedure for synthesizing a given radiation pattern is developed with particular attention being paid to a Tchebyscheff-type pattern. Specifying the side lobe level and the width of the main

beam, the required source distributions are computed for a number of cases. The effect of using a finite number of

slot elements to approximate the continuous source dis- tribution is also considered. Central Radio Propagation Laboratory exponential refer- ence atmosphere, B. R. Bean and G. D. Thayer The background and development of an exponential model of atmospheric radio refractivity, the "C.R.P.L.

Exponential Reference Atmosphere" is outlined. A set of ray tracings for the model is presented in the form of tables of refraction variables for the complete range of observed values of surface refractive index. A detailed

analysis of the accuracy of the ray tracing and tabulation methods is made for these tables. The variables are presented as numbers between one and ten multiplied by

the appropriate power of ten, thus maintaining a maximum

number of significant figures. The tables may be used

for the solution of practical refraction problems involving

elevation angle errors, range errors, and similar quantities. 3 p. Excitation mechanisms of the oxygen 5577 emission in the upper atmosphere, E. Tandberg-Hanssen and F. E. Roach

Possible excitation mechanisms for the green 5577

emission are considered in the light of recent data on the dynamics of the upper atmosphere. Photochemical re- actions as affected by mass motions as well as excitation

directly due to the mass motions are analyzed. It is con- cluded that either or both mechanisms could probably

account for the observed emission. 6 p. A method for measuring local electron density from an

artificial satellite, L. R. O. Storey A method is proposed for measuring the electron density

at known points in the outer ionosphere, by the use of vlf receiving equipment in an artificial satellite, in conjunction with a vlf transmitter on the ground. The transmitter would radiate continuous waves, which would be propa- gated through the ionosphere in the "whistler" mode. The basis of the method is a measurement of the local wave

admittance of the medium, by comparison of the signals received on an electric dipole and on a loop. A further proposal is made for an integrated vlf satellite experiment, in which several different types of observation would be made simultaneously. 16 p. TITLE PAGE AND CONTENTS TO VOL. 63D. 4 p. PAPERS FROM THE JOURNAL OF RESEARCH OF THE NA- TIONAL BUREAU OF STANDARDS, SECTION D. RADIO

PROPAGATION, VOLUME 64D, JANUARY—JUNE 1960

Effect of antenna size on gain, bandwidth, and efflciencv, R. F. Harrington A theoretical analysis is made of the effect of antenna

size on parameters such as gain, bandwidth, and efficiency. Both near-zone and far-zone directive gains are considered.

It is found that the maximum gain obtainable from a broad- band antenna is approximately equal to that of the uni- formly illuminated aperture. If higher gain is desired, the antenna must necessarily be a narrow-band device. In fact, the input impedance becomes frequency sensitive so rapidly that, for large antennas, no significant increase

in gain over that of the uniformly illuminated aperture is

51
possible. Also, if the antenna is lossy, the efficiency falls rapidly as the gain is increased over that of the uniformly

illuminated aperture. 12 p. Surface-wave resonance effect in a reactive cylindrical structure excited by an axial line source, A. L. Cullen

It is shown that a purely reactive cylinder excited by a neighboring line source can, under suitable conditions, give rise to a radiation pattern closely approximating the

function cos n 6. In a numerical example, a cylinder of three transverse

electro-magnetic (T.E.M.) wavelengths circumference has

a surface reactance chosen to emphasize the term cos 6 0 in the Fourier series of the resultant radiation pattern. It

is shown that only 1.1 percent of the total power delivered

to the line source is radiated in unwanted modes.

It is also shown that the position of the line source does not affect this result to first order provided that

k(b — a)«l, where 6 — a is the distance of the line source from the cylindrical surface. 7 p. Basic experimental studies of the magnetic field from

electromagnetic sources immersed in a semi-infinite con- ducting medium, M. B. Kraichman

Using electromagnetic sources, consisting of various

dipoles and loops immersed in a concentrated sodium

chloride solution, measurements were made verifying the magnetic field propagation equations in air, derived pre- viously by several authors. The receiver was farther away from the source than a wavelength in the conducting medium, but much closer than a wavelength in air. An expression is derived giving the value of the magnetic

field in air due to a rectangular loop with a horizontal

axis by assuming the loop to consist of two electric dipoles corresponding to the horizontal members. Experimental

data verifying this expression are presented.

Also, using submerged electric dipoles, measurements

were made of the magnetic field in air which show that

the field is determined solely by the current in the hori- zontal radiating wires of the dipoles. 5 p. A very-low-frequency antenna for investigating the iono- sphere with horizontally polarized radio waves, R. S. Macmillan, W. V. T. Rusch, and R. M. Golden The advantages of a horizontal half-wave resonant antenna for very-low-frequency propagation experiments

lie in its relatively simple and inexpensive construction and in its radiation pattern which is maximum in the

vertical direction. The radiation fields of this type of antenna located at the surface of a conducting earth

consist of: 1, A horizontally polarized space-wave field radiated in the perpendicular bisector plane of the antenna; and 2, a vertically polarized groundwave field radiated along the axis of the antenna. This vertically polarized

field is zero at right angles to the antenna. These fields have been experimentally verified. The use of a 50-kilocycle horizontal half-wave antenna

for vertical-incidence ionospheric sounding experiments is described. The radiation pattern of this antenna is well suited for ionospheric soundings since a receiver located

in the groundwave null receives only the reflected sky- wave signal. Ground-resistivity measurements made at a number of locations in Central and Southern California were corre- lated with the geology of the terrain. This correlation showed that the ground resistivity is highest (a condition necessary for optimum antenna efficiency) in areas where

the underlying rock formations are relatively unfractured. The amount of annual rainfall and other climatic conditions have little or no effect on the resistivity. Finally, a unique antenna system is presented which

employs resonant loading circuits to convert a section of an existing power line into a horizontal half-wave verv- low-frequency transmitting antenna. 9 p.

Effects of high-altitude nuclear explosions on radio noise, C. A. Samson

High-altitude nuclear explosions over Johnston Island

in August 1958 appear to have had a rather pronounced

effect on the radio noise recorded at Kekaha, Hawaii. Graphs are presented showing the hour-to-hour variation

of the noise during August at eight frequencies from 13 kc to 20 Mc. All frequencies seem to have been affected, and the drop in received noise power amounted to as much as 32 db in the hour following the first explosion. The period of time over which abnormal noise conditions were observed suggests that high-altitude nuclear explosions may have a rather persistent effect on radio communications at certain frequencies. 4 p. Measured frequency spectra of very-low -frequency atmospherics, T. Obayashi New spectroscopes recording continuously the ampli- tude-frequency spectra of vlf atmospherics have been

developed. Two receivers cover the frequency ranges 1 to 10 kc and 5 to 70 kc sweeping the respective bands

repeatedly, and their outputs are displayed on intensity modulated cathode-ray tubes which are photographed on

slowly moving film. Observations have been carried out since June 1958, and it appears that the results provide an excellent exper- imental basis for comparisons with the mode theory of

vlf ionospheric propagation. It is found that the fre- quency spectrum of distant atmospherics indicates a pronounced absorption near 3 to 5 kc, a broad intensity maximum around 10 to 20 kic, and a general decrease towards higher frequencies with undulating peaks. The

selective absorption bands appearing in the spectrum are variable according to the time of day and seasons. These

changes may be interpreted loosely as an ionospheric effect which is associated with the cutoff frequency of the waveguide bounded by the earth and the ionosphere. The

solar flare effect on vlf atmospherics propagation is also revealed, which indicates a sudden shift of the spectrum

to higher frequencies owing to the increase of ionization and the lowering of a reflecting height of the ionosphere.

8 p. . Determination of the amplitude-probability distribution

of atmospheric radio noise from statistical moments, W. Q. Crichlow, C. J. Roubique, A. D. Spaulding, and W. M. Beery During the International Geophysical Year, the National Bureau of Standards established a network of atmospheric

noise recording stations throughout the world. The ARN-2 noise recorder at these stations measures three

statistical moments of the noise: average power, average

voltage, and average logarithm of the voltage. An empirically-derived graphical method of obtaining an

amplitude-probability distribution from these three moments, and its development, is presented. Possible

errors, and their magnitudes, are discussed. 8 p. Measurements of coastal deviation of high-frequency

radio waves, C. W. McLeish The angular deviation of the phase front of a wave

propagated across a fresh water shoreline has been measured over the frequency range from 3 to 20 Mc. The

deviation is found to be roughly half that which theoretically would be obtained if the same sites were adjacent

to infinitely conducting surfaces. 3 p. An exact earth-flattening procedure in propagation around a sphere, B. Y.-C. Koo, and M. Katzin By a refinement of the procedure used in the usual

earth-flattening approximation, the problem of propagation around a spherical earth is reduced to an exact 52
equation of the same form. Thereby the earth-flattening procedure becomes applicable to arbitrarily large heights and distances. It is also found that existing solutions of the approximate equations can be re-evaluated to yield the exact solutions for slightly different refractive index

distributions. 4 p. Limit of spatial resolution of refractometer cavities, W. J. Hartman

Filter factors that determine an upper limit for the wave numbers for which refractometer measurements

can be used to calculate the spectrum of refractivity are derived in this paper based on the assumption that re- fractometers measure a weighted average of the refractive index in a volume of air surrounding the center of the

refractometer cavity. Two models are used assuming

the weighting function has spherical symmetry around

the center and one model is used assuming the function has cylindrical symmetry. All models result in a simple mathematical form which should be easy to use in further

theoretical developments. 8 p. Conference on arctic communication, R. C. Kirby and

C. G. Little News and commentary on arctic communication conference. 8 p. Tropospheric scatter propagation and atmospheric circulations, W. F. Moler and D. B. Holden

Transhorizon vhf and uhf fields exhibit deep fades or

large signal enhancements of several hours' duration, as the propagation mechanism alternates between partial

reflection and scattering caused by turbulent dielectric fluctuations in the atmosphere. Such alternations occur when strong refractive layers develop below 3,000 ft. Surface wind streamline analyses show that mesoscale

centers of convergence or divergence cause local redis- tribution of refractve layering, tending to produce the

change from one mechanism to the other. Current scattering theory and the empirical findings of others are examined to determine the gross meteorological

factors that influence changes in scattered fields. The two

variables in the turbulent scattering coefficients, the

scattering angle and the intensity of dielectric fluctuations

at high wave numbers, are found to be dependent upon

the refractive layering and the thermal stability of the

airmass. It has been shown elsewhere that refractivity and stability are principally functions of the vertical velocity in the atmosphere. * It is shown here that the

direction and relative magnitude of the vertical velocity can be inferred from the upper-tropospheric wind velocity divergence. Received scattered signals are found to be

well correlated with computed velocity divergence.

It is suggested that the variations of scattered signal

level or range can be predicted in a routine manner by

regular meteorological personnel using ordinarily available meteorological data. 13 p. Layered earth propagation in the vicinity of Point Barrow,

Alaska, G. M. Stanley The relative field strength of a vertically polarized low-frequency radio signal was measured as a function

of distance over several radial paths in the vicinity of Point Barrow, Alaska. The attenuation of the recorded

signal was very much less than predicted by the theory

of propagation of a ground wave signal over a plane, homogeneous, infinitely conducting earth. The analysis

of these data in terms of a plane, layered, finitely con- ducting earth appears to resolve the anomaly. 3 p.

March-April 1960 Optimum frequencies for outer space communication,

G. W. Haydon

Frequency dependence of radio propagation and other

technical factors which influence outer space communications are examined to provide a basis for the selection of frequencies for communication between earth and a space

vehicle or for communication between space vehicles. 5 p. The joint use of the ordinary and extraordinary virtual height curves in determining ionospheric laver profiles, L. R. O. Storey An extension of Budden's matrix method for determining

ionospheric layer profiles is described. When analyzing

vertical incidence ionograms by the matrix method, it is usual to interpret the virtual height curve for the ordinary mode only. Errors then arise from the presence in the lower ionosphere of low-density ionization for which the plasmafrequency is less than the lowest frequency observed. In the proposed extension of the method, such errors are reduced by making use of the extraordinary virtual height curve as well as of the ordinary. 14 p. Measured statistical characteristics and narrow-band tele- type message errors on a single-sideband 600-mile-long ultrahigh-frequency tropospheric radio link, E. F. Flor- man and R. W. Plush Measurements of a 417 megacycles per second un- modulated radio carrier over a 600-mile tropospheric path

indicated that the variations of the received carrier en- velope amplitude with time over 30-minute periods roughly approximated a Rayleigh distribution in the majority of the tests. Cumulative time distributions of the carrier fade durations were obtained over a range of carrier en- velope power levels and were found to resemble corre- sponding distributions for narrow band thermal noise. The fade rate of the carrier envelope, at the median power

level, was less than 0.2 cycle per second; this comparatively low fade rate is thought to be due mainly to the narrow

(1°) antenna beam widths that were used and the con- sequent low order of multipath propagation of the radio waves. The half hour median power levels of the received

carrier varied over a range of approximately ± 8 decibels. The effective low-pass bandwidth of the carrier envelope spectrum was found to vary from 0.06 to 0.17 cycle per

second. The measured median transmission loss was

approximately 183 decibels which is within 3.5 decibels of the calculated value for the summer afternoon hours covered by the tests. With antennas spaced (normal to the path) at each end by 150 wavelengths it was found that parallel-path, divergent-path, or convergent-path types of transmission gave cross-correlation coefficients of the carrier envelopes which ranged from 0.08 to 0.20. For the same antenna

spacing but using crossed-path type of transmission, the

cross-correlation coefficient was 0.57. Diversity measure- ments of single-path crossed polarization type of trans- mission indicated that the cross-correlation coefficient of the carrier envelopes was very close to unity. Nondiversity narrow-band FSK error measurements

indicated that an 18-decibel signal-to-noise power ratio over an effective bandwidth of 290 cycles per second (at the limiter-discriminator input) for a fading signal resulted

in 0.8 percent binary errors and 4.0 percent teletype character errors. Extrapolation of these results indicates that a signal-to-noise ratio of 27 decibels is required to reduce the teletype character error rate to 0.1 percent in the same effective bandwidth. 9 p. Impedance of a corner-reflector antenna as a function of the diameter and length of the driven element, A. C. Wilson Impedance measurements have been made for a monopole in a corner reflector over an image plane as a function

of the monopole length, diameter, and position within the

corner-reflector structure. The results are presented as a family of curves which should be useful in the design of the driven element for a corner-reflector antenna of the

size described in this paper and for other corner-reflector antennas with similar parameters. 3 p. 53
The electric field at the ground plane near a top-loaded monopole antenna with special regard to electrically small L- and T-antennas, H. L. Knudsen and T. Larsen The present article deals with the calculation of the

electric field strength at the ground plane near electrically small top-loaded antennas having a known current dis- tribution, with special reference to L- and T-antennas. The formulas and numerical values obtained here for this component may be used in calculating the contribution to the ground losses around an antenna of the above-mentioned type due to the vertical component of the earth

current. An exact expression involving an integral has been

obtained for the electric field strength at the ground plane due to the current in a linear antenna having an arbitrary

inclination. If the length and the height of the antenna

is small compared to the wavelength, and if the current

distribution on the antenna can be expressed by a finite number of terms of a power series, it is theoretically possible to obtain a closed expression for the field at the ground plane. However, only in special cases does this expression become sufficiently simple to be of practical value for numerical calculations. Working formulas have been obtained and numerical

calculations carried out for the near zone field of an elec- trically small vertical or horizontal antenna with a linear current distribution. Based on these results, a calcula- tion has been made of the electric field strength at the ground plane near electrically small L- and T-antennas.

Also the relative contribution to this component due to

the top loading has been calculated. 13 p. Terrestrial propagation of very-low-frequency radio waves. A Theoretical Investigation, J. R. Wait A self-contained treatment of the waveguide mode

theory of the propagation of very-low-frequency radio waves is presented. The model of a flat earth with a

sharply bounded and homogeneous ionosphere is treated

for both vertical and horizontal dipole excitation. The

properties of the modes are discussed in considerable detail. The influence of earth curvature is also considered by

reformulating the problem using spherical wave functions

of complex order. The modes in such a curved guide are investigated and despite the initial complexity of the

general solution, many interesting and limiting cases may

be treated in simple fashion to yield useful and convenient

formulas for calculation. Other factors considered are the influence of the earth's magnetic field, antipodal effects, resonator type, oscilla- tions, and the influence of stratification at the lower edge

of the ionosphere. 52 p. Aurora of October 22/23, 1958, at Rapid City, South

Dakota, F. E. Roach and E. Marovich

During the night of October 22/23, 1958, auroral activity

at Rapid City, South Dakota, included (a) a visible aurora

in the northern part of the sky and; (b) a "monochromatic" (6300 A) arc through the zenith with an azimuth

12° from east-west (geomagnetic;. The intensity changes

of the arc were independent of the changes in the visible aurora. It moved slowly southward during the night cor- responding to a linear speed of about 8 meters per second

if its height is 300 kilometers. It is suggested that it is a member of a family of monochromatic arcs which have

until recently escaped detection because their red color makes them invisible even though intrinsically intense. 5 P. May-June 1960 A theory of radar scattering by the moon, T. B. A. Senior and K. M. Siegel A theory is described in which the moon is regarded as a "quasi-smooth" scatterer at radar frequencies. A scat- tered pulse is then composed of a number of individual

returns each of which is provided by a single scattering

area. In this manner it is possible to account for all the major features of the pulse, and the evidence in favor of

the theory is presented. From a study of the measured j power received at different frequencies, it is shown that the f scattering area nearest to the earth is the source of a specular return, and it is then possible to obtain information about the material of which the area is composed. The electromagnetic constants are derived and their significance discussed. 13 p. A theory of wavelength dependence in ultrahigh frequency

transhorizon propagation based on meteorological con- , siderations, R. Bolgiano, Jr. Recent radio data indicate that the wavelength de- pendence of ultrahigh frequency transhorizon propagation

varies widely in Jme. This is in contradiction with theoretical explanations previously set forth. Each attempt to I account for the underlying effects of ever-present atmos- i pheric motions has, in the past, pointed toward a unique form of the dependence. Extensive discussions have I

resulted as to the validity and relative merits of the various |

forms, but at no time has a variable wavelength dependence

| been proposed.

Since scatter propagation theory has predicted so satis- factorily the broad aspects of the radio signals, it is rej tained as the basis for further analysis. A new model is developed for the structure of refractive index fluctuations 1 induced by turbulence. Grounded on a theory of homogeneous turbulence in a stably stratified atmosphere, ! I which has been developed concurrently by the author, this 1 new model provides an explanation for the observed distri- bution of wavelength dependence. It suggests that at times when the dynamic stability of the air within the

scattering volume is neutral the received power should be

nearly independent of radio wavelength. On the other hand, when the atmosphere is dynamically stable the signal strength should be proportional to the square, or higher power, of the wavelength. These predictions have been tested by comparing the 1 results of a scaled-frequency experiment with simultaneous I meteorological data gathered along the path. Richardson's i number for the 1- to 3-kilometer layer, within which the

principal scattering volume lies, has been employed as an

index of dynamic stability, though it falls short of ideal in some respects. The 0.8 value of correlation found between ' Richardson's number and the wavelength dependence is I highly suggestive that a relation of the nature predicted

does, in fact, exist. 7 p. A preliminary study of radiometeorological effects on J beyond-horizon propagation, F. Ikegami A study was made of American and Japanese radio- meteorological data in order to suggest the dominant

' factors in propagation beyond the horizon. The diurnal i variability of radio field strengths seems to be sensitive to I the crossover height of rays tangent to the radio horizon and disappears for crossover heights greater than about 500 | meters. High hourly median field strengths were observed

in Japan corresponding to the existence of a marked

j refractive index discontinuity layer in a common volume i of two antenna beams. The results of these experiments

suggest that laminar structures of the atmosphere play an i important role in beyond-horizon radio propagation. 8 p. 1 The trade-wind inversion as a transoceanic duct, M.

| Katzin, H. Pezzner, B. Y.-C. Koo, J. V. Larson, and j J. C. Katzin Radiosonde data for stations in the South Atlantic ' trade-wind belt are analyzed to determine the potentialities of the trade-wind inversion as an elevated duct for trans- I oceanic radio transmission. These were supplemented by i refractometer soundings made by an aircraft during the j latter part of 1958. These records indicate that a duct is • present in the majority of the cases. Since it is known | that the radiosonde underestimates ducting because of its : i slow response, it is concluded that a duct is present practically all the time. On the basis of the data analyzed, an

j experiment with two aircraft is suggested to test the i propagation potentialities of this mechanism. A fre- 54
quency of around 200 megacylces per second appears to be

a good choice for an initial experiment. 7 p. An analysis of propagation measurements made at 418

megacvlces per second well bevond the radio horizon

(a digest), H. B. Janes, J. C. Stroud, and M. T. Decker

During an lS-month period in 1952 and 1953, transmission loss measurements at 418 megacycles were made over

a 134-mile path between Cedar Rapids, Iowa, and Quincy,

Illinois. Continuous recordings made simultaneously at

several receiving antenna heights from 30 to 665 feet yielded information on diurnal and seasonal variations in both the hourly median basic transmission loss and in height gain. These data are compared to predictions made using the method developed by Rice, Longley, and

Norton and are found to be in good agreement, particularly

at the lower antenna heights. An analysis of the correla- tion of short-term signal level variations observed at horizontallv and vertically spaced antennas is described. 3 p. On the calculation of the departures of radio wave bending from normal, B. R. Bean and E. J. Dutton The calculation of nonnormal tropospheric bending of radio waves is treated in terms of a reduced-to-sea-level value of the refractive index. This method emphasizes

departures of bending from the average bending for the United States and consists of visualizing ray bending as consisting of two parts; an "average" component and

a "departure-from-average" component. The "average" component comprises most of the bending and is obtained

accurately from refraction tabulations while the component

due to departures is easily obtained by graphical means.

5 p. On the mode theory of very-low-frequency propagation in the presence of a transverse magnetic field, D. D. Crombie The effect of a purely transverse horizontal magnetic

field on the propagation of very-low-frequency (vlf) waves

is considered. It is shown that the magnetic field intro- duces nonreciprocity, and that for propagation along the magnetic equator, the rate of attenuation is less for westto-east propagation than for east-to-west propagation.

3 p. On the theory of reflection of low- and very-low-radio- frequency waves from the ionosphere, J. R. Johler and

L. C. Walters The regiorous application of the magneto-ionic theory

to the calculation of reflection coefficients for a sharply bounded ionosphere model is carried out. The paper is illustrated with computations applicable to the Z)-region or the .E-region of the ionosphere. The quasi-longitudinal approximation is derived from this theory and the range

of validity of this approximation is illustrated. The

restrictions imposed by the use of a sharply bounded model

ionosphere are discussed. 18 p. Focusing, defocusing, and refraction in a circularly

stratified atmosphere, K. Toman

Focusing, defocusing, astronomical refraction and path

length of rays as a function of the departure angle A of the ray at the source is described for cases with the source

outside, inside, or on the boundary of a circular stratification. Relative to zero elevation angle symmetrical and

centrosymmetrical distributions are found. 2 p. Response of a loaded electric dipole in an imperfectly conducting cylinder of finite length, C. W. Harrison, Jr., and R. W. P. King

Analytical relationships are developed which permit

calculation of the power in the load impedance of an

electric probe, symmetrically located within an imperfectly conducting cylinder of small radius compared to the wavelength, in terms of the electric field incident upon the cylinder. 5 p. Impedance characteristics of a uniform current loop having a spherical core, S. Adachi The radiation impedance is derived by the electromotive

force method in a convenient form as the sum of the self- radiation impedance of a loop in the free space and an

additional term due to the reaction between the loop and

the sphere which is proportional to the well-known

expansion coefficient of a magnetic-type scattered wave

from a sphere in an incident plane wave. The first antiresonance frequency has been given in the form of a

universal curve for a very small uniform current loop with core of an arbitrary composition of /x s and e s , subject

to the condition that the refraction coefficient N=*Jn,e s is extremely large. Some numerical calculations show

that high -m core is desirable for a comparatively lower frequency region, and high -e core is rather desirable in an

antiresonance region. 5 p. 3.6. CIRCULARS

Circulars are compilations of information on

various subjects related to the Bureau's scientific and technical activities. They not only include the results of Bureau studies but give data of general interest from other sources. The Circular

series was discontinued in June 1959. After this date material that would formerly have been

published in the Circular series has been largely directed to the Journal of Research and the new

Monograph series (page 59). See "Price List

of Available Publications," page 161. C440 Supplement. Viscosities of sucrose solutions at various temperatures: Tables of recalculated

values, J. F. Swindells, C. F. Snyder, R. C. Hardy, and P. E. Golden The tables of viscosities of sucrose solutions appearing

in NBS Circular 440 were calculated, assuming the value

of the viscosity of water at 20° C to be 1.0050 centipoises. Subsequently, a redetermination of the absolute viscosity

of water at 20° C established the value 1.0020 centipoises. In addition, more precise values have been obtained for the calibration constants of the viscometers used in the

original measurements of sucrose solutions upon which

the tables were largely based. Incorporating these more

precise values, the above tables have been recalculated. July 31, 1958. 7 p. C467, Vol. III. Atomic energy levels, C. E. Moore The compilation of Atomic Energy Levels as derived from the analyses of optical spectra, exclusive of hyperfine

structure, has continued. Volume I of Circular 467, issued in 1949, contained data for 206 spectra of the first 23 elements in the periodic table, hydrogen through vanadium. The energy levels are listed by terms starting with the ground state zero. A uniform style of notation

is used, and for complex spectra arrays of observed terms

are included for comparison with similarly arranged

arrays of predicted terms, which are given in the Intro- duction for each isoelectronic sequence. For each spec- trum a brief discussion of the analysis is given, together with a detailed bibliography. Limits and ionization

potentials are given when known. Similarly, the configurations of the individual terms are included together with ^-values derived from the observed Zeeman patterns. Volume II issued in 1952, is similarly arranged. It includes data for 152 spectra of the 18 elements chromium

through niobium. 55
Volume III was issued in 1958, continuing the program

to heavier elements. This volume contains similar data

for 124 spectra of 32 elements, molybdenum through lanthanium and hafnium through actinum.

This completes the periodic table for the two groups of elements known as rare earth. The atomic spectra of these elements will be covered in Volume IV of Circular

467, which is now being started. These volumes contain much unpublished material and

are useful to workers in many fields of science. This program has stimulated work on spectrum analysis not

only in the laboratory but also among theoretical workers.

Circular 467, Volume I, June 15, 1949. 309 p. Circular

467, Volume II, August 15, 1952. 227 p. Circular 467, Volume III, May 1, 1958. 245 p. C539, Vol. 7. Standard X-ray diffraction powder patterns. Data for 53 substances, H. E. Swanson,

N. T. Gilfrich, and M. I. Cook

Fifty-three standard X-ray diffraction powder patterns

are presented. Forty-six are to replace sixty-two patterns already represented in the X-ray Powder Data File, and seven are for substances not previously represented. The X-ray Powder Data File is a compilation of diffraction patterns from all sources and is used for the identification

of unknown crystalline materials by matching spacing and

intensity measurements. In this Circular, comparison is made of all powder diffraction data available for each of the substances reported. The patterns were made with a

Geiger counter X-ray diffractometer, using samples of high purity. The d-values were assigned Miller indices determined by comparison with calculated interplaner spacings and from space group considerations. The densities and lattice constants were calculated, and the refractive indices were measured whenever possible. Included are X-rav data for the following fifty-three substances: A1C13 -6H'2 0, NH4 N03 , (NH4 ) 2 C2 04 H2 0, NH4CIO4, BaMoO-4, BaS, BaW04 , CdC03 , CdSe, CaCr04 , Ca(N03 ) 2 , CaS, Cs2 S04 , AuSb2 , AuSn, LaF3 , LaOCl, PbMo04 , PbW04 , LiI03 , LiN03 , MgC03 , MgS04 -7H2 0, MgS, MnC03 , Hg2 Br2 , HgSe, NiS04 -6H2 0, KBr03 , KCNO, K2 TiF6 , KI04 , KMn04 , RbBr, AgC103 , Ag2 Mo04 , Ag2 S04 , NaI03 , NaI04 , NaC104 , SrMo04 , SrS, SrW04 , NH3 S03 , Te02 , TIBr, T13 P04 , T1P04 , SnTe, CO(NH2 ) 2 , Zn2 Si04 , ZnS04 , and Zr(S04 ) 2 -4H2 0. September 27, 1957. 70 p. C539, Vol. 8. Standard X-ray diffraction powder patterns. Data for 61 substances, H. E. Swanson, N. T. Gilfrich, M. I. Cook, R. Stinchfield, and

P. C. Parks

Sixty-one standard X-ray diffraction powder patterns

are presented. Thirty-three are to replace thirty-nine patterns already represented in the X-ray Powder Data File, and twenty-eight are for substances not previously repre- sented. The X-ray Powder Data File is a compilation of diffraction patterns from all sources and is used for the

identification of unknown crystalline materials by matching spacing and intensity measurements. In this Circular, comparison is made of all powder diffraction data available

for each of the substances reported. The patterns were made with a Geiger counter X-ray diffractometer, using samples of high purity. The rf-values were assigned Miller

indices determined by comparison with calculated inter- planar spacings and from space group considerations. The

densities and lattice constants were calculated, and the

refractive indices were measured whenever possible. Included are X-ray data for the following sixty-one substances: Al2 03 -6CaO-3S03 -31H2 0, (NH4 ) 2 SeBr6 , (NH4 ) 2- TeBr6 , (NH4 ) 2 IrCl„, (NH4 ) 2 PdCl6 , (NH4 ) 2 TeCl6 , NH4 V03 , (NH4 ) 3 P04 (Mo03 ), 2 -4H2 0, Be2 Si04 , BiOBr, CaBr2 .6H2 0, Ca(HC02) 2 , CeF3 , CsBr03 , Cs2 PtBr6 , Cs2 SeBr6 , CsC103 , CsCr(S04 ) 2 12H2 0, CsBF4 , CsGa(S04 ) 2 -12H2 0, Er2 03 , GaP04 (a-quartz type), Ge02 (tetragonal), InP04 , Pb- (HC02 ) 2 , Pb3 04 (minimum), Pb5 (P04 ) 3 OH (lead hydroxyapatite), LiC104 -3H2 0, NdF3 , NdOCl, NiSiF„-6H2 b, NbSi2 , K2 PtBr6 , K2 SeBr6 , KRe04 , K3 P04 (Mo03 ) 12 .4H2 0,

KCNS, RbBr03 , Rb2 TeBr6 , RbC103 , Rb2 TeCl6 , Rb2 S04 , ScP04 , Agl (iodyrite), AgRe04 , Na2 C03 H2 0 (thermonatrite), Sr(HC02 ) 2 , Sr(CH02 ) 2 -2H2 0, SrI2 -6H2 0, TaSi2 , TlBr03 , T1C103 , T1I03 , T1CNS, Ti5 Si3 , WS2 , V2 06 , YP04 (xenotime), ZnC03 (smithsonite), ZnSiF9 -6H 2 0, and ZnS04 -7H 2 0 (goslarite). April 1, 1959. 76 p. C539, Vol. 9. Standard X-ray diffraction powder patterns. Data for 43 substances, H. E. Swanson, M. I. Cook, T. Isaacs, and E. H. Evans

Forty-three standard X-ray diffraction powder patterns

are presented. Thirty-one are to replace forty-one patterns already given in the X-ray Powder Data File, and

twelve are for substances not previously included. The

X-ray Powder Data File is a compilation of diffraction patterns from all sources and is used for the identification

of unknown crystalline materials by matching spacing and intensity measurements. In this Circular, comparison is made of all powder diffraction data available for each of the substances reported. The patterns were made with a Geiger counter X-ray diffractometer, using samples of high purity. The d-values were assigned

Miller indices determined by comparison with calculated interplanar spacings and from space group considerations. The densities and lattice constants were calculated, and

the refractive indices were measured whenever possible. Included are X-ray data for the following forty-three substances: <*-Al2 03 (corundum), NH4 N3 , (NH4 )HC03 (teschemacherite), (NH4 ) 2 PtBr6 , NH4 Re04 , (NH4 ) 2 S04 (mascagnite), Bt'Al .O, (chrvsobervl) , Bo3 Al,(Si03 )„ (bervl), BiOI, CdBr2 , CdCl2 12CaO-7Al2 03 , Ca3 Fe,Si3 012 (andradite), Cs2 TeBr6 , CsN03 , ,3-CrP04 , CoAl2 04 , CoO, Co3 04 , Dy2 03 , ErP04 , Ho2 03 , MgCr2 04 (picrochromite), MnAl2 04 (galaxite), MnFe2 04 (jacobsite), Mn2 03 (partridgeite), HgO (montroydite), Nd[(C2 H5 )S04 ] 3 -9H2 0, NiAl,04 , Ni2- Ge04 , KBH4 , K3 Co(NO2 ) 0 , K3 ZrF7 , PrOCl, 7 -AgI, AgI04 , NaBH4 , SrZr04 , S, Te02 (tellurite), Tm2 03 , TiO,.M s, and

Znl2 . February 25, 1960. 64 p. C552, 3d ed. Standard materials. Issued by the National Bureau of Standards A descriptive listing of the various Standard Materials

issued by the National Bureau of Standards is given. A

schedule of fees and weights, as well as directions for ordering, is included. Summarized tables of analyses

are presented, to indicate the type of standards of composition presently available. Announcements of new standards will be made in scientific and trade journals, and the

current status of the various standards will be indicated by an insert sheet issued with this Circular. April 8, 1959. 27 p. (Supersedes C552, 2d ed., April 15, 1957). C563, 1st Supplement. Periodicals and serials received in the Library of the National Bureau of Standards, August 1958, N. J. Hopper and H. W. Reinhart This supplement lists new periodical titles added to the

collection of the National Bureau of Standards Library from April 1955 to August 1958. It also includes changes

in title, titles that have ceased publication, and titles that

are no longer received. A list of Russian periodicals currently received, and also of translations of Russian periodicals, is included at the end of this publication. The footnote references are the same as those used in the original list. December 30, 1958. 10 p. C577 Supplement. Energy loss and range of electrons and positrons, A. T. Nelms

Tabulations of the mean energy loss due to ionization and excitation which include the density effect and the range derived from this quantity are given for electrons and positrons in several materials. July 30, 1958. 31 p.
C583 Supplement. X-rav attenuation coefficients from 10 kev to 100 Mev, R. T. McGinnies A revision is given of the X-ray attenuation coefficients presented in National Bureau of" Standards Circular 583. Table 4 of that publication is eliminated, and a new table

is given for each material for photon energies less than

100 kev. The uncertainties in the estimates of attenuation

coefficients at low energies are from 3 to 5 percent, which

is the same as was previously given at higher energies. The cross sections for scattering are unchanged. Two

values are listed for the photoelectric cross section, one

calculated from the Sauter-Stobbe formulas and the other

derived from new experimental evidence. The procedures

for smoothing experimental data are described and are

generally the same as were used in Circular 583. In

addition to the systematic coverage of the region from 10 kev to 100 Mev," some data are included for a number of elements based on experimental measurements below 10 kev and above 100 Mev. A comparison is made between

calculated and experimental total attenuation coefficients at energies above 10 Mev. October 30, 1959. 10 p. C584. Simulator for use in development of jet engine

controls, E. S. Sherrard A method of simulation and cost estimates of simulator components are given for a simulator to be used in the development of turbojet engine control systems for aircraft. The simulator employs typical d-c analog computer

components. It is capable of representing a twin-spool,

variable-nozzle, afterburning turbojet engine, as well as the engine's controller. The simulator is of moderate

accuracy, flexibility, and cost. It is intended to be used

in the determination of the stability and performance of the engine control system. September 16, 1957. 17 p. C585. The measurement of thickness, G. Keinath The numerous methods for the measurement of thickness

in laboratory or shop are treated in seven groups according

to physical operating principles: Mechanical—weight/di- mension relationships, acoustics, vibration, displacement

with various conversions; chemical—stripping, spectro- chemical analysis; electrical—dielectric breakdown, resist- ance, electrochemical, capacitance, thermoelectricity; magnetic—attractive force, reluctance, saturation, inductance, eddy currents; optical—microscopy (also electron microscopy), interferometry, diffraction, shadow; X-ray

absorption, diffraction backscatter, spectrometry; radioactive radiation—absorption, backscatter, tracers. Ranges,

accuracies, advantages, and limitations are discussed. A

bibliography of references, a limited list of suppliers, and

a detailed index of the gages, methods, applications, and

trade names covered are appended. January 20, 1958. 79 p. C586. Electric hygrometers, A. Wexler

This Circular is a review of the art of measuring the moisture content of air by the methods of electric hygrometry. The basis of these methods is the change in

electrical resistance of a hygroscopic material with change

in humidity. September 3, 1957. 21 p. C587. Electroforming of waveguide components for the

millimeter-wavelength range, A. A. Feldmann

The technique of electroforming has become very important in the production of precision waveguide components. In the millimeter-wavelength range it represents almost the sole method of construction for precision components. Given machine-shop facilities, normal laboratory facilities, and a few auxiliary items, electroforming of the best quality can be done without much difficulty. This is of particular importance to research workers in university or Government laboratories. Simple tech- niques are outlined that permit the production of highquality millimeter components with a minimum of equipment, time, or specialized knowledge of electrodeposition

November 15, 1957. 13 p. C588. Determination and correlation of flow capacities

of pneumatic components, D. H. Tsai and M. M.

Slawsky Some of the problems of measurement and correlation

of flow capacities of pneumatic components are discussed. A dimensionless "area factor," defined as the ratio of the

"effective area" of the component to some reference area (equation 7), is introduced. The physical significance of the area factor and its experimental determination are dis- cussed in some detail. Sample data are also included to show that this area factor provides a valid and convenient

basis for comparing the flow capacities of components,

regardless of their size and design, and over a wide range

of test conditions. October 15, 1957. 7 p. C589. Tables of dielectric dispersion data for pure liquids and dilute solutions, F. Buckley and A. A. Maryott

Primary dielectric dispersion data and characteristic dispersion parameters are tabulated for almost 200 substances in the liquid state and for dilute aqueous and non- aqueous solutions with more than 150 solutes. There are

6 tables and 1 section of graphs. There are 4 tables for pure liquids, 2 containing summaries of the derived dis- persion parameters and 2 containing the primary data. The section on graphs supplements the tables for pure

liquids and contains reproductions of pertinent data that

are available only in the form of graphs. November 1, 1958. 95 p. C590. Methods of testing thermocouples and thermocouple materials, Wm, F. Roeser and S. T. Lonberger Various methods used for testing thermocouples and

thermocouple materials and the precautions that must be observed in order to attain various degrees of accuracy

are described. In particular, the methods that have been

developed and used at the National Bureau of Standards

are outlined in detail, and some guidance is given to the

reader in the selection of the method best adapted to a given set of conditions. Consideration is given primarily to the calibration of platinum versus platinum-rhodium, copper-constantan, Chromel-Alumel, and iron-constantan thermocouples. February 6, 1958. 21 .p. (Supersedes RP768).

C591, Sect. 1. System design of digital computers at the National Bureau of Standards: methods for high- speed additions and multiplication

1. A logic for high-speed addition, A. Weinberger and

J. L. Smith A method is described whereby increased speed of operation in a binary digital adder is obtained by organizing the

electronic elements for the carry-generating network into a more efficient system. This" network is so organized

that certain special auxiliary functions of the digits in the two numbers to be added are formed during the early phases of the addition cycle. These auxiliary functions

are used during subsequent phases of the cycle to generate the carry digits in large groups simultaneously instead of generating each carry individually and sequentially as is the case in conventional adder designs. When associated with a suitably fast storage device, this type of adder permits the design of arithmetic processing

units that operate up to 150 times faster than earlier National Bureau of Standards computers, using the same

basic types of electronic elements.

2. Shortcut multiplication for binary digital computers

J. L. Smith and A. Weinberger A method for increasing the basic multiplication speed

of a computer is described in which certain time-consuming

57
but non-essential steps are omitted. Such steps are ordi- narily included when the elementary definition of binary

multiplication as a simple sequence of' repeated addition and single-position shift operations is applied in a straight- forward fashion. It is shown that most of these elementary

steps can be omitted for any continuous string of similar

digits that occurs in the multiplier number. Fullest ad- vantage of this can be taken if provision is made to per- form various multiposition shifts as rapidly as possible. Implementing the method requires the continual sensing

of several of the multiplier digits in advance in order to discover which of the elementary steps are non-essential and can be omitted. Speed factors of up to 3 over conventional methods can generally be obtained. February

14, 1958. 22 p. C592. Nickel and its alloys, J. G. Thompson A review is presented of available information about the

occurrence, recovery and refining, properties, and uses of high-purity and commercial forms of nickel, and about the

properties and industrial applications of its important

alloys. The Circular is a revision of National Bureau of Standards C485 issued in 1950. February 5, 1958. 87 p. (Supersedes C485). C593. The federal basis for weights and measures. A historical review of Federal legislative effort, statutes, and administrative action in the field of weights and measures in the United States, R. W. Smith A review is presented, for the period 1776-1956, very

largely in chronological form, of congressional efforts and

accomplishments in the general weights and measures

area, with particular emphasis on units and standards. Certain important and closely related administrative

actions initiated by Hassler and Mendenhall in the nine- teenth century are cited. Current Federal statutes having weights and measures significance are discussed

briefly. In its entirety the Circular presents a connected and reasonably comprehensive story of the Federal contribution to the legislative basis for weights and measures

administration in the United States. June 5, 1958. 23 p. C594. Preparation, maintenance, and application of standards of radioactivity, W. B. Mann and

H. H. Seliger The methods available for the preparation and mainte- nance of primary and secondary standards of radioactivity are reviewed, and the applications of such standards

to problems in physics are discussed. June 11, 1958. 47 p. C595. Tables of transport integrals /„(*)-

(^_^2

, W. M. Rogers and R. L. Powell The transport integrals, Jn (x), defined by

are utilized often in the development of theories describing the thermal conductivity, electrical conductivity, thermal

electromotive force, specific heat, and other similar trans- port properties of solids. The tables include values to six significant figures of the integral for the index integer n

ranging from 2 through 17, and for the limit of integration

x ranging from 0.1, by 0.1 intervals, to the limiting upper

value, that ranges from 25 for n=2 to 40 for w=17. The

three series utilized to represent the integral in different ranges are derived. The limiting values in the upper

range and the asymptotic series expansions in the lower

range are also given. Auxiliary tables include the values

of the Riemann Zeta numbers and Bernoulli numbers

utilized in the calculations. July 3, 1958. 46 p.

C596. Single-phase transfer of liquefied gases, R. B. Jacobs The problems encountered in the single-phase transfer

of liquefied gases are discussed in detail. A general system

of equations and the empirical information required for the design of long-distance transfer systems are presented. A closed-form solution of the mathematical equations

for incompressible flows is obtained and discussed. In- formation required for numerical computations involving

helium, hydrogen, nitrogen, and oxygen is presented in graphical form. The numerical solution for three general problems involving hydrogen and oxygen are obtained. December 1, 1958. 42 p. C597. Energy spectrum resulting from electron slowing down, R. T. McGinnies The process of electron slowing down is described quali- tatively and the resulting energy spectrum defined in terms of differential track length. A method developed by Spencer and Fano for the calculation of the electron spectra has been applied extensively by means of an auto- matic computer. The accumulation of secondary knock- on electrons is included in the calculations and bremsstrahlung losses are neglected. Tabulations of differential track length are given for aluminum, copper, tin, lead, air, water, bone, muscle, and polyethylene (C2 H4 ), with up to

17 source energies each. Source energies range from 10.46

million electron volts to 6.438 kilo electron volts. A tabulation of the probability for the production of knock-on

secondary electrons is also given. These data are an

abstract of a much larger tabulation, printed by the computing machine, which is available on loan from the library

of the National Bureau of Standards. February 20, 1959. 16 p. C598. Techniques for accurate measurement of antenna

gain, H. V. Cottony Comparison of published results of experimental antenna

measurements, particularly gains, reveals apparent dis- crepancies of the order of one or more decibels. Experi- mental work at the National Bureau of Standards on

scaled model antennas for long-range VHF communication

via ionospheric scatter revealed some sources of difficulties and led to the adoption of special precautions resulting in significantly more consistent and, it is believed, more

accurate results. The procedures are based on the comparison method but include, in addition to the standard

antenna, the use of a third antenna here designated as the

reference antenna. To obtain more accurate measure- ments it was found essential to correct for the standing wave pattern in the field set up, presumably, by reflections from the irregularities in the terrain. Special features of instrumentation, including methods for minimizing and

measuring matching losses, are described. The accuracy

of the techniques has been verified by measuring the gain

of an antenna, the value of which could be accurately

calculated. December 1958. 10 p. C599. On the theory of fading properties of a fluctuating

signal imposed on a constant signal, H. Bremmer

This paper deals with a theoretical investigation of the fading properties of a signal composed of a fluctuating contribution, and another steady contribution with

fixed amplitude and phase. It is assumed that the central

limit theorem may be applied to two proper quantities describing the fading signal as a quasi-monochromatic

function of the time. The results are applicable to any

autocorrelation function for the fluctuating contribution. The first part of the paper (sections 1 to 16) is mainly

restricted to the idealized case in which any two components of the fluctuating part of the complete signal that

are in quadrature with respect to their phase do have

identical statistical properties; the fluctuating part is then termed a "random" signal. This idealized case is shown

to constitute but an approximation if applied to the

fluctuating field due to first order scattering in a turbulent 58
atmosphere. Therefore, in the second part of the paper

(sections 17 to 20) the theory has been extended to fluctu- ating contributions (then termed "quasi-random" contri- butions) not satisfying the above condition of isotropy.

All results then depend on two complex correlation functions ci(t) and 1>{t) instead of on the single function a(r) governing the simplified theory. In contrast to a(r), the

function b(r) does not exclusively depend on the energy spectrum of the fluctuating contribution. The fading properties investigated for the composed

signal are the distribution functions of both the amplitude and phase, as well as the average number of crossings of each of them (per unit time interval) through any given

level. The complicated general formulas reduce to simple expressions in the two extreme cases of (a) absence

of the steady signal (e.g., tropospheric scatter propagation

to distances far beyond the transmitter's horizon), and

(b) predominance of the steady signal (e.g., line of sight propagation to distances well within the horizon). The

first limiting case leads, when neglecting the influence of

6(t) (then being very small), to the well-known Rayleigh

distribution for the amplitude, to a homogeneous distri- bution for the phase, and to a fading rapidity (defined as the average number of crossings per unit time interval through the level most frequently passed) which is for the amplitude faster than for the phase by a factor of 3.04. The second limiting case amounts to normal distributions

for both amplitude and phase, and to fading rapidities of these quantities which are only identical insofar as the

different behaviour of the in-phase and in-quadrature component (with respect to the steady signal) does have

no numerical importance. On the other hand, measure- ments of the difference in the amplitude-fading rapidity and the phase-fading rapidity will reveal the effect of the asymmetry with respect to the two mentioned components

of the scattered signal. May 25, 1959. 32 p. C600. Calibration of liquid-in-glass thermometers, J. F. Swindells This Circular contains information of general interest to both manufacturers and users of liquid-in-glass ther- mometers, as well as those who wish to calibrate thermometers or submit them to the National Bureau of Standards

for calibration. Important elements of thermometer

design are discussed, and eligibility requirements for

certificates or reports of tests are given. Factors affecting the use of common types of liquid-in-glass thermometers

are included together with tables of tolerances andresonably attainable accuracies. The calculation of corrections

for the temperature of the emergent stem is given in detail

for various types of thermometers and conditions of use. The Circular also describes the techniques and equipment

used in the calibration procedures and provides instructions for applicants requesting thermometer calibration

services. January 8, 1959. 21 p. (Supersedes C8). C601. Recorder survey: recording surfaces and marking

methods, G. Keinath

This Circular surveys the characteristics and comparative advantages of continuous traces, dotted traces, and

printed characters, as produced by inking, incision, impression, indentation, deposition, heat, light, electric discharge, electron beam, magnetism, chemical action, or fluid streamlines. Descriptive and reference material

is included on three physical components of the recording system—the reservoir of material or energy, the marking

point or matrix positioned by the measuring element, and

the chart surface which preserves the record. September 1, 1959. 41 p. C602. Testing of glass volumetric apparatus, J. C. Hughes

This Circular contains specifications and tolerances for

glass volumetric apparatus of precision grade. Detailed

information is given as to dimensions, graduations, in- scriptions, and tolerances for burets, pipets, flasks, cylindrical graduates, and certain kinds of special apparatus.

A description of test methods used and the reports furnished and directions for submitting apparatus are

included. April 1, 1959. 14 p. (Supersedes C434). C603. Stark broadening functions for the hydrogen lines, A. B. Underhill and J. H. Waddell

Numerical values of the intensities of the Stark components of the hydrogen lines and the Stark broadening

functions, S(a), are presented for all series members up

to and including n= 18. The S(a) functions are tabulated

for lines of the Balmer, Lyman, Paschen, and Brackett

series of hydrogen. The data can be used to compute

self-consistent profiles of the hydrogen lines in stellar spectra. May 1, 1959. 94 p. 3.7. MONOGRAPHS

Monographs are usually contributions to the

technical literature which are too lengthy for publication in the Journal of Research. They

often provide extensive compilations of information on subjects related to the Bureau's technical program. Until July 1959 most of this type of material was published in the Circular series (page

55). See "Price List of Available Publications," page 161. Mono. 1. Energy dissipation by fast electrons, L. V. Spencer

Tabulations are given of the energy dissipated by fast electrons at different distances from monoenergetic elec- tron sources, for plane perpendicular and point isotropic sources. A summary of the theoretical methods and data

utilized, and a table of spatial moments are also included. September 10, 1959. 70 p. Mono. 2. Temperature-induced stresses in solids of ele- mentary shape, L. H. Adams and R. M.

Waxier

In general, a solid subjected to non-uniform temperature change develops internal stresses. These are determined

by, (1) the temperature distribution within the solid, and

(2) certain physical constants of the material. Although

the necessary fundamental relations are known, the computation of stresses in even simple solids has heretofore been a tedious operation. For two varieties of heating, the equations determining stress have now been put in convenient form for practical use, and tables of certain temperature functions are offered as a means of quickly determining stresses in a slab, in a cylinder, or in a sphere subjected to either of two modes of heating. The temperature-distribution tables independently will provide a

useful means for the ready estimation of temperature

gradients. June 21, 1960. 27 p. Mono. 3, Vol. I. Table of wavenumbers, 2000 A to 7000 A, and Vol. II. Table of wavenumbers, 7000 A

to 1000 n, C. D. Coleman, W. R. Bozman,

and W. F. Meggers A two-volume table for converting wavelengths in standard air to wavenumbers in vacuum was computed

by using the equation er vac = 1/X(n air ), where n was computed from Edlcn's 1953 equation for the refractive index

of air. Wavenumbers are given to the nearest 0.001 K(cm-') for wavelengt hs from 2000 to 7000 A in Volume I, and 7000 A to 1000 ix in Volume II. Proportional tables are given for linear interpolation between entries of X. Also included are the vacuum increase in wavelength,

X(n-l); and the refractivity of standard air in the form

(n-1) 1000. Mono. 3, Vol. I, Mav 2, 1960. 500 p. Mono. 3, Vol. II, May 16, 1960. 534 p. 569918 0—61 5 59
Mono. 4. CRPL exponential reference atmosphere, B. R. Bean and G. D. Thayer The background and development of an exponential model of atmospheric radio refractivity, the CRPL Exponential Reference Atmosphere, is outlined. ' A set of ray tracings for the model is presented in the form of tables of refraction variables for the complete range of observed values of surface refractive index. A detailed

analysis of the accuracy of the ray tracing and tabulation methods is made for "these tables. The variables are presented as numbers between 1 and 10 multiplied by

the appropriate power of 10, thus maintaining a maximum

number of significant figures. The tables may be used

for the solution of practical refraction problems involving

elevation angle errors, range errors, and similar quantities. October 29, 1959. 67 p. Mono. 5. Preservation of documents by lamination, W. K. Wilson and B. W. Forshee The chemical stability and physical properties of cellulose acetate film used to preserve and restore old or damaged documents by lamination were investigated. Pretreatment of documents with alkaline media before lamination is desirable if the paper contains an appreciable amount of acid. The lamination process does not degrade

cellulose acetate film to a measurable extent. Acid-free papers are not degraded during lamination, but papers

containing acid are degraded in proportion to the amount

of acid present. Tissue added to the laminate increases the tensile strength and internal tear resistance, but

decreases edge-tear resistance as compared to that of film alone extending beyond the paper. The loss of plasticizer with time from a cellulose acetate laminating film does not impair the properties of the

laminate. Composition and performance specifications

for a cellulose acetate laminating film suitable for archival use are presented. The properties of polyethylene and

polyethylene terephthalate films of interest in connection with their possible use for the protection of documents are

discussed. October 30, 1959. 20 p. Mono. 6. Properties of high-temperature ceramics and

cermets. Elasticity and density at room

temperature, S. M. Lang

In order to provide some of the basic data necessary for the effective utilization of ceramics and cermets in various high-temperature applications, a specimen "bank" of such

materials, mainly commercially fabricated, was established

for the measurement of physical properties and constants. This Monograph describes: (1) The materials and some of

their fabrication data; (2) bulk densities; (3) theoretical

densities; and (4) the dynamic room-temperature elastic constants. Data are given for 46 sets of specimens,

representing 20 different materials; these include oxides, carbides, borides, cermets, and an intermetallic compound. A statistical evaluation was used for analyzing the data. Results of the room-temperature measurements show

that: (1) Significant variations are common both in the specimens of one group and from group to group of speci- mens prepared of the same material; (2) the largest variations occur for specimens formed by hot-pressing, although

average values are higher for hot-pressed specimens; and

(3) measurements of the dynamic elastic constants by the

sonic method are more sensitive as indicators of homogeneity and group uniformity than bulk-density measurements. March 1, 1960. 45 p. Mono. 7. Precise measurement of heat of combustion with a bomb calorimeter, R. S. Jessup

This Monograph gives detailed descriptions of apparatus and methods which are used at the National Bureau

of Standards for precise determinations of heats of combustion of liquid hydrocarbon fuels. Numerical examples

are given of methods of calculating results of measure- ments from observed data. The technique of making and

filling glass bulbs to contain samples of volatile liquid

fuels is described. The accuracy of the methods described is about 0.1 percent. This is intermediate between the accuracy of

0.01 or 0.02 percent attained in certain measurements on

pure compounds, and the accuracy of several tenths of one

percent obtainable with published standard procedures

for measurements on fuels. February 26, 1960. 23 p. Mono. 8. Mercury barometers and manometers, W. G. Brombacher, D. P. Johnson, and J. L. Cross The various designs of mercury barometers and manometers are briefly described, with a more extended discussion

of the various design elements which may affect the achievable accuracy. Sources of error in measuring pressures

are described in considerable detail, particularly for portaable instruments, including scale, temperature, gravity,

capillarity, vacuum errors and return gas column. Methods of minimizing those errors and of making the corrections, including extensive tables, are presented. Standard

conditions are defined and the pertinent properties of mercury given. The paper contains 65 literature refer- ences. May 20, 1960. 59 p. Mono. 9. A method for the dynamic determination of the elastic, dielectric, and piezoelectric constants of quartz, S. A. Basri Several dynamic determinations have been made of the constants of quartz. Most of these determinations do

not take into account the piezoelectric effect; those that

do, suffer from certain deficiencies which are discussed in this paper. Taking into account the piezoelectric effect, expressions

for the frequency of longitudinal vibration of rectangular

bars and thickness shear vibration of infinite plates are derived and applied to the determination of the constants

of quartz. On the basis of present theoretical knowledge,

it is suggested that the best procedure is to measure the frequency of vibration of 2 particular cuts for rectangular

bars, and 7 cuts for plates, and to measure the capacitance

at zero frequency of a rectangular bar. These 10 measure- ments provide the data for determining the 6 elastic, 2

dielectric, and 2 piezoelectric constants of quartz uniquely. For accurate measurements, it will first be necessary to determine the linear coefficients of expansion of quartz to higher accuracy than is available at present. June 1, I960. 22 p. Mono. 10. The "1958 He4 scale of temperatures". Part

1. Introduction, F. G. Brickwedde and Part

2. Tables for the 1958 temperature scale, H. van Dijk, M. Durieux, J. R. Clement, and J. K. Logan The generally used practical scale of temperatures be- tween 1° and 5.2° K is the He4 vapor pressure scale based on an accepted vapor pressure equation or table. In Sevres (near Paris), October 1958, the International Committee on Weights and Measures recommended for inter- national use the "1958 He4 Scale" based on a vapor

pressure table arrived at through international cooperation and ageement. This table resulted from a consideration

of all reliable He4 vapor pressure data obtained using gas themometers, and paramagnetic susceptibility and carbon

resistor thermometers The theoretical vapor pressure equation from statistical thermodynamics was used with thermodynamic data on liquid He4 and the vapor equation

of state to insure satisfactory agreement of the vapor

pressure table with reliable thermodynamic data. (Reprinted from the Journal of Research of the NBS—A, Physics and Chemistry, Vol. 64A, No. 1, January-February 1960). June 17, i960. 17 p. Mono. 11. Conductive flooring for hospital operating rooms, T. H. Boone, F. L. Hermach, E. H. MacArthur, and R. C. McAuliff

Characteristics and performance of available types of conductive flooring materials were investigated in the 60
laboratory. The study showed that the electrodes and

instruments used to measure the floor greatly affected the measured resistance, but that the method specified by the National Fire Protection Association for measuring the

electrical resistance reasonably simulated the conditions under which a floor functions in reducing electrostatic hazards. The physical, chemical and serviceability

characteristics of conductive floorings investigated showed

results comparable with those of nonconductive flooring

of the same type. Consequently, with some limitations, an architect may base his choice of a conductive flooring material on his knowledge of the behavior of similar nonconductive materials. (Reprinted from the Journal of Research of the NBS—C, Engineering and Instrumentation, Vol. 63C, No. 2, October-December 1959). March

21, 1960. 16 p. Mono. 12. Stabilization of free radicals at low temperatures This volume is the final report of the National Bureau

of Standards Free Radicals Research Program. The

three-year program which ran from September 1956 to October 1959 was devoted to the study of the properties

of reactive molecular fragments trapped in inert matrices

at low temperatures. The first paper describes the or- ganization and operations of the Free Radicals Research

Program. The next seven papers summarize the technical accomplishments of the NBS Program, as viewed

against the status of the entire field of radical trapping. The ninth paper is a summary of the Fourth International Symposium on Free Radical Stabilization which was held

in Washington, D.C., August 31 through September 2, 1959. The final paper is a complete cross-referenced bibliography of papers published as a result of the research completed during the three-year period of the Program.

August 1, 1960. 110 p. Mono. 13. Mechanical properties of structural materials

at low temperatures, a compilation from

the literature, R. M. McClintock and H. P. Gibbons The tensile strength, yield strength, tensile elongation, and impact energy of about two hundred materials,

metallic and nonmetallic, are given graphically as functions of temperature between 4° and 300° Kelvin. June

1, 1960. 180 p. Mono. 14. Bibliography on molecular and crystal struc- ture models, D. K. Smith A bibliography on molecular and crystal structure models is presented. The references are classified into those discussing models in general, static models, dynamic

models, or construction devices. The static models are further classified in molecular (Fisher-Hirschfelder-Taylor

type), closed packing, open molecular, open crystal structure, open with parallel rods, polyhedral, and miscellaneous

models. A short annotation is given which describes the model types and indicates the more significant articles pertaining to them. May 20, 1960. 7 p. Mono. 15. Calibration of line standards of length and

measuring tapes at the National Bureau of Standards, L. V. Judson The methods used at the National Bureau of Standards

in calibrating line standards of length and measuring

tapes submitted for standardization are outlined. The

equipment used is described briefly. There is a discussion of some considerations that should be given as to whether or not a standard should be submitted to the

Bureau. Instructions are given for submitting items to the Bureau for calibration. The appendix contains useful information on the use of steel tapes. May 20, 1960. 11 p. (Supersedes C572).

Mono. 16. Vibration-rotation structure in absorption bands for the calibration of spectrometers from 2 to 16 microns, E. K. Plvler, A. Danti,

L. R. Blaine, and E. D. Tidwell

Suitable bands of common gases have been tabulated and remeasured wherever necessary from 2 to 16 microns

to obtain an accuracy of about 0.03 em-1 throughout the

region and to provide good calibrating points at frequent

intervals. Some 600 rotation-vibration lines are illus- trated in 20 spectrograms and wavenumbers are listed in companion tables with considerable intercomparison with worthy data obtained in other laboratories. The absorption bands were remeasured or calibrated by using either a precisely graduated grating circle or standard atomic

lines with the fringe system formed by a Fabry-Perot

interferometer. Characteristic features of the individual bands are discussed briefly and references to other publications are given. The substances used for calibration in- clude H2 0, C02 , CO, HC1, HBr, NH3 , C2 H2 , CH4 , N2 0, and polystyrene film. (Reprinted from the Journal of Research of the NBS—A, Physics and Chemistry, Vol. 64A, No. 1, January-February 1960.) June 21, 1960. 20 p. Mono. 17. New description of thorium spectra, R. Zalubas Wavelengths and estimated intensities in electrodeless lamp and spark sources are presented for 15121 lines of Th i, Th ii, Th in, and Th iv in the spectral range from

2000 to 11550 A. Previously published interferometric values are in this table rounded off to three decimal places and followed by the letter i. June 21, 1960. 103 p.

3.8. HANDBOOKS

These are recommended codes of engineering and industrial practice, including safety codes, developed in cooperation with the national organizations and others concerned. In many cases the recommended requirements are given official status through their incorporation in local ordinances by

State and municipal regulatory bodies. See

"Price List of Available Publications," page 161. H28 (1957)—Part II. Screw-thread standards for Federal

services, 1957. Amends in part H28

(1944) (and in part its 1950 Supplement).

Part II includes standards for pipe threads, Dryseal

pipe threads, hose coupling and fire hose coupling threads, gas cylinder valve outlet, inlet, and safety device threads, and hose connections for welding and cutting equipment.

Parts I and II supersede all of Handbook H28 (1944) and

the 1950 Supplement thereto excepting sections IX and X

and appendix 5. November 16, 1959. 119 p. H63. Protection against neutron radiation up to 30 million electron volts Information for protection of personnel working near

reactors, accelerators and radioactive neutron sources is included in this report. The physical problems of measuring neutron radiation and absorbed neutron dose are dis- cussed as well as the current status of information on the

biological effects of neutrons. Rules are recommended for safe operation of neutron sources and for protection of personnel. The recommendations of this Handbook take

into consideration the January 8, 1957, statement of the National Committee on Radiation Protection and Measure- ment lowering the maximum permissible levels for radiation workers. November 22, 1957. 88 p. 61
H64. Design of free-air ionization chambers, H. 0. Wyckoff and F. H. Attix The material in this Handbook is a collection of the data required for designing free-air ionization chambers. These chambers are principally used for the calibration of the smaller clinical and field instruments. Until recently, they were used in a few of the large national standards

laboratories; with the increase in radiation therapy, more

of the national laboratories and many industries have become interested in providing such calibration facilities. The handbook contains information for the design of primary standards to measure radiation in roentgens from

the majority of the sources now used in medical radiology. For a given design, it also includes data on the magnitude

of the corrections required to obtain a determination of the number of roentgens in 50 to 500 kv X-ray beams from the

ionization measurements. Sample computations and an

estimate of the possible errors in such determinations are

included. Some of this data is based on information

obtained during intercomparisons of the free-air chambers

of the national standards laboratories of various countries. December 13, 1957. 16 p. H65. Safe handling of bodies containing radioactive

isotopes (A guide for surgeons, pathologists, and

funeral directors) This is one of a series of reports prepared by the National Committee on Radiation Protection and Measurements. The present Handbook is a revision of Handbook

56, Safe Handling of Cadavers Containing Radioactive

Isotopes. This revision was prepared in order to include information on additional isotopes used in therapy and

encountered in the handling of bodies, and to conform

with the lowered maximum permissible radiation levels recently recommended both nationally and internationally. July 10, 1958. 20 p. (Supersedes H56). H66. Safe design and use of industrial beta-ray sources This Handbook was prepared to serve as a guide toward

the safe design, manufacture, installation, use, maintenance, and disposal of beta-ray sealed sources for industrial applications. In addition, it may be of some help to the

reader in complying with the radiation protection regulations issued by the U.S. Atomic Energy Commission and

other Federal and State agencies. However, as these governmental regulations may be changed from time to time, they may differ in detail from the recommendations

that are given. The Handbook was prepared by Sub- committee 8 on Sealed Beta-Ray Sources of the ASA-Z54

Sectional Committee on Protection for the Industrial Use

of Radiation. May 28, 1958. 28 p. H67. Checking prepackaged commodities. A manual for weights and measures officials, M. W. Jensen A manual for State and local weights and measures

officials, describing a method for controlling various types

of prepackaged commodities. March 20, 1959. 27 p. H68. Tabulation of data on receiving tubes, C. P. Marsden, W. J. Keery, and J. K. Moffitt A tabulation of Receiving-Type Electron Tubes with some characteristics of each type has been prepared in the form of two major listings, a Numerical Listing in which

the tubes are arranged by type number, and a Characteristic

Listing in which the tubes are arranged by tube type and

further ordered on the basis of one or two important

parameters. The tabulation is accompanied by a listing of similar tube types and basing diagrams for the listed tubes. November 1, 1959. 110 p. H69. Maximum permissible body burdens and maximum

permissible concentrations of radionuclides in air and in water for occupational exposure

This Handbook represents a complete revision of Handbook 52, originally published in 1953. It was prepared

jointly by the NCRP and the ICRP. All of the material

in the earlier handbook was reviewed and revised in light of the basic changes in our permissible dose concepts intro- duced in January 1957 and April 1958. Maximum permissible body burdens and maximum permissible concentrations of radionuclides in air and in water are given for approximately 300 radionuclides as compared with about

100 in the original report. As a result of the review, some

of the values have been revised up or down and some have

remained the same as in the earlier report. The more

detailed discussion of some of the derivations and the bibliography have been published in the ICRP Committee

3 report on X-rays Up to 3 Mev and Alpha and Gamma

Rays From Sealed Sources, 1958 revision. (Pergamon

Press, New York, N.Y., April 1960). June 5, 1959. 95 p. (Supersedes H52). H71. Specifications for dry cells and batteries This seventh edition of American Standard Specifica- tion for Dry Cells and Batteries, American Standard C18,

includes new tests, up-to-date data, and covers new types

of dry cells. An alarm test with results on batteries suitable for alarm circuits is a new feature of this seventh

edition of the specification. Performance data on flash- light batteries, radio batteries, hearing-aid batteries, etc., have been brought up to date. Batteries for use with

transistors are included in this specification for the first time. December 29, 1959. 20 p. (Supersedes C559).

3.9. MISCELLANEOUS PUBLICATIONS

As the name implies, this series includes material which, because of its character or because of its size, does not fit into any of the other regular publication series. Some of these are charts, administrative pamphlets, Annual Reports, Weights and Measures Conference Reports, and

other subjects appropriate to the Miscellaneous

series. See "Price List of Available Publications", page 161. M221. Hydraulic research in the United States, 1957, H. K. Middleton

Research and development projects being conducted in 1957 in hydraulic and hydrologic laboratories of universities and Federal agencies throughout the United States and Canada are briefly described. A list of the contri- buting laboratories is given. The status of continuing

projects covered by previous issues of the publication is reported upon, as well as on new projects in progress, the

results of completed work are given. References to publications relating to the projects and an extensive subject index are included. July 24, 1957. 220 p. M222. Report of the 42d National Conference on

Weights and Measures, 1957 A report of the proceedings of the forty-second National Conference on Weights and Measures, held in Washington,

D.C., June 3, 4, 5, 6, and 7, 1957, and attended by state, county, and city weights and measures officials. 133 p. M223. Annual report 1957 National Bureau of Standards

This is a summarized illustrated report of the research and development activities of the Bureau in the fields of physics, chemistry, engineering, and mathematics,

during the fiscal year ending June 30, 1957. Brief accounts

are included relating to projects completed by or in progress

in the Bureau's scientific and technical divisions, including

electricity and electronics, optics and metrology, heat, atomic and radiation physics, chemistry, mechanics,

organic and fibrous materials, metallurgy, mineral products, building technology, applied mathematics, data processing systems, cryogenic engineering, radio propagation, radio standards, and basic instrumentation. 62
A statement of the Bureau's testing, calibration, and

Standard Samples activities by Divisions is also included,

as well as a review* of its technical services and cooperation, both national and international. 143 p. M224. Hydraulic research in the United States, 1958, 'H. K. Middleton

Research and development projects being conducted in 1958 in hydraulic and hydrologic laboratories of universities and Federal agencies throughout the United States and Canada are briefly described. A list of the contributing

laboratories is given. The status of continuing projects covered by previous issues of the publication is reported

upon, as well as on new projects in progress, the results of completed work are given. References to publications

relating to the projects and an extensive subject index are

included. August 15, 1958. 167 p. M225. Report of the 43d National Conference on Weights and Measures, 1958 A report of the proceedings of the forty-third National

Conference on Weights and Measures, held in Washington,

D.C., June 9, 10, 11, 12, and 13, 1958, and attended by

state, county, and city weights and measures officials. 146 p. M226. Research highlights of the National Bureau of Standards, Annual report 1958

This is a summarized illustrated report of the research and development activities of the Bureau in the fields of physics, chemistry, engineering, and mathematics, during

the fiscal year ending June 30, 1958. Brief accounts are included relating to projects completed by or in progress in the Bureau's scientific and technical divisions, including

electricity and electronics, optics and metrology, heat, atomic and radiation physics, chemistry, mechanics,

organic and fibrous materials, metallurgy, mineral projects, building technology, applied mathematics, data processing

systems, cryogenic engineering, radio propagation, radio

standards, and basic instrumentation. A statement of the Bureau's testing, calibration, and

Standard Samples activities by Divisions is also included,

as well as a review of its technical services and cooperation, both national and international. 138 p. M227. Hydraulic research in the United States, 1959, H. K. Middleton

Research and development projects being conducted in 1959 in hydraulic and hydrologic laboratories of universities and Federal agencies throughout the United States and Canada are briefly described. A list of the contributing laboratories is given. The status of continuing

projects covered by previous issues of the publication is reported upon, as well as on new projects in progress, the

results of completed work is given. References to publications relating to the projects and an extensive subject index are included. October 1, 1959. 188 p. M228. Report of the 44th National Conference on Weights and Measures, 1959 A report of the proceedings of the forty-fourth National Conference on Weights and Measures, held in Washington,

D.C., June 8, 9, 10, 11, and 12, 1959, and attended by

state, county, and city weights and measures officials. 144 p. M229. Research highlights of the National Bureau of Standards, Annual report 1959

This is a summarized illustrated report of the research and development activities of the Bureau in the fields of physics, chemistry, engineering, and mathematics, during

the fiscal year ending June 30, 1959. Brief accounts are included relating to projects completed by or in progress

in the Bureau's scientific and technical divisions, including

electricity and electronics, optics and metrology, heat, atomic and radiation physics, chemistry, mechanics,

organic and fibrous materials, metallurgy, mineral products, building technology, applied mathematics, data processing systems, cryogenic engineering, radio propagation,

radio standards, and basic instrumentation. A statement of the Bureau's testing, calibration, and

Standard Samples activities by Division is also included,

as well as a review of its technical services and cooperation, both national and international. 169 p. 3.10. BUILDING MATERIALS AND STRUC- TURES REPORTS

This series reports the results of research in building technology work at the National Bureau

of Standards. The objective is to provide govern- ment, the interested professions, and the building industry with technical data useful in the preparation of building codes, standards, and engineering

design criteria. Subjects of primary interest are the properties of building materials, structures, equipment, and facilities. Effective July 1959,

this series was discontinued. Papers on building technology are now published in the Journal of Research (usually Section C. Engineering and

Instrumentation), or the Monograph series (page

59). See "Price List of Available Publications", page 161. BMS140, 3d ed. Building construction and maintenance,

E. R. Meggers

Selected references on building materials, equipment, good construction practices for new construction, and the modernization and maintenance of buildings. January

15, 1959. 30 p. BMS144, 2d Supplement. Sound insulation of wall, floor, and door constructions, R. V. Waterhouse,

R. D. Berendt, and R. K. Cook

Sound insulation data are presented for building struc- tures measured at the National Bureau of Standards in the period July 1955 to December 1956. These figures constitute the second supplement to the data published in Building Materials and Structures Report 144. The

accuracy of the figures is discussed. Details are also given

of a new average figure, called the Energy Average, for the

over-all sound insulation of a panel, and why it is prefer- able to the Decibel Average, which it is designed to supersede. December 1, 1958. 13 p. BMS151. Thermal resistance of airspaces and fibrous insulations bounded by reflective surfaces, H. E. Robinson, L. A. Cosgrove, and F. J. Powell Observed insulating values are presented for 28 test panels, of which 23 were insulated with reflective membranes used alone or in combination with fibrous insulations. The panels were tested at five different orientations corresponding to use as walls, ceilings, or floors. The

observed insulating values of panels are compared with

calculated values based on a method and data developed

in previous work at the National Bureau of Standards, and summarized in an appendix to this report. Observed

values for panels agreed within 10 percent, in most cases, with calculated values. Departures of observed from

calculated values are attributed to such factors as nonuniformity of airspace thickness, moisture condensation on

reflective surfaces, air circulation between tandem air- spaces, and effects due to local high conductance at edges

of insulations or radiation from framing members. November 14, 1957. 22 p. 63
BMS152. Wind pressures in various areas of the United

States, G. N. Brekke A procedure is described for developing a wind-pressure map that shows minimum resultant wind pressures (30

feet above ground) for design purposes throughout the

continental United States. This map was used in the 1955 revision of the American Standards Association's standard A58.1, American Standard Building Code Requirements for Minimum Design Loads in Buildings and

Other [Structures. It is based on records of annual fastest- single-mile wind speeds at 155 U. S. Weather Bureau

stations. In computing resultant wind pressures from

these data, allowance was made for gusts and for building

shape. Values for 15 of the stations were also adjusted

for altitude or for unusual local wind conditions. A table

of design wind pressures at various heights from less than

30 to more than 1,200 feet above ground is derived for use with the map. The principal sources of strong winds

affecting building constructions are briefly reviewed.

April 24, 1959. 8 p. 3.11 APPLIED MATHEMATICS SERIES

The Applied Mathematics Series contains mathematical tables, manuals and studies of special

interest to physicists, engineers, chemists, biologists, mathematicians, computers and others en- gaged in scientific and technical work. Some of the volumes are reissues, to meet a continuing demand, of the Mathematical Tables prepared by

the Project for the Computation of Mathematical

Tables conducted by the Federal Works Agency, Work Projects Administration for the City of New York, under the scientific sponsorship of and made available through the National Bureau of Standards. The Mathematical Tables series (MT)

as originally issued is out of print; the list, by

title, is given in NBS Circular 460. When the Applied Mathematics Division was

established at the National Bureau of Standards

in July 1947, the Mathematical Tables Project became identified with the unit of this Division known as the Computation Laboratory. See

"Price List of Available Publications", page 161. AMS49. Further contributions to the solution of simul- taneous linear equations and the determination

of eigenvalues Three related but independently presented papers

describe some recently developed techniques for the

solution of certain problems of numerical analysis: Kernel

polynomials in linear algebra and their numerical applications, by E. L. Stiefel; The quotient-difference algorithm, by P. Henrici; Solution of eigenvalue problems with

LR-transformation, by H. Rutishauser. The techniques developed are useful in solving simultaneous linear equations, in finding the eigenvalues of a matrix, in the construction of orthogonal polynomials, in the factorization

of polynomials, in expanding into continued fractional functions defined by power series of Laplace integrals, and in many other problems. January 15, 1958. 81 p. AMS50. Tables of the bivariate normal distribution function and related functions This volume is a compilation and extension of various

tables of Karl Pearson, Evelyn Fix, Jerzy Neyman and

H. H. Germond relating to the bivariate normal frequency

function g(x, y, z) = (l/2rjl-r*) exp[~i(x* +y

2 -2rxy) / (l-i*)]. Table I gives values of L(h,k,r)= (""^f"

g{x,y,r)dy for A,fc = 0(.l)4, r = 0(.05)0.95(.01)l, 6D. Table

II gives values of L{h,k, — r) for h,k =0(.l)u„ where w„<4

and L<y2 .10- 7

, r = 0(.05) .95(.01)1, 7D. The major portion of tables I and II have been compiled from Karl

Pearson's "Tables for Statisticians and Biometricians," Part

II. Table III tabulates V(h,\h) =j*dx£*z(x) z{y)dy where

3(*J = (l/2sr) exp(-^2

) for \=0.1(.l)l,°/i = 0(.01)4(.02)4.6

(.1)5.6, oo, 7D. Table IV gives V(\h,h) for X = 0.1(.l)l,

ft = 0(.0l)4(.02) 5.6,°o, 7D. Finally table V gives values

of (l^TOsin-^ for r = 0(.01)l, 8D. The Introduction is composed of two main parts, one dealing with the statis- tical applications of these tables, the other relating to in- terpolation and the computation of the tables. June 15, 1959. 258 p. AMS51. Tables of the exponential integral for complex arguments The function, Ei(z)=J {e~u/u)du, z =x + iy, is tabulated to six decimal places, for 0<x<4, 0<i/<10,

with intervals between the arguments so chosen that quadratic interpolation will yield the fullest attainable accuracy over most of the region. Also tabulated is Ei(z)

to ten decimal places over the region 0<—x, y<3.1 at intervals of 0.1. To facilitate interpolation the function

Ei(z) +log„z is tabulated for 0<x, y <1 to six decimal

places and for 0 < —x, y<lto ten decimal places. For the region 4<x<10, 0<?/<10 the auxiliary function e

xEi(z)

is tabulated to six decimal places since interpolation for the same number of significant figures is easier for this function than for Ex {z). Finally, a short table of e'Ei(z) over the region 0<+x, y <20 is given to six decimal

places over varying intervals. May 15, 1958. 634 p. AMS52. Integrals of airy functions Part I gives tables of integrals of the Airy function f(x)=^Ai(-t)dt; F(x)=f

Zf(t)dt where

1 fx < 3 Ai(x) =-

J

cos 2+xt dt with second central differences for x= — 2(.01)5 to 8 decimal

places and 7 decimal places, respectively. Part 2 gives tables of the modified Airy integral 40 (x)=Jo

°° e-*t-um)dt and its derivative A'0 (x) with second central differences

for x = 0(.01)l(.02)5(.05 )ll, l/x=.01(.01).l, to 8 decimal

places. In addition, a skeleton table is given of G(x) = ^A0 (t)dt for x=.5, 1(1)11, to 8 decimal places. May

15, 1958. 28 p. AMS53. Table of natural logarithms for arguments between five and ten to sixteen decimal places The table gives 16-place values of the natural (to the

bases) logarithms of the decimal numbers from 5 to 10 at intervals of 0.0001. This volume is a companion volume

to AMS31. The table was originally issued in the MT

series as volume IV in a four-volume table of natural logarithms MT12. March 28, 1958. 506 p. (Supersedes MT12). AMS54. Fractional factorial experiment designs for factors at three levels, W. S. Connor and M. Zelen This publication contains a collection of fractional

factorial designs of the series (l/3")x3 n for p=l, 2, 3, 4, 5, and for n ranging from 4 to 10 factors. The experiment 64
plans are constructed so that the treatment combinations

are grouped into blocks, thus allowing the experimenter

to take advantage of any homogenous grouping of the experimental material. May 1, 1959. 37 p. AMS56. Tables of osculatorv interpolation coefficients, H. E. Salzer The tables give the coefficients and Bi(p) where LTJ

f(x0 + ph)= 2 [A i (p)fi + Bi (p)hf'i \ [<-¥]

for «=2(1)5 and p = —

j^"~2~J

(1-0) exac* values or nine decimal places. These coefficients facilitate interpolation when both a function and its first derivative are tabulated. May 8, 1959. 25 p. AMS57. Basic theorems in matrix theory, M. Marcus

This publication is a survey of the basic identities and

inequalities of matrix theory, and is intended as a handy

reference for research workers and students. Included are

results dealing with elementary properties, canonical forms,

invariance, congruence, commutativity, orthogonalization,

eigenvalues, determinants, sub-matrices, rank, determi- nant and rank inequalities, numerical methods for inversion and eigenvalues, and condition numbers. No attempt has been made to provide proofs for the theorems listed; and

all statements are made directly in terms of matrices rather than linear transformations. References are given after each result, unless the result is found in most textbooks on

matrices. January 22, 1960. 27 p. TECHNICAL NOTE SERIES

This series was initiated in 1959 to supplement

the Bureau's regular publications program. Technical Notes provide a means for making available

scientific data that are of transient or limited

interest. They are available for sale by the Office

of Technical Services, U.S. Department of Commerce, Washington 25. D.C. (Order by PB number only). See "Price List of Available Publications", page 161. TNI (PB151360). A double-pulse total-absorption fast neutron spectrometer, L. J. Nicastro and R. S. Caswell A fast neutron spectrometer utilizing the double-pulse

total-absorption technique has been developed for use in the energy range 1-20 Mev. The total absorption spec- trometer uses a hydrogenous scintillator, in which a fast neutron may lose all its energy, together with a detector

for slow neutrons. Scintillation detection of the disinte- gration caused by absorption of a slow neutron in an ele- ment of high reaction cross section serves to identify those neutrons which lost essentially all their energy in the hydrogenous scintillator. Various organic liquid scintillators loaded with natural methyl borate, and a plastic scintillator with a boron-10

or lithium-6 slow neutron scintillation detector nearby

were all tested with monoenergetic neutrons obtained from

the D(d,n) He3 and T(d,n) He4 reactions. The best ex- perimental results were obtained with a plastic scintillator and a Li8 I(Eu) crystal. Representative data for this spectrometer are presented. For comparison purposes,

the results of Monte Carlo calculations, made by Leiss for a phenylcylohexane liquid scintillator loaded with methyl

borate (B'° enriched), are also included. April 24, 1959. 25 p.

TN2 (PB151361). World maps of F2 critical frequencies and maximum usable frequency

factors, D. H. Zacharisen This publication reports six months of contour maps

and charts for use in predicting F2-layer maximum usable

frequencies. Prediction maps for each even hour of Greenwich Mean Time and charts in which time is con- tinuous along the abscissa are given for the months of January, March, June, July, September and December. The four parameters used for predicting MUFs are foF2 and the 4000 km MUF factor for a twelve-month

running average Zurich sunspot number of 50, and the

rates of change of foF2 and 4000 km MUF factor with

sunspot number. The first three parameters use a map

presentation with GMT constant over the surface of the map. The fourth parameter uses a chart presentation in which the ordinate is geomagnetic latitude and the abscissa

is local time. April 1959. 244 p. TN3 (PB151362). Detwinning quartz crystals, F. P. Phelps Attempts were made to detwin quartz by cooling through

the inversion temperature while a d.c. potential was applied and later with RF potential across the plate. BT, AT and X cut plates were used. Air was largely removed

to improve the insulation but this was not wholly satis- factory because of the difficulty of adequately degassing

the sample. Some samples yielded untwinned plates, others did not. It appeared that different samples of quartz behaved differently in respect to ease of changing

the twin pattern. The method used did not appear commercially useful because of the erratic behavior of different pieces of quartz. April 1959. 5 p. TN4 (PB 151 363). The vapor pressures of some hydrocarbons in the liquid and solid state

at low temperatures, W. T. Ziegler This paper presents a brief review of the literature per- taining to the vapor pressure of 11 hydrocarbons at low temperatures. These hydrocarbons are methane,

ethane, propane, n-butane, isobutane (2-methyl propane),

n-pentane, ethylene, propylene, 1-butene, acetylene and

cyclopropane. All of these except cyclopropane are en- countered in the purification of hydrogen from refinery

sources. Vapor pressure data are given for most of these hydrocarbons over the pressure range 0.001 to 1,500 mm

Hg. These data have been used to estimate the triple- point pressures of the hydrocarbons where these pressures were not found in the literature. Some data for the vapor

pressures of solid methane, ethane, n-butane, ethylene, acetylene and cyclopropane are included. May 1959. 17 p. TN5 (PB151364). Tables of median hourly values of the

solar zenith angle (x) for 35 locations, R, E. McDuffie

This report consists of tables of hourly values of cosine x from sunrise to sunset for the 15th day of each month

appropriate to 35 vertical incidence ionospheric stations associated with the National Bureau of Standards. February 1959. 38 p. TN6 (PB151365). An analysis of propagation measure- ments made at 418 Mc well beyond

the radio horizon, H. B. Janes, J. C. Stroud, and M. T. Decker

This report presents the result of an analysis of trans- mission loss measurements made at 418 Mc over the 134- mile path from Cedar Rapids, Iowa to Quincy, 111., during 1952 and 1953. The data consisted chiefly of con- tinuous simultaneous recordings of signal level at several receiving antenna heights, ranging from 30 to 665 feet above ground. These data are reduced to tabulations of hourly median values of basic transmission loss and fading 65
range. These values, as well as the hourly difference in transmission loss observed at two heights (height-gain) are

also shown plotted in scatter diagrams versus time of day

for each of the 13 two-week recording periods. The

medians for each recording period of all hourly values of median basic transmission loss, fading range and height- gain are plotted versus time of year to show any seasonal

variation in these statistics. A formula developed at NBS for predicting the median basic transmission loss in tropospheric scatter propagation is shown to be in good

agreement with the data. The results of a study of the

correlation of short-term signal variations observed at horizontally and vertically spaced antennas are given. May 1959/ 84 p. TN7 (PB151366). Low- and very low-radiofrequency tables of ground wave parameters for the spherical earth theory: the roots

of Riccati's differential equation,

J. R. Johler, L. C. Walters, C. M.

Lilley The roots of Riccati's differential equation are tabulated in detail throughout the low- and very low-radio- frequency part of the spectrum. The zeroes and certain other parameters used in the calculation of the amplitude and phase of the ground wave by the rigorous series of residues are also tabulated. February 1, 1959. 86 p. (Supplementary numerical data for C573). TN8 (PB151367). Thermodynamic properties of helium

at low temperatures and high pressures, D. B. Mann and R. B. Stewart The most comprehensive investigations of the thermo- dynamic properties of normal helium I and II were published over a period of the last 30 years by W. H. Keesom. A culmination of most of this work was published by Keesom in 1942. Since that time, numerous investigators have found several discrepancies in this original work

in the temperature range below 20° K. Recent interest

in the compressed liquid region, an area not covered ex- tensively by Keesom's work has resulted in new experi- mental data. These investigations and corrections to Keesom's work have been published, not as additions to the original Keesom work, but as separate and sometimes

isolated articles of very narrow interest and not in readily usable form. Also the new data have little value until

their relation to existing data is established. Methods of property diagram construction are also ex- plained, and the results are presented in the form of temperature-entropy and enthalpy-entropy diagrams. Pressures to 100 atmospheres, temperatures from 0° K to 20° K and specific volumes from 5 liters/ kgm. to 800 liters/ kgm. are presented. May 1959. 39 p. TN9 (PB151368). Frequency dependence of VHF iono- spheric scattering, J. C. Blair Results of frequency dependence measurements in VHF

scatter propagation are given. Data included were taken from continuous recordings of transmissions over the 1300 Km path from Long Branch, Illinois to Boulder, Colorado. Frequencies of 30, 40, 50, 74 and 108 Mc/s were recorded

simultaneously. Data were included for the period September 1957 to June 30, 1958. One principal result is that over the full range of fre- quencies observed, received power closely follows the

exponential relationship Pr aj^- The value of n varied

diurnally from 5 to 8, expressed for constant-aperture re- ceiving antenna. Among other results reported are the relationship of short-term signal amplitude distributions to relative in- fluence o

? meteoric activity as well as the fading rates observed, and the effect on the signal of SID's. The results presented herein are presented prior to completion of actual calibrating measurements on the antenna

systems and are subject to some review after such measure- ments are made. April 1959. 52 p.

TN10 (PB151369). Calculated behavior of a fast neutron

spectrometer based on the total absorption principle, J. E. Leiss Performance calculations for a total absorption fast neutron spectrometer are presented. The spectrometer

detecting element is a boron-10-loaded liquid scintillator. By making the scintillator a thin disk, only those neutrons whose first collision is a large-energy-loss hydrogen collision have appreciable chance of remaining in the spectrometer

long enough to be captured. The expected energy resolu- tion and efficiency of this type of spectrometer are de- termined, and are comparable to other types of fast neutron spectrometers. April 14, 1959. 36 p. TN11 (PB151370). Penetration of gamma rays from iso- tropic sources through aluminum

and concrete, M. J. Berger and

L. V. Spencer

Semi-analytical expressions, with numerically specified parameters, are given which represent the gamma ray dose

distribution in infinite aluminum or concrete media, for sources that are monoenergetic (with energies between

10.22 Mev and 0.0341 Mev), isotropic, and have the form

of an infinite plane, point, disk or spherical surface. May

11, 1959. 13 p. TN12 (PB151371). Transmission loss in radio propagation: II, K. A. Norton

In an earlier report with this title the concept of trans- mission loss was defined and its advantages explained. In this report a survey will be made of the transmission

losses expected for a wide range of conditions, i.e., for dis- tances from 10 to 10,000 statute miles; for radio frequencies from 10 kc to 100,000 Mc; for vertical or horizontal polari- zation; for ground waves, ionospheric waves, and tropospheric waves; over sea water or over land which may be

either jough or smooth; and for various geographical and

climatological regions. June 1959. 151 p. TN13 (PB151372). Technical considerations leading to an optimum allocation of radio fre- quencies in the band 25 to 60 MC,

K. A. Norton The object of this study is to outline very briefly the

technical considerations leading to an optimum allocation

of radio frequencies in the band 25 to 60 Mc. This report

will indicate what technical information is now available and where it may be obtained, as well as what additional information should be obtained in the future. June 1959. 96 p. TN14 (PB151373). Analysis of ionospheric vertical soundings for electron density profile data.

I. Facilities for convenient manual

reduction of ionograms, J. W.

Wright and R. B. Norton

Facilities for manual reduction of ionospheric vertical soundings to true heights are prepared using the "10

point" ratios of Ventrice and Schmerling. A study of the

effects of the earth's magnetic field on true height calcula- tions permits selection of five sets of these ratios assuring equal accuracy of application for any part of the world. The facilities available are in the form of transparent overlays and matching special graph paper. July 1959. 13 p. TN15 (PB151374). Prediction of the cumulative distri- bution with time of ground wave

and tropospheric wave transmission

loss. Part I—The prediction for- mula, P. L. Rice, A. G. Longley, and K. A. Norton

This report describes a method for predicting the cumulative distribution with time of transmission loss at fre- 66
quencies above 10 megacycles per second over paths of arbitrary length. The method makes use of available information about terrain profiles and surface meteorological data, and is based on the CRPL radio standard

atmospheres, in which the radio refractive index decreases

linearly with height for the first kilometer above ground, and then decreases exponentially with height. Discussion of the theoretical basis for this formula and a demonstration of its accuracy by comparison with ex- perimental data are reserved for later parts of this report. July 1959. 81 p. TN16 (PB151375). Some applications of statistical sampling methods to outgoing letter mail characteristics, N. C. Severo,

A. E. Newman, S. M. Young, and M. Zelen This paper presents applications of statistical sampling

procedures especially devised to procure information about

the characteristics of outgoing letter mail. The results of four separate studies carried out in the Washington, D.C., San Francisco, and Los Angeles post offices are herein summarized. The techniques used in the various studies were developed so that the required information would be

of predetermined reliability and could be gathered without

the use of a large staff and without interrupting the flow

of mail. The four studies presented concern: (1) letter

size and color characteristics, (2) ratio of hand canceled

mail to machine canceled mail, (3) top and bottom clear- ance space of an addressed envelope, (4) proportions of long and short letters. July 1959. 129 p. TN17. (PB 15 1376). Canceled. TN18 (PB151377). Radio noise data for the International Geophysical Year July 1, 1957- December 31, 1958, W. Q. Crichlow,

C. A. Samson, R. T. Disney, and M. A. Jenkins Radio noise data were obtained during the IGY from

fifteen stations in a world-wide network equipped with the ARN-2 noise recorder developed by the National Bureau

of Standards. Tables are presented which give the median

values of recorded noise for each month at all hours of the

dav, and also the seasonal average of the noise bv four-hour time blocks. July 27, 1959. 235 p. TN18-2 (PB151377-2). Quarterly radio noise dataMarch, April, May 1959, W. Q. Crichlow, C. A. Samson, R. T. Disney, and M. A. Jenkins Radio noise power, voltage, and logarithm of the voltage

are being recorded at a network of field stations throughout

the world. The data recorded at these locations during

the season March, April, May 1959 are presented. The

tabulation shows month-hour median and decile values of the power and the median values of the other two parameters as deviations below the power. The month-hour

median values for all three parameters are averaged over

a three-month, four-hour period to give seasonal time-block

values corresponding to the time-block values presented in CCIR Report No. 65. March 14, 1960. 61 p. TN19 (PB151378). Analysis of ionospheric vertical soundings for electron density profile data.

II. Extrapolation of observed elec- tron density profiles above hmaIF2,

J. W. Wright A tentative model of the F region above hmai is provided

to permit extrapolation of electron density profiles into

this region. The model corresponds to a simple "Chap- man" curve, and may be fitted to true height data (ob- tained in part I) by a simple graphical process. June

1959. 8 p.

TN20 (PB151379J. A preliminary analysis of amplitude

scintillations of radio stars observed

at Boulder, Colorado, R. S. Lawrence and J. L. Jespersen

Variations in the apparent flux from the radio source Cygnus-A are recorded at 53 and 108 me/s using a twoelement phase-sweeping interferometer located at Boulder. An ionospheric sounder operating at Ellsworth, Nebraska,

provides simultaneous vertical-incidence measurements of the ionosphere along the path. Amplitude scintillations observed at Boulder over a six-month period are compared

with the ionograms taken at Ellsworth. Positive correla- tion is found between amplitude scintillations and spread

F, while a small negative correlation is found with sporadic

E. The present result appears to be significant but a full year's data are being accumulated to disclose seasonal or diurnal effects. Detailed analysis of the scintillations indicates that the probability distribution of the amplitude

can be represented by the Rice probability distribution

function. The scintillation rate for 108 mc/s seems to be more rapid than for 53 mc/s. July 1959. 19 p. TN21 (PB151380). Variations of gamma cassiopeiae, S. R. Pottasch The variations of gamma Cassiopeiae between 1890 and

1950 are summarized and discussed. The variations of visual magnitude, color temperature, radius and electron density of the shell, and the spectral variations are depicted. August 1959. 29 p. TN22 (PB 151381). Precise time synchronization of widely

separated clocks, A. H. Morgan

This paper describes known precise methods of setting a group of widely separated clocks to precisely the same

time and keeping them in close agreement indefinitely; most of the proposed methods are now available. An

estimate of the accuracies of each method are given. Also, there is some discussion of high frequency radio propagation theory pertinent to two of the methods and a few

sets of measurements of the propagation delay time of high frequency signals from WWV to WWVH are given. Several graphs and tables are included to simplify some of the calculations. July 1959. 65 p. TN23 (PB151382). Design of single frequency filters, F. F. Fulton, Jr. Efficient procedures are shown for designing filters formed by a number of identical resonant circuits loosely coupled together, and which are required to accept one narrow band of frequencies and reject another narrow band somewhat removed in frequency, without any special requirements on the shape of the attenuation curve in between these regions. The design is based on using a

large number of sections. August 20, 1959. 10 p. TN24 (PB151383). Radio wave propagation in an inhomogeneous atmosphere, J. R. Wait A self-contained treatment of the theory of radio waves

in an inhomogeneous atmosphere is given. The refractive index is assumed to vary with height above the earth in a monotonic fashion. Variation according to an exponential law is used for illustration of general principles. For this

case, rigorous series formulas are developed for the distance

to the horizon for an elevated point in the atmosphere. September 10, 1959. 20 p. TN25 (PB 151384). Communication theory aspects of television bandwidth conservation, W. C. Coombs New concepts of communication bandwidth utilization and conservation are in prospect through difference signal modulation systems in which only relative changes infor- mation is transmitted in lieu of absolute amplitudes. By

67
these systems, the changes data function is made one of time as well as of amplitude, so that better advantage

can be taken of redundancies in the video signal. Advantageous conversions of information rate are made

feasible by reason of a tremendous disparity, existing between the extremely high information capacity of con- ventional television systems and the relatively very low

perception capability of a human observer channel. In- formation conversions more consistent with perception

capabilities of the human channel are achieved in difference

signal modulation without usual great expansion of bandwidth that would be required to reproduce every possible absolute amplitude of each datum in the whole video

picture mosaic directly. Conversion to binary digital form accrues the further advantages of binary systems, including greater immunity

to noise, greater adaptability to discrete data storage media, greater ease of scrambling for security, and greater amenability of encoding to optimum parametric controls

for most advantageous transmission. August 1959. 26 p. TN26 (PB151385). Survey of Central Radio Propagation Laboratory research in tropospheric propagation 1948-1956, J. W.

Herbstreit and P. L. Rice

This report summarizes and abstracts publications con- cerned with the National Bureau of 'Standards tropospheric propagation research program dating back to the formation of the Central Radio Propagation Laboratory. Some technical papers are reproduced here as supplements

to this report and excerpts from some of the longer technical reports are also included. September 1959. 211 p. TN27 (PB151386). Distribution of mail by destination

at the San Francisco, Los Angeles, and Baltimore Post Offices, N. C. Severo and A. E. Newman

This report presents the results of the application of the sampling method presented in a paper by Norman

C. Severo and Arthur E. Newman entitled "A statistical chain-ratio method for estimating relative volumes of mail to given destinations", NBS Journal of Research 64C, No. 1, 37, January- March 1960. These studies were made at the San Francisco, Los Angeles, and Balti- more Post Offices. December 1959. 55 p. TN28 (PB151387). A history of vertical-incidence iono- sphere sounding at the National Bureau of Standards, S. C. Gladden

This is an attempt to treat in chronological order the development of vertical incidence ionosphere sounding at the National Bureau of Standards through 1957. Of

necessity many phases of the radio work of the Bureau

have been omitted or treated lightly as not being germane

to the principal purpose of this history. With the exception of early workers in the field, names of individuals

are to be found only in the references. Source material includes the monthly, quarterly, and

annual reports of Section 6, Division 1 (the old Radio

Section), and of the Central Radio Propagation Laboratory; reports of the Interservice Radio Propagation Laboratory; the declassified reports of the International Radio

Propagation Conference ; the National Bureau of Standards

Journal of Research; the NBS Technical News Bulletin; published and unpublished reports of NBS; periodical

literature, such as the Proceedings of the Institute of Radio Engineers, the Physical Review, Nature, Journal of Geophysical Research (formerly Terrestrial Magnetism

and Atmospheric Electricitv), and Science. September

1959. 134 p. TN29 (PB151388). Photographic dosimetry at total ex- posure levels below 20 mr, M.

Ehrlich and W. L. McLaughlin

Assemblies of commercial photographic material sand- wiched between two plastic scintillators can be used to measure high-energy X- or gamma-ray exposures down

to 1 mr and less. The energy dependence of the assemblies' response is much less than that of a conventional photographic dosimeter, in some instances allowing an

exposure interpretation with an accuracy of ±25 percent over the energy range from about 0.1 Mev to 1.25 Mev.

However, low-intensity reciprocity failure limits the range

of applicability of the "system. Conventional photographic dosimeters, not incorporating scintillators, are usually preferable for routine personnel

dosimetry. By extending the monitoring period, it may

be possible to avoid personnel dosimetry below 20 mr

entirely. However, by doing this, one introduces additional difficulties because of instabilities in the photographic image. In some instances, an increase in effective emulsion thickness, achieved by using stacks of identical

films, may lead to an increase in emulsion sensitivity

sufficient to extend the useful range of a film badge well below 20 mr, without the use of a scintillator. October

1959. 23 p. TN30 (PB151389). Aerodynamic phenomena in stellar atmospheres—A bibliography A bibliography and short abstract of papers appearing

in the astronomical literature between 1920 and 1960 on

the subject of aerodynamic phenomena in stellar atmospheres. Prepared collaboratively by P. Ledoux, Institut d'Astrophysique, Liege; B. E. J. Pagel, Royal Observatory, Herstmonceux ; J. Tuominen, University of Helsinki; C. Pecker, Institut d'Astrophysique, Paris; R. Lust, Max

Planck Institut, Munich; G. Righini and G. Kalamai,

Observatorio Astrofisico di Arcetri, Firenze; S. Miyamoto, Kwasan Observatory, Kyoto; S. A. Kaplan, University

of Lwow, and S. B. Pickelner, University of Moscow and

Simeis Observatory; C. A. Whitney, Smithsonian Astrophysical Observatory, Cambridge; and L. L. House and

R. N. Thomas, National Bureau of Standards, Boulder,

in an attempt to provide a working bibliography for the Fourth Symposium on Stellar Atmospheres, to be held during August 1960 at Varenna, Italy, under the sponsorship of the International Astronomical Union and Inter- national Union of Theoretical and Applied Mechanics. September 1959. 89 p. TN31 (PB151390). An atlas of oblique-incidence iono- grams, W. Agy, K. Davies, and

R. Salaman

This atlas is intended to serve a twofold purpose:

first, to provide a compilation of records, of a type be- coming standard in the field of ionospheric research, for those workers who are not now familiar with them, and

second, to present records which are characteristic of the

specific paths used by the National Bureau of Standards

for consideration bv those using other paths. November

1959. 135 p. TN32. (PB 15 1391). Canceled. TN33 (PB151392). Distribution of incoming lettermail at the Baltimore, Md. City Post

Office, B. M. Levin and A. E. Newman

Lettermail at the Baltimore, Md. post office was

sampled and studied for the purpose of estimating the dis- tribution characteristics of letters for local delivery. Separate studies were conducted for first- and third-class mail and the results are reported both separately and combined. The study demonstrated an effective method of sampling incoming lettermail. It also yielded data needed

for the. design of efficient procedures for sorting mail

using machinery now being developed. October 1959. 114p. TN34 (PB151393). Resistance diode bridge circuit for temperature control, L. H. Bennett and V. M. Johnson The conventional ac bridge gives irregular performance

including loss of temperature control when the temperature error exceeds a certain critical value. The present 68
note describes a simple method of achieving stable temperature control over a large range of temperatures. October 1959. 4 p. TN35 (PB151394). Service area of an airborne tele- vision station, M. T. Decker As a step in the evaluation of a proposed airborne tele- vision network, the service to be expected from an air- borne station has been calculated for a wide variety of operating conditions. The use of basic transmission loss to describe the radio propagation effects enables the

results to be used when equipment parameters are changed

as system requirements and economic considerations

dictate. October 1959. 43 p. TN36 (PB 151 395). A multiplet table of astrophysical

interest (Revised Edition). Part

I. Table of multiplets and Part II. Finding list of all lines in the table

of multiplets, C. E. Moore The leading lines in 143 atomic spectra of 85 chemical

elements are listed in related groups j called multiplets. For each spectrum the multiplets are arranged in order of decreasing wavelength. Estimated intensities, excitation

energies, and multiplet designations are given for the indi- vidual lines, and each multiplet is assigned a number. An

extensive bibliography covers the source material used for the compilation. The table is presented in two parts: Part I includes the multiplets, with the spectra of each

element being given in order of increasing ionization, and

the elements in order of increasing atomic number.

Part II is a Finding List in which all the lines in Part I are entered in order of increasing wavelength, with their multiplet numbers. The range of the Table is from 2951 A to 13164 A. A

supplementary table of "Forbidden Lines" extends from

2972 A to 12645 A. November 1959. 256 p. TN37 (PB 15 1396). Application of RF micropotentiometers

for calibration of signal generators

to 1000 Mc, L. F. Behrent With the RF Micropotentiometer, signal generator output voltage can be calibrated to 1000 Mc simply and

accurately if the procedures outlined in this paper are

carefully followed. The sources of error are discussed and

methods for minimizing or eliminating them are described. Topics discussed include: rf shielding, selection of a suitable

rf detector, impedance matching and the proper selection

of voltage reference planes. January 1960. 14 p. TN38 (PB151397). Design and construction of a liquid hydrogen temperature refrigera- tion system, D. B. Chelton, J. W.

Dean, and B. W. Birmingham

Maintaining a liquid hydrogen bubble chamber at 27° K

has been achieved with an automatically controlled closed

circuit hydrogen refrigeration system of 300 watts capacity. The system is sufficiently flexible to be used on

other experimental apparatus requiring refrigeration at

liquid hydrogen temperatures. Several control systems

are discussed. Experimental evidence is compared to predicted performance for design operating conditions. General design charts are developed that enable heat exchanger lengths and associated operating parameters

to be determined for the pertinent heat exchanger configuration when employed in liquid hydrogen refrigerators of other capacities. January 12, 1960. 37 p. TN39 (PB151398). Helium refrigeration and liquefaction using a liquid hydrogen refrig- erator for precooling, D. B. Chelton,

J. W. Dean, T. R. Strobridge, B. W.

Birmingham, and D. B. Mann

Consideration is given to the use of a hydrogen refrig- erator to assist in the production of temperatures below

those obtained with hydrogen. A hydrogen refrigerator

is used to maintain a precooling evaporator at or near

21° K in a helium gas circuit. The helium circuit may be arranged to produce liquid for external use or to pro- duce refrigeration between 21° K and 4.2° K in a closed system. Charts have been developed that show the require- ments of the composite helium-hydrogen system and the

effect of heat exchanger performance. The relative quantities of refrigeration (hydrogen and helium) at vari- ous temperature levels have been determined. January

27, 1960. 31 p. TN40-1 (PB151399-1). Mean electron density variations

of the quiet ionosphere, I

March 1959, J. W. Wright and

L. A. Fine The CRPL has initiated a program for large-scale computation of electron density profiles from ionospheric

vertical soundings. Scaling is performed at field stations permitting computation of hourly profiles at the central laboratory. These profiles are combined to form hourly mean quiet profiles for each station and month. The

results of this program for one month are illustrated graphically. This report is the first of a series illustrating the electron density variations in the mean quiet ionosphere between latitudes 15° N and 50° N along the 75° W

meridian. February 1960. 50 p. TN40-2 (PB151399-2). Mean electron density variations

of the quiet inosphere, 2

April 1959, J. W. Wright and

L. A. Fine The CRPL has initiated a program for large-scale computation of electron density profiles from ionospheric

vertical soundings. Scaling is performed at field stations permitting computation of hourly profiles at the central laboratory. These profiles are combined to form hourly mean quiet profiles for each station and month. The

results of this program for the month of April are illustrated graphically. This report is the second of a series illustrat- ing the electron density variations in the mean quiet ionosphere between latitudes 15° N and 50° N along the

75° W meridian. February 1960. 50 p. TN41 (PB151400). Expendable modules as bases for disposal-at-failure maintenance, R.

O. Stone, P. Meissner, and K. M.

Schwarz The maintenance of future electronic equipment will more than likely exceed the capabilities of existing mainte- nance activities if present maintenance procedures are continued. Design trends such as miniaturization, printed

circuitry, encapsulation, and modular construction all point toward disposal-at-failure maintenance. Disposalat-failure modular design would help to solve some of the future maintenance problems and would also be compatible with future design trends.

It has been suspected that disposal-at-failure mainte- nance would be too costly to be practical. This report compares the costs to procure, support and maintain an equipment designed with expendable modules to the costs to procure, support, and maintain a similar equipment

designed with repairable modules. It was found that the

total costs in either case were approximately equal. Since

the cost factor is not important in the decision between

expendable assembly or repairable assembly maintenance,

other factors, such as improved reliability of equipment,

smaller size, lighter weight, and improved maintenance,

all advantages that may be gained through the use of expendable design, should be carefully studied. These

advantages may be so important as to completely deter- mine a decision in favor of expendability. Modules of various electrical sizes (from 1 to 12 tubes) have been compared from the standpoint of total over-all procurement cost, in order to determine an optimum

69
module size. On the basis of calculations made, it has been concluded that the optimum module which would

lead to lowest over-all procurement cost and at the same

time be of aid in the solution of logistic and maintenance

problems would be one containing from 4 to 8 tubes. This is true for both disposal-at-failure and repairable modules. February 1960. 79 p. TN42 (PB151401). Analog-digital conversion equipment

for electrocardiographic data, L. Taback A corrected orthogonal 3-lead system has been used to record electrocardiograms directly from patients at Veterans Hospitals, using three FM channels of magnetic

tape. A pilot facility has been designed and assembled by NBS to permit a medical technician to inspect these on an

oscilloscope and select a significant cardiac cycle. This

is automatically sampled at millisecond intervals and the numerical values are stored in digital form on magnetic

tape acceptable to an electronic computer. Upon writing various programs for the digital computer, the cardiac researcher will have a flexible tool for objective analysis

of large quantities of biological data by a variety of possible

criteria. April 1960. 40 p. TN43 (PB151402). A summary of VHF and UHF tropospheric transmission loss data and

their long-term variability, D. A. Williamson, V. L. Fuller, A. G. Longley and P. L. Rice Cumulative distributions of hourly median basic trans- mission loss are presented for 135 beyond-line-of-sight radio paths in the United States. In order to allow for seasonal trends of transmission loss, the year is divided into a sum- mer period, May through October, and a winter period, November through April. The long-term variability of observed hourly medians

is compared with predicted variability based on empirical curves by Rice, Longley and Norton. March 1960. 174

P.TN44 (PB151403). Tables for the statistical prediction of radio ray bending and elevation angle error using surface values of the refractive index, B. R. Bean,

B. A. Cahoon and G. D. Thayer

Radio ray bending, T, and elevation angle error, E, have

been calculated for a wide range of meteorological conditions at 13 climatically diverse U.S. radiosonde stations.- The parameters in the observed linear regression equations

of T and E upon the surface value of the refractive index

are given for heights of 0.1 to 70 kilometers and initial elevation angles of the ray from 0 to 900 milliradians. March 16, 1960. 22 p. TN45 (PB151404). Operating instructions for ARN-2

auxiliary log-linear noise recorder, R. T. Disney and C. A. Samson

Auxiliary equipment has been added to the noise power

recorder, ARN-2, to measure the average voltage of the

noise envelope and the average logarithm of the noise envelope. These two additional parameters of the noise give enough information to determine the average characteristics of the noise. The operation of the equipment is discussed and standard operating procedures are outlined. January 1960. 30 p. TN46 (PB151405). Experimental plating of gun bores to retard erosion, V. A. Lamb and

J. P. Young

Methods for plating the bores of gun barrels are described, including details of fixture design, solution composition, and operating conditions. Extensive firing tests were performed, which show that chromium plate increases

the life of barrels about 2- to 5-fold, depending on the type and caliber of barrel. Optimum thickness of plate j ranges from 0.0015 inch in the smallest calibers to 0.015 j inch in cannon.

Certain modifications of the barrels enhance the im- j provement provided by the chromium plate. Choking of

' the bore at the muzzle produces a marked improvement

in accuracy life of caliber 0.30 and 0.50 barrels. It is less effective in barrels of larger caliber. Specially shaped

lands, designed to reduce the concentration of engraving ' stresses at land corners, significantly improve the perform- ance of 20 mm barrels. Other modifications, such as ; hardening of the basis steel by nitriding and increasing the length of the land "run-up", result in moderate im- provements in some types of barrels. Physical properties 1 of the chromium plates tested were varied. Ordinary "hard" chromium yields the best performance in most

types of barrels. Chromium plating has been adopted as standard pro- duction practice for caliber 0.30, 0.50, and 20 mm barrels, and for several calibers of cannon. May 1960. 99 p. TN47 (PB151406). An improved hydrogen atom beam

furnace, R. Klein and J. Pararas Am improvement in the construction of the tungsten

furnace for use in a hydrogen atom-beam apparatus has been effected by fabricating the furnace from a tungsten

rod. This avoids the possibility of leakage of molecular hydrogen which may occur when the tungsten tube is made from rolled tungsten sheet, the technique used

heretofore. The fabrication of the seamless furnace and

the method of mounting are described. May 1960. 7 p. TN48 (PB151407). Report on the IGY oblique-incidence sporadic-E and F-scatter program,

J. W. Finney and E. K. Smith The IGY Oblique-Incidence Sporadic-E Measurements program was instigated to test the longitude effect in temperate zone sporadic E. To accomplish this two CW

50 Mc circuits, both approximately 800 miles in length, were installed, one between the Philippines and Okinawa

in the Far East, and the other between Panama and Cuba

in the Caribbean. In addition to sporadic E a very

peculiar evening signal was observed during the equinoxes on the far eastern circuit which we have referred to as the "evening signal anomaly" or the "Far Eastern Anomaly".

Sporadic E, as expected, was three to five times more

frequent in the Far East than in the Caribbean, the factor depending upon what transmission loss level is taken. The evening signal anomaly appears to be of F-region

origin and is at least 100 times more frequent over the Far Eastern circuit. March 1960. 94 p. TN49 (PB151408). Dynamic measurements of the magnetoelastic properties of ferrites, V. E. Bottom The relations between the mechanical and magnetic

properties of a ferrite are derived for the small signal or

reversible condition using thermodynamic principles. The

equation of motion of a ferrite ring driven in its funda- mental mode is set up and solved leading to the equivalent

electrical circuit of the magnetostriction resonator. From

mechanical measurements of the density and dimensions

of the ring and electrical and frequency measurements of the resonator, the elastic modulus, permeability, magnetostriction coefficients and loss factors in the ferrite can be

determined. Apparatus is proposed for performing the above measurements. 1960. 43 p. TN50 (PB151409). Magnetic drum directory and pro- gramming system for codesorting

letter mail, P. C. Tosini This report is an analysis and extension of the Rabinow

Engineering Company's proposal for a magnetic drum

file-directory and special purpose computer to be used in 70
a test coded-address ("codesorting") letter-mail sorting system scheduled for late 1960 installation at the Washington, D.C. Post Office. The report is composed of 6 major sections that successively examine the major considerations involved. A short introduction is presented

first. Then the general problem of coding the fields composing addresses is discussed. This area is analyzed

in terms of facilitating both the human coding process and

the computer coded address-to-bin-number translation. Addresses are classified into two types: "standard" and

"non-standard". When coded, their fields must be unique and yet be sufficiently flexible to specify a variety of addresses. They must furthermore adequately specify some more common forms of misaddressed mail that is presently correctly sorted manually. A slightly amended

form of "Coding Plan E-l is then presented and analyzed

in terms of the conditions specified for coded addresses in general. After the presentation of the coding area, the local mail

sort translation program of the Rabinow proposal is dis- cussed in detail. It is then extended to include the out- going mail translation program and non-standard and

special address forms. The information and instruction characters necessitated by the programs are listed in detail and the effects of the file-directory source document preparation determined. A coding keyboard is then suggested. The programming is then reexamined and it is deter- mined that all addresses can be treated as special cases of the standard address forms at an increased cost in memory

space and with a saving in the special instruction symbols

required. Finally, alternative methods of file-directory information storage are explored and evaluated in terms

of memory space requirements, table look-up and directory

access times, and conceptual simplicity. June 1960. 54 p TN51 (PB161552). Isotopic abundance ratios reported for reference samples stocked by the National Bureau of Standards, F.

L. Mohler The National Bureau of Standards maintains a stock

of reference samples of isotopic abundance and this paper

gives results that have been reported on measurements

of these samples. Some information has been received on

24 of the 32 samples. The paper includes a list of the

reference samples and tables of the results reported with

notes on these results. May 1960. 14 p. TN52 (PB161553). Field strength calculations for E.L.F.

radio waves, J. R. Wait and N. F. Carter The mode theory of propagation of electromagnetic waves at extremely low frequencies (1.0 to 3000 c/s) is briefly reviewed in this paper. Starting with the repre- sentation of the field as a sum of modes, approximate

formulas are presented for the attenuation and phase constants. At the shorter distances, where the range is comparable to the wavelength, the spherical-earth mode

series is best transformed to a series involving cylindrical wave functions. This latter form is used to evaluate the

near field behavior of the various field components. The

effect of the earth's magnetic field is also evaluated using

a quasi-longitudinal approximation which is particularly appropriate for propagation in the magnetic meridian. In general it is indicated that if the gyro frequency is comparable or greater than the effective value of the

collision frequency, the presence of the earth's magnetic

field may be important for E.L.F. In this case the atten- uation may be increased somewhat. The influence of a

purely transverse magnetic field is also considered. This technical note is actually a numerical supplement

to the paper "Mode Theory and the Propagation of ELF

Radio Waves," by J. R. Wait, J. Research N.B.S., 64D,

July-Aug. 1960; however, for sake of completeness the

relevant theory is reviewed. March 1960. 35 p.

TN53 (PB161554). Carrier frequency dependence of the

basic transmission loss in tropospheric forward scatter propagation, K. A. Norton A further interpretation is given of certain Lincoln Laboratory data obtained in an experiment using scaled antennas as presented in a recent letter to the Proceedings

of the IRE from Bolgiano. This paper has four objectives: first, to clarify the significance of these data from

the standpoint of the engineer developing long-range

tropospheric scatter systems; second, to apply a further

statistical analysis to these data; third, to consider their significance as regards the theory of radio propagation through a turbulent atmosphere; and fourth, to describe a suitable method for the measurement of the meteorological parameters entering the theory. May 12, 1960. 64 p. TN54 (PB161555). Determination of a general index of

effort in sorting mail by conventional methods, S. Henig The conventional method of sorting letters in stages is described. It is shown, through reference to available

statistics, that about 90 percent of letters originating within the areas served by several large post offices will be

involved in no more than fivQ stages to be completely

sorted to a carrier, firm or section of boxes. A method is presented for the accounting of each stage's individual

letter readings which are defined as the units of measure- ment for the index of sorting effort. It is found that the upper bound average number of readings per letter for three large post offices varies from 3.16 to 2.98 and that

these bounds are applicable to 96.2 to 92.4 percent of the

local originating first class letters. It is anticipated that

the values of such indexes for all large post offices will be

consistently close to the range already determined. June

1960. 9 p. TN55 (PB 161556). Investigation of bearing creep of two

forged aluminum alloys, L. Mordfin, N. Halsey, and P. J. Granum

Fourteen bearing specimens of 7075-T6 and 2014-T6

forged aluminum alloys were tested in creep at 400° F. The 2014-T6 specimens had greater creep resistance and

less ductility than the 7075-T6 specimens. For each material the bearing creep resistance varied

directly with edge distance and bolt tightness. Prior ex- posure of the 2014-T6 alloy to elevated temperature

reduced its bearing creep resistance. The validity of a previously proposed theory of creep in bolted joints was examined using the test data together with results from an earlier study. The theory was found

to hold for 7075-T6 but not for 2014-T6. August 1960. 31 p. TN56 (PB161557). A bibliography of the physical equilibria and related properties of some

cryogenic systems, T. M. Flynn A bibliography of approximately 700 references is pre- sented on the physical equilibria and related properties of several important cryogenic systems. The systems considered are the pure components and mixtures of : Hydrogen, Helium, Nitrogen, Carbon Dioxide, Carbon Monoxide, Methane, Ethane, and Propane. May 1960. 123 p. TN57 (PB161558). Variable capacitor calibration with an

inductive voltage divider bridge, T. L. Zapf The use of an inductive voltage divider bridge for the

calibration of three-terminal and two-terminal variable air capacitors is discussed. May 1960. 6 p.

71
TN58 (PB161559). A survey and bibliography of recent research in the propagation of VLF

radio waves, J. R. Wait

This report presents a general, but brief, survey of the

field. Attention is confined primarily to terrestrial propagation, and thus solar and exospheric phenomena are generally excluded although certain germane references are given in the bibliography.

First a brief description of recent advances of ground wave propagation is given. This is followed by sections on

ray and mode concepts of ionospheric propagation. The

research dealing with the waveforms of atmospherics is

also considered. Finally some recent applications of VLF

propagation are described. While the emphasis is on the

theoretical approaches used, reference to corroborating ex- perimental work is included. It is hoped that the short- ,, comings in a brief article of this kind are partially compensated by the inclusion of an extensive bibliography on the

subject arranged under subject classification. While attention is confined primarily to the triennium (1957-59) a number of basic references prior to 1957 are included. i The VLF band is here defined as the decade 3 to 30 kc/s whereas the ELF band covers the range 1.0 c/s to 3 kc/s.

;j May 1960. 44 p.

72
4. TITLES OF PAPERS PUBLISHED IN OUTSIDE JOURNALS

1950 TO 1959 On pages 75 to 160 are listed papers by the Bureau staff that have

appeared in outside journals during the period 1950 to 1959. The listing is alphabetical by title under year of publication. Each paper is preceded by a number that serves to key the paper to the index. These papers are not for

sale by the Government, usually they may be obtained directly from the author or from the publisher of the appropriate journal.

1950

1. A class of mean value functions, E. F. Beckenbach. Am. Math. Monthly 57, No. 1,

1 (1950).

2. A comparison of meteor activity with occur- rence of sporadic E reflections, V. C. Pineo. Science 112, 50 (1950).

3. A new method for determining the value of the Faraday, D. N. Craig and J. I. Hoffman.

Phys. Rev. 80, 487 (1950).

4. A new technique for cutting very thin sections and its application to the electron microscopy

of fibers, S. B. Newman. ASTM Bull. 163, 57

(1950).

5. A note on the four by four Latin squares, W. J. Youden. Biometrics 6, 289 (1950).

6. A recording microwave refractometer , G. Birnbaum. Rev. Sci. Instr. 21, 169 (1950).

7. A reduction of area gage for use at low

temperatures, G. W. Geil and N. L. Carwile. ASTM Bull. 163, 75 (1950).

8. A remote- control method of opening ampoules of active materials, J. E. Sherwood.

Rev. Sci. Instr. 21, 570 (1950).

9. A resistance-temperature relation for low

temperature thermometry, H. J. Hoge. Rev.

Sci. Instr. 21, 815 (1950).

10. A source of error in. radio phase measuring systems, R. Bateman, E. F. Florman,

and A. Tait. Proc. IRE 38, 612 (1950).

11. A sulfate susceptibility test for portland cements, W. C. Taylor and R. H. Bogue.

Portland Cement Assoc. Fellowship 58, 223

(1950).

12. A survey of ceramics for nuclear reactors, R. F. GeUer. Nucleonics 7, No. 4, 3 (1950).

13. A thickness gage for ceramic coatings, C. C. Gordon and J. C. Richmond. J. Am.

Ceram. Soc. 33, 295 (1950).

14. A versatile pneumatic instrument based on

critical flow, W. A. Wildhack. Rev. Sci. Instr. 21, No. 1, 25 (1950).

15. A VHF match meter, P. G. Sulzer. Television Eng. 1, No. 7, 4 (1950).

16. Acceptance sampling by variables, with

special reference to the case in which quality

is measured by average of dispersion, J. H.

Curtiss. Acceptance Sampling: A symposium

given at the 105th annual meeting. Am.

Statistical Assoc. (Washington, D. C. ) (1950).

17. Unassigned.

18. Adjustment of high- precision frequency and

time standards, J. M. Shaull. Proc. IRE 38,

6 (1950).

19. Aging of Karakul and seal fur skins, E. T. Steiner and E. R. Hosterman. J. Am. Leather Chemists Assoc. 45, 579 (1950).

20. American Dental Association Specification No. 9 for dental silicate cement, First revision, effective July 1, 1950, G. C. Paffen- barger, A. C. Swaney, I. C. Schoonover, and

G. Dickson. J. Am. Dental Assoc. 40, 186

(1950).

21. Amerikanische Kunststoffentwicklung im

Jahre 1949, G. M. Kline. Kunststoffe (Munchen, Germany) 40, No. 2, 59 (19 50).

22. An analysis of some anomalous properties

of equiphase contours, G. A. Hufford. Proc. IRE 38, 614 (1950).

23. An elementary introduction to the calculus

of variations, M. R. Hestenes. Mathematics

23, No. 5, 249 (1950).

24. An instrument for mechanically differ- entiating curves, A. H. Scott. Rev. Sci. Instr. 21, 397 (1950).

25. Analysis of natural gas, M. Shepherd.

Anal. Chem. 22, 885 (1950).

26. Apparatus for determining freezing points

at saturation pressure from time- temperature

freezing and melting experiments, A. R. Glas- gow, Jr. , N. C. Krouskop, and F. D. Rossini.

Anal. Chem. 22, 1521 (1950).

27. Application of photoelectric multiplier tubes to the sensitive measurement of absorption or of changes of relative light intensities, O. Oldenberg and H. P. Broida. J. Opt. Soc. Am. 40, 381 (1950).

28. Atomic definition of primary standards, R. D. Huntoon and U. Fano. Nature (London, England) 166, 167 (1950).

29. Attenuation due to rainfall, H. E. Bussey. FM- TV Radio Commun. 10, No. 2, 12 (1950).

30. Background eradication in thick- layered emulsions, M. Wiener and H. Lagoda. Rev.

Sci. Instr. 21, No. 1, 39 (1950).

31. Calibration of audiometers, E. L. R. Corliss and W. F. Snyder. J. Acoust. Soc. Am.

22, 837 (1950).

32. Calibration of precision airplane mapping

cameras, F. E. Washer and F. A. Case. Photogrammetric Eng. 16, 502 (1950).

33. Cascade- connected attenuators , R. W.

Beatty. Proc. IRE 38, 1190 (1950).

34. Characteristics of the Institute for Nu- merical Analysis Computer, H. D. Huskey.

Math. Tables and Other Aids to Computation

4, No. 30, 103 (1950).

35. Chemical spectroscopy. 1950 Edgar Marburg Lecture before the American Society for Testing Materials, W. R. Brode. Am. Soc. Testing Materials Proc. 50, 513 (1950).

36. Coefficients for polar complex interpolation, H. E. Salzer. J. Math, and Phys. 24, No. 2, 96 (1950).

37. Color phase contrast microscopy: Require- ments and applications, C. P. Saylor, A. T. Brice, and F. Zernike. J. Opt. Soc. Am. 40, 329 (1950).

38. Color television, N. Smith. Sci. Am. 183, No. 6, 13 (1950).

39. Comparative tests in a single laboratory, W. J. Youden. ASTM Bull. 166, 48 (1950). 40. Comparison of variously derived solar indexes, H. S. Moore and M. Stein. J. Geophys. Research 55, 423 (1950). 41. Coupling chart for solenoid coils, P. G. Sulzer. Television Eng. 1, No. 6, 20 (1950). 42. Coverage of standard frequency station WWVH, E. L. Hall. Television Eng. 1, No. 8, 16; No. 10, 20 (1950).

43. Degradation of high polymers , R. Simha.

J. Polymer Sci. Letter to Editor 5, 515 (1950).

75
44. Depolymerization as a chain reaction. R. Simha, L. A. Wall, and P. J. Blatz. J. Polymer Sci. 5, 615 (1950).

45. Determination of attenuation from impedance measurements, R. W. Beatty. Proc. IRE 38, 897 (1950).

46. Determination of reverberant sound ab- sorption coefficient from acoustic impedance measurement, A. London. J. Acoust. Soc. Am. 22, 263 (1950).

47. Device for filtering and precise dispensing of solutions in closed systems, S. Roth- man. Anal. Chem. 22, 367 (1950).

48. Dispersion in NH, in the microwave region,

G. Birnbaum. PhysT Rev. 77, 144 (1950). 49. Dissociation constant of aqueous ammonia

at 0° to 50° from EMF studies of the ammonium salt of a weak acid, R. G. Bates and G.

D. Pinching. J. Am. Chem. Soc. 72, 1393

(1950).

50. Effect of fuel- immersion on laminated

plastics, W. A. Crouse, M. Carickhoff, and M. A. Fisher. Trans. Am. Soc. Mech.

Engrs. 72, 175 (1950).

51. Effects of acid treatment on acid and ab- rasion resistance of porcelain enamels, W. N. Harrison, J. C. Richmond, and J. R. Crandall. J. Am. Ceram. Soc. 33, 314 (1950).

52. El sistema I. C. I. para la especificacion.

del color, D. B. Judd. Anales de la Real

Sociedad Espanola de Fisica y Quimica

(Madrid, Spain) 46, 123 (1950).

53. Electron optical properties of space- charged clouds, L. Marton and D. L. Reverdin. J. Appl. Phys. 21, 842 (1950).

54. Electrons vs. photons: A comparison of microscopes, L. Marton. J. Opt. Soc. Am.

40, 269 (1950).

55. Evaluation of adhesives for acoustical tile, F. W. Reinhart, B. D. Loos, and N. J. DeLollis. ASTM Bull. 169, 57 (1950).

56. Exploration of electrostatic and magnetic

fields, L. Marton. Sci. Monthly 71, 3 (1950).

57. Factors affecting the water vapor permeability of leather, J. R. Kanagy and R. A. Vickers. J. Am. Leather Chemists Assoc.

45, 211 (1950).

58. Flow behavior of concentrated GR-S rubber

solutions, A. B. Bestul and H. V. Belcher.

J. Colloid Sci. 5, 303 (1950).

59. For wear prevention, S. A. McKee, J. F. Swindells, H. S. White, and W. Mountjoy. SAE J. 58, 47 (1950). 60. Forbidden lines in the spectra of impure mercury 198, K. G. Kessler. Phys. Rev.

77, 559 (1950).

61. Formulas for numerical mtegration of

first and second order differential equations

in the complex plane, H. E. Salzer. J. Math,

and Phys. 29, No. 3, 207 (1950).

62. Frequency and amplitude stability of the cathode- coupled oscillator, P. G. Sulzer. Proc. IRE 38, 540 (1950).

63. Galactic radio waves, G. Reber. Leaflet Astron. Soc. Pacific No. 295, (1950). 64. Generalization of a theorem of Osgood to the case of continuous approximation. A. M.

Ostrowski. Proc. Am. Math. Soc. 1, No. 5, 648 (1950).

65. Gibbs 1 phenomenon for Hausdorff means,

O. Szasz. Trans. Am. Math. Soc. 69, 440

(1950).

66. High- speed motion pictures in textile re- search. E. K. Fischer and J. C. Burnett.

Textile Research J. 20, 259 (1950).

67. Higher- order approximations in ionospheric wave- propagation, J. Feinstein. J. Geophys Research 55, 161 (1950).

68. How statistics improves physical, chemical, and engineering measurements, W. J. Youden. Revised text of a lecture, presented

earlier by Dr. Youden, has been issued in mimeographed form by (and copies are avail- able from) the Committee on Experimental

Design, Agricultural Research Administration, U. S. Department of Agriculture, Washington, D. C.

69. How the U. S. Weather Bureau uses Fax &

Telemetering: How FM expedites weather

data distribution, C. A. Kettering and G. F. Montgomery. FM- TV Radio Commun. 10, No. 10, 17 (1950). 70. Identification and microdetermination of nickel, H. I. Feinstein. Anal. Chem. 22, 723 (1950). 71. Index for rating diagnostic tests, W. J. Youden. Cancer 3, No. 1, 32 (1950).

72. Inequalities concerning ultraspherical polynomials and Bessel functions, O. Szasz. Proc. Am. Math. Soc. 1, No. 2, 256 (1950). 73. Influence of strain rate and temperature

on the creep of cold drawn ingot iron, W. D. Jenkins and T. G. Digges. Trans. Am. Soc. Metals 42, 1128 (1950).

74. Influence of temperature on the adsorption

of water vapor by collagen and leather, J. R. Kanagy. J. Am. Leather Chemists Assn.

45, 12 (1950).

75. Infrared absorption spectra of twelve

substituted benzene derivatives from 15 to 40 microns, E. K. Plyler. Faraday Society Dis- cussion No. 9, (University Press, Aberdeen,

England) (1950).

76. Instrumentation in perspective, W. A. Wildhack. Science 112, 515 (1950).

77. Interdisciplinary approach to science personnel, M. E. Stevens. Personnel Administration 12, No. 3, 27 (1950).

78. Intermediate- frequency gain stabilization with inverse feedback, G. F. Montgomery.

Proc. IRE 38, 662 (1950).

79. International exchange of scientific infor- mation, W. R. Brode. Chem. & Eng. News

28, 4332 (1950).

80. Ionosphere observations at 50 kc, J. N. Brown and J. M. Watts. J. Geophys. Research 55, 179 (1950).

81. Isotope effect in the superconductivity of mercury, E. Maxwell. Phys. Rev. 78, 477

(1950).

82. Lubrication of plain journal bearings, E. N. Bair, Sr. , S. A. McKee and H. S. White. The Virginia Tech. Eng. 23, 26 (1950).

83. Lunar stratification of the F2 layer at Huancayo, Peru. T. N. Gautier, R. W.

Knecht, and A. G. McNish. Proc. General Assembly, Intern. Sci. Radio Union (Zurich, Switzerland) Sept. 11-22, 1950, VIII, Pt. 2, 216 (1950).

76
83A. Matching loads on a magic tee, A. C. MacPherson and D. M. Kerns. Electronics

23, No. 9 (1950).

84. Matrix inversion by a Monte Carlo method,

G. E. Forsythe and R. A. Leibler. Math.

Tables and Other Aids to Computation 4, No.

31, 127 (1950).

85. Measurement of high temperatures in gas streams, A. I. Dahl. Bull. A & M College of Texas 5th series 6, 30 (1950) and Petrol Refiner 29, No. 3, 115 (1950).

86. Measurement of surface roughness of electrodeposited and electropolished surfaces by means of the microinterferometer , A. G. Strang and F. Ogburn. 37th Annual Proc. Am.

Electroplaters 1 Soc. 125 (1950).

87. Metric differential geometry, E. F. Beckenbach, Mathematics 23, No. 3, 143 (1950).

88. Microwave attenuation statistics estimated from rainfall and water vapor statistics, H. E. Bussey. Proc. IRE 38, 78l'(1950).

89. Microwave frequency dividers, H. Lyons.

J. Appl. Phys. 21, 59 (1950).

90. Microwave power stabilizer, I. K. Munson.

Rev. Sci. Instr. 21, 622 (1950).

91. Modification of electron microscope for electron optical shadow method, J. A. Simpson and A. Van Bronkhorst. Rev. Sci. Instr. 21, 669 (1950).

92. Modified resonant circuits match impedances, P. G. Sulzer. Tele- Tech. 9, No. 11, 41 (1950).

93. Monostable multivibrator design, G. F. Montgomery. Tele- Tech. 9, No. 10, 31 (1950).

94. Natural and synthetic rubbers, N. Bekkedahl. Anal. Chem. 22, 253 (1950).

95. Note on the focusing of electron beams in certain magnetic fields, P. A. Sturrock. Proc. Phys. Soc. (London, England) 63, 954

(1950).

96. Note on Vincent's theorem, A. M. Ostrowski. Annals of Math. 52, 702 (1950). 97. Notes on modern numerical analysis. I. Solution of differential equations by recurrence

relations, J. Todd. Math. Tables and Other

Aids to Computation 4, No. 29, 39 (1950). 98. Notes on numerical analysis, 2. Note on

the condition of matrices. O. Taussky. Math.

Tables and Other Aids to Computation 4, No.

30, 111 (1950).

99. Notes on the care and use of electrical in- struments, F. D. Weaver. Instruments 23, 1236 (1950).

100. Numerical evaluation of the Fermi betadistribution function, I. Feister. Phys. Rev.

78, 375 (1950).

101. Observations of second sound radiation by the thermal Pitot tube, J. R. Pellam.

Phys. Rev. 78, 818 (1950).

102. On a summation method of O. Perron,

O. Szasz. Math. Z. (Berlin, Germany) 52, 631 (1950).

103. On the Gibbs 1 phenomenon for Euler means, O. Szasz. Acta Scientiarum Mathe- maticarum (Szeged, Hungary) 12, Pt. B,

107 (1950).

104. On the relative extrema of Bessel function, O. Szasz. Bolletino della Unione Mathematica

Italiana (Bologna, Italy) (Firenze) III, 225

(1950).

105. On the relative extrema of the Laguerre

orthogonal functions, J. Todd. Bollettino

della Unione Matematica Italiana (Bologna,

Italy) Serie 3, Anno 5, No. 2, 122 (1950). 106. On the relative extrema of ultraspherical polynomials, O. Szasz. Bollettino della Unione Matematica Italiana (Bologna, Italy) Serie 3, Anno 5, No. 2, 125 (1950). 107. Petroleum hydrocarbons, B. J. Mair.

Ind. & Eng. Chem. 42, 1355 (1950). 108. Piezoelectric constants of alpha- and

beta- quartz at various temperatures, R. K. Cook and P. G. Weissler. Phys. Rev. 80, 712 (1950). 109. Plastics: Organic, F. W. Reinhart and

G. M. Kline. Medical Physics, Vol. II, 728

(1950). 110. Precision thermostat for high temperatures, W. R. Eubank. Rev. Sci. Instr. 21, 845 (1950). 111. Predicted lines of Fe I in the arc and in the sun, C. C. Kiess and C. E. Moore.

Astron. J. 55, 173 (1950). 112. Preparing cuprammonium solvent and

cellulose solutions, H. F. Launer and W. K.

Wilson. Anal. Chem. 22, 375 (1950).

113. Present status of standards for shoe last sizes, R. B. Hobbs. J. Nat. Assoc. Chiropodists No. 10, 30 (1950). 114. Review of "Proceedings of the Berkeley Symposium on Mathematical Statistics and

Probability, " C. Eisenhart. Psychometrica

15, 448 (1950).

115. Propagation of sound in rarefied helium, M. Greenspan. J. Acoust. Soc. Am. 22, 568, (1950).

116. Pyrolysis of hydrocarbon polymers, S. L. Madorsky. Science 111, 360 (1950).

117. Radio frequency mass spectrometer, W. H. Bennett. J. Appl. Phys. 21,2 (1950).

118. Radio noise of ionospheric origin, H. V.

Cottony. Science 111, 41 (1950).

119. Rapid extraction of resins from chilte and

guayule rubbers, J. W. Wood and R. J. Fanning. Rubber Age 68, No. 2, 195 (1950).

120. Rate of shrinkage of tendon collagen: Further effects of tannage and liquid environment

on the activation constants of shrinkage, C. E. Weir and T. J. Carter. J. Am. Leather Chemists Assoc. 45, 421 (1950).

121. Recombination and attachment in the Ft

region during the eclipse of May 20, 1947,

J. Savitt. J. Geophys. Research 55, 385

(1950). 122. Recording microwave refractometer , G. Birnbaum. Rev. Sci. Instr. 21, 2 (1950).

123. Reflected ray suppression, H. E. Bussey.

Proc. IRE 38, 1453 (1950). 124. Refractive index of silver chloride for visible and infrared radiant energy, E. K.

Plyler, L. W. Tilton and R. E. Stephens.

J. Opt. Soc. Am. 40, 540 (1950). 125. Refractory castables, preparation and some properties, R. A. Heindl and Z. A.

Post. J. Am. Ceram. Soc. 33, 230 (1950). 126. Unassigned.

77
127. Report of the Committee on Atomic

Weights of the American Chemical Society, E. Wichers. J. Am. Chem. Soc. 72, 1431

(1950).

128. Report on the methods used in the 1949 AGA- ASME orifice meter tests, F. M. Patridge. Instruments 23, 189 (1950).

129. Research on roofings, H. R. Snoke.

Building Research Advisory Board Conf. Report. Research Corporation Conf. (Building Research Advisory Board, Div. of Engr. and

Ind. , Natl. Res. Council, Washington, D. C.

(1950). 130. Safe floors and floor finishes, P. A.

Sigler. Soap and Sanit. Chemicals 26, No. 9, 121 (1950). 131. Saturation backscattering of positive electrons, H. H. Seliger. Phys. Rev. 78, 491 (1950).

132. Some economic aspects of the bone char process in sugar refining, V. R. Deitz and

J. M. Brown. Intern. Sugar J. (London,

England) 52, 147 (1950). 133. Some statistical designs for experiments,

G. Warren. Proc. 12th Annual Porcelain Enamel Inst. Forum (University of Illinois, Urbana, Illinois) p. 76 (1950).

134. Specification of color rendering properties of fluorescent lamps, C. W. Jerome and

D. B. Judd. Preprint No. 4, Natl. Tech.

Conf. of the Ilium. Eng. Soc. , Pasadena,

California (Aug. 21-24, 1950).

135. Stable electronic voltage regulator, P. G. Sulzer. Electronics 23, No. 12, 162 (1950).

136. Standards help in the selection of sheets and pillowcases, W. D. Appel. Hospitals 24, 82 (1950). 137. Statistics and planning tests at elevated temperatures, W. J. Youden. Proceedings

of the Society for Experimental Stress Analysis XI, No. 2, 219 (1950). 138. Statistics in analytical chemistry, W. J. Youden. Ann. New York Acad, of Sci. 52, Art. 6, 815 (1950). 139. Stress- strain and elongation graphs for alclad aluminum- alloy 24S-T86 sheet, J. A.

Miller. Natl. Advisory Comm. for Aeronaut.

Washington, D. C. TN 2094 (1950).

140. Stroboscopic mapping of time- variable

fields, L. Marton and D. L. Reverdin. J. Appl. Phys. 21, 617 (1950).

141. Studies on galvanic couples. I. Measure- ment of electromotive force and internal re- sistance of cells during current flow, H. D.

Holler. J. Electrochem. Soc. 97, 271 (1950).

142. Studies on galvanic couples. II. Some

potential- current relations in galvanic corrosion, H. D. Holler. J. Electrochem. Soc.

97, 277 (1950). 143. Studies on galvanic couples. III. Polarization and cathodic protection, H. D. Holler.

J. Electrochem. Soc. 97, 453 (1950). 144. Study of radio reflections from meteor

trails in research on the upper atmosphere,

A. G. McNish. Air Force Cambridge Research Center: Geophysical Research Paper

No. 7 (Proc. of the Conf. on Ionospheric Res. , June 1949), p. 105 (1950).

145. Summation of slowly convergent series, 0. Szasz. J. Math, and Phys. 28, No. 4, 272 (1950). 146. Tables of integrals of Struve functions, M. Abramowitz. J. Math, and Phys. 29, 49

(1950).

147. Errata in "Tables relating to Hankel in- tegrals of order zero", by L. Schwarz, published in Luftfahrtforschung, 20, No. 12, 341 (1943), and translated by J. Lotsof, Cornell Aeronautics Laboratory, May 1946. Math. Tables and Other Aids to Computation

IV, No. 30, 100 (1950). 148. The atomic clock, a universal standard

of frequency and time, H. Lyons. The American Scholar 19, 159 (1950). 149. The condition of a certain matrix, J. Todd. Proc. Cambridge Phil. Soc. 46, Pt.

1, 116 (1950). 150. The disintegration scheme of I , I. Feister and L. F. Curtiss. Phys. Rev. 78, 179 (1950).

151. The influence of the ground on the cali- bration and use of VHF field- intensity meters,

F. M. Greene. Proc. IRE 38, No. 6 (1950). 152. The Institute for Numerical Analysis. An

unsigned item prepared by J. H. Curtiss and

published in the University of California Faculty Bulletin (Berkeley, California) 19, No. 7, 67 (1950). 153. The preparation of high- purity hydrogen

deuteride, A. Fookson, P. Pomerantz, and

E. H. Rich. Science 112, 748 (1950).

154. The present status of color television; a report by the Senate Advisory Committee on

Color Television, N. Smith, E. U. Condon,

S. L. Bailey, W. L. Everitt and D. G. Fink. Proc. IRE 38, 980 (1950).

155. The selection of a limited number from many possible conditioning treatments for alloys to achieve best coverage and statistical evaluation, J. M. Cameron and W. J. Youden. Am. Soc. Testing Materials Proc. 50, 951

(1950).

156. Theoretical analysis of fractionating pro- cess of adsorption, B. J. Mair, J. W. Westhaver, and F. D. Rossini. Ind. & Eng. Chem.

42, 1279 (1950). 157. Thermal rayleigh disk in liquid helium II, J. R. Pellam and P. M. Morse. Phys. Rev.

78, 474 (1950). 158. Those government researchers, H. N. Eaton. Plumbing and Heating Business 13, No. 4, 58 (1950). 159. Transmission of reverberant sound

through double walls, A. London. J. Acoust.

Soc. Am. 22, 270 (1950). 160. Treatment of leather with Castiloa and Hevea rubbers, R. Oehler, T. J. Kilduff, and S. Dahl. J. Am. Leather Chemists

Assoc. 45, 378 (1950). 161. Tritanopia with abnormally heavy ocular

pigmentation, D. B. Judd, L. Plaza, and D. Farnsworth. J. Opt. Soc. Am. 40, 833

(1950). 162. Tungsten helical spring balance, S. L. Madorsky. Rev. Sci. Inst. 21, 393 (1950).

78
163. Units of radioactivity, L.. F. Curtiss, R. D. Evans, W. Johnson, and G. T. Seaborg. Rev. Sci. Instr. 21, 94 (1950). 164. Use of admixtures as integral waterproofing and dampproofing materials, B. E. Foster.

J. Am. Concrete Imst. 22, (Proc. 47), 46

(1950). 165. Use of statistics to determine precision

of test methods, W. J. Youden and J. M.

Cameron. Am. Soc. Testing Materials Spec. Tech. Publ. No. 103, 27 (1950). 166. "Viscosities of very dilute polymer solutions, S. Rothman, R. Simha, and S. G. Weissberg. J. Polymer Sci. 5, 141 (1950). 167. Volume changes in small concrete cylin- ders during freezing and thawing, R. C. Valore, Jr., Title No. 46-26 J. Am. Concrete

Inst. 21, 417 (1950).

168. VTM circuits, M. C. Selby. Electronics

23, No. 5, 110 (1950). 169. Wide- band FM adapter reduces interfer- ence, P. G. Sulzer. Radio- Electronics 21, 24 (1950). 170. Wide range decade frequency generator,

J. M. Shaull. Tele- Tech 9, No. 11, 36

(1950). 171. Wide- range R-C oscillator, P. G. Sul- zer. Electronics 23, No. 9, 88 (1950).

172. X-ray calibration of radiation survey meters, pocket chambers and dosimeters,

F. H. Day, Ra-Det (Tech. Info. Div. ORE, AEC, Oak Ridge, Tenn. ) 3, No. 4, 3 (1950). 173. Zirconia and alumina shapes, L. E. Mong and J. J. Donoghue. Am. Ceramic Soc.

Bull. 29, 405 (1950).

79
1951

174. A bar magnet velocity meter , T. A. Perls

and E. Buchmann, Rev. Sci. Instr. 22, 475

(1951).

175. A ceramic accelerometer of wide frequency range, L. T. Fleming. Instruments 24, No. 8, 105 (1951).

176. A circuit for simultaneously recording the range, amplitude, and duration of radar- type

reflections, V. C. Pineo and R. C. Peck. Rev.

Sci. Instr. 22, 112 (1951).

177. A guide to tables on punched cards, G. Blanch and E. C. Yowell. Math. Tables and

Other Aids to Computation 5, No. 36, 185

(1951). 178. A high temperature, broad-band Stark cell for microwave spectroscopy, L. J. Rueger,

H. Lyons, and R. G. Nuckolls. Rev. Sci.

Instr. 22, 428 (1951). 179. A logarithmic slidewire for a self-bal- ancing potentiometer, M. Greenspan and M. C. Thompson, Jr. Rev. Sci. Instr. 22, 799

(1951).

180. A new method for the measurement of the isotopic abundance of solids, H. Somer and

J. A. Hippie. Phys. Rev. 83, 229 (1951).

181. A note on a bridged- T network, P. G. Sulzer. Proc. IRE 39, 819 (1951).

182. A proposed training program, W. S. Bussey. Scale J. 37, No. 7, 4 (1951).

183. A reflectionless waveguide termination, R. E. Grantham. Rev. Sci. Instr. 22, 828,

(1951). 184. A simple type X(t) - Y recorder, T. A. Perls and W. A. Wildhack. Rev. Sci. Instr. 22, No. 7, 541 (1951).

185. A "Simpson's rule" for the numerical

evaluation of Weiner's integrals in function space. R. H. Cameron. Duke Math. J. 18, No. 1, 111 (1951). 186. A source of error in radio phase measuring systems (Discussion), R. Bateman, E. F. Florman, A. Tait, and E. Rechtin. Proc. IRE 39, 436 (1951).

187. A survey of audio- frequency power amplifier circuits, P. G. Sulzer. Audio Eng. 35, No. 5, 15 (1951).

188. Accomplishments at the International Conference in Bournemouth, England, Part

III, W. D. Appel. (Technical Committee on

Textiles International Organization for Standardization (ISO) Meeting). Am. Dye stuff Reptr. 40, No. 23, 735 (1951).

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195. Applications of the theory of quadratic forms in Hilbert space to the calculus of variations, M. R. Hestenes. Pacific J. Math. 1, No. 4, 525 (1951).

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198. Basic standards in science, E. U. Condon.

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of Standards, L. D. C. Nobel. Inforitnes construe. (Madrid, Spain) 4, No. 36, 1 (1951). 201. Ceguera para el color y teorias de la vision cromatica, D. B. Judd. Anales real

soc. espan. fis. y quim. (Madrid, Spain). 47, 35 (1951). 202. Certain Fourier transforms of distri- butions, E. Lukacs and O. Szasz. Can. J. Math. 3, No. 2, 140 (1951). 203. Change of free energy with pressure of

the reaction nepheline+albite=2 jadeite, H. S. Yoder and C. E. Weir. Am. J. Sci. 249, 683,

(1951). 204. Checking money- value graduations on a computing scale, W. S. Bussey. Scale J. 38, No. 2, 6 (1951). 205. Classes of matrices and quadratic fields, O. Taussky. Pacific J. Math. 1, 127 (1951). 206. Combination bands of ethylene, E. K.

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and J. E. Weir. Trans. Am. Soc, Mech.

Engrs. 73, 183 (1951). 209. Comparing outputs from precision time

standards, J. M. Shaull and C. M. Kortman.

Electronics 24, No. 4, 102 (1951). 210. Constant- amplitude oscillator. N. C. Hekimian. Electronics 24, 164 (1951). 211. Correction factors for the balancing effect

in one leg of a U-type manometer, H. S. Bean. Gas 27, 48 (1951). 212. Correction factors for the balancing effect

of a gas in one leg of a manometer, H. S. Bean

and F. C. Morey. Instruments 24, 528; Oil and Gas J. 50, No. 11, 107 (1951). 213. Corrosion factors in design, F. M. Reinhart. Product Engr. 22, No. 7, 101 (1951).

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functions, M. Abramowitz. J. Math, and

Phys. 29, 303 (1951). 215. Crystal chemistry symposium, F. Ordway. Ceram. Age 58, No. 5, 28 (1951). 216. Design details of a linear magnetic UHF

oscillator attenuator, F. Reggia. FM-TV

Radio Commun. 11, No. 10, 16 (1951). 217. Deterioration of silicate cements in the tropics, T. E. Fischer and I. C. Schoonover.

U. S. Armed Forces Med. J. 2, 907 (1951). 218. Determination of dissociation constants

in a mixture of two weak acids by electromotive

force measurements, R. G. Bates. J. Am.

Chem. Soc. 73, 2259 (1951). 219. Determination of grease in leather, E. W. Zimmerman and E. F. Pangborn. J. Am.

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(1951). 224. Directional distribution of 1040-kev radiation from a high voltage X-ray tube, N. Goldstein, U. Fano, and H. O. Wyckoff. J. Appl. Phys. 22, 417 (1951). 225. Dispersion of F2-layer critical frequencies, M. L. Phillips and H. S. Moore. Proc. IRE 39, 717 (1951). 226. Early work in applied optics at the National Bureau of Standards, E. C. Crittenden. J. Opt. Soc. Am. 41, 367 (1951). 227. Effect of melamine resin on chemical

tests of paper, W. K. Wilson, J. L. Harvey,

and A. A. Padgett. Tappi 34, 410 (1951). 228. Effective earth's radius for radiowave

propagation beyond the horizon, W. Miller.

J. Appl. Phys. 22, No. 1, 55 (1951). 229. Effects of ionosphere disturbances on low

frequency propagation, J. M. Watts and J. N. Brown. J. Geophys. Research 56, No. 3, 403,

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statistical decision procedures and zero- sum

two-person games, A. Dvoretzky, A. Wald, and

J. Wolfowitz. Ann. Math. Stat. 22, 1 (1951). 232. Emission spectrographs standards, B. F. Scribner and C. H. Corliss. Anal. Chem. 23, 1548 (1951). 233. Evaluation of automatic computing machines, F. L. Alt. Product Engr. 22, No. 11, 146 (1951). 234. Evaluation of coaxial slotted- line impedance measurements, H. E. Sorrows, W. E. Ryan and R. C. Ellenwood. Proc. IRE 39, 162 (1951).

235. Fifth- order aberration in an optical sys- tem, R. K. Anderson. Proc. Computation Seminar (IBM) p. 130 (IBM Corp. , 590 Madison Ave. , New York, N. Y. ) (1951). 236. Fifty years of scientific standardization, E. C. Crittenden. Standardization 22, No. 11, 349 (1951). 237. Film- forming properties of cellulose acetate propionates. Effect of solvents, diluents, and plasticizers. A. G. Roberts and S. G. Weissberg. Ind. Eng. Chem. 43, 2088 (1951). 238. Fixed capacitors of electronic circuits, P. S. Schmidt. Elec. Mfg. 47, No. 5, 100 (1951). 239. Fixture unit ratings as used in plumbing system design, H. N. Eaton and J. L. French. Housing and Home Finance Agency Housing Research Paper No. 15(1951).

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of a complex variable, H. E. Salzer. Math.

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Salzer. Math. Tables and Other Aids to Computation 5, No. 36, 213 (1951). 243. Gated- beam mixer, S. Rubin and G. E. Boggs. Electronics 24, 196 (1951). 244. Gauss to Gerling on relaxation, G. E. Forsythe. Math. Tables and Other Aids to Computations, No. 36, 255 (1951). 245. Grease consistometer is modified to operate at constant shear rates, higher viscosities, H. W. White. Petroleum Processing 6, 285

(1951). 246. Heat capacity of crystalline dextrose between 25° and95°C. T. B. Douglas, A. F.

Ball, and J. L. Torgesen. J. Am. Chem.

Soc. 73, 1360 (1951). 247. Heat delivery in a compressible flow and

applications to hot-wire anemometry, C. M.

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explosion limit, H. P. Broida. J. Chem. Phys.

19, 790 (1951). 249i Identities and inequalities concerning

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N. Smith. (Part of a Conference on the sun in the service of man. ) Proc. Am. Acad. Arts

Sci. 79, 181 (1951). 250A. Information theory, C. H. Page. J. Wash.

Acad. Sci. 41, 245 (1951). 251. Interlaboratory comparison of thermal

conductivity determinations with guarded hot

plates, H. E. Robinson and T. W. Watson. Am. Soc. Testing Materials Spec. Tech. Publ. No. 119 (1951). 252. List of geomagnetic observatories and

thesaurus of values, H. F. Johnston. J. Geophys. Research 56, 431 (1951). 253. Locating sources of variability in a process, W. J. Youden. Ind. Eng. Chem. 43, 2059 (1951). 254. Magnetic susceptibility of manganese sole- nide, R. Lindsay. Phys. Rev. 84, 569 (1951).

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255. Materials, W. R. Brode. J. Franklin

Inst. 25, 81 (1951). 256. Measuring power factor of low- loss di- electrics, J. L. Dalke and R. C. Powell.

Electronics 24, No. 8, 224 (1951). 257. Measuring time and frequency in Hawaii,

V. E. Heaton. Tele- Tech. 10, No. 3, 36

(1951). 258. Microwave components: Precision casting

vs. electroforming, A. A. Feldmann. Materials and Methods 34, No. 1, 70 (1951). 259. Microwave measurements of the dielectric properties of gases, G. Birnbaum, S. J. Kryder and H. Lyons. J. Appl. Phys. 22, No.

1, 95 (1951). 260. Microwave spectra of deutero- ammonias,

H. Lyons, L. J. Rueger, R. G. Nuckolls and M. Kessler. Phys. Rev. 81, 630 (1951). 261. Modified locked- oscillator frequency di- viders, P. G. Sulzer. Proc. IRE 39, 1535

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solutions, R. G. Bates. Anal. Chem. 23, 813

(1951). 263. Motion in the solar atmosphere as deduced from radio measurements, G. Reber. Science

113, No. 2934, 312 (1951). 264. Natural and synthetic rubbers, N. Bekkedahl. Anal. Chem. 23, 243 (1951). 265. Net heat of combustion of AN-F-58 air- craft fuels, S. Rothberg and R. S. Jessup.

Ind. Eng. Chem. 43, 981 (1951). 266. New light on self- ignition, N. D. Mitchell.

Natl. Fire Prot. Quart. 45, No. 2, 165 (1951). 267. New matrix transformations for obtaining characteristric vectors, W. Feller and G. E. Forsythe. Quart. Appl. Math. 8, No. 4, 325

(1951). 268. New resolving power test chart, F. E. Washer and F. W. Rosberry. J. Opt. Soc. Am. 41, 597 (1951). 269. New tools for research, W. A. Wildhack.

Science 114, No. 2962, 3 (1951). 270. Note on an infinite integral, A. M.

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(1951). 272. Notes on numerical analysis. 5. Table- making for large arguments. The exponential

integral, L. Fox and J. C. P. Miller. Math.

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(1951). 273. NRL Aleutian radio eclipse expedition, J. Hagen, F. T. Haddock, and G. Reber. Sky

and Telescope 10, No. 5, 111 (1951). 274. Numerical methods associated with Laplace's equation, W. E. Milne. Proc. of a Second Symposium on Large- Scale Digital Calculating Machinery, Annals of the Harvard

Computation Laboratory (Cambridge, Massachusetts), XXVI, 152 (1951). 275. On a Tauberian theorem for Abel summability, O. Szasz. Pacific J. Math. 1, 117

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277. On singular pertubation problems in theory of non- linear vibrations, W. Wasow.

Actes du Colloque International des Vibrations Non Lineaires, lie de Porquerolles, France.

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12, 1950, 189 (1951). 279. On some trigonometric transforms. O. Szasz. Pacific J. Math. 1, No. 2, 291 (1951). 280. On subharmonic, harmonic, and linear functions of two variables, E. F. Beckenbach.

Revista Universidad Nacional del Tucuman,

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their application to electron optics, P. A.

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problems and paradoxes of precision. F. B.

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States, G. M. Kline. ASTM Bull. No. 178, 32

(1951). 289. Problems of drainage and venting, R. S. Wyly. Master Plumber and Heating Contractor

21, No. 3, 22 (1951). 290. Proposals for the mechanical resolution of German syntax patterns, V. A. Oswald, Jr., and S. L. Fletcher, Jr. Modern Language For- um 36, No. 3-4, 1 (1951). 291. Pyrolysis of mixtures of ethane and ethaned, , L. A. Wall and W. J. Moore. J. Am. Chem.

Soc. 73, 2840 (1951). 292. Quantitative determination of natural rub- ber hydrocarbon by refractive index measurements, R. J. Fanning and N. Bekkedahl. Anal. Chem. 23, 1653 (1951). 293. R-branch heads of some COz infrared bands in the CO+O, flame spectrum. W. S. Benedict, R. C. Herman, and S. Silverman.

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vacuum tube accelerometer , S. Levy. Proc.

Soc. Exptl. Stress Anal., 9, No. 1, 151 (1951). 298. Recurrent determinants of Legendre and

of ultraspherical polynomials, E. F. Beckenbach, W. Seidel and O. Szasz. Duke Math. J. 18, 1, 1 (1951). 299. Relations among certain ranges of vector measures, A. Dvoretzky, A. Wald and J. Wolfowitz. Pacific J. Math. 1, 59 (1951). 300. Relative back- scattering of electrons and

positrons, W. Miller. Phys. Rev. 82, No. 3, 452 (1951). 301. Unassigned.

302. Resin bonding of hardwood fibers in offset papers, B. W. Scribner, M. B. Shaw, M. J.

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(1951). 303. Resin bonding of offset papers containing mineral fillers, M. J. O'Leary, B. W. Scrib- ner and J. K. Missimer. Tappi 34, 506 (1951). 304. Rotational temperatures of OH in methaneair flames, H. P. Broida. J. Chem. Phys.

19, 1383 (1951). 305. Second order determinants of Legendre

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Reinhart. Product Engr. 22, 123 (1951). 307. Some aspects of depolymerization kinetics, R. Simha and L. A. Wall. J. Polymer

Sci. 6, No. 1, 39 (1951). 308. Some factors influencing the road wear of

tires, R. D. Stiehler, M. N. Steel, and J. Mandel. Trans. Inst. Rubber Ind. (Cambridge,

England) 27, No. 6, 298 (1951). 309. Some problems in ult ramie rotomy, S. B. Newman. Bull. Intern. Assoc. Med. Museums

32, 100 (1951). 310. Some problems on random walks in space,

A. Dvoretzky and P. Erdos. Second Berkeley Symposium on Mathematical Statistics and

Probability held by the University of California from July 31 to Aug. 12, 1950, 353 (1951). 311. Special lubricants tests, H. S. White and

D. Zei. Mech. Eng. 73, 657 (1951). 312. Specific heat of beryllium between 0° and

900° C. , D. C. Ginnings, T. B. Douglas and

A. F. Ball. J. Am. Chem. Soc. 73, 1236

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Forziati and R. E. Reeves. J. Am. Chem.

Soc. 73, 4484 (1951). 315. Spurious resolution of photographic lenses, R. N. Hotchkiss, F. E. Washer, and F. W.

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316. Standards for electrical measurements,

F. B. Silsbee. Elec. Eng. 70, No. 3, 202

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H. E. Bussey. Tele- Tech. 10, No. 12, 45

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J. I. Hoffman. Sci. Am. 185, No. 4, 26 (1951). 319. Systematic ionospheric winds, C. D. Salz- berg and R. Greenstone. J. Geophys. Research

56, No. 4, 521 (1951). , 320. Table of the integral, ) e~ H- du. M.

Abramowitz. J. Math, and P?iys. 30, No. 3 162 (1951). 321. Tauberian theorems for summability

(Rj), O. Szasz. Am. J. Math. 73, No. 4, 779

(1951). 322. Technetium in the sun, C. E. Moore.

Science 114, 59 (1951). 323. Technical aspects of industrial and office quieting, A. London. Proc. Second Annual

Nat. Noise Abatement Symp. , Armour Research

Foundation (Chicago, Illinois) 2, 75 (1951). 324. Technique for locating sources of variability in a process, W. J. Youden. Ind. Eng. Chem. 45, No. 9, 2059 (1951). 325. Textile Forschung and Prufung am National Bureau of Standards, H. F. Schiefer. Son- derdruck aus Melliand Textilberichte (Heidel- berg, Germany) 32, No. 125, 188 (1951). 326. The cascade- binary counter with feedback,

G. F. Montgomery. J. Appl. Phys. 22, 780

(1951). 327. The chemistry of portland cement, R. H. Bogue. Editorial Dossat, S. A. (Madrid,

Spain) (1951). 328. The construction and operation of thoria

resistor- type furnaces, S. M. Lang and R. F.

Geller. J. Am. Ceram. Soc. 34, 193 (1951). 329. The convergence of Seidel iterants of nearly symmetric matrices, P. Stein. Math.

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eigenvalues of symmetric matrices, E. C. Yowell. Proc. Computation Seminar, IBM,

p. 112 (1951). 331. The determination of freezing point of engine antifreezes, R. E. Mallonee and F. L. Howard. ASTM Bull. No. 172, 43 (1951). 332. The determination of nitrogen in leather by the Kjeldahl method, S. Dahl and R. Oehler.

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19, 797 (1951). 334. The estimation of parameters in certain

stochastic processes, H. B. Mann. Sankhya

(Calcutta, India) 11, Pt. 2, 97 (1951). 335. The fisherian revolution in methods of an

experimentation, W. J. Youden. J. Am. Stat. Assoc. 46, 47 (1951). 336. The gated-beam mixer, S. Rubin and G. Boggs. Electronics 24, No. 10, 196 (1951). 337. The Institute for Numerical Analysis of the National Bureau of Standards, J. H. Curtiss. Monthly Research Rept. of the Office of Naval Research, Dept. Navy P. 8 (Issue of May 1951); Abbreviated version in Am. Math. No. 58, 372,

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meteor trails, J. Feinstein. J. Geophys. Research 56, No. 1, 37 (1951). 339. The National Bureau of Standards and its international relations, W. R. Brode. Foreign Commerce Weekly 42, No. 1-1, 3 (1951). 340. The rating of water- current meters, R. H. Dickman. Water Power (Westminister, England) 3, 330 (1951). 341. The relation between the absorption spectra and the chemical constitution of dyes. XXII.

Cis- trans isomerism in thioindigo dyes, G. M. Wyman and W. R. Brode. J. Am. Chem. Soc.

73, 1487 (1951). 342. The relation between the absorption spectra and the chemical constitution of dyes. XXIV.

Absorption spectra of some thioindigo dyes in sulfuric acid, W. R. Brode and G. M. Wyman.

J. Am. Chem. Soc. 73, 4267 (1951). 343. The sea- level latitude variation of fast cosmic- ray neutrons, P. S. Gill and L. F. Curtiss. Phys. Rev. 84, 591 (1951).

344. The tensile forces in tightened bolts, A. H.

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345. The thermal hydrogen- oxygen reaction at relatively low temperatures, H. P. Broida

and O. Oldenberg. J. Chem. Phys. 19, 196

(1951). 346. The use of components of variance in pre- paring schedules for sampling of baled wool,

J. M. Cameron. Biometrics 7, 83 (1951).

347. The variation with frequency of the signal range of FM and television broadcasting

stations, K. A. Norton and E. W. Allen. J. Brit. Inst. Radio Engr. 11, 93 (1951).

348. The wave- frequency dependence of the duration of radar- type echoes from meteor

trails, V. C. Pineo and T. N. Gautier. Science

114, 460 (1951). 349. Transmittance of cesium bromide crystals, E. K. Plyler and F. P. Phelps. J. Opt. Soc. Am. 41, 209 (1951).

350. Treadwear of tires. Influence of type of rubber and black. J. Mandel, M. N. Steel and

R. D. Stiehler. Ind. Eng. Chem. 43, 2901

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(1951). 353. Two consequences of the transposition theorem on linear inequalities, T. S. Motzkin. Econometrica 19, No. 2, 184 (1951). 354. Two- stage autoignition of some hydrocarbons, W. J. Levedahl and F. L. Howard.

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An interview with J. H. Curtiss. Product Eng.

22, 156 (1951). 356. Volume- temperature relationships for the room temperature transition in Teflon, F. A. Quinn, Jr. , D. E. Roberts and R. N. Work. J. Appl. Phys. 22, 1084 (1951). 357. Wide- range resonators for VHF and UFH,

G. F. Montgomery and P. G. Sulzer. Electronics 42, No. 5, 200 (1951).
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in the restricted problem of three bodies, A.

Goldstein and C. E. Froberg. Kgl. Fysiograf.

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H. A. Sommer. Phys. Rev. 85, 714 (1952).

361. A comparison of CW field intensity and

backscatter delay, W. L. Hartsfield and R.

Silberstein. Proc. IRE 40, 1700 (1952). 362. A comparison of methods for evaluating trends in time series of tropospheric radio

field strength data, P. L. Rice. IRE Trans.

Ant. Prop. AP-3, 144 (1952). 363. A hydride bath for the electrodeposition

of aluminum, D. E. Couch and A. Brenner.

J. Electrochem. Soc. 99, No. 6, 234 (1952). 364. A low voltage regulator, S. Rubin. Television Eng. 3, No. 3, 8 (1952). 365. A meter for timing the flow of very small volumes of a gas, J. C. Westmoreland. Natl. Advisory Comm. Aeronaut. RM 52109 (1952). 366. A method for the determination of con- verging factors, applied to the asymptotic ex- pansions for the parabolic cylinder functions,

J. C. P. Miller. Proc. Cambridge Phil. Soc. (London, England) 48, Pt. 2, 243 (1952). 367. A model for epitaxy in metal- rock salt pairs, O. G. Engel. J. Chem. Phys. 20, No. 7, 1174 (1952). 368. A new infrared band system of FeO,

A. M. Bass and W. S. Benedict. Astrophys.

J. 116, 652 (1952). 369. A new kind of radio propagation at very

high frequencies observable over long dis- tances, D. K. Bailey, R. Bateman, L. V. Berkner, H. G. Booker, G. F. Montgomery,

E. M. Purcell, M. W. Salisbury and J. B. Wiesner. Phys. Rev. 86, No. 2, 141 (1952). 370. A note on a selective R-C bridge, P. G.

Sulzer. Proc. IRE 40, 338 (1952). 371. A note on the polarization of low frequency

ionosphere echoes, J. M. Watts. J. Geophys. Research 57, No. 2, 287 (1952). 372. A numerical solution of the helium wave

equation with the SEAC, J. H. Wegstein. Proc.

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377. A source of error in the measurement of radiated harmonics, F. M. Greene. Proc. IRE 40, 486 (1952). 378. A statistical approach to the problem of multiple radio interference to FM and tele- vision service, K. A. Norton, H. Staras, and M. Blum, IRE Trans. Ant. Prop. AP- 1 , 43

(1952). 379. A suggested program for industry- spon- sored shoe research, R. B. Hobbs. Leather

and Shoes 123, 8 (1952). 380. A theorem on convex cones, with appli- cations to linear inequalities, J. W. Gaddum.

Proc. Am. Math. Soc. 3, No. 6, 957 (1952). 381. A variable heart pump permitting independent control of rate, output, and ejection

velocity, H. P. Broida, E. D. Freis, and J. C. Rose. Science 115, No. 2996, 603 (1952). 382. Abrasion resistance measurements on

cotton fabrics made with the blade type abradant and the Schiefer abrasion testing machine,

H. F. Schiefer. Proc. Spring Meeting, Textile Qual. Control Assoc. p. 65 (1952). 383. Absence of spontaneous emission of neutrons from samarium, S. D. Chatterjee and R. N. Olcott. Phys. Rev. 85, 147 (1952). 384. Adiabatic demagnetization and the temperature scale below 1 °K, D. de Klerk. Science

116, 335 (1952). 385. Aging changes in clinical thermometers,

L. C. Liberatore and R. E. Wilson. J. Am.

Ceram. Soc. 35, 203 (1952). 386. Alternative derivations of Fox's escalator formulae for latent roots, G. E. Forsythe.

Quart. J. Mech. and Appl. Math. (London,

England) 5, Pt. 2, 191 (1952). 387. Amelung glasses compared with some modern commercial glasses, D. Hubbard,

L. B. Jenkins, and E. M. Krumrine. Sci. Monthly LXXV, No. 6, 327 (1952). 388. An alkaline solution of potassium chro- mate as a transmittancy standard in the ultraviolet, G. W. Haupt. Condensation of this paper appeared in J. Opt. Soc. Am. 42, 441 (1952). 389. An alternative "predictor- corrector"

process, T. H. Southard and E. C. Yowell. Math. Tables and Other Aids to Computation

VI, No. 40, 253 (1952). 390. An elementary note on powers of quaternions, H. E. Salzer. Amer. Math. Mo. 59, No. 5, 298 (1952). 391. An essential property of the Fourier trans- forms of distribution functions, E. Lukacs.

Proc. Am. Math. Soc. 3, No. 3, 508 (1952). 392. An experimental rapid access memory

using diodes and capacitors, A. W. Holt. Proc. Assoc. Computing Machinery, p. 133 (Assoc. for Computing Machinery, New York,

N. Y. ) (1952). 393. An extension of Gauss' transformation for improving the condition of systems of linear equations, G. E. Forsythe and T. S. Motzkin. Math. Tables and Other Aids to Computation

6, No. 37, 9 (1952). 394. An integral equation approach to the prob- lem of wave propagation over an irregular surface, G. A. Hufford. Quart. Appl. Math. 9, No. 4, 391 (1952).

85
395. An optical model for nucleon- nuclei

scattering, R. E. LeLevier and D. S. Saxon. Phys. Rev. 87, 40 (1952). 396. An U-H-F moon relay, P. G. Sulzer,

G. F. Montgomery, and I. H. Gerks. Proc. IRE 40, 361 (1952). 397. Analysis of goniophotometric reflection curves, I. Nimeroff. Condensation, J. Opt. Soc. Am. 42, 579 (1952). 398. Automatic counting machine, H. M.

Joseph and C. Stansbury. Elect. Mfg. 49, No. 3, 100 (1952). 399. Automotive research at the National Bureau of Standards, F. L. Howard. NADA Mag.

24, No. 3, 118 (1952). 400. Average radio- ray refraction in the lower atmosphere, M. Schulkin. Proc. IRE 40, 554

(1952). 401. Bergmans integraloperator erster Art und Riemannsche Funktion, P. Henrici. Z. Angew.

Math, u Phys. (Basel, Switzerland) 3, 228

(1952). 402. Bonding of plastic teeth to heat cured

denture base resins, I. C. Schoonover, T. E. Fischer, A. F. Serio, and W. T. Sweeney.

J. Am. Dental Assoc. 44, 285 (1952). 403. Boolean geometry. 1. L. M. Blumenthal. Rend. Circ. Mat. Palermo H, No. 1, 1 (1952). 404. Boundary value problems for multiply con- nected domains, F. L. Alt. Proc. Assoc. Computing Machinery, Jointly Sponsored by the Assoc. for Computing Machinery and the Mellon Institute, Pittsburgh, Pennsylvania, May

2-3, 1952, p. 19 3 (Assoc. for Computing

Machinery, New York, N. Y. ) (1952). 405. Bounds for the greatest latent root of a

positive matrix, A. M. Ostrowski. J. London

Math. Soc. (London, England) 27, Pt. 2, No.

106, 253 (1952). 406. Unas signed.

407. Calibration of commercial field- strength meters, C. C. Cook. Tele-Tech. 11, No. 10, 44 (1952). 408. Carbon black differentiation by electrical resistance of vulcanizates, J. E. McKinney

and F. L. Roth. Ind. Eng. Chem. 44, 159

(1952). 409. Unas signed.

410. Chart speeds design of feedback amplifiers, N. C. Hekimian. Electronics 25, No.

9, 153 (1952). 411. Chebyshev polynomials in the solution of large-scale linear systems, C. Lanczos.

Proc. Assoc. Computing Machinery, Toronto, Canada, p. 124 (Assoc. for Computing

Machinery, New York, N. Y.).(1952).

412. Classes of matrices and quadratic fields

(II), O. Taussky. J. London Math. Soc. (London, England) 27, Pt. 2, No. 106, 237

(1952). 413. Computer aids to code checking, I. C. Diehm. Proc. Assoc. Computing Machinery,

Toronto, Canada, p. 19 (Assoc. for Computing

Machinery, New York, N. Y. ) (1952). 414. Condition for radiation from a solar plasma, J. Feinstein. Phys. Rev. 85, 145

(1952). 415. Constant- level device for liquids, D. E. Couch and A. Brenner. Anal. Chem. 24, 922

(1952).

416. Construction and use of subroutines for the SEAC, J. Levin. Proc. Assoc. Computing

Machinery, Jointly Sponsored by the Assoc.

for Computing Machinery and the Mellon Insti- tute, Pittsburgh, Pennsylvania, May 2-3, 1952,

p. 173 (Assoc. for Computing Machinery, New

York, N. Y.) (1952). 417. Convergence of a method of solving linear problems, W. Karush. Proc. Am. Math. Soc.

3, No. 6, 839 (1952). 418. Cosmic radio noise intensities in the VHF

band, H. V. Cottony and J. R. Johler. Proc. IRE 40, 1053 (1952). 419. Cracking in masonry caused by expansion

of mortar, J. W. McBurney. Proc. Am. Soc. Testing Materials 52, 1228 (1952). 420. Criteria for the characterization of kaolinite, halloysite, and a related mineral in clays and soils, L. Bramao, J. G. Cady, S. Hendricks, and M. Swerdlow. Soil Sci. 73, No. 4, 273 (1952). 421. Crystallographic investigation of trical- cium phosphate hydrate, A. S. Posner and

S. R. Stephenson. J. Dental Research 3 1

No. 3, 371 (1952). 422. Density, expansivity, and viscosity of molten alkali silicates, L. Shartsis, S. Spin- ner, and W. Capps. J. Am. Ceram. Soc. 35, No. 6, 155 (1952). 423. Dental amalgam: The effect of mechanical

condensation of some physical properties, G. Ryge, G. Dickson, I. C. Schoonover. J. Am.

Dental Assoc. 45, 269 (1952). 424. Design features of a magnetic drum memory for the National Bureau of Standards Western Automatic Computer (SWAC), R. Thorensen. Proc. of the Symp. on Electronic Computers held by the Western Sect, of the Elect. Computers Prof. Group of the IRE,

April 30, May 1-2, 1952 (University of California, Los Angeles, California) II, 1-11:9 (1952). 425. Determination of critical depth in spatially variable flow, G. H. Keulegan. 2nd

Proc. Midwestern Conf. on Fluid Mechanics

March 17-19, 1952, Ohio State University, Engineering and Experiment Station Bui. 149,

p. 67 (1952). 426. Determination of nitrogen and sulfur in

steel, J. J. Furey, W. R. Sayre, and J. L. Hague. Anal. Chem. 24, 199 (1952). 427; Development of VHF field- intensity standards, F. M. Greene and M. Solow. Proc. IRE 40, No. 5, 573 (1952). 428. Diaphragm error and testing rate in the paper bursting test, F. T. Carson and V. Worthington. Tappi 35, No. 12, 539 (1952). 429. Diathermy generators, E. L. Hall. Arch.

Phys. Med. 33, 28 (1952). 430. Diathermy rules and the physician, E. L.

Hall. Arch. Phys. Therapy 33, 163 (1952). 431. Dielectric constant of water vapor, G. Birnbaum and S. D. Chatterjee. J. Appl. Phys.

23, 220 (1952). 432. Distribution of electrical conduction cur- rents in the vicinity of thunderstorms, R. E. Holzer and D. S. Saxon. J. Geophys. Research 57, No. 2, 207 (1952).
433. Editorial on Roentgen ray protection

design, L. S. Taylor. Am. J. Roentgenol. , Radium Therapy Nuclear Med. 68, 972 (1952). 434. Effects of biaxial stretch- forming, B. M.

Axilrod, M. A. Sherman, V. Cohen, and I. Wolock. Modern Plastics 30, 117 (1952). 435. Effects of humidity during fabrication of polyester laminates, J. E. Wier, D. C. Pons,

and B. M. Axilrod. SPE J. 8, No. 9, 8 (1952). 436. Effects of moderate biaxial stretch- forming on tensile and crazing properties of acrylic

plastic glazing, B. M. Axilrod, M. A. Sher- man, V. Cohen, and L Wolock. Natl. Advisory Comm. Aeronaut. Tech. Note 2779

(1952). 437. Electrical noise from instrument cables

subjected to shock and vibration, T. A. Perls.

J. Appl. Phys. 23, No. 6, 674 (1952). 438. Electron interferometer, L. Marton.

Phys. Rev. 85, No. 6, 1057 (1952). 439. Electron microscopy of soil clays and

related materials, E. B. Kinter, A. M. Win- termyer, and M. Swerdlow. Public Roads J. Highway Research 27, No. 5, 89 (1952). 440. Electron-tube curve generator, M. L. Kuder. Electronics 25, No. 3, 118 (1952). 441. Electronic computers aiding management

control, H. D. Huskey and V. R. Huskey. J. Accountancy 93, No. 1, 69 (1952). 442. Emission spectra on autoignited heptaneair mixtures, W. J. Levedahl and H. P. Broida. Anal. Chem. 24, 1776 (1952). 443. Emission spectroscopy, W. F. Meggers.

Anal. Chem. 24, No. 1, 23 (1952). 444. Experimental production of nodular

graphite in cast iron, A. I. Krynitsky and H.

Stern. Foundry 80, No. 3, 106; Pt. 2, 80, No. 4, 98 (1952). 445. Experimental statistics, R. J. Hader and W. J. Youden. Anal. Chem. 24, 120 (1952). 446. Factors affecting the properties of rayon

fabrics, L. H. Jameson, B. L. Whittier, and

H. F. Schiefer. Textile Research J. 22, No. 9, 599 (1952). 447. Fast coincidences with Cerenkov counters,

Z. Bay, M. R. Cleland, and F. McLernon.

Phys. Rev. 87, 901 (1952). 448. Fifty years of electrochemical theory, W. J. Hamer. J. Electrochem. Soc. 99, No.

12, 331C (1952). 449. Fifty years of electrodeposition, W. Blum.

J. Electrochem. Soc. 99, No. 2, 31C (1952). 450. Filters for the infrared region, E. K.

Plyler and J. J. Ball. J. Opt. Soc. Am. 42, 269 (1952). 451. Fluid exchange at the margins of dental restorations, R. J. Nelsen, R. B. Wolcott, and G. C. Paffenbarger. J. Am. Dental Assoc.

44, 288 (1952). 452. Fluorescence of teeth: A means of investi- gating their structure, G. Dickson, A. F.

Forziati, M. E. Lawson, Jr. , and I. C. Schoonover. J. Am. Dental Assoc. 45, 661

(1952). 453. Formulas for numerical differentiation

in the complex plane, H. E. Salzer. J. Math, and Phys. 31, No. 3, 155 (1952). 454. Foundry crucible service life, R. A.

Heindl. Am. Foundryman 22, 40 (1952).

455. Frequency-deviation meter plots drift, N. C. Hekimian. Electronics 25, No. 6, 134 (1952). 456. Frequency standards , W. D. George.

Cathode Press (Machlett Laboratories, Inc. , Stamford, Connecticut) 9, No. 2, 2 (1952). 457. Gapless coverage in air-to-ground communications at frequencies above 50 Mc, K. A. Norton and P. L. Rice, Proc. IRE 40, 470

(1952). 458. Genuine cooperation between manufacturers and weights and measures officials, W. S. Bussey. Scale J. 38, No. 8, 7 (1952). 459. Ground-to-air cochannel interference at 2900 Mc, P. L. Rice, W. V. Mansfield, and

J. W. Herbstreit. IRE Trans. Ant. Prop. AP-6, 1 (1952). 460. Growth and infrared transmission of cesium iodide crystals, E. K. Plyler and

F. P. Phelps. J. Opt. Soc. Am. 42, 432

(1952). 461. Hazards from static electricity, F. L. Hermach. Military Engr. 144, 287 (1952). 462. Heat capacity of potassium and three potassium- sodium alloys between 0° and 800°,

the triple point and heat of fusion of potassium,

T. B. Douglas, A. F. Ball, D. C. Ginnings, and W. D. Davis. J. Am. Chem. Soc. 74, 2472 (1952). 463. High-power square-pulse generator, W. E. Williams, Jr. Electronics 25, No. 10, 144 (1952). 464. Impact strength of some thermosetting

plastics at low temperatures, J. J. Lamb,

D. A. George, H. A. Baker, and L. E.

Sieffert. ASTM Bull. No. 181, 67 (1952). 465. Improved photogrid techniques for deter- mination of strain over short gage lengths,

J. A. Miller. Proc. Soc. Exptl. Stress Anal. Semiann. Rept. 10, 29 (1952). 466. Improvement in gain stability of the super- heterodyne mixer through the application of negative feedback, G. E. Boggs. Proc. IRE

40, No. 2, 202 (1952). 467. Influence coefficients of tapered canti- lever beams computed on SEAC, S. Levy. ASME Paper No. 52- A- 25 (1952). 468. Influence of splitting on the strength of chrome- tanned steer hides, J. R. Kanagy, W. Leser, E. B. Randall, T. Carter, and C. Mann. J. Am. Leather Chemists Assoc. 47, 329 (1952). 469. Instantaneous power spectra, C. H. Page.

J. Appl. Phys. 23, 103 (1952). 470. Internal reflection in the troposphere and

propagation beyond the horizon, T. J. Carroll. IRE Trans. Ant. Prop. AP-2, 9 (1952). 471. International co-operation on standardization of textile testing methods, W. D. Appel.

J. Home Econ. 44, No. 10, 773 (1952). 472. Interpretation of high-frequency C-W

field- intensity records with the aid of simul- taneous pulse data, R. Silberstein. Proc. IRE

40, 974 (1952). 473. Interpretation of tests for resistance to abrasion of textiles, H. F. Schiefer and C. W.

Werntz. Textile Research J. 22, 1 (1952). 474. Kinetics of chain depolymerization, R. Simha and L. A. Wall. J. Phys. Chem. 56, No. 6, 707 (1952).

87
1952

475. Kinetics of OH radicals from flame emission spectra. IV. A study of the hydro- gen-oxygen flame, H. P. Broida and K. E.

Shuler. J. Chem. Phys. 20, 168 (1952). 476. Kinetics of OH radicals from flame emission spectra. V. A study of acetylene- oxygen flame, H. P. Broida and K. E. Shuler.

J. Chem. Phys. 20, 1383 (1952). 477. Manufacture of paper from glass fibers, M. J. O'Leary, B. W. Scribner, J. K. Missimer, and J. J. Erving. Tappi 35, No.

7, 289 (1952). 478. Mass spectrometry, V. H. Dibeler and

J. A. Hippie. Anal. Chem. 24, 27 (1952). 479. Materiales para pisos, P. A. Sigler and

T. H. Boone. Ingenieria Internacional Construccion (McGraw-Hill Book Co. , Inc. , New York, N. Y. ) 40, No. 7, 50 (1952). 480. Measurement of dynamic properties of rubber, R. S. Marvin. Ind. Eng. Chem. 44, 696 (1952). 481. Measurement of the effect of irregular terrain on VHF and UHF directive antenna

patterns, R. S. Kirby, J. M. Taff, and H. S. Moore. IRE Trans. Ant. Prop. AP-3, 167

(1952). 482. Mechanical testing of solid materials, W. Ramberg. Appl. Mech. Rev. 5, 241 (1952). 483. Military field X-ray equipment, H. I. Amory and S. W. Smith. Radiology 59, No. 6, 879 (1952). 484. Minimizing anomalies in reflectance measurements with the Beckman quartz spectrophotometer, H. K. Hammond, HI, and

I. Nimeroff. J. Opt. Soc. Am. 42, 367 (1952). 485. National Bureau of Standards and state weights and measures administration, W. E. Bussey. Scale J. 38, No. 6, 9 (1952). 486. National Bureau of Standards Semicentennial 1901-1951, L. S. Taylor. Am. J. Roentgenol. , Radium Therapy Nuclear Med.

67, 112 (1952). 487. Natural and synthetic rubbers, N. Bekkedahl. Anal. Chem. 24, 279 (1952). 488. New frontiers in business management

control are being established by electronic computers, H. D. Huskey and V. R. Huskey.

J. of Accountancy, 93, 69 (1952). 489. New techniques for electronic miniaturization, R. L. Henry, R. K-F. Seal, and G. Shapiro. Proc. IRE (Sydney, Australia) 13, No. 3, 75 (1952). 490. Note on the displacement pressure method

for measuring the affinity of liquids for solids, N. J. DeLollis. J. Phys. Chem. 56, No. 2, 193 (1952). 491. Nuclear- resonance magnetic field control, H. A. Thomas. Electronics 25, No. 1, 114

(1952). 492. Object- color changes from daylight to in- candescent filament illumination, H. Helson,

D. B. Judd, and M. H. Warren. Ilium. Eng.

47, 221 (1952). 493. Oblique incidence propagation at 300 kc

using the pulse technique, J. M. Watts. J. Geophys. Research 57, 487 (1952). 494. Oil flow in plain journal bearings, S. A. McKee. Trans. Am. Soc. Mech. Engrs. 74, 841 (1952).

495. Unassigned.

496. On analytic characteristic functions, E. Lukacs and O. Szasz. Pacific J. Math. 2, No. 4, 615 (1952). 497. On integration of parabolic equations by

difference methods, F. John. Comm. Pure

and Appl. Math. 5, No. 2, 155 (1952). 498. On lineal entire functions of n complex

variables, T. S. Motzkin and I. J. Schoenberg.

Proc. Am. Math. Soc. 3, No. 4, 517 (1952). 499. On representations of finite groups. T. S. Motzkin and O. Taussky. Koninkl. Nederl. Akademie Van Wetenschappen Proc. (Amster- dam, Holland) Series A, 55, No. 5; Indag. Math. (Amsterdam, Holland) 14, No. 5, 511

(1952). 500. On the Gibbs phenomenon for a class of linear transforms, O. Szasz. Acad. Serve.

Sci. Publ. Inst. Math. 4, 135 (1952). 501. On the nature of the decay of a meteor

trail, J. Feinstein. Proc. Phys. Soc. (London, England) 65, Pt. 9, 741 (1952). 502. On the numerical solution of equations

involving differential operators with constant

coefficients, G. Blanch. Math. Tables and

Other Aids to Computation 6, No. 40, 219

(1952). 503. On the relation between the conductance and the noise power spectrum of certain

electronic streams, J. J. Freeman. J. Appl. Phys. 23, No. 11, 1223 (1952). 504. On the rounding off of difference tables

for linear interpolation, A. M. Ostrowski.

Math. Tables and Other Aids to Computation

6, No. 40, 212 (1952). 505. Optical spectrophotometric analysis of hydrogen-deuterium mixtures in presence of

air. H. P. Broida and G. H. Morgan. Anal. Chem. 24, 799 (1952). 506. Optical systems for increasing the available

intensity from flames, E. K. Plyler and H. J. Kostkowski. J. Opt. Soc. Am. 42, 360 (1952). 507. Pairs of matrices with property L, T. S. Motzkin and O. Taussky. Trans. Am. Math.

Soc. 73, No. 1, 108 (1952). 508. Partial reflections in tropospheric propagation, J. Feinstein. IRE Trans. Ant. Prop. AP-3, 101 (1952). 509. Penetration and diffusion of X-rays: Calculation of spatial distributions by semiasymptotic methods, L. V. Spencer. Phys. Rev. 88, No. 4, 793 (1952). 510. Physical and physico-chemical constants

of leather and collagen, C. E. Weir. J. Soc. Leather Trades' Chemists 36, 155 (1952). 511. Physical properties of electrodeposited metals, I: Nickel, 3: The effect of plating vari- ables on the structure and properties of electro- deposited nickel, V. Zentner, A. Brenner, and

C. W. Jennings. Plating 39, 865 (1952). 512. Plastics, G. M. Kline and R. B. Seymour.

Ind. Eng. Chem. 44, 2339 (195Z). 513. Polarization measurements of low- fre- quency echoes, E. L. Kilpatrick. J. Geophys. Research 57, No. 2, 221 (1952).

88
514. Polyhedral flames with hydrogen and hydrocarbons, H. P. Broida and W. R. Kane.

J. Chem. Phys. 20, No. 6, 1042 (1952). 515. Polymer degradation studies by absorption and mass spectrometry, B. G. Achhammer.

Anal. Chem. 24, No. 12, 1925 (1952). 516. Precise measurements in the infrared spectrum of carbon monoxide, E. K. Plyler, W. S. Benedict, and S. Silverman. J. Chem.

Phys. 20, 175 (1952). 517. Preparation of small quantities of ger- manium tetramethyl, J. H. Lengel and V. H.

Dibeler. J. Am. Chem. Soc. 74, 2683 (1952). 518. Programming for finding the characteristic values of Mathieu's differential equation and the spheroidal wave equation, G. Blanch. Proc. of the Elect. Computer Symp. held by

the Western Section of the Elect. Computers

Prof. Group of the IRE, April 30, May 1-2, 1952 (University of California, Los Angeles,

California) XIV: 1 (1952). 519. Proof testing rubber tires, R. D. Stiehler. Ordnance 36, No. 192, 1018 (1952). 520. Properties of polymethyl alpha- chloroacrylate, M. C. Slone, J. J. Lamb, and F. W.

Reinhart. Modern Plastics 29 , No. 10, 109

(1952). 521. Properties of self-curing denture base

resins, H. J. Caul, J. W. Sanford, and A. F.

Serio. J. Am. Dental Assoc. 44 , 295 (1952). 522. Properties of the Cr +++ ion in the para- magnetic alums at low temperatures, R. P. Hudson. Phys. Rev. 88, No. 3> 570 (1952). 523. Quantitative determination of^ copper in natural rubber, L. T. Milliken. Rubber Age

71, No. 1, 64 (1952). 524. Radio measurement of winds aloft, R. Greenstone. Aeronaut. Dig. 64, No. 2, 56

(1952). 525. Random flight with multiple partial correlations, C. M. Tchen. J. Chem. Phys. 20, No. 2, 214 (1952). 526. Rates of thermal degradation of polystyrene and polyethelene in a vacuum, S. L. Madorsky.

J. Polymer Sci. 9, No. 2, 133 (1952). 527. Refractive indices of cesium bromide, W. S. Rodney and R. J. Spindle r. J. Opt. Soc. Am. 42, 431 (1952). 528. Relations among certain specification properties of building brick and effects of differences in raw materials and methods of forming, J. W. McBurney, J. C. Richmond,

and M. A. Copeland. J. Am. Ceram. Soc. 35, No. 12, 309 (1952). 529. Remarks on some modular identities, M. Newman. Trans. Am. Math. Soc. 73, No. 2, 313 (1952). 530. Unassigned.

531. Report of the committee on atomic

weights of the American Chemical Society, E. Wichers. J. Am. Chem. Soc. 74, 2447

(1952). 532. Panel discussion --Report on the NBS

optical image evaluation symposium, F. E. Washer, D. P. Feder, and R. V. Shack. Reprinted from Photogrammetric Eng. 18, 575

(1952).

533. Resistivity, dielectric constant, and power factor of leather, C. E. Weir. J. Am.

Leather Chemists Assoc. 47, 711 (1952). 534. Rotational temperatures of OH in several flames, H. P. Broida and G. T. Lalos. J. Chem. Phys. 20, No. 9, 1466 (1952). 53 5. Sampling of side upper leather II, C. Mann, J. Mandel, M. N. Steel, and J. R. Kanagy. J. Am. Leather Chemists Assoc.

47, 352 (1952).

53 6. Scattering of electromagnetic energy in a randomly inhomogeneous atmosphere, H.

Staras. J. Appl. Phys. 23, No. 10, 1152

(1952). 537. Scientific measurement and technological progress, H. Odishaw. Ind. Lab. 3, No. 9, 8 (1952). 538. Secondary electrons: average energy loss per ionization, U. Fano. Chapter in Symp. on

Radiobiology, The Basic Aspects of Radiation

Effects on Living Systems (John Wiley & Sons,

Inc., New York, N. Y. ) (1952). 539. Series-resonant high- voltage supply, P. G. Sulzer. Electronics 25, No. 9, 157

(1952). 540. Service range for air-to-ground and air- to-air communications at frequencies above

50 Mc. , R. S. Kirby, J. W. Herbstreit, and

K. A. Norton. Proc. IRE 40, 525 (1952). 541. Service tests of boys' shoes, R. B. Hobbs. Am. Shoemaking Pt. 1. 222, No. 6, 15; Pt. 2. 222, No. 7, 17 (1952). 542. Sigma phase in high- purity 18-10, S. J. Rosenberg and C. R. Irish. Metal Progr. 61, No. 5, 92 (1952). 543. Similarity properties of the two- fluid model of superconductivity, E. Maxwell.

Phys. Rev. 87, No. 6, 1126 (1952). 544. Solar "enhanced radiation" and plasma

oscillations/ H. K. Sen. Phys. Rev. 88, No. 4, 816 (1952). 545. Some general precepts for programmers,

E. C. Yowell. Proc. of the Symp. on Elect. Computers held by the Western Section of the Elect. Computers Prof. Group at the IRE,

April 30, May 1-2, 1952 (University of California, Los Angeles, California) X:l-X:6

(1952). 546. Some methods for evaluating trends in time series of tropospheric radio field strength

data, P. L. Rice. IRE Trans. Ant. Prop. AP-3, 144 (1952). 547. Some observations on the evaporation of water from cellulose, H. Bogaty, K. S. Campbell, and W. D. Appel. Textile Research J. 22, 75 (1952). 548. Some relations among the blocks of symmetrical group divisible designs, W. S. Connor.

Annals of Math. Stat. 23, No. 4, 602 (1952). 549. Sources and identifying symbols of Govern- ment specifications, S. F. Booth. Metal Progr.

62, No. 4, 109 (1952). 550. Spectral lines as frequency standards, H. Lyons. Ann. N. Y. Acad. Sci. 55, Art. 5, 831 (1952).

551. Spectroscopic analysis of deuterium in hydrogen- deuterium mixtures, H. P. Broida

and J. W. Moyer. J. Opt. Soc. Am. 42, 37

(1952). 552. Stable- output oscillator, S. Rubin. Electronics 25, No. 10, 154 (1952).

89
19 553. Statistical aspects of analytical deter- minations, W. J. Youden. The Analyst 77, No. 921, 874 (1952). 554. Sterochemical research, W. R. Brode. Record Chem. Progr. Summer Issue 45 (1952). 555. Stress and strain at onset of crazing of polymethyl methacrylate at various temperatures, M. A. Sherman and B. M. Axilrod.

Natl. Advisory Comm. Aeronaut. Tech. Note

2778 (1952). 556. Stress studies of bulkhead intersections

for welded tankers, W. R. Campbell, L. K.

Irwin, and R. C. Duncan. Welding J. 31, No. 2, 68 (1952). 557. Study of degradation of polystyrene by means of mass spectrometry, B. G. Achhammer, M. J. Reiney, L. A. Wall, and F. W.

Reinhart. J. Polymer Sci. 8, No. 5, 555

(1952). 558. Study of the variation of the physical and chemical properties of chrome-tanned leather and the selection of a sampling location, J. R. Kanagy, C. Mann, and J. Mandel. J. Soc. Leather Trades' Chemists (London, England)

36, 231 (1952). 559. Sufficient conditions for the convergence

of Newton's method in complex Banach spaces, M. L. Stein. Proc. Am. Math. Soc. 3, No. 6, 858 (1952). 560. Superconductivity of the isotopes of tin, E. Maxwell. Phys. Rev, 86, No. 2, 23 5 (1952). 561. Sweep- frequency oblique- incidence ionosphere measurements over a 1,150 km

path, P. G. Sulzer and E. E. Ferguson. Proc. IRE 40, 1124 (1952). 562. Systems of equations, matrices, and

determinants, O. Taussky and J. Todd. Mathematics Mag. 26, No. 1, Sept. p. 9 and

26, No. 2, Dec. p. 71 (1952). 563. Tables for constructing and for computing

the operating characteristics of single sample

plans, J. M. Cameron. Ind. Qual. Control 9, No. 1, Pt. 1, 37 (1952). 564. Temperature prediction'in electronic design, P. J. Selgin and B. K. Hawes. Elec. Mfg. 50, No. 4, 116 (1952). 565. Testing wholesale meters, W. S. Bussey.

Scale J. 38, No. 4, 7 (1952). 566. The admittance of a diode with a retarding

field, J. J. Freeman. J. Appl. Phys. 23, 743 (1952). 567. The backscattering of positrons and

electrons, H. H. Seliger. Phys. Rev. 88, 408

(1952). 568. The construction and operation of a high pressure diffusion cloud chamber, J. M.

Wyckoff. Phys. Rev. 87, 185 (1952). 569. The decay of the Cd115 isomers, R. W.

Hayward, Phys. Rev. 87, 202 (1952). 570. The determination of impedance with a double- slug transformer , R. C. Ellenwood

and E. H. Hurlburt. Proc. IRE 40, 1690

(1952). 571. The differences in the relationship between

ionospheric critical frequencies and sunspot number for different sunspot cycles, S. M.

Ostrow and M. Pokempner. J. Geophys. Research 57, No. 4, 473 (1952).

572. The effect of molding processes on some

properties of denture resins, A. H. Grunewald,

G. C. Paffenbarger, and G. Dickson. J. Am.

Dental Assoc. 44 , 269 (1952). 573. The effect of recent mass measurements

on the faraday, H. Sommer, S. N. Craig, J. I. Hoffman, and J. A. Hippie. Phys. Rev. 85, 740 (1952). 574. The effect of sporadic-E on television reception, E. K. Smith. IRE Trans. Ant. Prop. AP-2, 54 (1952). 575. The electromagnetic field of rotating uniformly magnetized sphere, A. Banos, Jr. and R. K. Golden. J. Appl. Phys. 23, No. 12, 1294 (1952). 576. The emission spectra of nitrogen bombarded by high energy protons, R. J. Shalek, T. W. Bonner, and L. M. Branscomb. Phys. Rev. 85, 739 (1952). 577. The expansion theorem for pseudo- analytic functions, S. Agmon and L. Bers. Proc. Am.

Math. Soc. 3, No. 5, 757 (1952). 578. The infrared emission spectra of OH, CO,

and CO., from 3/x to 5. 5/j. , E. K. Plyler and

J. J. Ball. J. Chem. Phys. 20, 1178 (1952). 579. The interpretation of chemical data, W. J. Youden. Conf. Papers of the 5th Annual Convention of the Am. Soc. for Quality Control, May 23, 1951 (Rochester Institute of Technology, Rochester, N. Y. ) 8, No. 6, 90 (195Z). 580. The ionization potential of the CF3 radical and some fluorocarbon bond energies ob- tained by electron impact, V. H. Dibeler, R. M. Reese, and F. L. Mohler. J. Chem.

Phys. 20, 761 (1952). 581. The isotope effect in superconductivity, E. Maxwell. Phys. Today 5, No. 12, 14

(1952); Phys. Rev. 5, 13 (1952). 582. The kinorama as an evaluator in aviation

lighting, F. C. Breckenridge. Ilium. Eng. 47, 561 (1952). 583. The limiting polarization of magnetoionic waves, J. Feinstein. IRE Trans. Ant. Prop. AP-3, 19 (1952). 584. The magnetic threshold field curve of a superconductor, R. P. Hudson. Phys. Rev.

85, No. 2, 382 (1952). 585. The microwave measurement of variations in atmospheric refractive index, G. Birnbaum, H. E. Bussey, and R. R. Larson. IRE Trans. Ant. Prop. AP-3, 74 (1952). 586. The nature of gradient reflections, J. Feinstein. IRE Trans. Ant. Prop. AP-4, 2

(1952). 587. The necessity for uniformity of test pro- cedures, M. W. Jensen. Scale J. 39, No. 3, 7 (1952). 588. The operating characteristic of the aver- age chart, E. P. King. Ind. Qual. Control 9, No. 3, 30 (1952). 589. The oxidation of cellulose by ozone in small concentrations, H. Bogaty, K. S. Campbell, and W. D. Appel. Textile Research J. 22, 81 (1952). 590. The present status of temperature scales, H. F. Stimson. Science 116, 339 (1952). 591. The probability distribution of the phase of the resultant vector sum of a constant vector

plus a Rayleigh distributed vector, K. A. Norton,

E. L. Schultz, and H. Yarbrough. J. Appl. Phys. 23, No. 1, 137 (1952).

90
592. The refractories industry in some European countries, R. A. Heindl. The Refractories Inst. Tech. Bull. No. 90, p. 1 (1952). 593. The relation between the absorption

spectra and the chemical constitution of dyes, XXV. Phototropism and cis- trans isomerism

in aromatic azo compounds. W. R. Brode,

J. H. Gould, and G. M. Wyman. J. Am.

Chem. Soc. 74, No. 18. 4641 (1952). 594. The reliability of measured values. Part

I. Fundamental concepts, C. Eisenhart. Photogrammetric Eng. 18, No. 3, 542 (1952). 595. The role of partial reflections in tropo- spheric propagation beyond the horizon, J. Feinstein. IRE Trans. Ant. Prop. AP-2, 2 (1952). 596. The stochastic independence of symmetric

and homogeneous linear and quadratic statistics, E. Lukacs. Ann. Math. Stat. 23, No. 3, 442 (1952).

59 7. The sums of dihedral and trihedral angles

in a tetrahedron, J. W. Gaddum. Am. Math. Monthly 59, No. 6, 370 (1952). 598. The use of sub- routines on SEAC for numerical integrations of differential equations and for Gaussian quadrature, P. Rabinowitz. Proc. Assoc. for Computing Machinery,

Toronto, Canada, p. 88 (Assoc. for Computing

Machinery, New York, N. Y. ) (1952). 599. The vapor pressure of He^-He4 mixtures,

R. A. Nelson and W. Band. Phys. Rev. 88, No. 6, 1431 (1952). 600. The variation of intensity of fast cosmicray neutrons with altitude, L. F. Curtiss and

P. S. Gill. Phys. Rev. 85, No. 2, 309 (1952).

601. The variation of the physical and chemical

properties of split and unsplit chrome-tanned

leathers, E. B. Randall, T. J. Carter, T. J. Kilduff, C. Mann, and J. R. Kanagy. J. Am.

Leather Chemists Assoc. 47, 404 (1952).

602. Thermal batteries, R. B. Goodrick and

R. C. Evans. J. Electrochem. Soc. 99, No. 8, 207 (1952). 603. Thermal Rayleigh disk measurements in liquid helium II. , J. R. Pellam and W. B. Hanson. Phys. Rev. 85, No. 2, 216 (1952).

604. Thermodynamic properties of gaseous

difluorodichloromethane (freon-12), J. F. Masi. J. Am. Chem. Soc. 74, 4738' (1952).

605. Total collision cross sections of negative atomic iodine ions in nitrogen and argon, F. L. McCrackin. Phys. Rev. 86, No. 1, 135 (1952). 606. Transmission loss of space waves propagated over irregular terrain, K. A. Norton. IRE Trans. Ant. Prop. AP-3 (1952). 607. Treatment of leather with polyisobutylene, R. Oehler, S. Dahl, and T. J. Kilduff. J. Am.

Leather Chemists Assoc. 47, 642 (1952).

1952

608. Two existence theorems for systems of linear inequalities, L. M. Blumenthal. Pacific

J. Math. 2, No. 4, 523 (1952). 609. Two explicit formulae for the distribution function of the sums of n uniformly distributed independent variables , A. M. Ostrowski. Archiv Der Mathematik (Basel, Switzerland) 3, No. 6, 3 (1952). 610. Ueber den Einfluss der Gewebekonstruktion

auf den Scheuerwider stand, H. F. Schiefer and

C. W. Werntz. Textil- Praxis (Stuttgart, Germany) 57, 1 (19 52). 611. Units and dimensions in physics, C. H. Page. Am. J. Phys. 20, 1 (1952). 612. Use of continued fractions in high- speed

computing, D. Teichroew. Math. Tables and Other Aids to Computation 6, No. 39, 127 (1952). 613. Use of random numbers, F. Proschan.

Ind. Qual. Control 9, No. 1, 32 (1952). 614. Use of subroutines on SWAC, R. S. Lipkis. Proc. Assoc. for Computing Machinery, p. 231

(1952).

615. Using arc-discharge tubes in regulated

low- voltage supplies, G. E. Boggs. FM-TV

Radio Communication Mag. 12, No. 10, 25

(1952).

616. Vapor pressure of benzene above 100° C. , P. Bender, G. T. Furukawa and J. R. Hyndman.

Ind. Eng. Chem. 44, 387 (1952). 617. Variational calculation of scattering cross

sections, E. Gerjuoy and D. S. Saxon. Phys. Rev. 85, No. 5, 939 (1952). 618. Variations of physical and chemical properties within and between vegetable retanned cow

and steer sides, J. R. Kanagy, E. B. Randall,

T. J. Carter, R. A. Kinmonth, and C. Mann.

J. Am. Leather Chemists Assoc. 47, 726

(1952). 619. Versatile core boxes, R. A. Harwell and

J. H. Schaum. Foundry 80, No. 5, 154 (19 52). 620. Very high frequency tropospheric recording measurements of plane and circular polarize d waves in the Great Lakes area, J. S. Hill, G. V. Waldo, and H. Staras. Abstract publish- ed in IRE Trans. Ant. Prop. AP- 1 , 42 (Feb.

1952); entire paper published as FCC Memo.

62838.

621. Viscosities of 0. 25 to 90 percent GR-S

rubber solutions, A. B. Bestul, H. V. Belcher,

F. A. Quinn, Jr. , and C. B. Bryant. J. Phys. Chem. 56, 432 (1952). 622. What use is spectroscopy? W. F. Meggers.

Appl. Spectroscopy 6, No. 4, 6 (1952).

623. World-wide standard frequency broadcast

reception, E. L. Hall. Tele- Tech. 11, No. 6, 46 (1952); Pt. 2. 11, No. 7, 64(1952).

624. Zeros of I (x)J (x)+J (x)I (x), G. Blanch. Math. Tables and Other Aids to Computation 6, No. 37, 58 (1952).

569918 0—61 7 91
625. A comparative survey of spectrophoto- meters in the 210-760 m/x region, W. R. Brode,

J. H. Gould, G. M. Wyman, and J. E. Whitney.

J. Opt. Soc. Am. 43, 862 (1953). 626. A dual- amplitude axial- load fatigue machine, A. E. McPherson. Proc. Soc. Exptl. Stress Anal. 10, 143 (1953).

627. A high- power pulse generator, W. E. Williams, Jr. Radio- Electronic Eng. Section, Radio and TV News 49, 32 (1953). 628. A method of preparing uniform films of bituminous materials, S. H. Greenfield. ASTM

Bull. No. 193, 50 (1953).

629. A note on wave propagation through an in- homogeneous medium, G. A. Hufford. J. Appl. Phys. 24, 268 (1953).

630. A Neumann series for the product of two

Whittaker functions, P. Henrici. Proc. Am.

Math. Soc. 4, 331 (1953). 631. A numerical analyst's fifteen- foot shelf, G. E. Forsythe. Math. Tables and Other Aids

to Computation VII, 211 (1953). 632. A probe tube method for the transfer of threshold standards between audiometer ear- phones, E. L. R. Corliss and M. D. Burkhard.

J. Acoust. Soc. Am. 25, 990 (1953).

633. A relative damping criterion for linear systems, J. F. Koenig. Applications and In-' dustry, No. 9, 291 (1953); also Trans. Am.

Inst. Elec. Engrs. 72, Pt. 2, 291 (1953). 634. A reliable locked- oscillator pulse timer,

P. G. Sulzer. Tele-Tech 12, No. 4, 68 (1953).

63 5. A study of some of the meterological

effects on radio propagation at 96. 3 mc between Richmond, Va. , and Washington, D. C. , D. L. Randall. Bull. Am. Meterol. Soc. 35, 56

(1953).

63 6. A table of Wilson quotients and the third Wilson prime, K. Goldberg. J. London Math.

Soc. 28, pt. H, 252 (1953).

637. A variable length re-entrant cavity for di- electric measurements from 100 to 400 Mc,

J. H. Beardsley. Rev. Sci. Instr. 24, 180

(1953). 638. A VHF and microwave matching termination, R. C. Ellenwood and W. E. Ryan.

Proc. IRE 41, 104 (1953). 639. Absorption in the low- frequency wing of the NIL inversion spectrum, G. Birnbaum and

A. A. Maryott. J. Chem. Phys. 21, 1774

(1953). 640. Accurate radio- frequency microvoltages, M. C. Selby. Elec. Eng. 72, 515 (1953); Am.

Inst. Elec. Engrs. Trans, p. 1 (May 1953

issue); Electronics 6, 158 (1953). 641. Addendum to a guide to tables on punched

cards, G. Blanch and E. C. Yowell. Math.

Tables and Other Aids to Computation VII, 1 (1953). 642. Advancements in dielectrics, 1952, R. C. Powell and J. L. Dalke. Proc. IRE 41, 452

(1953). 643. Alpha- gamma angular correlation in ion- ium (TH230) ) g> m# Temmer and J. M. Wyckoff. Phys. Rev. 92, 913 (1953).

644. American Dental Association specification N. 12 for denture base resin (second revision), A. C. Swaney, G. C. Paffenbarger , H. J. Caul, and W. T. Sweeney. J. Am. Dental Assoc. 46, 54 (1953).

645. ' Amide nitrogen of collagen and hide powder, J. M. Cassel and E. McKenna. J. Am.

Leather Chemists Assoc. 48, 142 (1953). 646. An accurate time- modulated pulse circuit, C. E. Tschiegg and M. Greenspan. Rev. Sci. Instr. 24, 183 (1953). 647. An automatic controller for radiofrequency

induct ion- heating unit, J. J. Theron. Rev. Sci. Instr. 24, 281 (1953). 648. An eleven megacycle interferometer for low pressure gases, M. Greenspan and M. C. Thompson, Jr. J. Acoust. Soc. Am. 25, 92

(1953). 649. An estimate of the density and motion of solar material from observed characteristics

of solar radio outbursts, H. K. Sen. Australian J. Phys. 6, 67 (1953). 650. An improved cuvette densitometer for cardiac output determination by the dye- dilution method, S. R. Gilford, D. E. Gregg, O. W.

Shadle, T. B. Ferguson, and L. A. Marzetta. Rev. Sci. Instr. 24, 696 (1953). 651. An ionosphere recorder for low frequencies, J. C. Blair, J. N. Brown, and J. M.

Watts. J. Geophys. Research 58, 99 (1953). 652. Analyzing straight- line data, F. S. Acton,

J. Chem. Education 30, 128 (1953). 653. Anelasticity of quartz, R. K. Cook and

R. G. Breckenridge. Phys. Rev. 92, No. 6, 1419 (1953). 654. Application of viscosity methods to the study of branching in polysaccharides, M.

Wales, P. A. Marshall, S. Rothman, and

S. G. Weissberg. Ann. N. Y. Acad. Sci. 57, 353 (1953). 655. Applied optics at NBS, I. C. Gardner.

Phys. Today 6, No. 9, 8 (1953). 656. Asymptotic solution of the differential equation of hydrodynamic stability in a domain

containing a transition point, W. Wasow. Ann. Math. 58, 222 (1953). 657. Beta- ray spectrometers, R. W. Hayward.

Chapter in vol. 5 of Advances in Electronics (Academic Press Inc. , New York, N» Y.) (1953). 658. Biaxial stretch- forming of acrylics, I. Wolock, B. M. Axilrod, and M. A. Sherman. Modern Plastics 31, 128 (1953). 659. Calculation of peaked angular distributions from legendre polynomial expansions and an

application to the multiple scattering of charged

particles, L. V. Spencer. Phys. Rev. 90, 146

(1953). 660. Cemented piezoelectric accelerometers,

E. Jones. Rev. Sci. Instr. 24, 1151 (1953).

661. Change in the inversion spectrum of ND3 from resonant to nonresonant absorption, G. Birnbaum and A. A. Maryott. Phys. Rev. 92, 270 (1953). 662. Changes of sign of sums of random variables, P. Erdos and G. A. Hunt. Pacific J. Math. 3, 673 (1953). 663. Characteristics of the magnetic attenuator

at UHF, F. Reggia and R. W. Beatty. Proc. IRE 41, 93 (1953). 664. Chart for TE, , model piston attenuator, C. M. Allred. Electronics 26, 142 (1953); Electronics Buyer's Guide Issue 26, No. 6A, R8 (1953).

92
665. Chemical analyses, surface area, and thermal reactions of natural graphite, and re- fractoriness of the ashes, L. Mackles, R. A. Heindl, and L. E. Mong. J. Am. Ceram. Soc.

36, 266 (1953). 666. Chemical analysis of GR-S by complete

solution procedures. Gross constituents in GR-S containing soap, F. J. Linnig, J. M.

Peterson, D. M. Edwards, and W. L. Acher- man. Anal. Chem. 25, 1511 (1953).

667. Chemical analysis of GR-S by complete

solution procedures. Titration of mineral and

organic acids in toluene- ethanol solution, F. J. Linnig and A. Schneider. Anal. Chem. 25, 1515 (1953). 668. Chemical methods for separating and

determining metals contained in platiniferous materials, R. Gilchrist. Anal. Chem. 25, 1617 (1953). 669. Closure to discussion by Prof. Maxwell

of "Stress and Strain at the Onset of Crazing

of Polymethyl Methacrylate at Various Temperatures" by M. A. Sherman and B. M. Axilrod, B. M. Axilrod. ASTM Bull. No. 194, p. (1953). 670. Colorimetric determination of tetrachloro- hydroquinone, S. Dahl. Anal. Chem. 25, 1724

(1953). 671. Completely continuous normal operator

with property L, I. Kaplansky. Pacific J. Math. 3, 721 (1953). 672. Computational experience in solving

linear programs, A. J. Hoffman, M. Mannos,

D. Sokolowsky, and N. A. Wiegmann. J. Soc.

Ind. Appl. Math. 1, 17 (19 53). 673. Computer memory uses conventional C-R

tubes, A. W. Holt and W. W. Davis. Electron

ics 26, 178 (1953). 674. Confidence and tolerance intervals for the normal distribution, F. Proschan. J. Am.

Stat. Assoc. 48, 550 (1953). 675. Continental maps of four ionospheric

disturbances, R. S. Lawrence. J. Geophys. Research 58, 219 (1953).

676. Control charts may be all right, but--,

F. Proschan. Ind. Qual. Cont. 9, 56 (19 53). 677. Data concerning atomic spectra, W. F. Meggers and C. E. Moore. J. Opt. Soc. Am.

43, 415 (1953). 678. Decay constant in vibrating systems, R.

D. Laughlin. Radio- Electronic Eng. Sect. , Radio and Television News 49 , 1 1 (1953). 679. Deformation twinning in charpy V- notch specimens of ingot iron. G. W. Geil and N. L, Carmete. Welding J. Research Suppl. 32, 273-F (1953). 680. Degradation and range straggling of high- energy radiations, U. Fano. Phys. Rev. 92, 328 (1953). 681. Degradation des polymeres par les rayons

et les neutrons, L. A. Wall and M. Magat.

J. Chim. Phys. 50, 308 (1953). 682. Degradation of polyisobutylenes on shearing in solution, A. B. Bestul and H. V. Belche

J. Appl. Phys. 24, 1011 (1953). 683. Designing electroformed parts, W. H. Metzger and V. A. Lamb. Machine Design 25, 124 (1953).

1953

684. Determination of dynamic stress- strain curves from strain waves in long bars, W. R. Campbell. Proc. Soc. Exptl. Stress Anal. Semiann. Rep. 10, 1 13 (1953). 685. Determination of phosphate by differential spectrophotometry, A. Gee and V. R.

Deitz. Anal. Chem. 25, 1320 (1953). 686. Development of turbulence- measuring

equipment, L. S. Kovasznay. Nat. Advisory Comm. Aeronaut. Tech. Note 2839 (1953). 687. Dilute solution thermodynamic behavior of

flexible chain molecules: polymethyl methacrylate, T. G. Fox and L. Mandelkern. J. Chem. Phys. 21, 187 (1953). 688. Direct and indirect filling resins: a re- view of some physical and chemical properties,

G. C. Paffenbarger, R. J. Nelsen, and W. T. Sweeney. J. Am. Dental Assoc. 47, 516

(1953). 689. Direct filling resins: dimensional changes

resulting from polymerization shrinkage and water sorption, D. L, Smith and I. C. Schoonover. J. Am. Dental Assoc. 46, 540 (1953).

61 690. Direct- indicating recording instruments,

S. R. Gilford. Elec. Mfg. 52, 114 (1953). 691. Durability of boys' shoes, R. B. Hobbs.

J. Home Economics 45, 32 (1953). 692. Dynamic compliance, dynamic modulus,

and equivalent Voight and Maxwell models for polyisobutylene, H. Leaderman and R. S. Marvin. J. Appl. Phys. 24, 812 (1953). 693. Effect of light on coated groundwood

papers, W. K. Wilson and J. L. Harvey.

Tappi 36, 459 (1953). 694. Effect of straining rate on the compressive strength and elastic properties of concrete, D. Watstein. J. Am. Concrete Inst. 24, No. 49-52, 729 (1953).

69 5. Effect of tensile strain at low temperatures

on deformation twinning in ingot iron, G. W.

Geil and N. L. Carwile. J. Metals 5, 213

(1953); Trans. Am. Inst. Mining Met. Engrs.

197, 213 (1953).

69 6. Effect of variation of circuit parameters

on the excitation of spectra by capacitor dis- charges, C. H. Corliss. Spectrochim. Acta

5, 378 (1953). 697. Effectiveness of vacuum investing in the elimination of surface defects in gold castings, H. W. Lyon, G. Dickson, and I. C. Schoonover. J. Am. Dental Assoc. 46, 197 (1953). 698. Effects of atomic radiation on polymers,

L. A. Wall and M. Magat. Modern Plastics

30, 111 (1953). 699. Effects of high degrees of biaxial stretch- forming on crazing and other properties of acrylic plastic glazing, I. Wolock, B. M. Axilrod, and M. A. Sherman. Natl. Advisory Comm. Aeronaut. Research Memo. RM53D14

(1953). 700. Effects of self- absorption of rotational "temperatures" of OH in flames, H. P. Broida.

J. Chem. Phys. 21, 1165 (1953).

r. 701. Effects of vibrational state on rotational

intensity distribution in OH, A. M. Bass and

H. P. Broida. J. Chem. Phys. 21, 173 (1953).

9?
19 702. Electrical indicating instruments used in early Edison central stations, H. B. Brooks.

J. Franklin Inst. 256, 401 (1953). 703. Electrical properties of indium antimonide,

R. G. Breckenridge, W. R. Hosier, and W.

Oshinsky. Phys. Rev. 91, 243 (1953). 704. Electrical properties of titanium dioxide semiconductors, R. G. Breckenridge and W. R. Hosier. Phys. Rev. 91, 793 (1953). 705. Electrodeless metal-halide lamps, C. H.

Corliss, W. R. Bozman, and F. O. Westfall.

J. Opt. Soc. Am. 43, 398 (1953). 706. Electron beam interferometer, L. Marton,

J. A. Simpson, and J. A. Suddeth. Phys. Rev.

90, 490 (1953). 707. Electron interferometry, L. Marton.

Science 118, 470 (1953). 708. Elements of a mathematical theory of probability, J. H. Curtiss. Mathematics Mag. 26, 233 (1953). 709. Eleven- Mev thick target bremsstrahlung,

J. W. Motz, W. Miller, and H. O. Wyckoff. Phys. Rev. 89, 968 (1953). 710. Endurance of helical springs related to properties of the wire, H. C. Burnett and C. L.

Staugaitis. Metal Progr. 64, 77 (19 53). 711. Energy levels in F*8 from alpha- particle reactions in nitrogen, N. P. Heydenburg and

G. M. Temmer. Phys. Rev. 92, 89 (1953). 712. Engineering management in a government

laboratory, J. G. Reid. Proc. Natl. Elec.

Conf. (Am. Inst. Elec. Engrs. ) 8, 734 (1953). 713. Estimating the standard deviation of a nor- mal population, E. P. King. Ind. Quality Control 10, 30 (1953). 714. Evaluation of a new cuvette densitometer

for determination of cardiac output, O. W.

Shadle, T. B. Ferguson, D. E. Gregg, and S. R. Gilford. Circulation Research 1, No.v3, 200 (1953). 715. Evaluation of adhesion of organic coatings by ultracentrifugal and other methods, A. Malloy, W. Soller, and A. G. Roberts. Paint, Oil, and Chem. Rev. 116, No. 18, 14 and 116, No.

19, 26 (1953). Poo 2 , 716. Evaluation of the integral ] Q e

v 'du, M. Abramowitz. J. Math. Phys. 32, 188 (1953). 717. Extension of the second spectrum of zir- conium into the infrared, C. C. Kiess. J. Opt. Soc. Am. 43, 1024 (1953). 718. Factoren, die die Eigenschaften von Reyongeweben beeinfLussen, L. H. Jameson.

Textil- Praxis (Stuttgard, Germany) 8, 769

(1953). 719. Feedback amplifiers with stabilized output impedances, N. C. Hekimian. Tele-Tech 12, 103 (1953). 720. Filter radiometry and some of its applications, R. Stair. J. Opt. Soc. Am. 43, 971

(1953). 721. Fluorescense of teeth reveals structure,

G. Dickson, A. F. Forziati, and M. E. Lawson, Jr. N. Y. J. Dentistry 23, 299 (1953). 722. FM data reduction from magnetic tape re- corders, L. Costrell. Rev. Sci. Instr. 24, 76

(1953). 723. Frequency- deviation meter plots drift, N.

C. Hekimian. Radio and Television News (Ra- dio-Electronic Engineering Section) 50, No. 4, 32 (1953).

724. Gamma- ray attenuation, U. Fano. Part

I, Nucleonics 11, 8 (1953); Part II, Nucleonics

II, 55 (1953). 725. Gamma- ray measurements by the magnetic analysis of Compton electrons, J. W.

Motz, W. Miller, H. O. Wyckoff, H. F. Gib- son and F. S. Kirn. Rev. Sci. Instr. 24, 929

(1953). 726. Geometrical characterization of nuclear

states and the theory of angular correlations, U. Fano. Phys. Rev. 90, 577 (1953). 727. Geographical and height distribution of the gradient of refractive index, B. R. Bean. Proc. IRE 41, 549 (1953). 728. Unassigned.

729. Heat capacity standards for the range 14°

to 122°K, D. C. Ginnings and G. T. Furukawa.

J. Am. Chem. Soc. 75, 522 (1953). 730. High-frequency scatter sounding experi- ments at the National Bureau of Standards, R.

Silberstein. Science 118, 759 (1953). 731. History of optical glass production in the United States, F. W. Glaze. Am. Ceram. Soc.

Bull. 32, 242 (1953). 732. Hydraulic turbine contra- angle handpiece, R. J. Nelsen, C. E. Pelander, and J. W.

Kumpula. J. Am. Dental Assoc. 47, 324

(1953). 733. Hyperfine structure formulas for LS

coupling, R. E. Trees. Phys. Rev. 92, 308

(1953). 734. Impact properties of yarns made from

different fibers, H. F. Schiefer, W. D. Appel,

J. F. Krasny, and G. G. Richey. Textile Res.

J. 23, 489 (1953). 735. Improvement in response of 4-tt gammaionization chambers, C. C. Smith and H. H.

Seliger. Rev. Sci. Instr. 24, 474 (1953).

73 6. Improvements in flame photometric deter- mination of sodium in portland cement, J. J. Diamond and L. Bean. Anal. Chem. 25, 1825

(1953). 737. Improvements in the NBS primary stand- ard of frequency. Philco Techrep. Div. Bui. (Philadelphia, Pa.) 3, No. 1, 11 (1953). 738. Influence coefficients of tapered cantilever beans computed on SEAC, S. Levy. Am. Soc. Testing Materials 20, 1 (19 53). 739. Influence of the ground on the calibration and use of VHF field- intensity meters, F. M.

Greene. Proc. IRE 14, 58 (1953). 740. Influence of variations in rotors, dies, and

rate of shear on Mooney viscosity, G. E. Decker and F. L. Roth. India Rubber World 128, 339 (1953). 741. Information processing in social and in- dustrial research, J. L. McPherson, S. N. Alexander, H. B. Horton, and E. Glaser. Sci. Monthly 76, 100 (1953). 742. Infrared measurements with a cesium

iodide prism, N. Acquista and E. K. Plyler.

J. Opt. Soc. Am. 43, 977 (1953). 743. Infrared multiplets and the solar spectrum,

C. E. Moore. J. Opt. Soc. Am. 43, No. 11, 1014 (1953). 744. Infrared spectrometry with a cesium

iodide prism, E. K. Plyler and N. Acquista.

J. Opt. Soc. Am. 43, 212 (1953).

94
745. Intrinsic viscosity-molecular weight

relationships for dextran, M. Wales, P. A. Marshall, and S. G. Weissberg. J. Polymer

Sci. 10, 229 (1953). 746. Investigation of structural failures of welded ships, M. L. Williams and G. A.

Ellinger. Welding J. 32, 498-s (1953). 747. Ionization and dissociation of methyl silox- anes by electron impact, V. H. Dibeler, F. L. Mohler, and R. M. Reese. J. Chem. Phys. 21, 180 (1953). 748. Isomorphous substitution in enamel apatite, A. S. Posner and S. R. Stephenson. J. Am. Dental Assoc. 46, 257 (1953). 749. Junction transactor circuit applications, P. G. Sulzer. Electronics 26, No. 8, 170

(1953). 750. Large reductions of VHF transmission

loss and fading by the presence of a mountain

obstacle in beyond- line- of- sight paths, F. H. Dickson, J. J. Egli, J. W. Herbstreit, and

G. S. Wickiser. Proc. IRE 41, 967 (1953). 751. Lead storage batteries- - essential to modern transportation, W. J. Hamer. Capital Chemist 3, 7 (1953). 752. Looking ahead in mechanics, W. Ramberg.

J. Wash. Acad. Sci. 43, 241 (1953).

753. Looking into the nucleus, F. Bitter. J. Opt. Soc. Am. 43, 233 (1953). 754. Lossy cable attenuator pads, R. W.

Beatty and C. E. Huber. Rev. Sci. Instr. 24, 1002 (1953). 755. Low- distortion transistor audio oscillator, P. G. Sulzer. Electronics 26, 171 (1953). 756. Magnetic properties below 1 °K, D. de

Klerk. Phys. Today 6, No. 2, 4 (1953). 757. Making one measurement do the work of two, W. J. Youden and W. S. Connor. Chem.

Eng. Progr. 49, 549 (1953).

758. Mass spectrum of gallium vapor, S. Antkiw and V. H. Dibeler. J. Chem. Phys.

21, 1890 (1953). 759. Mathematical services useful in industry, A. S. Cahn, Jr. Proceedings of Symposium on

Industrial Applications of Automatic Computing

Equipment held by the Midwest Research Insti- tute, Kansas City, Mo., January 8, 1953, p. 19 (1953). 760. Measurement of color, gloss, and haze,

H. K. Hammond, III, and G. W. Ingle. Symposium on Plastics Testing, ASTM Spec. Tech.

Publ. No. 132, p. 25 (1953). 761. Measurement of treadwear of commercial

tires, R. D. Stiehler, G. G. Richey, and J. Mandel. Rubber Age 73, 201 (1953). 762. Measuring the stiffness of paper, R. B. Hobbs and V. Worthington. Modern Packaging

26, 127 (1953). 763. Metodi probabilistici per la soluzione nu- merica di alcuni problemi di analisi, W. Wasow.

Rend. Mat. App. V, XI, 33 6-346 (Roma 1952); also issued separately as Publicazioni dell 1 Istituto per le Applicazioni del Calcolo N. 354 (Roma, Italy) (1953). 764. Metric methods in integral and differential geometry, J. W. Gaddum. Am. J. Math. 75, 30 (1953). 765. Microstructure of dental amalgam, D. L. Smith, G. W. Ferguson, and I. C. Schoonover.

J. Am. Dental Assoc. 47, 305 (1953).

766. Microwave absorption spectrum of ND,>

R. G. Nuckolls, L. J. Rueger, and H. Lyons.

Phys. Rev. 89, 1101 (1953). 767. Millimeter wavelength dispersion of water

vapor, G. Birnbaum. J. Chem. Phys. 21, 57

(1953). 768. Minimax theorems, K. Fan. Proc. Natl. Acad. Sci. 39, 42 (1953). 769. Mismatch errors in microwave power measurements, R. W. Beatty and A. C. Mac

Pherson. Proc. IRE 41, 1112 (1953). 770. Modes of vibration of a suspended chain, D. S. Saxon and A. S. Cahn, Jr. Quart. J. Mech. and Appl. Math. 6, Pt. 3, 273 (1953). 771. National Bureau of Standards aircraft

lighting, research, development and testing, U. S. Naval Aviation Electronics Digest, p. 25 (December 1953). (This article is unclassified by action of NavAer 2545 of 23 Mar 1954, although the Digest itself is classified.

)

772. Natural and synthetic rubbers, N. Bekkedahl. Anal. Chem. 25, 54 (19 53). 773. Noise comparator for microwaves, J. J. Freeman. Radio and TV News (Radio- Elec. Eng. Sect.) 49, No. 3, 11 (1953). 774. Normal fluid concentration in liquid heli- um II below 1 °K, D. de Klerk, R. P. Hudson,

and J. R. Pellam. Phys. Rev. 89, 662 (1953). 775. Notation for atomic spectra, W. F. Meggers and C. E. Moore. J. Opt. Soc. Am. 43, 422 (1953). 776. Note on the indentation of heavy leather, R. B. Hobbs. J. Am. Leather Chemists Assoc.

68, 349 (1953). 777. Note on thermal stabilization of austenite

iron- carbon- nickel alloys, S. J. Rosenberg.

Acta Met. 1, 376 (1953). 778. Nuclear magnetic resonance of aligned radioactive nuclei, N. Bloembergen and G. M. Temmer. Phys. Rev. 89, 883 (1953). 779. On a computation of the capacity of a cube, P. Davis and W. F. Cahill. Math.

Tables and Other Aids to Computation VII, 272 (1953). 780. On absolute measurement, N. E. Dorsey

and C. Eisenhart. Sci. Monthly 77, 103 (1953). 781. On over and under relaxation in the theory

of the cyclic single step iteration, A. M.

Ostrowski. Math.Tables and Other Aids to Computation 7, No. 43, 152 (1953). 782. On polya frequency functions. Ill, The

positivity of translation determinants with an

application to the interpolation problem by spline curves, I. J. Schoenberg and A. Whitney. Trans. Am. Math. Soc. 74, 246 (1953). 783. On smoothing operations and their generating functions, I. J. Schoenberg. Bull. Am.

Math. Soc. 59, 199 (1953). 784. On some procedures for tha rejection of suspected data, E. P. King. J. Am. Stat. Assoc. 48, 531 (1953). 785. On the approximation of linear elliptic differential equations by difference equations

with positive coefficients, T. S. Motzkin and W. Wasow. J. Math, and Phys. 31, 253 (1953). 786. On the derivative of a polynomial and Chebyshev approximation, T. S. Motzkin and

J. L. Walsh. Proc. Am. Math. Soc. 4, 76

(1953).

95
787. On the determination of critical micelle

concentrations by a bubble pressure method,

L. M. Kushner and W. D. Hubbard, J. Phys. Chem. 57, 898 (1953). 788. On the exact evaluation of the variances and covariances of order statistics in samples from the extreme- value distribution, J. Lieblein. Ann. Math. Stat. 24, No. 2, 282 (1953). 789. On the solution of the differential equation occurring in the problem of heat convection in laminar flow through a tube, M. Abramowitz.

J. Math, and Phys. 32, 184 (1953). 790. On the zeros of polynomials and the de- gree of linear systems, J. F. Koenig. J. Appl. Phys. 24, 476 (1953). 791. Pairs of matrices with property L, T. S. Motzkin and O. Taussky. Proc. Natl. Acad.

Sci. 39, 961 (1953). 792. Pairs of normal matrices with property

L, N. A. Wiegmann. Proc. Am. Math. Soc.

4, 35 (1953). 793. Penetration and diffusion of hard X-rays:

Polarization effects, L. V. Spencer and C.

Wolff. Phys. Rev. 90, 510 (1953). 794. Permeability and some other properties

of a variety of refractory materials, G. B. Massengale, L. E. Mong and R. A. Heindl.

J. Am. Ceram. Soc. 36, 222 (1953).

79 5. Physical measurement and medicine,

A. V. Astin. Med. Ann. Dist. Columbia 22,

639 (1953). 796. Plastic electrets, H. H. Wieder and S. Kaufman. J. Appl. Phys. 24, 156 (1953). 797. Plastic electrets and their applications, H. H. Wieder and S. Kaufman. Elec. Eng.

72, 511 (1953). 798. Poisson's ratio of aircraft sheet materials

for large strains, S. Goodman and S. B. Russell. Proc. First Midwestern Conf. on Solid Mechanics (University of Illinois, Urbana,

Illinois) p. 1 (1953). 799. Precision transistor oscillator, P. G. Sulzer. Radio and TV News (Radio-Elec. Eng.

Sect. ) 49, No. 5, 18 (1953). 800. Preparation of bituminous materials for spinning, L. R. Kleinschmidt. ASTM Bull. No.

193, 53 (1953). 801. Preparation of metallic iron of high purity, G. A. Moore. J. Metals 5, No. 11, 1443

(1953); Trans. Am. Inst. Mining and Metallurgical Engrs. (Mining Branch) 197, 1443 (1953). 802. Processing of two-dimensional patterns by

scanning techniques, L. S. Kovasznay and H. M.

Joseph. Science 118, 475 (1953). 803. Products volatilized from a channel and a furnace black on heating to 1,000°C, S. L. Madorsky, V. E. Hart, and S. Straus. Rubber

Age 84, 238 (1953). 804. Propagation of errors in spectrophotomet- ry colorimetry, I. Nimeroff. J. Opt. Soc. Am.

43, 531 (1953). 805. Pulp and paper, R. B. Hobbs and W. K.

Wilson. Chem. Eng. News 31, 40 (1953). 806. Radiant glass heating panels, P. R. Achenbach. Heating and Ventilating 50, 83 (1953). 807. R. F. micropotentiometers, M. C. Selby. (Radio- Electronic Eng. Sect.) Radio & TV

News 50, No. 4, 5 (1953).

808. Radio wave scattering in tropospheric

propagation, J. W. Herbstreit, K. A. Norton,

P. L. Rice and G. E. Schafer. Convention Record of the IRE, Pt. 2, Antennas and communications, p. 85 (1953). 809. Radiophotoluminescence dosimetry system

of the U. S. Navy, J. H. Schulman, W. Shurcliff, R. J. Ginther, and F. H. Attix. Nucleonics 11, 52 (1953). 810. Radix table for obtaining hyperbolic and

inverse hyperbolic functions to many places, H. E. Salzer. J. Math, and Phys. 32, 197

(1953). 811. Rates and activation energies of thermal

degradation of styrene and acrylate polymers in a vacuum, S. L. Madorsky. J. Polymer Sci.

11, 491 (1953). 812. Refractive index of potassium bromide for infrared radiant energy, R. E. Stephens, E. K.

Plyler, W. S. Rodney, and R. J. Spindler. J. Opt. Soc. Am. 43, 110 (1953). 813. Rejection of outlying observations, F. Proschan. Am. J. Phys. 21, 520 (1953). 814. Removal of manganese prior to calcium

and magnesium precipitations, B. L. Ingram

and L. Bean. Anal. Chem. 25, 1217 (1953). 815. Representation of gas properties in terms

of molecular clusters, H. W. Woolley. J. Chem.

Phys. 21, 236 (1953). 816. Rotational and vibrational "temperatures"

of CH in flames at atmospheric pressure, H. P. Broida. J. Chem. Phys. 21, 340 (1953). 817. Rotational intensity distributions of OH and OD in electrodeless discharge through water

vapor, H. P. Broida and W. R. Kane. Phys.

Rev. 89, 1053 (1953). 818. Rotational "temperature" of OH in diluted flames, W. R. Kane and H. P. Broida. J. Chem. Phys. 21, 347 (1953). 819. Scientific teamwork in a Computation

Laboratory, J. H. Curtiss. Teamwork in re- search, edited by G. P. Bush and L. H. Hattery, Chapter 17 (American University Press)

(1953). 820. SEAC, S. Greenwald, R. D. Haueter, and

S. N. Alexander. Proc. IRE 41, 1300 (1953). 821. Second sound propagation in liquid helium

II, J. R. Pellam. Phys. Today 6, 4 (1953). 822. " Second sound velocity measurements below

1 °K, D. de Klerk, R. P. Hudson, and J. R. Pellam. Phys. Rev. 89, 326 (1953). 823. Semiconducting intermetallic compounds,

R. G. Breckenridge. Phys. Rev. 90, 488

(1953). 824. Sequential decision problems for processes

with continuous time parameter. Testing hy- potheses, A. Dvoretsky, J. Kiefer, and J. Wolfowitz. Ann. Math. Stat. 24, No. 2, 254

(1953). 825. Sets of three measurements, W. J. Youden. Sci. Monthly 77, 143 (1953). 826. Signal generator system for low output

levels, J. W. Herbstreit. Electronics 26, No.

I, 218 (1953). 827. Silicate cement: method of mixing in a closed container to prevent effects of exposure

to atmosphere, A. H. Grunewald, G. Dickson,

G. C. Paffenbarger, and I. C. Schoonover.

J. Am. Dental Assoc. 46, 184 (1953).

96
1-9! 828. Singular perturbation methods for nonlinear oscillations, W. Wasow. Proceedings of

a Symposium on Nonlinear Circuit Analysis,

held by the Polytechnic Institute of Brooklyn,

N. Y. P. 75 (1953). 829. Slide rule computes radio refractive index

of air, S. Weintraub. Electronics 26, No. 1, 182 (1953). 830. Solderless electronic assembly with cellu- lar units, P. J. Selgin. Elec. Mfg. 52, 139

(1953). 831. Solving linear algebraic equations can be

interesting, G. E. Forsythe. Bull. Am. Math.

Soc. 59, 299 (1953). 832. Sorption of dextran to collodion membranes,

S. Rothman, A. Schwebel, and S. G. Weissberg.

J. Polymer Sci. 11, 381 (1953). 833. Specification of color- rendering properties

of fluorescent lamps, C. W. Jerome and D. B.

Judd. mum. Eng. 48, 259 (1953). 834. Spectral energy distribution of the Inter- national Commission on Illumination light sources A, B, and C, R. Davis, K. S. Gibson, and G. W. Haupt. Condensation of this paper

appeared in J. Opt. Soc. Am. 43, 172 (1953). 835. Standard samples, E. Wichers. Science

117, 7 (1953). 836. Standards of temperature, R. E. Wilson. Phys. Today 6, 10 (1953). 837. Steric hindrance to coplanarity in o_flUorobenzidines, A. J. Bilbo and G. M. Wyman. J. Am. Chem. Soc. 75, 5312 (1953). 838. Stress and strain at onset of crazing of polymethyl methacrylate at various temperatures, M. A. Sherman and B. M. Axilrod. ASTM Bull. 191, 65 (1953). 839. Stress- solvent crazing of acrylics, B. M.

Axilrod and M. A. Sherman. Modern Plastics

30, 130 (1953). 840. Structural analysis and influence coefficients

for delta wings, S. Levy. J. Aeronaut. Sci. 20, No. 7, 449 (1953). 841. Studies on the polar amino acid content of collagen and related material, J. M. Cassel, E. McKenna, and A. Glime. J. Am. Leather Chemists Assn. 48, 277 (1953). 842. Study of the burst test as applied to military upper leathers, E. B. Randall, C. Mann, J. R. Kanagy, and J. Mandel. J. Am. Leather Chemists Assoc. 48, 84 (1953). 843. Survey of experimental heat capacities of ten technically important gases, J. F. Masi.

Trans. Am. Soc. Mech. Engrs. , p. 1067

(1953). 844. Symposium on Recent Developments in the Evaluation of Natural Rubber— Introduction, N. Bekkedahl. ASTM Spec. Tech. Pub. No.

136, p. 1 (1953). 845. Synthetic textiles, W. D. Appel. Americana Annual 1, 697 (1953). 846. Synthetically bonded molding sand, M. T. Zemantowsky. Am. Foundryman 23, 57 (1953). 847. Systematic calculations of gamma- ray penetration, H. Goldstein, J. E. Wilkins, Jr., and

L. V. Spencer. Phys. Rev. 89, 1150 (1953). 848. Teflon insert makes needle valve vacuum

tight, L. J. Rueger. Rev. Sci. Instr. 24, 551

(1953).

849. Temperature coefficients of non- Newtonian

viscosity at fixed shearing stress and at fixed rate of shear, A. B. Bestul and H. V. Belcher.

J. Appl. Phys. 24, 696 (1953). 850. Tests for colorfastness of textiles under

consideration in the International Organization

for Standardization, W. D. Appel. Am. Dyestuff Reptr. 42, 871 (1953). 851. The action of boron in enhancing the hardenability of steel, T. G. Digges. SAE J. 61, 24

(1953). 852. The chain block design, W. J. Youden and W. S. Connor. Biometrics 9, 127 (1953). 853. The coefficients of certain infinite products, M. Newman. Proc. Am. Math. Soc. 4, 435

(1953). 854. The color stability of direct filling resins, H. J. Caul and I. C. Schoonover. J. Am.

Dental Assoc. 47, 448 (1953). 855. The constants in the equation for atmospheric refractive index at radio frequencies, E. K. Smith and S. Weintraub. Proc. IRE 41, 1035 (1953). 856. The convergence of numerical iteration, H. A. Antosiewicz and J. M. Hammersley. Am. Math. Monthly 60, 604 (1953). 857. The double description method, T. S. Motzkin, H. Raiffa, G. L. Thompson, R. M.

Thrall. Contributions to the theory of games

H, Edited by H. W. Kuhn and A. W. Tucker, Annals of Math. Study 28, Chapter 3 (Princeton, N. J.) (1953). 858. The effect of illuminance of a lens inter- posed between the source and the illuminated

surface, R. E. Stephens. J. Opt. Soc. Am.

43, 704 (1953). 859. The effect of sporadic-E on television reception, E. K. Smith. J. Radio- Electronics

24, No. 6, 54 (1953). 860. The emission spectrum of OH from 1.4 to

I. 7^., W. S. Benedict, E. K. Plyler, and C. J. Humphreys. J. Chem. Phys. 21, 398 (1953). 861. The freezing of water in pipes and vessels, R. S. Dill. Heating and Ventilating 50, 9 6 (1953). 862. The graduation of precise circles, B. L. Page. Surveying and Mapping 13, 149 (1953). 863. The half- life of I

131

, H. H. Seliger, L. Cavallo, and S. V. Culpepper. Phys. Rev. 90, 443 (1953). 864. The identification of solar lines, C. E. Moore. Chapter 4 of The Sun, Volume I of the Solar System, p. 186 (Edited by G. P. Kuiper, The University of Chicago Press, Chicago,

Illinois) (1953). 865. The limiting thickness of an electrolyzed gas film capable of sustaining a given negative pressure, L. J. Briggs. J. Chem. Phys. 21, 779 (1953). 866. The luminous reaction between carbon monoxide and atomic oxygen, H. P. Broida and

A. G. Gaydon. Trans. Faraday Soc. 49, 1190

(1953). 867. The measurement of gas temperatures by immersion- type instruments, E. F. Fiock and

A. I. Dahl. J. Am. Rocket Soc. 23, 155 (1953).

97
868. The mechanism of formation of OH, CH,

and HCO in flame spectra, using deuterium as tracer, H. P. Broida and A. G. Gaydon. Proc.

Roy. Soc. (London, England) 218, 60 (19 53). 869. The melting transition of polymethylene,

L. Mandelkern, M. Hellmann, D. W. Brown,

D. E. Roberts, and F. A. Quinn, Jr. J. Am.

Chem. Soc. 75, 4093 (1953). 870. The monthly refractive gradient for the United States and its application to predicting

the geographical and annual trend of VHF trans- mission loss, B. R. Bean and F. M. Meaney.

Proc. Conf. Radio Meteorol. Supplement III- 2, (The University of Texas, Austin, Texas) (1953). 871. Unassigned.

872. The NBS primary frequency standard, J. H. Shoaf. Radio and TV News 49, No. 1, 10

(1953). 873. Unassigned.

874. The non- Maxwellian distribution in a shock

front and the anomaly of the chromospheric

temperature, H. K. Sen. Phys. Rev. 92, 861

(1953). 875. The nuclear moments of technetium- 99 , K. G. Kessler and R. E. Trees. Phys. Rev.

92, 303 (1953). 876. The number of farthest points, T. S. Motzkin, E. G. Straus, and F. A. Valentine.

Pacific J. Math. 3, 221 (1953). 877. The piston gage as a precise measuring

instrument, D. P. Johnson and D. H. Newhall. Trans. Am. Soc. Mech. Engrs. 75, 301 (1953). 878. Unassigned.

879. The preparation of two fluorinated p-diha- lobenzenes, M. Hellmann and A. J. Bilbo, J. Am. Chem. Soc. 75, 4590 (1953). 880. The principles of experimental design, W. J. Youden. Appeared as a chapter in "Research Operations in Industry," (Papers deliver- ed at the Third Annual Conference on Industrial Research, June 1953), P. 317 (Kings Crown

Press, Columbia University, New York, N. Y.

(1953). 881. The relation between the absorption spectra and the chemical constitution of dyes. XXVI.

Effect of solvent and of temperature on the cis- trans isomerization of azo dyes, W. R. Brode,

J. H. Gould, and G. M. Wyman. J. Am. Chem.

Soc. 75, 1856 (1953). 882. The sieve problem for all-purpose computers, D. H. Lehmer. Math. Tables and

Other Aids to Computation 7, 6 (19 53). 883. The stiffness of paper, F. T. Carson and

V. Worthington. Tappi 36, 36 (1953). 884. The structure of turbulence in fully devel- oped pipe flow, J. Laufer. Nat. Advisory Comm. Aeronaut. Tech. Note 2954 (1953). 885. The SWAC- design features and operating

experience, H. D. Huskey, R. Thorensen, B.

F. Ambrosio, and E. C. Yowell. Proc. IRE

41, 1294 (1953). 886. The testing of electrical instruments,

F. L. Hermach. Proc. Instr. Soc. Am. 8, 18 (1953). 887. The use of zonal constants in the calculation of beam flux, T. H. Projector. Ilium. Eng. 48, 189 (1953). 888. The Va fundamental of C,F, , E. K. Plyler and D. E. Mann. J. Chem. Phys. 21, 1116 (1953).

889. The vapor pressures of the deutero- methanes, G. T. Armstrong, F. G. Brick- wedde, and R. B. Scott. J. Chem. Phys. 21, 1297 (1953). 890. The variation of the spectrum of a normal

matrix, A. J. Hoffman and H. Wielandt. Duke

Math. J. 20, 37 (1953). 891. The vibration- rotation spectrum of D? 0, W. S. Benedict, N. Gailar, and E. K. Plyler.

J. Chem. Phys. 21, 1301 (1953). 892. The vibration- rotation spectrum of HDO,

W. S. Benedict, N. Gailar, and E. K. Plyler.

J. Chem. Phys. 21, 1302 (1953). 893. The vibrational spectrum of chlorotri- fluoroethylene, D. E. Mann, N. Acquista, and

E. K. Plyler. J. Chem. Phys. 21, 1949 (1953). 894. The year 1952 in review, G. M. Kline. Modern Plastics 30, 111 (1953). 895. Thermal Rayleigh disk measurements in He -He mixtures, B. Weinstock and J. R. Pellam. Phys. Rev. 89, 521 (1953). 896. Thermoelectric power in germanium

single crystals, H. P. R. Frederikse. Phys.

Rev. 91, 491 (1953). 897. Thermoelectric power of germanium be- low room temperature, H. P. R. Frederikse.

Phys. Rev. 92, 248 (1953). 898. Thickness and compressibility of fabrics, H. F. Schiefer. ASTM Bull. No. 192, TP138,

48 (1953). 899. Transistor band spotter, P. G. Sulzer. Radio and Television News, Radio- Electronic Engineering Section, 49, No. 6, 52 (1953). 900. Transistor frequency standard, P. G.

Sulzer. Electronics 36, 206 (1953). 901. Transmission loss in radio propagation, K. A. Norton. Proc. IRE 41, 146 (1953). 902. UHF magnetic attenuator, F. Reggia. Radio- Electronic Eng. Sect. Radio and TV

News 49, No. 4, 12 (1953). 903. Underearth crystal resonators, T. A.

Pendleton. Proc. IRE 41, 1612 (1953). 904. Versatile goniometer for projection photometry, T. H. Projector. Ilium. Eng. 48, 192 (1953). 905. Unassigned.

906. Vibration- rotation spectrum of HDO,

E. K. Plyler, W. S. Benedict and N. Gailar.

J. Chem. Phys. 21, 1302 (1953). 907. Viscosity and electrical resistivity of molten alkali borates, L. Shartsis, W. Capps, and S. Spinner. J. Am. Ceram. Soc. 36, 319

(1953). 908. Voltage breakdown tester, W. E. Williams,

Jr. Rev. Sci. Instr. 24, 458 (1953). 909. Vulcanization characteristics of natural rubber, R. D. Stiehler and F. L. Roth. Symp.

on Recent Developments in the Evaluation of Natural Rubber, 19 52 ; ASTM Spec. Tech. Pub. No. 136, p. 50 (1953); India Rubber World 127, 783 (1953) Rubber Chem. Tech. 26, 593 (1953). 910. Wave propagation in an anisotropic, in- homogeneous medium, J. Feinstein. J. Geophys. Research 58, 223 (1953). 911. Wide-range calibrator for vibration pickups, W. A. Yates and M. Davidson. Electronics 26, 183 (1953). 912. Zeros of the derivative of Bessel functions

of fractional order, H. E. Salzer. Math. Tables and Other Aids to Computation VII, 69 (1953).
913. A basic method of determining the dynamic

characteristics of accelerometers by rotation, W. A. Wildhack and R. O. Smith. J. Instr. Soc. Am. 1, No. 12, paper No. 54 (1954). 914. A broadband, low-level, error- voltage

detector, M. L. Kuder. Rev. Sci. Instr. 25, No. 5, 464 (1954). 915. A comparison of amplitude and angle modulation for narrow-band communication of binary- coded messages in fluctuation noise, G. F. Montgomery. Proc. IRE 42, 447 (1954). 916. A comparison of X-ray standards, H. O. Wyckoff, G. H. Aston, and E. E. Smith.

British J. Radiol. 27, No. 318, 325 (1954). 917. A flex tension test for leather, T. J. Carter and J. R. Kanagy. J. Am. Leather Chemists Assoc. 49, 23 (1954). 918. A graphical interpretation of a three- components theory of chromatic adaptation in terms

of the CLE chromaticity diagram, G. Wyszecki.

J. Opt. Soc. Am. 44, 787 (1954). 919. A high vacuum seal- off valve, R. J. Richards. Rev. Sci. Instr. 25, 520 (1954). 920. A method for the study of the circulation

in the dog using a mechanical left ventricle,

J. C. Rose, H. P. Broida, C. A. Hufnagel,

J. F. Gillespie, P. J. Rabile, and E. D. Freis.

J. Appl. Physiol. 7, 580 (1954). 921. A multiple-purpose orthonormalizing code and its uses, P. Davis and P. Rabinowitz. J. Assoc. Computing Machinery 1, No. 4, 183 (1954). 922. A new method of analyzing extreme- value

data, J. Lieblein. Natl. Advisory Comm.

Aeronaut. Tech. Note 3053 (1954). 923. A note on partially balanced designs, M. Zelen. Ann. Math. Stat. 25, No. 3, 599

(1954). 924. A note on sweep- frequency backscatter

observations, R. Silberstein. J. Geophys. Research 59, 138 (1954). 925. A note on the oxyquinolate determination

of magnesium oxide in cement, L. Bean and

N. J. Tucker. ASTM Bull. (TP224) No. 201,

62 (1954). 926. A plan for studying the accuracy and precision of an analytical procedure , F. J. Linnig,

J. Mandel, and J. M. Peterson. Anal. Chem.

26, No. 7, 1102 (1954). 927. A pound of gas? H. S. Bean. Gas 30, No. 12, 31 (1954). 928. A property of the normal distribution, E. Lukacs and E. P. King. Ann. Math. Stat. 25, No. 2, 389 (1954). 929. A pulsed magnetic extractor for removing

the electron beam from a betatron, R. S. Foote

and B. Petree, Rev. Sci. Instr. 25, 694 (1954). 930. A regular rhombohedral lattice sampling

of Munsell renotation space, G. Wyszecki. J. Opt. Soc. Am. 44, 725 (1954). 931. A remark on the smoothing problem, H. A. Antosiewicz and A. J. Hoffman. Management

Sci. 1, No. 1, 92 (1954). 932. A representation for solutions of analytic systems of linear differential equations, H. A. Antosiewicz and M." Abramowitz. J. Wash.

Acad. Sci. 44, No. 12, 382 (1954). 933. A revised analysis of the solar spectrum from 2990 to 2635A, N. L. Wilson, R. Tousey,

J. D. Purcell, F. S. Johnson, and C. E. Moore.

Astrophys. J. 119, No. 3, 590 (1954).

934. A similarity principle in the backscattering of'V'-rays, U. Fano. Radiation Research 1, No. 5, 495 (1954). 935. A stable voltage controlled logarithmic

attenuator, G. E. Boggs. Proc. IRE 42, 696

(1954). 936. A Stokes-parameter technique for the treatment of polarization in quantum mechanics,

U. Fano. Phys. Rev. 93, 121 (1954). 937. A study of some operations involved in cement analysis, L. Bean and E. J. Hackney. ASTM Bull. No. 197, 43 (1954). 938. A technique for sweep frequency polarization measurements at low frequencies, E. L.

Kilpatrick. J. Geophys. Research 59, 345

(1954). 939. A time- proportional electronic thermostat, F. A. Ransom. Cont. Eng. 1, 85 (1954). 940. Acceptance sampling of electroplated

articles, J. M. Cameron and F. Ogburn.

Plating 41, No. 1, 43 (1954). 941. Acoustic impedance of a right circular

cylindrical enclosure, F. Biagi and R. K. Cook.

J. Acoust. Soc. Am. 26, No. 4, 506 (1954). 942. Adiabatic apparatus for the study of self- heating of poorly conducting materials , W. H. Raskin and A. F. Robertson. Rev. Sci. Instr. 25, 541 (1954). 943. Advancements in dielectrics, 1953, R. C. Powell and J. L. Dalke. Proc. IRE 42, 705

(1954). 944. American dielectric standards, R. C. Powell. Elec. J. 153, 1779 (1954). 945. American standard building code require- ments for masonry, J. W. McBurney. Mag. of Standards 25, No. 11, 358 (1954). 946. An acoustic method for the measurement

of vibration amplitudes, W. Koidan. J. Acoust.

Soc. Am. 26, 428 (1954). 947. An electron interferometer, L. Marton,

J. A. Simpson, and J. A. Suddeth. Rev. Sci. Instr. 25, No. 11, 1099 (1954). 948. An embedding theorem for balanced in- complete block designs, M. Hall, Jr. , and W. S. Connor. Can. J. Math. 6, No. 1, 35

(1954). 949. Unas signed. 950. An improved optical test for spherical

aberration, J. B. Saunders. Letter to Editor.

J. Opt. Soc. Am. 44, No. 8, 664 (1954). 951. An integrating and differentiating bar-magnet velocity meter for use in ballistocardio- graphy, T. A. Perls and C. W. Kissinger. Rev.

Sci. Instr. 25, No. 10, 983 (1954). 952. An isoperimetric inequality for closed curves convex in even- dimensional Euclidean

spaces, I. J. Schoenberg. Acta Math. (Uppsala, Sweden) 91, 143 (1954). 953. Analysis for some partially balanced in- complete block designs having a missing block, M. Zelen. Biometrics 10, No. 2, 273 (1954). 954. Analysis of brittle behavior in ship plates, M. L. Williams. ASTM Spec. Tech. Publ. No.

158, 11 (1954). 955. Application of variational methods to inter- mediate and high energy scattering, E. Gerjuoy

and D. S. Saxon. Phys. Rev. 94, 478 (1954).

99
19! 9 56. Approximations in linear viscoelasticity theory: Delta- function approximations , H. Leaderman. J. Appl. Phys. 25, 294 (1954). 957. Asymptotic lower bounds for the frequencies of certain polygonal membranes, G. E. Forsythe. Pacific J. Math. 4, No. 2, 467

(1954). 958. Atoms and ions in the sun, C. E. Moore.

Science 119, No. 3093, 449 (1954). 959. Backscattering of the cobalt- 60 gamma

rays from infinite media, E. V. Hayward and

J. H. Hubbell. J. Appl. Phys. 25, 506 (1954). 960. Becker value of manila rope by photoelectric reflectometry, S. B. Newman, H. K. Hammond, IU, and H. F. Riddell. ASTM Bull. No. 199, 84 (1954). 961. Betatron X- rays : How much concrete for shielding? F. S. Kirn and R. J. Kennedy.

Nucleonics 12, 44 (1954). 962. Bias supplied for direct- coupled circuits,

J. Reaves. Electronics 27, No. 8, 172 (1954). 963. Building and using dielectric amplifiers,

A. Silverstein. Electronics 27, 150 (1954). 964. Cellular concretes. Part 1. Composition

and methods of preparation, R. C. Valore, Jr.

J. Am. Concrete Inst. 25, 773 (1954). Part 2. Physical properties. J. Am. Concrete Inst. 25, 817 (1954). 965. Certain fourier transforms of distribution:

II, E. Lukacs and O. Szasz. Can. J. Math. 6, 186 (1954). 966. Chain block designs with two-way elimination of heterogeneity, J. Mandel. Biometrics

10, 251 (1954). 967. Characteristic roots of quaternion matrices,

O. Taussky. Archiv Der Mathematik (Wurzburg, Germany) 5, 99 (1954).

9 68. Characteristics of turbulence in a boundary

layer with zero pressure gradient, P. S. Klebanoff. Natl. Advisory Comm. Aeronaut. Tech.

Note 3178 (1954). 969. Chemical education in Switzerland, R. G. Bates. The Capital Chemist 4, *No. 5, 150

(1954). 970. Color and turbidity of sugar products, B. W. Liggett and V. R. Deitz. Advances in Carbohydrate Chem. 9, 247 (1954). 971. Combined translational and relaxational dispersion of sound in gases, M. Greenspan.

J. Acoust. Soc. Am. 26, 70 (1954). 972. Comparative 100 mc measurements at distances far beyond the radio horizon, A. P. Barsis. IRE Conv. Record, March 22-25,

1954, [2], Pt. 1, p. 98(1954).

973. Comparison of sodium hydroxide and sul- furic acid methods for analysis of wool admixed

with cotton and viscose rayon, E. Horowitz and

J. Mandel. Am. Dye stuff Reprt. 43, No. 19, 613 (1954). 974. Comparison of theories and experiments

for the hydraulic dam-break wave, R. F. Dressier. Proc. Intern. Union Geodesy and Geophys. (Rome, Italy) 3, 319 (1954). 975. Complex biorthogonality for certain sets

of polynomials, P. Davis and H. Pollak. Duke

Math. J. 21, No. 4, 653 (1954). 976. Composition of apparent shearing forces during shear degradation of polymers, A. B.

Bestul. J. Appl. Phys. 25, 1069 (19 54).

977. Continuous measurement of atmospherica

ozone by an automatic photoelectric method, R.

Stair, T. C. Bagg, and R. G. Johnston. Proc.

Joint Army- Navy Air Force Conf. on Elasto- mer Research and Devel. , January 12- 13, 1954

(Washington, D. C), Natl. Acad. Sci. -Natl. Research Council Publ. 370, p. 75 (1954). , 978. Contractibility and convexity, H. W. Kuhn.

Proc. Am. Math. Soc. 5, No. 5, 777 (1954). 979. Corrosion of aluminum alloys by exhaust

gases, F. M. Reinhart. Corrosion 10, No.

12, 421 (1954). 980. Coulomb wave functions in the transition region, M. Abramowitz and H. A. Antosiewicz. Phys. Rev. 96, No. 1, 75 (1954). 981. Critical field phenomena in an isotropic paramagnetic crystal, E. Ambler and R. P. Hudson. Phys. Rev. 96, No. 4, 907 (1954). 982. Cross sections for charge transfer col- lisions of low energy ions in N? and 0?

, R. F. Potter. J. Chem. Phys. 22, 9^74 (1954). 983. Crystallization in butadiene- styrene co- polymers, L. A. Wood. J. Appl. Phys. 25, No. 7, 851 (1954). 984. Current problems in refining with bone

char, V. R. Deitz. Sugar J. 49, 44 (1954). 985. Depolymerization of polymethylene and

polyethylene, L. A. Wall, S. L. Madorsky,

D. W. Brown, S. Straus, and R. Simha. J. Am. Chem. Soc. 76, 3430 (1954). 986. Deterioration during storage of alginate hydrocolloidal dental impression material, K. R.

Pfeiffer, J. L. Harvey, and G. M. Brauer.

U. S. Armed Forces Med. J. 5, No. 9, 315

(1954). 987. Determination of inorganic constituents in sucrose solutions, A. Gee, L. P. Domingues,

and V. R. Deitz. Anal. Chem. 26, 1487 (1954). 988. Determination of loads in the presence of thermal stresses, S. Levy. J. Aeronaut. Sci. 21, No. 10, 659 (1954). 989. Determination of viscosity of exhaust- gas mixtures at elevated temperatures, J. C. West- moreland. Natl. Advisory Comm. Aeronaut. Tech. Note 3180 (1954). 990. Determination of water content in Freon12 circulating in a refrigeration system, A. W.

Diniak, E. E. Hughes, and M. Fujii. Refrig. Eng. 62, No. 2, 56 (1954). 991. Die bestimmung thermodynamischer acid- itatskonstanten, R. G. Bates and G. Schwarzenbach. Hevl. Chim. Acta (Basel, Switzerland)

37, 1069 (1954). 992. Dielectric measurements up to 500°C, symposium on temperature stability of electrical insulating materials, A. H. Scott, P. Ehrlich, and J. F. Richardson. Proc. Am. Soc. Testing Materials Spec. Tech. Publ. No. 161

(1954). 993. Differential cross- section measurement

for 1-Mev bremsstrahlung, J. W. Motz and W.

Miller. Phys. Rev. 96, 544L (1954). 994. Dimethylphosphinoborine trimer: mass

spectra and thermal decomposition, R. E.

Florin, L. A. Wall, F. L. Mohler, and E.

Quinn. J. Am. Chem. Soc. 76, 3344 (1954). 995. Dose measurements in water using scintil- lation and ionization detectors, B. Zendle and

H. W. Koch. Radiation Research 1, No. 6, 568A (1954).

100
19! 996. Drain casting of a high-grade magnesium

oxide support used in an experimental vacuum

tube, W. G. Haliday and J. R. Nail. Rev. Sci.

Instr. 25, No. 12, 1225 (1954). 997. Effect of chemical combination of the characteristic energy loss of electrons, L. B. Leder and L. Marton. Phys. Rev. 95, 1345

(1954). 998. Effect of exposure to soils on the properties of asbestos- cement pipes, M. Romanoff

and I. A. Denison. Corrosion 10, 169 (1954). 999. Effect of molecular weight on the crazing and tensile properties of polymethyl methacrylate, I. Wolock, M. A. Sherman, and B. M.

Axilrod. Natl. Advisory Comm. Aeronaut. Research Memo 54A04 (1954). 1000. Effect of sample preparation on precision

in the hide substance determination, S. Dahl.

J. Am. Leather Chemists Assoc. 49, 515

(1954). 1001. Effects of internal motion in the micro- wave spectrum of methylamine, D. R. Lide,

Jr. J. Chem. Phys. 22, 1613 (1954). 1002. Effects of multiaxial stretching on crazing and other properties of transparent plastics,

I. Wolock and D. A. George. Natl. Advisory Comm. Aeronaut. Research Memo 54F22

(1954). 1003. Effects of plastic and steel surfaces on

clotting time of human blood, J. C. Rose and

H. P. Broida. Proc. Soc. Exptl. Biol. Med.

J. 86, 384 (1954). 1004. Effects of resin coating methods and other variables on physical properties of glass-fabric reinforced polyesters, J. E. Wier, D. C. Pons, and B. M. Axilrod. Natl. Advisory Comm.

Aeronaut. Research Memo 54G26 (1954). 1005. Einschliessung von Eigenwerten hermitescher Matrizen nach dem Abschnittsverfahren,

H. Wielandt. Arch. Math. (Tiibinger, Germany)

5, 108 (1954). 1006. Elastic scattering of photons, E. G. Fuller and E. V. Hayward. Phys. Rev. 94, 732

(1954). 1007. Electrical and optical properties of inter- metallic compounds. I. Indium antimonide,

R. G. Breckenridge, R. F. Blunt, W. R. Hosier, H. P. R. Frederikse, J. H. Becker, and W. Oshinsky. Phys. Rev. 96, 571 (1954); II. Gallium antimonide, R. F. Blunt, W. R. Hosier, and H. P. R. Frederikse. Phys. Rev.

9 6, 576 (1954); III. Aluminum antimonide, R.

F. Blunt, H. P. R. Frederikse, J. H. Becker,

and W. R. Hosier. Phys. Rev. 96, 578 (1954). 1008. Electrical measurements in the selection

of bolt materials for service underground, W.

J. Schwerdtfeger. Corrosion 10, 355 (1954). 1009. Electroforming, V. A. Lamb and W. H. Metzger. Tool Engr. 33, 55 (1954). 1010. Electroless plating comes of age, A. Brenner. Metal Finishing 52, No. 11, 68; No.

i2, 61 (1954). 1011. Electron microscopy, M. Swerdlow.

Anal. Chem. 26, 178 (1954). 1012. Electrothermic instruments for the measurement of alternating current and volt- age, F. L. Hermach. Proc. Symp. Natl. Phys. Lab. , Precisions of Electrical Measurement, Teddington, England. (H. M. Station

Office, London, England) (1954).

1013. Emission spectroscopy, W. F. Meggers.

Anal. Chem. 26, 54 (1954). 1014. Energy loss of electrons in passage

through thin films, L. Marton and L. B. Leder.

Phys. Rev. 94, 203 (1954). 1015. Energy spectrum resulting from electron slowing down, L. V. Spencer and U. Fano. Phys. Rev. 93, 1172 (1954). 1016. Energy transfer in hot gases, E. K. Plyler and W. S. Benedict. Reprint of "Highresolution spectra of hydro- carbon flames in the infrared" from Symp. at Washington, D. C.

(1954). 1017. Estimation of correlation coefficients from scatter diagrams, G. R. Sugar. J. Appl. Phys. 25, 354 (1954). 1018. Evaluation of Coulomb wave functions along the transition line, M. Abramowitz and

P. Rabinowitz. Phys. Rev. 96, No. 1, 77

(1954). 1019. Experiments in the solution of differential equations by Monte Carlo methods, J. Todd. J. Wash. Acad. Sci. 44, No. 12, 377

(1954). 1020. Extending the range of the NBS stiffness tester, V. Worthington. Tappi 37, 384 (1954). 1021. Film badge dosimetry: how much fading occurs? W. L. McLaughlin and M. Ehrlich. Nucleonics 12, No. 10, 34 (1954). 1022. Gain stable mixers and amplifiers with current feedback, G. E. Boggs. Proc. IRE

42, No. 7, 1145 (1954). 1023. Generalized commutators of matrices

and permutations of factors in a product of three matrices, O. Taussky. Studies in Math, and Mechanics, p. 67 (Academic Press, Inc. , New York, N. Y. ) (1954). 1024. Geographic and temporal distribution of polar blackouts, V. Agy. J. Geophys. Research 59, No. 4, 499 (1954). 1025. Giauque-Kelving proposal, F. G. Brick- wedde. Phys. Today 7, 4 (1954). 1026. Glass fiber papers, R. B. Hobbs. Sixth Annual Report of Tech. Assoc. Graphic Arts,

p. 104 (1954). 1027. Heat content of lead from 0° to 900°, and

the heat of fusion, T. B. Douglas and J. L. Dever. J. Am. Chem. Soc. 76, 4824 (1954). 1028. Heats of wetting of collagen, leather, and

other organic and fibrous materials, J. R. Kanagy. J. Am. Leather Chemists Assoc. 49, 646 (1954). 1029. High- power pulser aids cathode studies, L. A. Marzetta. Electronics 27, 178 (1954). 1030. High-speed machine computation of ideal gas thermodynamic functions. I. The isotopic water molecules, A. S. Friedman and L. Haar.

J. Chem. Phys. 22, 2051 (1954). 1031. High-speed stroboscope for accelero- meter calibration, P. G. Sulzer, E. R. Smith, and S. Edelman. Rev. Sci. Instr. 25, No. 8, 837 (1954). 1032. High- temperature liquids, R. E. Florin and T. W. Mears. Conf. on Reactor Heat

Transfer, Report ENL 2446, 89, Brookhaven

National Laboratories (Brookhaven, Long

Island, N. Y. ) (1954). 1033. Improved dip coater, A. G. Roberts and

R. S. Pizer. Anal. Chem. 26, 790 (1954).

101
1034. Improved stainless steel needle valve,

A. R. Glasgow, Jr. , and G. S. Ross. Anal. Chem. 26, 2003 (1954). 1035. Index of refraction of fused-quartz glass

for ultraviolet, visible, and infrared wavelengths, W. S. Rodney and R. J. Spindier. J. Opt. Soc. Am. 44, No. 9, 677 (1954). 1036. Index to the literature on spectrochemical analysis. Part III- 1946- 1950 (226 pgs), B. F. Scribner and W. F. Meggers. Am. Soc. Testing Materials Spec. Tech. Pub. 41-

(1954). 1037. Inelastic collisions and the Moliere

theory of multiple scattering, U. Fano. Phys. Rev. 93, 117 (1954). 1038. Infrared absorption of liquid water from

2 to 42 microns, E. K. Plyler and N. Acquista.

J. Opt. Soc. Am. 44, 505 (1954). 1039. Infrared photoconductivity due to neutral impurities in germanium, E. Burstein, J. W.

Davisson, E. E. Bell, W. J. Turner, and H.

G. Lipson. Phys. Rev. 93, 65 (1954). 1040. Infrared spectrum of hydrogen sulfide, U. The 5100 cm-1 region, E. K. Plyler and

H. C. Allen, Jr. J. Chem. Phys. 22, 1104

(1954). 1041. Instrumental drift, W. J. Youden.

Science 120, 627 (1954). 1042. Instrumentation- -Revolution in industry, science, and warfare, W. A. Wildhack.

Science 120, 15A (1954). 1043. Instruments for magnetic high frequency measurements, P. H. Haas, R. D. Harrington, R. C. Powell, and A. L. Rasmussen.

Wright Air Development Center Tech. Report

54-238 (1954). 1044. Intensity distributions in nitrogen bands

excited in auroras and by high- energy protons and hydrogen atoms, L. M. Branscomb, R. J. Shalek, and T. W. Bonner. Trans. Am. Geophys. Union 35, 107 (1954). 1045. Introductory remarks on the dosimetry

of ionizing radiations, U. Fano. Radiation Research 1, 3 (1954). 1046. Invariance of insidedness in projective transformations of the Maxwell triangle, G. Wyszecki. J. Opt. Soc. Am. 44, 524 (1954). 1047. Kinetics of crystallization in polymers,

I. Bulk polymers, L. Mandelkern, F. A. Quinn, and P. J. Flory, Jr. J. Appl. Phys.

25, 830 (1954). 1048. Laboratory standard microphones, R.

K. Cook. Acustica (Zurich, Switzerland) 4, 101 (1954). 1049. Lead resistance errors in watthour- meter phantom load test, F. L. Hermach and

T. L. Zapf. Elec. World 141, 113 (1954). 1050. Linear functional equations and inter- polation series, P. Davis. Pacific J. Math.

4, No. 4, 503 (1954). 1051. Linear programming in bid evaluation,

L. Gainen, D. J. Honig, and E. D. Stanley. Logistics Research Quart. 1, 48 (1954). 1052. Liquid level indicator for condensed

gases at low temperature, W. E. Williams,

Jr. and E. Maxwell. Rev. Sci. Instr. 25, No. 2, 111 (1954). 1053. Lithium fluoride; Heat content from 0°

to 900", the melting point and heat of fusion, T. B. Douglas and J. L. Dever. J. Am. Chem.

Soc. 76, 4826 (1954).

1054. Location of the auroral absorption zone, V. Agy. J. Geophys. Research 59, 267 (1954). 1055. Low temperature physics, F. G. Brick- wedde. J. Am. Chem. Soc. 76, 2030 (1954). 1056. Low- pass duplexing system for high- frequency pulse transmitters, W. L. Hartsfield and R. Silberstein. Tele- Tech. 13, 76

(1954). 1057. Magnetic and thermal properties of chromic methylamine alum below 1 °K, R. P. Hudson and C. K. McLane. Phys. Rev. 95, No. 4, 932 (1954). 1058. Masonry cracking and damage caused

by moisture expansion of clay tile, J. W. McBurney. Am. Soc. Testing Materials Proc. 54, 1219 (1954). 1059. Masonry requirements up to date, J. W. McBurney. Standards 25, No. 11, 358 (1954). 1060. Mass spectrometry, V. H. Dibeler. Anal. Chem. 26, 58 (1954). 1061. Mathematical foundations and computational methods for a digital logic machine,

R. S. Ledley. J. Operations Research Soc. Am. 2, No. 3, 249 (1954). 1062. Maximum usable frequencies and lowest

usable frequencies for the path Washington to Resolute Bay, S. M. Ostrow. Letter to Editor, J. Geophys. Research 59, 3 (1954). 1063. Measurement and theoretical study of electrical conductivity and Hall effect in oxide cathodes, R. Forman. Phys. Rev. 96, No.

6, 1479 (1954). 1064. Measurement of burning velocities, E.

F. Fiock. Section K, vol. 9, Princeton University Series on High Speed Aerodynamics

and Jet Propulsion (Princeton, N. J.) (1954). 1065. Measurement of creep of acrylic glazing plastics exposed to temperature gradients, M. C. Slone and F. W. Reinhart. SPE J. 10, 29 (1954). 1066. Measurement of distortion produced in guarded electrostatic fields by grounded ex- ternal plates, W. Miller and R. J. Kennedy.

Rev. Sci. Instr. 25, 1031 (1954). 1067. Measurements of chromium potassium alum below 1 °K, E. Ambler and R. P. Hudson.

Phys. Rev. 95, 1143 (1954). 1068. Measuring circuit for radiometers, R.

P. Teele. J. Opt. Soc. Am. 44, No. 11, 860 (1954). 1069. Mechanical properties of direct filling resins, W. T. Sweeney, W. D. Sheehan, and

E. L. Yost. J. Am. Dental Assoc. 49, 513

(1954). 1070. Mechanical stops for use with helical potentiometers, P. D. Lowell, W. Hakkarinen, and L. M. Allison. Rev. Sci. Instr. 25, No. 4, 398 (1954). 1071. Message error in diversity frequencyshift reception, G. F. Montgomery. Proc. IRE 42, No. 7, 1184 (1954). 1072. Mesures dans l'infrareuge avec un pris- me en iodure de cesium, E. K. Plyler. Extrait dur Journal de Physiquet et le Radium,

(Paris, France) 15, 519 (1954). 1073. Meteorological instrumentation at the National Bureau of Standards, W. K. Gautier. Weatherwise 7, No. 4, 86 (19 54). 1074. Microwave absorption by the nonpolar

gas CO2, G. Birnbaum, A. A. Maryott, and

P. F. Wacker. J. Chem. Phys. 22, 1782 (1954).

102
1075. Microwave spectrum of benzonitrils,

D. R. Lide, Jr. J. Chem. Phys. 22, 1577

(1954). 1076. Montecarlo calculations of T-ray backscattering and transmission, M. J. Berger.

Radiation Research 1, No. 5, 489 (1954). 1077. Motion of small particles in skew shape suspended in a viscous liquid, C. M. Tchen.

J. Appl. Phys. 25, 463 (1954). 1078. Motion of the storm- D region, V. Agy. Nature 173, 445 (1954). 1079. Multiple scattering of relativistic elec- trons, L. V. Spencer and C. H. Blanchard. Phys. Rev. 93, 114 (1954). 1080. Nature of adhesion, F. W. Reinhart.

J. Chem. Educ. 31, 128 (1954). 1081. New techniques for evaluating natural corundum ores, H. F. Carl, H. W. Jaffe, and

A. Hockman. Mining Eng. 6, No. 4, 402 (1954). 1082. Note on the adjustment of Mooney vis- cometer die closure, G. E. Decker. ASTM

Bull. No. 195, (TP13) (1954). 1083. Note on the Bragg- Gray cavity principle

for measuring energy dissipation, U. Fano.

Radiation Research 1, 237 (1954). 1084. Note on the circle theorem of hydro- dynamics, E. Levin. Quart. Appl. Math. 12, No. 3, 315 (1954). 1085. Note on the strength of picric acid, R. G. Bates and G. Schwarzenbach. Experientia 10, 482 (1954). 1086. Nuclear elastic scattering of photons, E. V. Hayward and E. G. Fuller. Phys. Rev.

95, 1106 (1954). 1087. Nucleonics, C. L. Gordon. Anal. Chem.

26, 176 (1954). 1088. Obituary notice on L. F. Richardson, J. Todd. Math. Tables and Other Aids to Computation 8, 242 (1954). 1089. Observations in abrasion testing, J. R.

Giles. Proc. Porcelain Enamel Inst. Forum

16, 136 (1954). 1090. Observations on field exposures of en- ameled ranges, J. R. Crandall. Proc. of the Porcelain Enamel Inst. Forum 16, 27 (1954). 1091. On a theorem of Ostrowski and Taussky,

R. Bellman and A. J. Hoffman. Archiv Der

Mathematik 5, 123 (1954). 1092. On modified divided differences I, G. Blanch. Math. Tables and Other Aids to Computation 8, No. 45, 1 (1954). 1093. On representations and extension of bounded linear functionals defined on classes

of analytic functions, P. Davis and J. L. Walsh. Trans. Am. Math. Soc. 76, No. 2, 190 (1954). 1094. On rotational viscous flow through a

tube, P. Henrici. J. Appl. Math, and Phys.

(Basel, Switzerland), V, No. 6, 511 (1954). 1095. On strongly continuous stochastic processes, E. Lukacs. Sankhya 13, 219 (1954). 1096. On the estimation of quadrature errors

for analytic functions, P. Davis and P. Rabinowitz. Math. Tables and Other Aids to Computation 8, No. 48, 193 (1954). 1097. On the linear iteration procedures for symmetric matrices, A. M. Ostrowski. Rend.

Mat. App.{v} Vm, No. 3-4, 140 (1954). 1098. On the practical evaluation of integrals, M. Abramowitz. J. Soc. Indust. App. Math.

2, 20 (1954).

1099. On the solution of the caterer problem,

J. W. Gaddum, A. J. Hoffman, and D. Sokolowsky. Logistics Research Quart. 1, 223

(1954). 1100. On the spectrum of a one parametric

family of matrices, A. M. Ostrowski. J. Reine Angew Math. (Berlin, Germany) 193, 143 (1954). 1101. On two problems in abstract algebra con- nected with Horner 's rule, A. M. Ostrowski.

Studies in Math, and Mechanics, p. 40 (Aca- demic Press, Inc., New York, N. Y. ) (1954). 1102. Optimum grouping in one- criterior vari- ance components analysis, E. P. King. J. Am.

Stat. Assoc. 49, 637 (1954). 1103. Paper production on the upswing, R. B. Hobbs and W. K. Wilson. Chem. Eng. News

32, 40 (1954). 1104. Phosphorescence of atoms and molecules

of solid nitrogen at 4. 2 °K, H. P. Broida and

J. R. Pellam. Phys. Rev. 95, No. 3, 845

(1954). 1105. Photodetachment of the hydrogen negative

ion, L. M. Branscomb and W. L. Fite. Phys. Rev. 93, 651 (1954). 1106. Photodisintegration of helium 4, E. G.

Fuller. Phys. Rev. 96, 1306 (1954). 1107. Physical chemistry of synthetic rubbers,

L. A. Wood. Chapter X in the book "Synthetic Rubber" p. 316 (John Wiley and Sons, Inc. , New York, N. Y. ) (1954). 1108. Plastic deformation of ceramic- oxide

single crystals, J. B. Wachtman, Jr. , and

L. H. Maxwell. J. Am. Ceram. Soc. 37, 291

(1954). 1109. Plastics literature in Government reports,

J. Kanegis and I. Wolock. Am. Chem. Soc. Advances in Chem. Ser. No. 10, 151 (1954). 1110. Plate separation requirements for standard

free- air ionization chambers, F. H. Attix and L. DeLaVergne. Radiology 63, No. 6, 853 (1954). 1111. Precision quartz resonator frequency

standards, J. H. Shaaf and J. M. Shaull. Proc. IRE 42, No. 8, 1300 (1954). 1112. Predictions of the present sunspot cycle, A. G. McNish and J. V. Lincoln. Trans. Am.

Geophys. Union 35, 709 (1954). 1113. Preferred circuits manual with engineering notes, J. H. Muncy. Bu. Aeronaut. Report

3492 (1954). 1114. Pressure calibration of condenser microphones above 10,000 cps, B. Simmons and F.

Biagi. J. Acoust. Soc. Am. 26, 693 (1954). 1115. Pressure- volume temperature relations

of liquid normal deuterium, A. S. Friedman, M. Trzeciak, and H. L. Johnston. J. Am.

Chem. Soc. 76, 1552 (1954). 1116. Probability limits for the average chart when process standards are unspecified, E. P. King. Ind. Qual. Control 10, 62 (1954). 1117. Procedure used to improve the quality of ionospheric data, S. C. Gladden. Trans. Am.

Geophysical Union 35, 398 (1954). 1118. Programs for computing hyper geometric

series, W. F. Cahill. Math. Tables and Other

Aids to Computation 8, 36 (1954). 1119. Prolonged space-wave fadeouts at 1,046 Mc observed in Cheyenne Mountain propagation program, B. R. Bean. Proc. IRE 42, No. 5, 848 (1954).

103
1120. Propagation constant in rectangular wave

guide of finite conductivity, D. M. Kerns and

R. W. Hedberg. J. Appl. Phys. 25, No. 12, 1550 (1954). 1121. Properties of fibers, W. D. Appel. Smithsonian Physical Tables, p. 241 (Smithsonian Institution, Washington, D. C. ) (1954). 1122. Properties of plastic films, M. C. Slone and F. W. Reinhart. Modern Plastics 31, 203

(1954). 1123. Pulse-height measurements of recoils from B

10 (n,<Z) Li7

, J. A. Dejuren and H. Rosenwasser. Phys.. Rev. 93, 831 (4954). 1124. Radioactivity of In 117 and Sb 117

, C. L. McGinnis. Bull. Am. Phys. Soc. 29, No. 1, 43A (1954). 1125. Radiology biology, U. Fano. Chapter I in the book, Principles of radiological physics (McGraw-Hill Publishing Co. , New York,

N. Y. ) I, 1 (1954). 1126. Recent trends in glass analysis, F. W.

Glaze. Am. Ceram. Soc. Bull. 33, 45 (1954). 1127. Regular and irregular Coulomb wave

functions expressed in terms of Bessel- Clifford

functions, M. Abramowitz. J. Math. Phys. 33, 111 (1954). 1128. Relation between net heat of combustion

and aniline- gravity product of aircraft fuels, R. S. Jessup and J. A. Cogliano. ASTM Bull. No. 201, (TP217), 55 (1954). 1129. Report of the Committee on Atomic

Weights of the American Chemical Society, E. Wichers. J. Am. Chem. Soc. 76, 2033

(1954). 1130. Research and standards for the plastics industry, G. M. Kline. Modern Plastics 31, No. 12, 127 (1954). 1131. Review of some methods of flow measurement, W. A. Wildhack. Science 120, No. 3110,

191 (1954). 1132. Rheology of polyisobutylene. I. Theory

and experimental procedures, H. Leaderman,

J. Polymer Sci. 13, 371 (1954); li. Low molecular weight polymers, H. Leaderman, R. G. Smith, and R. W. Jones, J. Polymer Sci. 14, 47 (19 54); and IV. Calculation of the retardation time function and dynamic response from

creep data, H. Leaderman, Proc. Second Inter- nal Congress on Rheology, edited by V. G. W.

Harrison (Butterworth's Scientific Publications, London, England) (1954). 1133. Role of nickel dip in the enameling of sheet steel, D. G. Moore, J. W. Pitts, and W. N. Harrison. J. Am. Ceram. Soc. 37, No. 8, 363 (1954). 1134. Scale and reading errors of electrical indicators, F. D. Weaver. Instr. and Auto- mation 27, No. 11, 1812 (1954). 1135. Scattered radiation contribution to depth dose data for 35-Mev and 90-Mev synchrotron X-rays, J. W. Boag and B. Zendle. Phys. Rev.

95, 608A (1954). 1136. Scintillation spectrometers for measuring

total energy of X-ray photons, R. S. Foote and

H. W. Koch. Rev. Sci. Instr. 25, 746 (1954). 1137. Second sound attenuation in liquid helium

II, W. B. Hanson and J. R. Pellam, Phys. Rev. 95, 321 (1954).

1138. Smithsonian Physical Tables, Vol. 120, Pub. 4169 prepared by W. E. Forsythe. Table

664 "Elements in the Sun's Atmosphere", C. E. Moore. (Table 620 "Solar Wave Lengths" and Tables 710, 711 "Binding Energies of Electrons' are from papers listed above.) (Smithsonian Institution, Washington, D. C. ) (1954). 1139. Smooth patterns of production, A. J. Hoffman and W. Jacobs. Management Science

1, 86 (1954). 1140. Some applications of extreme- value

theory, E. J. Gumbel and J. Lieblein. Am.

Stat. 8, 14 (1954). 1141. Some aspects of the charge and discharge processes in lead- acid storage batteries, D. N. Craig and W. J. Hamer. Appl. and Ind. No. 11, 22 (1954). 1142. Some implications of Liapunov's conditions

for stability, H. A. Antosiewicz and P. Davis.

J. Rational Mechanics and Analysis 3, No. 4, 447 (1954). 1143. Some information theory aspects of propagation through time varying media, J. Feinstein. IRE Conv. Record, Mar. 22, 1954, [2] pt. 1, Antennas and Propagation, p. 87. 1144. Some ions of high kinetic energy in mass

spectra of polyatomic moLecules, F. L. Mohler,

V. H. Dibeler, and R. M. Reese. J. Chem.

Phys. 22, 394 (1954). 1145. Some remarks on commutators of matrices, K. Fan. Arch. Math. (Tubinger, Germany),

5, 102 (1954). 1146. Some results of sweep- frequency investi- gation in the low frequency band, J. M. Watts and J. N. Brown. J. Geophys. Research 59, 71 (1954). 1147. Some stochastic problems in wave propagation, Part I, J. Feinstein. IRE Trans. Ant. Prop. AP-2, 23 (1954). 1148. Some theorems for partially balanced

designs, W. S. Connor and W. H. Clatworthy. Ann. Math. Stat. 25, 100 (1954). 1149. Space charge wave amplification in a shock front and the fine structure of solar radio noise, H. K. Sen. Australian J. Phys. 7, 30 (1954). 1150" Spatial distribution of energy dissipation by high- energy X-rays, H. Brysk. Phys. Rev.

96, No. 2, 419 (1954). 1151. State control of protection against ion- izing radiation, L. S. Taylor. Am. J. Roentgenol. , Radium Therapy Nuclear Med.

71, 691 (1954); Acta Radiol. (Stockholm, Sweden)

Suppl. 116, 21 (1954). 1152. Structure of some iridium- osmium alloys, H. C. Vacher, C. J. Bechtoldt, and E. Maxwell.

J. Metals 6, No. 1, 80 (1954); Trans. Am. Inst. Mining Engrs. 200, 80 (1954). 1153. Studies of oxidation behavior of enameling

iron during firing, A. G. Eubanks, J. C. Rich- mond, and D. G. Moore. Finish 11, No. 5, 50

(1954). 1154. Subharmonic crystal oscillators, M. C. Thompson, Jr. , C. E. Tschiegg, and M.

Greenspan. Rev. Sci. Instr. 25, 8 (1954). 1155. Summary of symposium on color of trans- parent and translucent products, D. B. Judd. ASTM Bull. No. 202, p. 72 (1954).
19: 1156. Surface tension, density, viscosity, and

electrical resistivity of molten binary alkaline- earth borates, L. Shartsis and H. F. Shermer.

J. Am. Ceram. Soc. 37, No. 11, 544(1954).

1157. Survey of adhesion and types of bonds

involved, F. W. Reinhart. Chapter in a book

"Adhesion and Adhesives, Fundamentals and

Practice, " p. 9 (John Wiley & Sons, Inc. , New

York, N. Y. ) (1954). 1158. Sweep frequency backscatter- - some

observations and deductions, R. Silber stein. IRE Trans. Ant. Prop. AP-2, No. 2, 56 (1954). 1159. Swelling of collagen and modified colla- gen, J. M. Cassel and E. McKenna. J. Am.

Leather Chemists Assoc. 49, 553 (1954). 1160. Tables 142 to 144, thermal expansion,

P. Hidnert and H. S. Krider. 9th Edition of

the Smithsonian Phys. Tables (Smithsonian

Institution, Washington, D. C. ) (1954). 1161. Tables of expected values of 1/X for positive Bernoulli and Poisson variables, E. Grab and I. R. Savage. J. Am. Stat. Assoc.

49, 169 (1954). 1162. Temperature dependence of the micro- wave absorption of NH, , G. Birnbaum and A.

A. Maryott. J. Chem. Phys. 22, No. 8, 1457 (1954). 1163. Temperature measurements in highvelocity streams of hot gas, E. F. Fiock and

A. I. Dahl. Proc. First Iowa Thermodynamics

Symp. , p. 190, State University of Iowa (Iowa

City, Iowa)(1954).

1164. Temperature measurements in the Mooney

viscometer, G. E. Decker and R. D. Stiehler. ASTM Bull. No. 195, (TP7)(1954).

1165. Temperatures developed in rotating dental cutting instruments, D. C. Hudson and W. T. Sweeney. J. Am. Dent. Assoc. 48, 127 (1954). 1166. Terminology for describing the performance of analytical and other precise balances,

L. B. Maccurdy, H. K. Alber, A. A. Benedetti-Pichler, H. Carmichael, A. H. Corwin,

R. M. Fowler, E. W. D. Huffman, P. L. Kirk, and T. W. Lashof. Anal. Chem. 26, 1190

(1954). 1167. Test methods, specifications and stand- ards for plastics, G. M. Kline. Am. Chem.

Soc. Advances in Chem. Ser. No. 10, 145

(1954). 1168. Testing a quick-weighing balance, T. W.

Lashof and L. B. Macurdy. Anal. Chem. 26, 707 (1954). 1169. Testing of photographic lenses at the National Bureau of Standards , F. E. Washer.

Photographic Eng. 5, No. 1, 37 (19 54). 1170. The albedo of various materials for 1 Mev photons, E. V. Hayward and J. H. Hubbell. Phys. Rev. 93, 955 (1954). 1171. The attenuation of gamma rays at oblique incidence, F. S. Kirn, R. J. Kennedy,

and H. O. Wyckoff. Radiology 63, 94 (1954). 1172. The calcium silicate hydrates, R. H. Bogue. Proc. International Congress of Industrial Chem,, Portland Cement Assoc.

Fellowship Paper No. 69 (1954). 1173. The compressibility of liquid normal

hydrogen from the boiling point to the central

point at pressures up to 100 atmospheres, H.

L. Johnston, W. E. Keller, and A. S. Fried- man. J. Am. Chem. Soc. 76, 1482 (1954).

1174. The concentration dependence of the sedi- mentation constants of flexible macromolecules

,

M. Wales and K. E. Van Holde. J. Polymer

Sci. 14, 81 (1954). 1175. The condition of certain matrices, II, J. Todd. Arch. Math. (Tubenger, Germany)

5, 249 (1954). 1176. The decomposition of CF4 in flames,

D. E. Mann, H. P. Broida, and H. P. Squires.

J. Chem. Phys. 22, 348 (1954). 1177. The development of some infrared trans- mitting glasses, G. W. Cleek and E. H. Hamilton. Proc. of the Conference of Infrared

Optical Materials, Filter and Films; Eng. Research and Dev. Laboratories; The Eng. Ctr.

Ft. Belvoir, Va. , p. 1 (1954). 1178. The disintegration of Bal 13, R. W. Hay- ward, D. D. Hoppes, and H. Ernst. Phys. Rev.

93, 916 (1954). 1179. The disintegration of Nb91 and Nb92,

R. W. Hayward, D. D. Hoppes, and H. Ernst.

Bull. Am. Phys. Soc. 29, No. 7, 16A(1954).

1180. The distribution of linear energy transfer, or "ion density" for fast neutrons in water,

J. W. Boag. Radiation Research 1, No. 4, 323

(1954). 1181. The drying twist in plant fibers, S. B. Newman and H. F. Riddell. Textile Research

J. 24, 113 (1954). 1182. The dynamic bulk viscosity of polyiso- butylene, R. S. Marvin, R. Aldrich, and H. S. Sack. J. Appl. Phys. 25, No. 10, 1213 (1954). 1183. The dynamic mechanical properties of polyisobutylene, R. S. Marvin. Proc. Second

Intern. Congr. Rheol. , Edited by V. G. W.

Harrison (Butterworth's Scientific Publications), (London, England) (1954). 1184. The effect of preheating on thermal ex- pansion of silica- gypsum investments, G. F. Glasson, W. T. Sweeney, and I. C. Schoonover.

J. Am. Dental Assoc. 48, 433 (1954). 1185. The Herzberg bands of O-, in an oxygen

afterglow and in the night sky spectrum, H. P. Broida and A. G. Gaydon. Proc. Roy. Soc. , Series[A] 222, 181 (1954). 1186. The influence of heat treating variables on the martensite transformation in SAE 1050

steel, M. R. Meyerson and S. J. Rosenberg.

Trans. Am. Soc. Metals 45, 1225 (1954). 1187. The infrared spectrum of hydrogen sulfide in the 5100 cm

region, H. C. Allen, Jr., and E. K. Plyler. J. Chem. Phys. 22, 1104

(1954). 1188. The International Geophysical Year: A

progress report, J. Kaplan and A. H. Shapley. News Report Natl. Research Council 4, No. 6,

1 (1954). 1189. The measurement of ionizing radiations

for biological purposes, L. Marinelli and L. S. Taylor. Biological Effects of Radiation (McGrawHill Book Co., Inc., New York, N. Y. ) (1954). 1190. The need for a new type of frequency and

time standard, W. D. George. Proc. IRE 42, 1349 (1954). 1191. The nightglow: a review of observational

results, F. E. Roach. Proc. Intern. Union Geodesy and Geophys. (Rome, Italy) (1954). 1191A. The physical properties of terpenes.

III. The vapor pressures of alpha pinene and

beta pinene, J. E. Hawkins and G. T. Armstrong.

J. Am. Chem. Soc. 76, 3756 (19^4).

6

105
19 1192. The preparation of some aryl silanes, M. Maienthal, M. Hellmann, C. P. Haber, L.

A. Hymo, S. Carpenter, and A. J. Carr. J. Am. Chem. Soc. 76, 6392 (1954). 1193. Unassigned.

1194. The relation of occlusal surfaces to the

stability of artificial dentures, R. S. Ledley.

J. Am. Dental Assoc. 48, 508 (1954}. 1195. The relative basicities of tribenzylamine

and tribenzylamine oxide in benzene and water. Preparation and properties of tribenzylamine

oxide, M. M. Davis and H. B. Hetzer. J. Am.

Chem. Soc. 76, 4247 (1954). 1196. The relaxation method for linear inequalities, S. Agmon. Can. J. Math. 6, 382 (1954). 1197. The relaxation method for linear inequalities, T. S. Motzkin and I. J. Schoenberg. Can.

J. Math. 6, 393 (1954). 1198. The representation of integers by binary

quadratic rational forms, K. Goldberg, M. Newman, E. G. Straus, and J. D. Swift. Arch.

Math. (Tiibinger, Germany) 5, 12 (1954). 1199. The response of earphones in ears and

couplers, M. D. Burkhard and E. L. R. Corliss. J. Acoust. Soc. Am. 26, No. 5, 679

(1954). 1200. The standardization of beta- emitting nuclides, H. H. Seliger and A. Schwebel. Nucleonics 12, No. 7, 54 (1954). 1201. The temperature- independent para- magnetism of ammonium hexabromoosmate, IV, R. B. Johannesen and A. R. Lindberg. J. Am.

Chem. Soc. 76, 5349 (1954). 1202. The theory of the three- crystal electron interferometer, J. A. Simpson. Rev. Sci.

Instr. 25, No. 11, 1105 (1954). 1203. The thermal insulating value of airspaces,

H. E. Robinson and F. J. Powlitch. Housing

and Home Finance Agency (Washington, D. C. ) Housing Research Paper No. 32 (1954). 1204. The transmission of monoener getic posi- trons and electrons, H. H. Seliger. Phys. Rev.

95, 610A (1954). 1205. The vibrational spectra of n-dimethyl- aminodiborane, D. E. Mann. J. Chem. Phys.

22, 70 (1954). 1206. The vibrational spectrum of bromotrifluoroethylene, D. E. Mann, N. Acquista, and

E. K. Plyler. J. Chem. Phys. 22, 1199 (1954). 1207. The viscosity, thermal conductivity, and

Prandtl number for air, O,, N,, NO, H?

, CO,

COy, Hz O, He and A, J. Hilsenrath andT- . S. Touloukian. Trans. Am. Soc. Mech. Engrs.

76, No. 6, 967 (1954). 1208. The Zeeman effect in the first spectrum

of hafnium, W. F. Meggers. J. Opt. Soc. Am.

44, 348 (1954). 1209. Thermal degradation of polystyrene and

polyethylene, S. L. Madorsky. J. Polymer

Sci. 13, 185 (1954). 1210. Unassigned.

1211. Thick target bremsstrahlung spectra for

1. 00-, 1.25-, and 1.40- Mev electrons, W.

Miller, J. W. Motz, and C. Cialella. Phys.

Rev. 96, No. 5, 1344 (1954). 1212. Threshold field properties of some superconductors, E. Maxwell and O. S. Lutes. Phys. Rev. 95, 333 (1954). 1213. Total- absorption X-ray spectrometry,

application to betatron experiments, H. W. Koch and R. S. Foote. Nucleonics 12, 51 (1954). 1214. Transmission of reverberant sound

through walls, R. V. Waterhouse. Acustica

4, 290 (1954). 1215. Transport processes as functions of the Heisenberg and Obukoff theories of turbulence,

C. M. Tchen. Phys. Rev. 93, 4(1954).

1216. Transverse strength testing machine for denture resins, W. T. Sweeney, H. J. Caul, and W. Gneug. J. Am. Dental Assoc. 49, 174

(1954). 1217. Triathanolamin als puffer substanz, R. G. Bates and G. Schwarzenbach. Chim. Acta 37, 1439 (1954). 1218. Turbulent processes as observed in boundary layer and pipe, G. B. Schubauer. J. Appl. Phys. 25, 188 (1954). 1219. Two early papers on the relation between extreme values and tensile strength, J. Lieblein. Biometrika (London, England) 41, 559

(1954). 1220. Use of deuterium to investigate extent of branching in polystyrene, L. A. Wall and D. W.

Brown. J. Polymer Sci. 14, No. 78, 513

(1954). 1221. Ueber die Funktionen von Gegenbauer,

P. Henrici. Arch. Math. (Tubinger, Germany)

5, 92 (1954). 1222. Values of physical constants of different rubbers, L. A. Wood. Section of Smithsonian

Physical Tables, 9th Ed. Edited by W. E. Forsyth (Smithsonian Institution) Washington,

D. C.) (1954). 1223. Variational principles for the acoustic

field, E. Gerjuoy and D. S. Saxon. Phys. Rev.

94, No. 6, 1445 (1954). 1224. Vibrational spectra of trifluorethylene and trifluoroethylene-d, D. E. Mann, N. Acquista, and E. K. Plyler. J. Chem. Phys.

22, 1586 (1954). 1225. Viscometric and turbidimetr ic measurements on dilute aqueous solutions of a nonionic

detergent, L. M. Kushner and W. D. Hubbard.

J. Phys. Chem. 58, 1163 (1954). 1226. Water demand rates for electric drinking- water coolers of the bubbler type, P. R. Achenbach and C. W. Phillips. Refrig. Eng. , 62, No. 12, 37 (1954). 1227. What is the heat pump? P. R. Achenbach.

Parents Mag. 29, 56 (1954). 1228. Zeeman effect in spark lines of ruthenium, W. F. Meggers and G. R. Harrison. J. Opt. Soc. Am. 43, 816 (1954).

106
1955

1229. A cavity ionization theory including the

effects of energetic secondary electron, L. V. Spencer and F. H. Attix. Radiology 64, No. 1, 113 (1955). 1230. A comparison of X- ray standards, H. O. Wyckoff and G. H. Aston. Acta Radiol. Suppl.

117, 17 (1955). 1231. A comparison theorem for eigenvalues of normal matrices, K. Fan. Pacific J. Math.

5, Suppl. 2, 911 (1955). 1232. A determinantal inequality, K. Fan and

J. Todd. J. London Math. Soc. 30, 58 (1955). 1233. A dynamic spectrum analyzer for Sacra- mento Peak, D. H. Menzel, J. W. Warwick,

and R. S. Lawrence. Harvard College Observatory (Cambridge, Massachusetts), Scientific Report 20 (1955). 1234. An extremum property of sums of eigenvalues, H. Wielandt. Proc. Am. Math. Soc.

6, No. 1, 106 (1955). 1235. A graphical method for single-point determination of intrinsic viscosity, V. E. Hart. J. Polymer Sci. 17, 215 (1955). 1236. A microwave microcalorimeter , A. C. MacPherson and D. M. Kerns. Rev. Sci. Instr. 14, 27 (1955). 1237. A note on group matrices, O. Taussky.

Proc. Am. Math. Soc. 6, 984 (1955). 1238. A note on the estimation of sodium car- bonate in photographic developers, C. I. Pope. J. Soc. Motion Picture Television Engrs. 64, 420 (1955). 1239. A note on the preparation of solid ozone

and atomic oxygen, H. P. Broida and J. R. Pellam. J. Chem. Phys. 23, 409 (19 55). 1240. A pilot plant study of the process for treating heavy leather with polyisobutylene and

other polymers, R. Oehler, J. H. Davis, and

R. A. Kinmouth. J. Am. Leather Chemists

Assoc. 50, 16 (1955). 1241. A proposed index of current noise for composition resistors, G. T. Conrad, Jr. Proc. Electronic Components Symp. 118. (Sponsored by Am. Inst. Elec. Engr. New York,

N. Y.) (1955). 1242. A review of observational results in air- glow photometry, F. E. Roach. Annales

Geophys. (Paris, France) II, No. 2, 214 (1955). 1243. A review of pressure drop across columns

of bone char, F. G. Carpenter. Intern. Sugar J. 57, 12 (1955). 1244. A revision of American Dental Association specification No. 3 for dental impression compound, J. W. Stanford, G. C. Paffenbarger

,

and W. T. Sweeney. J. Am. Dental Assoc. 51, 56 (1955). 1245. A semi- micro dilution viscometer, V. E.

Hart. J. Polymer Sci. 17, 207 (1955). 1246. A theorem on alternatives for pairs of matrices, H. A. Antosiewicz. Pacific J. Math.

5, Suppl. 1, 641 (1955). 1247. A theory of cavity ionization, F. H.

Attix and L. V. Spencer. Radiol. Research 3, 239 (1955). 1248. A tree from the viewpoint of lightning, F. M. Defandorf. J. Wash. Acad. Sci. 45,

11 (1955). 1249. Abrasive jet method for measuring abrasion resistance of organic coatings, A. G. Roberts, W. A. Crouse, and R. S. Pizer. ASTM Bull. No. 208, 36 (1955).

147

1250. Absorption by concrete of X-rays and gamma- rays, B. E. Foster. BuDocks Technical Digest No. 55 and 56 (May 1955). 1251. Accelerated aging of record papers com

pared with normal aging, W. K. Wilson, J. L, Harvey, J. Mandel, and T. L. Worksman.

Tappi 38, No. 9, 543 (1955). 1252. Activities of the National Bureau of Standards Cryogenic Engineering Laboratory, R. B. Scott. Conf. de physique des basses

temperatures, September 2-8, 1955, 368 (Union Internationale de Physique pure et ap- pliquee Institut Internationale du Froid) (Paris France) (1955). 1253. Additional theorems for general Legend: and Gegenbauer functions, P. Henrici. J. Rational Mech. Anal. 4, No. 6, 983 (1955). 1254. Aerodynamical mechanisms producing

electronic density fluctuations in turbulent ionized layers, R. M. Gallet. Proc. IRE 43, 1240 (1955). 1255. Alignment of cerium and neodynium

E. Ambler, R. P. Hudson, and G. M. Temmer

Phys. Rev. 97, 1212 (1955). 1256. Alignment of three rare-earth isotopes, E. Ambler, R. P. Hudson, and G. M. Temmer

Bull. Intern. Inst. Refrig. , Commun. 143, 255

(1955). 1257. American Dental Association specification No. 13 for self-curing repair resins, J. W,

Stanford, C. L. Burns, and G. C. Paffenbarger

J. Am. Dental Assoc. 51, 425 (1955). 1258. Amplitude, scale, and spectrum of refractive index inhomogeneities in the first 125 meters of the atmosphere, G. Birnbaum and

H. E. Bussey. Proc. IRE 43, 1412 (1955). 1259. An algebraic proof of the isoperimetric

inequality for polygons, K. Fan, O. Taussky,

and J. Todd. J. Wash. Acad. Sci. 45, No. 11, 334 (1955). 1260. An alternative proof of a theorem on uni- modular groups, M. Newman. Proc. Am.

Math. Soc. 6, 998 (1955). 1261. An evaluation of electronic data processing equipment, S. N. Alexander. Proc. Auto- matic Data Processing Conf. (Harvard Graduate School of Business Administration, Cambridge, Massachusetts) (1955). 1262. An identity for the coefficients of certain modular forms, M. Newman. J. London Math.

Soc. 30, 488 (1955). 1263. Analysis of fluorinated polyphenyls by mass spectrometer, P. Bradt and F. L. Mohler. Anal. Chem. 27, 875 (1955). 1264. Analytic study of war games, H. A. Antosiewicz. Naval Research Logistics, Office

of Naval Research (Washington, D. C. ) 2, No. 3, 181 (1955). 1265. Angular distribution of multiple

gamma radiation from a plane isotropic source, M. J. Berger. J. Appl. Phys. 26, No. 12, 1504 (1955). 1266. Application of photoelasticity to the de- sign of tensile specimens for ceramic metal

materials, M. B. Stiefel. Bull. Am. Ceram.

Soc. 34, No. 5, 133 (1955). 1267. Application of two methods of numerical

analysis to the computation of the reflected rad- iation of a point source, P. Henrici. J. Wash.

Acad. Sci. 45, 38 (1955).

ed

569918 0—61 8 107
195

1268. Atomic flames: Spectra "temperatures"

and products, R. E. Ferguson and H. P. Broida. Fifth Symposium (International) on Combustion (Rheinhold Pub. Corp. , New York,

N. Y.) p. 754 (1955). 1269. Atomic spectra, C. E. Moore. Chapter

19 of Fundamental Formulas of Physics, D. H. Menzel, Ed. p. 451 (Prentice- Hall, Inc., New

York, N. Y. ) (1955). 1270. Unassigned.

1271. Aurora and airglow, C. T. Elvey and F. E. Roach. Sci. American 193, No. 3, 140

(1955). 1272. Automatic computation of nerve excitation, K. S. Cole, H. A. Antosiewicz, and P. Rabinowitz. J. Soc. Indust. Appl. Math. 3, 153 (1955). 1273. Automatic cut-off valve for ion- exchange

columns, C. A. Hewitt. Anal. Chem. 27, 865

(1955). 1274. Automatic instrument for electron scat- tering measurements, L. Marton, J. A. Simpson, and T. F. McCraw. Rev. Sci. Instr. 26, No. 9, 855 (1955). 1275. Begrundung fur die Beschaftigung mit numerischer Analysis, Yahres, J. Todd.

Bericht de DMV (Tubingen, Germany) 58, No.

1, 11 (1955). (Translation of "Motivation for working in numerical analysis").

1276. Unassigned.

1277. Breaking velocities, strain, energies, and theory neglecting wave propagation, Part

H, F. L. McCrackin, H. F. Schiefer, J. C. Smith, and W. K. Stone. Textile Research J. 25, 529 (1955). 1278. Bremsstrahlung differential cross- section measurements for 0.5- and 1 . 0- Mev electrons,

J. W. Motz. Phys. Rev. 100, No. 6, 1560

(1955). 1279. Building research in the U. S. before

1947, D. E. Parsons. Proc. Conference on

Building Research, October 21-23, 1953. Bull. 1 of Div. of Bldg. Research, Natl) Research Council, Ottawa, Canada, p. 1 (1955). 1280. Can we legislate ourselves into radiation safety? L. S. Taylor. Nucleonics 13, No. 3, 17 (1955). 1281. Capacity of plumbing stacks, R. S. Wyly and H. N. Eaton. The Plumber and J. of Heating (London, England) 76, No. 912, 26

(1955). 1282. Cathode film studies by the drainage method, A. Brenner and G. Wranglen. Sartrych

ur Svensk Kemish Tidskrift (Sweden) 67, 81

(1955). 1283. Cavity techniques for permeability measurements in the VHF region, R. D. Harrington. 6th Electronic Components Conf. Proc. May 27-29, 1955 (Los Angeles, Calif. ), p. 27 (1955). 1284. Cement, R. H. Bogue. Encyclopedia Americana 6, 188; Portland Cement Association Fellowship Paper No. 68 (19 55). 1285. Ceramic coatings for nuclear reactors

(a progress report), J. C. Richmond, H. G.

Lefort, C. N. Williams, and W. N. Harrison.

J. Am. Ceram. Soc. 38, No. 2, 72 (1955).

1286. Chaines de Markoff dans les ensenbles

abstraits et applications aux processus avec«

regions absorbantes et au probleme des boucles

(formerly, Time- discrete stochastic processes

in arbitrary sets, with applications to processes

with absorbing regions and to the problems of loops in Markoff chains), D. van Dantzig. Annales Inst. H. Poincare (Paris, France) 14, 145 (1955). 1287. Characteristic energy losses of electrons

in solids, L. Marton, L. B. Leder, and H. Mendlowitz. Advances in Electronics and

Electron Phys. 7, 183 (1955). 1288. Unassigned.

1289. Color and chemical constitution, W. R. Brode. Am. Scientist 43, No. 2, 259 (1955). 1290. Comparison of methods for measuring the

tensile and tear properties of plastic films, F. W. Reinhart and J. Mandel. ASTM Bull. No. 209, 50 (1955). 1291. Components for mechanized production,

B. L. Davis. Radio- Electronic Eng. 24, No.

3, 12 (1955). 1292. Compressibility of binary alkali borate and silicate glasses at high pressures, C. E. Weir and L. Shartsis. J. Am. Ceram. Soc. 38, No. 9, 299 (1955). 1293. Computation of vibration modes and fre- quencies on SEAC, W. F. Cahill and S. Levy.

J. Aeronaut. Sci. 22, No. 12, 837 (1955). 1294. Continuous analysis of ortho-parahydro- gen mixtures, D. H. Weitzel and L. E. White. . Rev. Sci. Instr. 26, 290 (1955). 1295. Unassigned.

129 6. Contribution to the study of transport phenomena in gases at high densities, A. Michels, J. A. M. Cox, A. Botzen, and A. S. Friedman. J. Appl. Phys. 26, 843 (1955). 1297. Corrosion research at the National Bureau of Standards, J. G. Thompson. Corrosion Technology (London, England)2, 102

(1955). 1298. Crazing of acrylic resins, W. T. Sweeney,

G. M. Brauer, and I. C. Schoonover. J. Am.

Dental Research 34, 306 (1955). 1299. Creep and creep rupture characteristics

of some riveted and spot- welded lap joints of aircraft materials, L. Mordfin. Natl. Advisory Comm. Aeronaut. Tech. Note 3412 (1955). 1300. Cross- field error in unsymmetr ical range

finders, R. E. Stephens. J. Opt. Soc. Am. 45, No. 3, 146 (1955). 1301. Cryogenics, F. G. Brickwedde, R. P. Hudson, and E. Ambler. Ann. Rev. Phys. Chem. 6, 25 (1955). 1302. Crystal- stabilized pulse- pair generator, M. C. Thompson, Jr. Rev. Sci. Instr. 26, 617 (1955). 1303. Cumulative fatigue damage of axially loaded Alclad 75S-T6 and Alclad 24S-T3 aluminum- alloy sheet, I. Smith, D. M. Howard, and F. C. Smith. Natl. Advisory Comm.

Aeronaut. Tech. Note 3923 (1955). 1304. Cyclic strain testing machine for leather,

T. J. Kilduff and J. R. Kanagy. J. Am.

Leather Chemists Assoc. 50, No. 10, 489

(1955).

108
19! 1305. Dangers of radiation, R. J. Nelsen and

S. W. Smith. J. Am. Dental Assoc. 50, No.

5, 581 (1955). 1306. Dental cements, G. C. Paffenbar ger

,

W. T. Sweeney and P. J. Schoubee. Intern. Dental J. 5, 584 (1955). 1307. Dental materials specifications and certification annual for 1954, G. C. Paffenbarger and W. T. Sweeney. Am. Dental Assoc. Publication (1955). 1308. Determination of aldehyde in cellulose: A

review of methods, W. K. Wilson. Tappi 38, 274 (1955). 1309. Determination of carbon monoxide in studies of air pollution, M. Shepherd, S. Schuh- mann, and M. Kilday. Anal. Chem. 27, 380

(1955). 1310. Determination of glucose by means of sodium chlorite, H. F. Launer, W. K. Wilson, and J. H. Flynn. Indian Pulp and Paper 9, 399

(1955). 1311. Determination of sulfur in rubber vulcanizates, E. W. Zimmerman, V. E. Hart, and E. Horowitz. Anal. Chem. 27, No. 10, 1606

(1955). 1312. Direct observation of nuclear absorption and elastic scattering of X-rays, H. W. Koch.

Proc. 1954 Glasgow Conference on Nuclear and Meson Physics (Pergamon Press, New York,

N. Y.) (1955). 1313. Discrete analogs of inequalities of Wirtinger, K. Fan, O. Taussky, and J. Todd. Monatsh. Mathematik (Vienna, Austria) Bd.

59/2 (1955). 1314. Discrete approximations to elliptic dif- ferential equations, W. Wasow. Zeit. angew

Math. Phys. (Basil, Switzerland) 6, Pt. 2, 81 (1955 >- d 120

1315. Disintegration of 5. 8 Sb , C. L. McGinnis. Bui. Am. Phys. Soc. 30, No. 1, 33A (1955). 1316. Disintegration of selenium- 73, R. W. Hayward and D. D. Hoppes. Bull. Am. Phys.

Soc. 30, No. 1, 33A (1955). 1317. Distribution of electron scattering by gold, L. Marton, J. A. Simpson, and T. F. McCraw.

Phys. Rev. 99, No. 2, 495 (1955). 1318. Distribution of phase diagrams of interest

to ceramists, E. Levin. Bull. Am. Ceram.

Soc. 34, No. 12, 399 (1955). 1319. Dose to walls in radiographic rooms, S. W. Smith and R. J. Kennedy. Radiology 64, 114A (1955). 1320. Double scattering of electrons with magnetic interaction, H. Mendlowitz and K. M.

Case. Phys. Rev. 97, 33 (1955). 1321. Dry cell standards broadened- -now in- cludes mercury-, air-, and flat- type cells,

J. P. Schrodt and W. J. Hamer. Mag. of Standards 26, No. 5, 132 (1955). 1322. Dynamics in the inlet system of a four- stroke single- cylinder engine, C. F. Taylor,

J. C. Livengood, and D. H. Tsai. Trans. Am.

Soc. Mech. Engrs. 77, No. 7, 1133 (1955). 1323. Eddy- current mutual- inductance trans- ducers with high- conductivity reference plates, H. M. Joseph and N. Newman. Commun. and

Electronics (published by Am. Inst. Elec. Engrs. ) Paper 55-4, No. 17, p. 1 (1955).

1324. Education in radiation protection, L. S. Taylor. Janeway Lecture, 1954, Am. J. Roentgenol. Radium Theraphy Nuclear Med. 73, 193 (1955). 1325. Effect of an anodic (HAE) coating on the fatigue strength of magnesium alloy specimens,

J. A. Bennett. Am. Soc. Testing Materials Proc. 55, 1015 (1955). 1326. Effect of dissociation on thermodynamic

properties of pure diatomic gases, H. W.

Woolley. Natl. Advisory Comm. Aeronaut. Tech. Note 3270 (1955). 1327. Effect of light on coated groundwood

papers, W. K. Wilson and J. L. Harvey.

Indian Pulp and Paper 9, 444 (1955). 1328. Effect of temperature and degree of poly- merization on the sorption of water by poly- methyl methacrylate, G. M. Brauer and W. T. Sweeney. Modern Plastics 32, No. 7, 138

(1955). 1329* Effect of the oxygen content of the furnace atmosphere on the adherence of vitreous coat- ings to iron, A. G. Eubanks and D. G. Moore.

J. Am. Ceram. Soc. 38, No. 7, 226 (1955). 1330. Electrical and optical properties of inter- metallic compounds. IV. Magnesium stannide, R. F. Blunt, H. P.R. Frederikse, and W. R. Hosier. Phys. Rev. 100, No. 2, 663 (1955). 1331. Electrodeposition of some of the less com- mon metals from nonaqueous media, A. Brenner. Record of Chem. Progr. 16, No. 4, 241 (1955). 1332. Electrolytic coatings on magnesium base

alloys from alkaline chr ornate solutions, F. Ogburn, H. I. Salmon, and M. L. Kronenberg.

Plating 42, 271 (1955). 1333. Electrolytic preparation of molybdenum

from fused salts, IV. Preparation of reduced molybdenum chlorides from molybdenite concentrate, S. Senderoff and R. J. Labrie. J. Electrochem. Soc. 102, 77 (1955). 1334. Electron affinity of atomic oxygen, L. M. Branscomb and S. J. Smith. Phys. Rev. 98, No. 4, 1127 (1955). 1335. Energy losses of electrons and their in- fluence on resolving power, L. Marton, L. B. Leder, H. Mendlowitz, J. A. Simpson, and C. Marton. Proc. of the Toulouse Conference, Centre National de la Recherche Scientifique (Paris, France) p. 175 (1955). 1336. European experience with electronic computers, S. N. Alexander. First Proc. , Electronics in Management (American University, Washington, D. C.)(1955).

1 337. Evaluation of the Boor- Quartermaster

snag tester for coated fabrics and plastic films, F. W. Reinhart, L. Boor, C. Brown, and J. J. Lamb. ASTM Bull. No. 210, 50 (1955). 1338. Experimental cross section for photo- detachment of electrons from H- and D- , L. M. Branscomb and S. J. Smith. Phys. Rev. 98, No. 4, 1028 (1955). 1339. Experimental evidence for the existence

of abnormal OH rotational "temperatures" in low pressure flames, H. P. Broida and H. J. Kostkowski. J. Chem. Phys. 23, 754 (1955). 1340. Experimental temperature measurements

in flames and hot gases, H. P. Broida. Temperature, Its Measurement and Control in Science and Industry (Reinhold Pub. Co. , New

York, N. Y. ) 2, 265 (1955).

109
1341. Extension of the Sen- White paper on at- mospheric oscillations, M. L. White. J. Geophys. Research 60, 531 (1955). 1342. Factors affecting radio propagation in the TV and FM bands , W. F. Utlaut. Tele- Tech.

14, No. 6, 98 (1955). 1343. Factors influencing the behavior of poly- mers exposed to high- energy radiation, L. A.

Wall. J. Polymer Sci. 17, 141 (1955). 1344. Farm milk tank testing, M. W. Jensen. Proc. 11th Annual Dairy Technology Conf.

(Univ. of Md. , College Park, Md. ) p. 6 (Nov.

19 55); Proc. Milk Industry Foundation Convention (Dairy Industries Foundation, Washington,

D. C. ) p. 41 (Oct. 1955). 1345. Fatigue and static tents of flush riveted

joints, D. M. Howard and F. C. Smith. Product Eng. Handbook No. 3, Section G, p. G2

(McGraw-Hill Book Co. , Inc. , New York,

N. Y. ) (1955). 1346. Flame photometric determination of strontium in portland cement, J. J. Diamond.

Anal. Chem. 27, 913 (1955). 1347. Flames, H. P. Broida and H. J. Morowitz. Sci. Monthly 80, No. 1, 3 (19 55). 1348. Fluorescence and average lifetime of excited OH ( 2 E + > in flames, H. P. Broida and

T. Carrington. J. Chem. Phys. 23, 2202

(1955). 1349. Frequency multipliers and converters for measurement and control, J. M. ShaulL Tele- Tech. 14, No. 4, section 1, 86 (1955). 1350. Fully convex normed linear spaces, K. Fan and I. Glicksburg. Proc. Natl. Acad. Sci.

41, No. 11, 947 (1955). 1351. Further infrared measurements with a cesium iodide prism molecular spectroscopy,

E. K. Plyler. The Institute of Petroleum

(London, England) (1955). 1352. Galvanomagnetic effects in InSb, W. R. Hosier and H. P. R. Frederikse. Phys. Rev.

98, 1532A (1955). 1353. Gas tube stabilized power supplies, S. Rubin and D. Scott. Tele-Tech 14, No. 7, 70

(1955). 1354. Geometric factors in electrical measurements relating to corrosion and its prevention, W. J. Schwerdtfeger and I. A. Denison. Corrosion 2, 25 (1955). 1355. Heat units and temperature scales for calorimetry, H. F. Stimson. Am. J. Phys.

23, 614 (1955). 1356. High precision automatic frequency comparator and recorder, J. M. Shaull. Tele- Tech

14, No. 1, 58 (1955). 1357. High-speed computation of ideal gas thermodynamic functions. II. The diatomic

free radicals of the isotopic hydrides of oxygen

and sulphur, L. Haar and A. S. Friedman.

J. Chem. Phys. 23, No. 5, 869 (1955). 1358. High- stability bridge-balancing oscillator, P. G. Sulzer. Proc. IRE 43, 701 (1955). 1359. High- stability frequency standards, P. G. Sulzer. Tele-Tech 14, No. 6, 108 (1955). 1360. How to solve a linear programming prob- lem, A. J. Hoffman. Proc. of Second Symp.

Linear Programming, held jointly by NBS and

the USAF, 397 (Dept. of Defense) (1955).

1361. Hysteresis effect in multiplier phototube

noise, C. A. Ziegler and H. H. Seliger. J. Appl. Phys. 26, No. 10, 1225 (1955). 1362. Improved Hepp-Scatchard osmometer,

F. R. McCann and S. Rothman. J. Polymer

Sci. 18, 151 (1955). 1363. Indentation pressure of a smooth circular punch, E. Levin. Quart. Appl. Math. 13, No.

2, 133 (1955). 1364. Information theory aspects of propagation through time- varying media, J. Feinstein.

J. Appl. Phys. 26, 219 (1955). 1365. Infrared absorption spectrum of n-dimethyl-amino-diborane, J. E. Stewart. J. Chem.

Phys. 23, No. 11, 2204 (1955). 1366. Infrared flame spectra, E. K. Plyler. Microchim. Acta 2-3, 421 (1955). 1367. Infrared measurements , past and present, E. K. Plyler. J. Franklin Inst. 259, No. 1, 17 (1955). 1368. Inner bremsstrahlung from V , R. W. Hayward and D. D. Hoppes. Bull. Am. Phys.

Soc. 30, No. 3, 59A(1955).

13 69. Instrument for measuring the marginal power of spectacle lenses, F. E. Washer. J. Opt. Soc. Am. 45, No. 9, 719 (1955). 1370. Instrumentation and automation, W. A. Wildhack. Science 122, 1146 (1955). 1371. Instrumentation and the future of mankind, W. A. Wildhack. Instr. Soc. Am. J. 2, No. 9, 430 (1955). 1372. Instrumentation research at the National Bureau of Standards, W. A. Wildhack. Ann.

N. Y. Acad. Sci. 60, 809 (1955). 1373. Interference patterns in reverberant sound fields, R. V. Waterhouse. J. Acoust.

Soc. Am. 27, 247 (1955). 1374. Internal rotation in methyltrifluoro- methyl acetylene, D. R. Lide, Jr. and D. Kivelson. J. Chem. Phys. 23, 2191 (1955). 1375. International methods for testing color- fastness of textiles, W. D. Appel. Mag. of Standards 26, No. 2, 44 (1955). 1376. International plastic committee considers standard tests, G. M. Kline. Mag. of Stand- ards 26, No. 10, 305 (1955). 1377. Investigation of homogeneity of six pro- posed NBS-GMC zinc-base spectrographic

standards, R. E. Michaelis. General Motors

Spectrographic Committee Special Publication

(1955). 1378. Investigations of the properties of cor- rugated diaphragms, W. A. Wildhack, R. F. Dressier, and E. C. Lloyd. Am. Soc. Mech.

Engrs. preprint 55- A- 181 (1955). 1379. Ion- atom interchange in air, R. F. Potter. J. Chem. Phys. 23, No. 12, 2462 (1955). 1380. Ionization chambers for radiation data during dental X-ray exposure, D. C. Hudson

and J. W. Kumpula. U. S. Armed Forces Med.

J. 6, No. 8, 1131 (1955). 1381. Isotope analysis using dimethylmercury,

V. H. Dibeler. Anal. Chem. 27, 1958 (1955). 1382. Kinetics of crystallization in polymers.

II. Polymer- diluent mixtures, L. Mandelkern.

J. Appl. Phys. 26, 443 (1955). 1383. Kleine Bemerkung zur asymptotischen

Entwicklung des Fehlerintegrals , P. Henrici.

Z. angew. Math, u Phys. (Basil, Switzerland)

6, 145 (1955).

110
1955

1384. Rebuttal to comments on "Large reduction of VHF transmission loss and fading by the presence of a mountain obstacle in beyond- lineof- sight paths, " by F. H. Dickson, J. J. Egli,

J. W. Herbstreit and G. S. Wickizer. (Proc. IRE 41, 967 (1953)), by J. H. Crysdale, by J. W. Herbstreit, F. H. Dickson, J. J. Egli and

G. S. Wickizer. Proc. IRE 43, 627 (1955). 1385. Least pth power polynomials on a real

finite point set, T. S. Motzkin and J. L. Walsh. Am. Math. Soc. 78, No. 1, 67 (1955). 1386. Light scattering and micelle structure in . the system sodium dodecyl sulfate- sodium

chloride- water, L. M. Kushner and W. D. Hubbard. J. Colloid Sci. 10, No. 4, 428 (1955). 1387. Light waves and length standards, I. C. Gardner. J. Opt. Soc. Am. 45, No. 9, 685

(1955). 1388. Limitations on rapid signal analysis, E. L. R. Corliss. J. Wash. Acad. Sci. 45, No. 11, 359 (1955). 1389. Lindeck potentiometer, D. W. Oliver. Rev. Sci. Instr. 26, No. 11, 1078 (1955). 1390. Lithium: heat content from 0° to 900°,

triple point and heat of fusion, and thermo- dynamic properties of the solid and liquid, T. B. Douglas, L. F. Epstein, J. L. Dever, and W. H. Howland. J. Am. Chem. Soc. 77, 2144

(1955). 1391. Low- capacitance power supply, J. Reaves.

Radio- Electronic Eng. 24, No. 6, 16 (1955). 1392. Low temperature scales from 90° to 5°K, R. B. Scott. Am. Inst. Phys. Temperatures,

its Measurement and Control in Science and In- dustry 2, 179 (Reinhold Publ. Corp. , New York

York, N. Y. ) (1955). 1393. Low- temperature thermal conductivity of a free- machining copper, R. L. Powell and D.

O. Coffin. Rev. Sci. Instr. 26, 516 (1955). 1394. Macromolecular chemistry, S. L. Madorsky. Science 121, 81 (1955). 1395. Magnetic cooling, E. Ambler and R. P. Hudson. Published in Reports on Progress in Physics, Proc. British Phys. Soc. (London,

England) 18, 251 (1955). 139 6. Magnetic susceptibilities of some U(IV) compounds, C. A. Hutchison, Jr. , and C. M.

Herzfeld. J. Chem. Phys. 23, 1650 (1955). 1397. Manganese thermal neutron activation cross section, J. A. DeJuren and J. Chin. Phys. Rev. 99, No. 1, 191 (1955). 1398. Unassigned.

1399. Measurement of correlation coefficients

in reverberant sound fields, R. K. Cook, R. V. Waterhouse, R. D. Berendt, S. Edelman, and M. C. Thompson, Jr. J. Acoust. Soc. Am.

27, No. 6, 1072 (1955). 1400. Measurement of the effect of two-dimensional and three-dimensional roughness ele- ments on boundary- layer transition, P. S. Klebanoff, G. B. Schubauer, and K. D. Tid- strom. J. Aeronaut. Sci. 22, 11 (1955). 1401. Measurements of correlation, height gain, and path antenna gain at 1046 Mc on spaced an- tennas far beyond the radio horizon, A. F. Barghausen, M. T. Decker and L. J. Maloney. IRE Conv. Record 3, Pt. 1, 78 (1955).

1402. Measurement of the phase of radio waves

received over transmission paths with electrical lengths varying as a result of atmospheric

turbulence, J. W. Herbstreit and M. C. Thompson, Jr. URSI Symp. on Electromagnetic Wave

Theory, June 1955 (Ann Arbor, Mich.); Proc. IRE 43, 1391 (1955). 1403. Measurements on the saturation vapour pressure of liquid helium in the range 1.4°- 4.2°K, E. Ambler and R. P. Hudson. Bull. Intern. Inst. Refrig. , Commun. 147, 605 (1955). 1404. Mechanical impedance of the forehead and

mastoid, E. L. R. Corliss and W. Koidan.

J. Acoust. Soc. Am. 27, No. 6, 1164 (1955). 1405. Mechanism of hygroscopic expansion of dental casting investments, H. W. Lyon, G. Dickson, and I. C. Schoonover. J. Dental Research 34, 44 (1955). 1406. Mechanisms of alkali- aggregate reaction, R. G. Pike, D. Hubbard, and H. Insley. J. Am.

Concrete Inst. 27, No. 1, 13 (1955). 1407. Method for restoring original appearance

of impregnated leather, J. H. Davis and R. Oehler. J. Am. Leather Chemists Assoc. 50, 38 (1955). 1408. Mircowave absorption in compressed

oxygen, A. A. Maryott and G. Birnbaum. Phys.

Rev. 99, 1886 (1955). 1409. Mooney viscometer cure characteristics

of Hevea rubber, G. E. Decker and J. Mandel. ASTM Bull. No. 209, 47 (1955). 1410. Motivation for working in numerical anal- ysis, J. Todd. Commun. on Pure and Appl. Math. 8, No. 1, 97 (1955). 1411. Multistage autoignition of engine fuels, W. J. Levedahl. Fifth Symposium (Inter- national) on Combustion (Reinhold Pub. Corp. , New York, N. Y. ) p. 372 (1955). 1412. National Bureau of Standards preferred

circuits program, J. H. Muncy. Elec. Eng.

74, No. 12, 1088 (1955). 1412A. Natural and synthetic rubbers. Biennial review of physical and chemical test methods,

N. Bekkedahl and M. Tryon. Anal. Chem. 27, 589 (1955). 1413. Negative oxygen ions in the upper atmosphere: The affinity and radiative attachment

coefficient of atomic oxygen, L. M. Branscomb

and S. J. Smith. Trans. Am. Geophys. Union

36, 5, 755 (1955). 1414. New method of recording the sound trans- mission loss of walls as a continuous function of frequency, R. V. Waterhouse and R. K. Cook.

J. Acoust. Soc. Am. 27, No. 5, 967 (1955). 1415. New techniques for fabrication of airborne

electronic equipment, R. K-F. Seal. Proc. IRE

43, No. 1, 4 (1955). 1416. Nightglow heights: a re interpretation of old data, F. E. Roach and A. B. Meinel. Astrophys. J. 3, 554 (1955). 141 6A. Noise in composition resistors, G. T. Conrad, Jr. Proc. Natl. Electronics Conf. Electronics Conf. Yearbook 10, 1 (1955). 1417. Noise measurements of composition resistors. I. The method and equipment. II. Characteristics and comparison of resistors, G. T. Conrad, Jr. IRE Trans, on Component

Parts CP4, 61 (1955).

Ill
1418. Nonlinear theory of space- charge wave

in moving, interacting electron beams with

application to solar radio noise, H. K. Sen. Phys. Rev. 97, 849 (1955). 1419. Nonlinear viscoelastic behavior of rub- ber in shear, H. Leaderman. J. Polymer

Sci. 16, No. 82, 261 (1955). 22?

1420. Nuclear moments of Ac , M. Fred,

F. S. Tomkins, and W. F. Meggers. Phys. Rev. 98, 1514 (1955). 1421. Observations of distant meteor-trail echoes followed by ground scatter, W. L. Hartsfield. J. Geophys. Research 60, 53

(1955). 1422. Oil- soaked felt- pad lubrication of ball bearings at high speed and high temperature,

H. S. White, J. F. Swindells, and H. V. Belcher. Lubrication Eng. 11, 182 (1955). 1423. On a problem in the theory of mechanical quadratures, P. Davis. Pacific J. Math.

5, Suppl. 1, 669 (1955). 1424. On certain series expansions involving Whittaker functions and Jacobi polynomials,

P. Henrici. Pacific J. Math. 5, Suppl. 1, 725 (1955). 1425. On eigenvalues of sums of normal matrices, H. Wielandt. Pacific J. Math 5, 633

(1955). 1426. On generating functions of the Jacobi polynomials, P. Henrici. Pacific J. Math. - 5, Suppl. 2, 923 (1955). 1427. On helical springs of finite thickness,

P. Henrici. Quart. Appl. Math. 13, No. 1, 106 (1955). 1428. On moments of order statistics from the Weibull distribution, J. Lieblein. Ann. Math.

Stat. 26, No. 2, 330 (1955). 1429. On non-linear differential equations of

the second order with integrable forcing term,

H. A. Antosiewicz. J. London Math. Soc.

30, 65 (1955). 1430. On power spectra and the minimum

detectable signal in measurement systems,

J. J. Freeman. J. Appl. Phys. 26, 236 (1955). 1431. On the dependence of the constants in the Curie- "Weiss law on exchange, C. M. Herzfeld.

J. Chem. Phys. 23, 398 (1955). 1432. On the design of two-dimensional nozzles by the method of characteristics, B. Chaix and

P. Henrici. J. Aeronaut. Sci. 22, 140 (1955). 1433. On the kinetics of elementary gas phase

reactions at high temperatures, K. E. Shuler.

Fifth Symposium (International) on Combustion (Reinhold Pub. Corp. , New York, N. Y. ) p. 56 (1955). 1434. On the origin of the electronically excited C? radical in hydrocarbon flames, R. E. Ferguson. J. Chem. Phys. 23, 2085 (1955). 1435. On the vibration of a square clamped

plate, M. Abramowitz and W. F. Cahill. J. Assoc. Computing Machinery 2, No. 3, 162

(1955). 1436. Optical properties of cesium iodide, W. S. Rodney. J. Opt. Soc. Am. 45, No. 11, 987 (1955). 1437. Oxidation studies of some natural graphites, R. A. Heindl and N. F. Mohler. J. Am.

Ceram. Soc. 38, No. 3, 89 (1955).

1438. Oxygen chemisorption on carbon adsorbents, W. V. Loebenstein and V. R. Deitz. J. Phys. Chem. 59, 481 (1955). 1439. Oxygen quenching and wavelength shifters

in liquid scintillators, C. A. Ziegler, H. H.

Seliger, and I. Jaffe. Phys. Rev. 99, No. 2, 663 (1955); Bull. Am. Phys. Soc. 30, No. 3, 63A (1955). 1440. Pairs of matrices with property L. H,

T. S. Motzkin and O. Taussky. Trans. Am.

Math. Soc. 80, No. 2, 387 (1955). 1441. Paper milk containers, M. W. Jensen.

Scale J. 41, No. 12, 5 (1955). 1442. Partially replicated latin squares, "W. J. Youden and J. S. Hunter. Biometrics 11, 399

(1955). 1443. Permissible exposure to ionizing radiation, L. S. Taylor. Proc. of Intern. Conf. on

Peaceful Uses of Atomic Energy (Geneva,

Switzerland) (1955). 1444. Photoeffects in intermetallic compounds,

H. P. R. Frederikse and R. F. Blunt. Proc. IRE 43, 1828 (1955). 1445. Physical characteristics of titanium carbide type cermets at elevated temperatures,

F. P. Knudsen, R. F. Geller, and R. E. Moreland. J. Am. Ceram. Soc. 38, No. 9, 312

(1955). 1445A. Physical mathematics, C. H. Page.

(D. Van Nostrand Co. , Inc. New York, N. Y.

(1955). 1446. Physiological monitor for anesthesia,

S. R. Gilford and H. P. Broida. Electronics

28, No. 10, 130 (1955). 1447. Plating standards and specifications, F. Ogburn. Electroplating Eng. Handbook, Chapter 7 (Reinhold Pub. Corp. New York, N. Y.

(1955). 1448. Polarization energy for 3d and 4p electrons, R. E. Trees. Phys. Rev. 97, 686 (1955). 1449. Pores in collagen and leather, R. R. Stromberg and M. Swerdlow. J. Am. Leather Chemists Assoc. 50, No. 7, 336 (1955). 1450. Portable potentiometer and thermostated

containers for standard cells, F. L. Hermach

and A. W. Spinks. Rev. Sci. Instr. 26, 770

(1955). 1451. Potassium iodide fast neutron detector,

B. Brown. Rev. Sci. Instr. 26, 970 (1955). 1452. Practical test methods for the Porcelain Enameling Industry, J. R. Giles. Proc. Porcelain Enamel Inst. Forum 17, 55 (1955). 1453. Precision 5- 10 kv high- voltage supply,

L. Costrell. Nucleonics 13, No. 3, 63 (1955). 1454. Preferred orientation in stark rubber

studied with an automatic integrating pole- figure goniometer, C. J. Newton, L. Mandelkern, and

D. E. Roberts. J. Appl. Phys. 26, No. 12, 1521 (1955). 1455. Preparation and maintenance of radioactive standards by the National Bureau of Stand- ards, W. B. Mann. Acta Radiol. Suppl. 117, 50 (1955). 1456. Pressure drop in pneumatic components

and systems, M. M. Slawsky, M. Lutsky, and

A. E. Schneidlin. Product Eng. Handbook No.

3, Section J, p. J2 (McGraw-Hill Book Co. , Inc., New York, N. Y. ) (1955).

112
1457. Problems arising in engineering investi- gations, W. J. Youden. Proc. 1st Annual

Statistical Engineering Symposium, held by the Chemical Corps Engineering Agency at Army

Chemical Center, Md. , 60 (1955). 1458. Proceedings of the Second Symposium in Linear Programming, held jointly by the National Bureau of Standards and the United States Air Force (January, 1955). 1459. Progress in metal cleaning and finishing, A. Brenner. Metal Progr. 68, No. 3, 113

(1955). 1459A. Progress report by Committee of Optical Society of America on uniform color scales, D. B. Judd. J. Opt. Soc. Am. 45, 673 (1955). 1460. Properties of Mg,Sn, R. F. Blunt, H. P. R. Frederikse, and W. Tt. Hosier. Phys. Rev.

98, 1533A (1955). 1461. Properties of pore conductors, R. For- man. J. Appl. Phys. 26, No. 9, 1187 (1955). 1462. Protection in the use of dental roentgenographic equipment, S. W. Smith. J. Am. Dental Assoc. 51, 12 (1955). 1463. Protection of low- strategic alloys with a chromium boride- nickel cermet coating, D. G. Moore and J. R. Cuthill. Am. Ceram. Soc.

Bull. 34, 11 (1955).

1464. Pyrolysis of a and /3 deuterostyrene polymers, L. A. Wall, D. W. Brown, and V. E.

Hart. J. Polymer Sci. 15, No. 79, 157 (1955). 1465. Pyrophosphate formation upon ignition of precipitated basic calcium phosphates, A. Gee

and V. R. Deitz. J. Am. Chem. Soc. 77, 2961

(1955). 1466. Pulp and paper (Annual Review) R. B. Hobbs and W. K. Wilson. Chem. Eng. News

33, 114 (1955). 1467. Radiation protection in therapeutic radi- ology, H. O. Wyckoff. Am. J. Roentgenol. Radium Therapy Nuclear Med. 73, 655 (1955). 1468. Radio observations (al-CM) of dense dark

nebulae, B. J. Bok, R. S. Lawrence and T. K. Menon. Pubis. Astron. Soc. Pacific 67, No.

395, 108 (1955). 1469. Radio transmission at VHF by scattering and other processes in the lower ionosphere,

D. K. Bailey, R. Bateman, and R. C. Kirby. Proc. IRE 43, No. 10, 1181 (1955). 1470. Radio transmission loss vs distance and

antenna height at 100 Mc, P. L. Rice and F. T. Daniel. IRE Trans. Ant. Prop. AP-3, 59 (1955). 1471. Radioactivity of In 117 and Sb 117

, C. L. McGinnis. Phys. Rev. 97, 93 (1955). 1472. Rate of thermal diffusion of polymer molecules in solution, J. D. Hoffman and B.' H. Zimm. J. Polymer Sci. 15, 405 (1955). 1473. Reaction of sodium chlorite with some al- doses and modified celluloses, W. K. Wilson and

A. A. Padgett. Tappi 38, 292 (1955). 1474. Reagent chemicals, E. Wichers. American Chemical Society Specifications, 1955. Prepared by the Comm. on Analytical Reagents,

published by Am. Chem. Soc. (1955). 1475. Reference samples of isotopic abundance,

F. L. Mohler. Science 122, No. 3164, 334

( 1955). 1476. Relationships of dental materials to clin- ical subjects, R. J. Nelson. J. Dental Education 19, 62 (1955).

1477. Report on International Standards Organization Technical Committee 61, G. M. Kline. Mag. of Standards 26, No. 2, 47 (1955). 1478. Report on the Second revision of Rowland's table of solar wavelengths. Proc. Rydberg Centennial Conf. , Lunds Universitets (Lund, Sweden), Arsskrift N. F. and 2, 50, No. 21, 104 (1955). 1479. Residual lattice strains in sectioned bars

of plastically deformed iron, C. J. Newton and

H. C. Vacher. J. Metals 7, No. 11, 1193

(1955). 1480. Resume of dental research, G. C. Paf- fenbarger. J. Am. College Dentists 22, 21 (1955). 1481. Safety color codes, H. J. Keegan.

Inter- Society Color Council News Letter No.

121, 10 (1955). 1482. Scattering at oblique incidence from

ionospheric irregularities; summary of an infor- mal talk, D. K. Bailey. In the physics of the ionosphere; report of the Physical Society Conference on the physics of the ionosphere, held

at the Cavendish Laboratory, Cambridge, Sep- tember 1954) p. 99 (The Physical Society, London, England) (1955). 1483. Science in radiology, L. S. Taylor. Radiology 64, 429 (1955). 1484. Scintillation crystal- TV device X-rays

objects in motion, J. S. Pruitt. Nucleonics

13, No. 8, 26 (1955). 1485. Significance of the results of some physical tests on upper leather, J. R. Kanagy. J. Am. Leather Chemists Assoc. 50, No. 3, 112

(1955). 1486. Silver electrode, C. L. Gordon. Anal. Chem. 27, No. 9, 1508 (1955). 1487. Simple humidity lag apparatus, S. Hasegawa, S. B. Garfinkel, and A. Wexler. Rev.

Sci. Instr. 26, No. 12, 1196 (1955). 1488. Small grating spectrometer for the far infrared region, E. K. Plyler and N. Acquista.

J. Chem. Phys. 23, 752 (1955). 1489. Solar H&filaments and geomagnetic dis- turbances, H. I. Leighton and D. E. Billings.

J. Atmospheric and Terrest. Phys. 7, 349

(1955). 1490. Solar radio astronomy at the National Bureau of Standards. In Proc. 7th Western Amateur Astronomers' Convention (Yosemite,

California) 13, (1955). 1491. Some aspects of the large scale lique- faction of hydrogen, B. W. Birmingham. Proc.

Instr. Soc. Am. Paper 55-2-1, 10, Pt. 2, 1 (1955). 1492. Some developments in vibration measurement, S. Edelman, E. Jones, and E. R. Smith.

J. Acoust. Soc. Am. 27, 728 (1955). 1493. Some factors affecting the dimensional

stability of the Ag-Sn (Cu- Zn) amalgams, J. A.

Mitchell, I. C. Schoonover, G. Dickson, and

H. C. Vacher. J. Dental Research 34, No. 2, 273 (1955). 1494. Some factors influencing the cutting characteristics of rotating dental cutting instruments,

D. C. Hudson, J. L. Hartley, R. B. Moore, and W. T. Sweeney. J. Am. Dental Assoc. 50, 377

(1955).

113
1955

1495. Some fading characteristics of regular VHF ionospheric propagation, G. R. Sugar. Proc. IRE 43, No. 10, 1432 (1955). 1496. Some inequalities concerning positivedefinite Hermitian matrices, K. Fan. Proc. Cambridge Phil. Soc. 51, 414 (1955). 1497. Some metric inequalities in the space of matrices, K. Fan and A. J. Hoffman. Proc. Am. Math. Soc. 6, No. 1, 111 (1955). 1498. Some results of a sweep- frequency propagation experiment over an 1150- KM east-west

path, B. Wieder. J. Geophys. Research 60, 395 (1955). 1499. Some tropospheric scatter propagation measurements near the radio horizon, H. B. Janes and P. I. Wells. Proc. IRE 43, 1336

(1955). 1500. Sorption of macromolecules to solid surfaces: sorption of dextran to cellulose nitrate membranes in the presence of serum albumin

and surface- active agents, S. Rothman, J. Mandel, F. R. McCann, and S. G. Weissberg.

J. Colloid Sci. 10, No. 4, 338 (1955). 1501. Sources of transport coefficients and

correlations of thermodynamic and transport

data, J. Hilsenrath. Second AGARD Combustion Colloquium, Liege, Belgium (1955). 1502. Specific heats of collagen and leather,

J. R. Kanagy. J. Am. Leather Chemists Assoc.

50, No. 10, 444 (1955). 1503. Spectroscopic determination of the dissociation energy of the OH radical, G. A. Hornbeck.

Fifth Symp. (International) on Combustion (Rein- hold Pub. Corp., New York, N. Y. ) 790 (1955). 1504. Spectroscopy, W. F. Meggers. Encyclopedia Brittanica 21, 180 (1955). 1505. Standard natural rubber, R. D. Stiehler and F. L. Roth. Rubber Age 78, 77 (19 55). 1506. Standard test for photoflash cells, H. J. DeWane, Mag. of Standards 26, No. 5, 135

(1955). 1507. Standards at the National Bureau of Stand- ards, W. J. Hamer. Yale Sci. Mag. 30, No.

2, 7 (1955). 1508. Standards for electronics, A. V. Astin. Proc. National Electronics Conference (Chicago,

111.) 11, 1 (1955). 1509. Standards for plastics, G. M. Kline. Chap, in Plastics in Building 95, Advances in Chemistry Series 10, 145 (1955). 1510. Stark effect, W. F. Meggers. Encyclopedia Br ittanica 2 1 , 334 (1955). 1511. Statistical principles of testing. J. Mandel. Ind. Quality Control 12, 18 (1955). 1512. Statistics- -A tool in testing rubber, J. Mandel and R. D. Stiehler. ASTM Bull. No.

204, 44 (1955). 1513. Stress corrosion cracking of a gold wedding ring, F. M. Reinhart. Corrosion 11, 503t

(1955). 1514. Stress- strain relationships in yarns sub- jected to rapid impact loading, H. F. Schiefer,

J. C. Smith, F. L. McCrackin, and W. K.

Stone. Am. Soc. Testing Materials Spec. Tech.

Publ. 176, "Symposium on Impact Testing",

126 (1955).

1515. Stress- strain relationships in yarns sub- jected to rapid impact loading. Part I. Equip- ment, testing procedure, and typical results, W. K. Stone, H. F. Schiefer, and G. Fox.

Textile Research J. 25, 520 (1955). 1516. Stress- strain relationships in yarns subjected to rapid impact loading. III. Effect of wave propagation, J. C. Smith, F. L. Mc

Crackin, and H. F. Schiefer. Textile Research

J. 25, No. 8, 701 (1955). 1517. Structure theorems for modular sub- groups, M. Newman. Duke Math. J. 22, No.

1, 25 (1955). 1518. Studies of crystal growth, and electrical and optical properties of gray tin, J. H. Becker.

Phys. Rev. 98, 1192A(1955).

1519. Superconducting transitions in tin whiskers, O. S. Lutes and E. Maxwell. Phys. Rev.

97, No. 6, 1718 (1955). 1520. Sweep- frequency pulse- transmission measurements over a 2400- KM path, P. G. Sulzer. J. Geophys. Research 60, 483 (1955). 1521. Synthesis and properties of fluorinated polyphenyls, M. Hellmann, A. J. Bilbo, and W. J. Pummer. J. Am. Chem. Soc. 77, 3650

(1955). 1522. Synthetic textiles, W. D. Appel. Encyclopedia Americana, p. 732 (1955). 1523. Table of characteristic values of Mathieu's equation for large values of the parameter,

G. Blanch and I. Rhodes. J. Wash. Acad. Sci. 45, 166 (1955). 1524. / Teaching pay in the Soviet Union, L. S. Taylor. Letter to Editor Science Teacher 22, No. 6, 264 (1955). 1525. Tektites and the lost planet, R. Stair. Smithsonian Institution Annual Report No. 4194, 217 (Smithsonian Institution, Washington, D. C.

(1955). 1526. Temperature control during mixing of rubber compounds, F. L. Roth, G. E. Decker,

and R. D. Stiehler. Rubber World 132, 482

(1955). 1527. Temperature dependence of mechanical

shear degradation, P. Goodman and A. B.

Bestul. J. Polymer Sci. 18, No. 88, 235

(1955). 1528. Temperatures in atomic explosions, F. G. Brickwedde. Temperature, Its Measurement

and Control in Science and Industry (Reinhold Pub. Co., New York, N. Y. ) 2, 395 (1955). 1529. Textiles at the National Bureau of Stand- ards, W. D. Appel. Proc. Am. Assoc. Textile Chemists Colorists 44, No. 23, 795 (1955). 1530. The behavior of long helical springs under

fluctuating load, C. L. Staugaitis and H. C. Burnett. ASTM Bull. 55, 918 (1955). 1531. The effect of an anodic (HAE) coating on

the fatigue strength of magnesium alloy speci- mens, J. A. Bennett. ASTM Bull. 55, 1015

(1955). 1532. The generation of Coulomb wave functions by means of recurrence relations, I. A. Stegun and M. Abramowitz. Phys. Rev. 98, 1851

(1955). 1533. The heat of formation of tetr afluoromethane, R. S. Jessup and R. E. McCoskey and R.

A. Nelson. J. Am. Chem. Soc. 77, 244 (1955).

114
19 1534. The height of the nightglow by the van

Rhijn method, F. E. Roach and A. B. Meinel. Astrophys. J. 122, No. 3, 530 (1955). 1535. The helium vapor-pressure scale of temperature, R. P. Hudson. Temperature, Its Measurement and Control in Science and Industry (Reinhold Pub. Co. , New York, N. Y. ) 2, 185 (1955). 153 6. The interconnection of two digital computers, M. E. Stevens. Am. Inst. Elec. Engrs.

Fall General Meeting, CP55-736 (Chicago,

111. ) (1955). 1537. The ionosphere, T. N. Gautier. Sci. American 193, No. 3, 126 (1955). 1538. The mechanisms of material transport during sintering, R. F. Walker. J. Am. Ceram.

Soc. 38, No. 6, 187 (1955). 1539. The National Bureau of Standards' 1000-

lb balance, H. H. Russell. The Scale J. 41, No. 11, 6 (1955). 1540. Unassigned.

1541. The probability distribution of the amplitude of a constant vector plus a Rayleigh- dis- tributed vector, K. A. Norton, L. E. Vogler, W. V. Mansfield, and P. J. Short. Proc. IRE

43, 1354 (1955). 1542. The rate of fading in propagation through

a turbulent atmosphere, K. A. Norton, P. L. Rice, H. B. Janes, and A. P. Barsis. Proc. IRE 43, 1341 (1955). 1543. The relation between the absorption

spectra and the chemical constitution of dyes. XXVIIL The hydration of Azo dyes in organic

solvents, W. R. Brode, I. L. Seldin, P. E. Spoerri, and G. M. Wyman. J. Am. Chem.

Soc. 77, 2762 (1955). 1544. The scatter propagation issue, K. A. Norton and J. B. Wiesner. Introduction to the special issue of Proc. IRE. Proc. IRE 43, 1181 (1955). 1545. The spectral radiant energy from the sun through varying degrees of smog at Los Angeles,

R. Stair. Proc. 3d National Air Pollution Symposium (Los Angeles, California) (1955). 1546. The spectral-transmissive properties of plastics for use in eye protection, R. Stair. Am. Standards Assoc. Special Issue (New

York, N. Y. ) (1955). 1547. The spectral-transmissive properties of

the tektites, R. Stair. Geochim, et Cosmochim.

(Pergamon Press, New York, N. Y. ) 7, 43

(1955). 1548. The theory of electronpenetration, L. V. Spencer. Phys. Rev. 98, 1597 (1955). 1549. Unassigned.

1550. The use of angular distance in estimating transmission loss and fading range for propagation through a turbulent atmosphere over ir- regular terrain, K. A. Norton, P. L. Rice, and

L. E. Vogler. Proc. IRE 43, 1488 (1955). 1551. The use of cesium iodide prisms to 50 microns, E. K. Plyler and N. Acquista. N. 3 del Supplemento al Vol. 2, Serie X, II Nuovo

Cimento, p. 629 (Bologna, Italy) (1955). 1552. Unassigned.

1553. Unassigned.

15 54. Theory of dielectric relaxation for a

single- axis rotator in a crystalline field, II. , J. D. Hoffman. J. Chem. Phys. 23, No. 7, 1331 (1955).

1555. Thermal and gravitational excitation of atmospheric oscillations, H. K. Sen and M. L. White. J. Geophys. Research 60, No. 4, 483

(1955). 1556. Thermal decomposition of polymers, L. A. Wall. Chem. Corps Report, Report of Symposium VII, Incendiary Gels and Their In- strumentation, p. 103 (1955). 1557. Thermal degradation of polymers as a

function of molecular structure and branching,

S. L. Madorsky and S. Straus. Consiglio Nazionale Delle Ricerche (Rome, Italy) 25, 3 (1955). 1558. Thermodynamics of crystallization in high polymers: natural rubber, D. E. Roberts

and L. Mandelkern. J. Am. Chem. Soc. 77, 781 (1955). 1559. Thermoelectric power of indium antimonide, H. P. R. Frederikse and E. V. Mielczarek. Phys. Rev. 99, 1889 (1955). 1560. Transmission of positrons and electrons, H. H. Seliger. Phys. Rev. 100, No. 4, 1029

(1955). 1561. Transmittance of infrared energy by

glasses, F. W. Glaze. Am. Ceram. Soc. Bull.

34, No. 9, 291 (1955). 1562. Treatment of liquid He based on the "cell" model, H. N. V. Temperley. Phys. Rev. 97, 835 (1955). 1563. Uber pH-Werte nichtwas seriger Losungen, R. G. Bates and G. Schwarzenbach.

Helv. Chim. Acta (Basil, Switzerland) 38, 699

(1955). 1564. Ultrasonic switch aids diversity reception,

G. F. Montgomery. Electronics 28, No. 11, 1169 (1955). 1565. Ultraviolet spectrophotometry of low

pressure explosions, G. J. Minkoff, A. J. Everett, and H. P. Broida. Fifth (Inter- national) Symposium on Combustion (Reinhold Pub. Corp., New York, N. Y. ) p. 779 (1955). 1566. Understressing as a means of eliminating

the damaging effect of fatigue stressing, H. E. Frankel and J. A. Bennett. ASTM Bull. 55, 891 (1955). 1567. Unimodular integral circulants, O. Taussky. Math. Zeitschr (Berlin, Germany)

63, 286 (1955). 1568. Unsolved problems in review, A. T. McPherson. ASTM Bull. No. 210, p. 12 (1955). 1569. Use of partially oriented solid samples

and unpolarized radiant energy in the analysis

of infrared absorption spectra, J. E. Stewart.

J. Chem. Phys. 23, No. 5, 986 (1955). 1570. Valve for cold fluids, R. J. Richards

and R. B. Jacobs. Rev. Sci. Instr. 26, No. 7, 730 (1955). 1571. Variability of wool content in part wool

blankets, E. Horowitz and W. S. Connor. ASTM Bull. No. 208, 42 (1955). 1572. Variation in distortion with magnification,

A. A. Magill. J. Opt. Soc. Am. 45, No. 3, 148 (1955). 1573. Variations in preferred orientation and modulus of elasticity in cold drawn music spring wire, H. C. Burnett and C. J. Newton. Wire

and Wire Products 30, No. 11, 1375 (1955).

115
1955

1574. Velocity of light from the molecular constants of carbon monoxide, E. K. Plyler, L. R.

Blaine, and W. S. Connor. J. Opt. Soc. Am.

45, No. 2, 102 (1955). 1575. Vibrational energy of deuterium cyanide,

H. C. Allen, Jr. , E. D. Tidwell, and E. K.

Plyler. J. Chem. Phys. 23, No. 7, 1356 (1955). 1576. Vibrational spectrum of 1- fluoro- 1- chloroethylene, E. K. Plyler, D. E. Mann, and N. Acquista. J. Chem. Phys. 23, 2122 (1955). 1577. Vibrational spectrum of fluorotrichloroethylene, D. E. Mann and E. K. Plyler. J. Chem. Phys. 23, No. 11, 1989 (1955). 1578. "Weather ability of porcelain enamels, D.

G. Moore. Proc. of Conf. Architectural Porcelain Enamel, Auspices of Architectural

Division- Porcelain Enamel Institute, p. 39 (1955).

1579. Weathering of porcelain enamel, D. G. Moore. Proc. Porcelain Enamel Inst. 17, 136

(1955). 1580. Weights and measures approval seals, M. W. Jensen. Scale J. 41, No. 5, 2 (1955). 1581. World unification of screw threads, I. H. Fullmer. Mag. of Standards 26, No. 10, 306

(1955). 1582. X- ray attenuation in lead, aluminum, and

concrete in the range 275 to 525 kilovolts, W.

Miller and R. J. Kennedy. Radiology 65, No.

6, 920 (1955). 1583. X-ray diffraction studies of tooth struct- ures, A. S. Posner. Norelco Reptr. 2, 26

(1955). 1584. Zeeman effect. W. F. Meggers.

Encyclopedia Brittanica 23, 940 (1955).

116
1956 1584A. A bend- test method of determining the stress required to cause creep in tension, J. B. Wachtman, Jr. , and L. H. Maxwell. ASTM

Bull. 211, 38 (1956). 1585. A brief look at the history of automation,

A. V. Astin. Signal 10, No. 4, 44 (1956). 1586. A comparison of the annual mean solar and lunar atmospheric tides in barometric

pressure, as regards to their worldwide

distribution of amplitude and phase, S. Chapman.

J. Atmospheric and Terrest. Phys. 8, 1 (1956). 1587. A configuration of taillights and brakelights, F. C. Breckenridge. Reports of Night

Visibility Committee, Highway Research Board Bui. 146, p. 56 (1956). 1588. A direct approach to the problem of

stability in the numerical solution of partial

differential equations, J. Todd. Comm. Pure

Appl. Math. 9, No. 3, 597 (1956). 1589. A frequency standard at low temperatures, W. D. George. Proc. 10th Ann. Symp. on Frequency Control. Signal Corps Engineering

Laboratories, p. 197 (May 1956). 1590. A function generator for two independent

variables, L. Taback. Control Eng. 3, No. 11, 129 (1956).

1591. A high energy electron- nuclear scattering, H. Mendlowitz. Phys. Rev. 102, No. 2, 527

(1956). 1592. A method for determining rate equation

for reactions in which the concentration of the reactant is unknown, J. H. Flynn. J. Phys. Chem. 60, 1332 (1956). 1593. A method for measuring surface flammability of materials using a radiant energy source, A. F. Robertson, D. Gross,

and J. Loftus. Am. Soc. Testing Materials Proc. 56, 1437 (1956). 1594. A new technique for the measurement of microwave standing- wave ratios-, A. C. Mac- PhersonandD. M. Kerns. Proc. IRE 44, 1024 (19 56). 1595. A note on the normal distribution, S. Geisser. Ann. Math. Stat. 27, 858 (1956). 1596. A one-microsecond adder using one- megacycle circuitry, A. Weinberger and J. L. Smith. IRE Trans. Electronic Computers

EC-5, No. 2, 65 (1956).

1597. A paper chromatographic analysis for collagen and collagen derivatives, J. M.

Cassel. J. Am. Leather Chemists Assoc.

51, 223 (1956). 1598. A photometric unit for the airglow and

aurora, D. M. Hunten, F. E. Roach, and J. W. Chamberlain. J. Atmospheric and Terrest. Phys. 8, 345 (1956). 1599. A radioisotope study of the nickel dip, J. C. Richmond and H. B. Kirkpatrick. J. Am.

Ceram. Soc. 39, No. 2, 39 (1956). 1600. A study of magnetic maps of the sun, M.

B. Wood. Astrophys. J. 124, 447 (1956).

1601. A study of the impact properties of borontreated steels, S. J. Rosenberg and J. D. Grimsley. J. Iron and Steel Inst. 182, 278 (1956). 1602. A study of thermistor materials for use as temperature- sensing elements in the highvelocity exhaust gases of jet-type engines, G. F. Blackburn, P. D. Freeze, and F. R. Caldwell. Wright Air Devel. Ctr. Tech. Rept. (Ohio) p. 54, Suppl. 1 (19 56).

1603. A subroutine for computations with

rational numbers, P. Henrici. J. Assoc. Computing Machinery 3, No. 1, 6 (1956). 1604. A survey of the application of ceramics as vacuum tube envelopes, C. Marsden. Third Annual Meeting Tube Techniques Conf. (Advisory Group on Electron Tubes, New York, N. Y. ) (1956). 1605. A table of the coefficients of the powers of

7} (r), M. Newman. Koninkl. Ned. Akad. Wetenschap, Proc. 59, 2 (1956); Indag. Math. 18, 2 (1956). 1606. A theory of cavity ionization, L. V. Spencer. Cancer Yearbook (Yearbook Publishers, Chicago, 111.) p. 499 (1956). 1607. Abundance of free atoms in solid nitrogen condensed at 4. 2° K from a gas discharge, H.

P. Broida and O. S. Lutes. J. Chem. Phys.

24, No. 2, 484 (1956). 1608. Accelerating effect of aminos on polymerization of methyl methacrylate , G. M. Brauer,

R. M. Davenport, and W. C. Hansen. Modern

Plastics 34, No. 3, 153 (1956). 1609. Adsorption of gases and vapors on glass spheres. II. Two dimensional condensation of oxygen, J. L. Shereshefsky and C. E. Weir.

J. Phys. Chem. 60, 1162 (19 56). 1610. Algebraic equations satisfied by roots of natural numbers, E. G. Straus and O. Taussky.

Pacific J. Math. 6, 97 (1956).

1611. Alignment of three odd-A rare-earth

nuclei, E. Ambler, R. P. Hudson, and G. M. Temmer. Phys. Rev. 101, No. 1, 196 (1956). 1612. Alkaline solutions for pH control, R. G. Bates and V. E. Bower. Anal. Chem. 28, 1322

(1956).

1613. Alloys of gallium with powdered metals as possible replacement for dental amalgam, D. L. Smith, and H. J. Caul. J. Am. Dental Assoc.

53, 315 (1956).

1614. American Dental Association specifications

for dental materials, G. C. Paffenbarger and W. T. Sweeney. J. Am. Dental Assoc. 2d Edition (1956).

1615. An A-C bridge for the audio- frequency

range, B. L. Dunfee. Commun. and Electronics, Am. Inst. Elec. Engrs. No. 24, 123 (19 56). 1616. An analog computer for radioactive fallout prediction, H. K. Skramstad and J. H. Wright. Proc. Natl. Simulation Council (19 56). 1617. Unassigned.

1618. An application of the Monte Carlo method

to a problem in gamma- ray diffusion, M. J. Berger. Symp. Monte Carlo Methods

(John Wiley & Sons, Inc. , New York, N. Y. ) (1956).

1619. An eight decade logarithmic ohmmeter,

S. B. Garfinkel. J. Instr. Soc. Am. 3, No. 2, 54 (1956). 1620. An elasticity and dielectric loss of quartz, R. K. Cook and J. H. Wasilik. J. Appl. Phys.

27, No. 7, 836 (1956). 1621. An intercomparison of the roentgen stand- ards of Great Britain and USA, G. H. Aston and

F. H. Attix. Acta Radiol. 46, 747 (1956). 1622. An investigation of slot radiators in rectangular metal plates, D. G. Frood and J. R. Wait. Proc. Inst. Elec. Engrs. (London, England) 103, Pt. B. No. 7, 103 (1956).

117
19: 1623. Unassigned.

1624. Analysis of atomic spectra with electronic

digital computers, K. G. Kessler, S. B. Prusch,

and I. A. Stegun. J. Opt. Soc. Am. 46, No. 12, 1043 (1956). 1625. Analysis of the (0. 1) and (1.2) bands of the 2A- 2 7T system of CH, N. H. Kiess and H. P. Broida. Astrophys. J. 123, No. 1, 166 (1956). 1626. Analytical mass spectrometry, V. H. Dibeler. Org. Anal. 3, 387 (1956). 1627. Annual review of pulp and paper industry, R. B. Hobbs and W. T. Jones. Ind. Eng. Chem.

48, 111 (19 56). 1628. Apparatus for etching fine points under

controlled conditions, R. A. Schrack and R. C. Placious. Rev. Sci. Instr. 27, No. 6, 412

(1956). 1629. Apparatus for the direct determination of the dynamic bulk modulus, S. Edelman, J. E. McKinney, and R. S. Marvin. J. Appl. Phys.

27, 425 (1956). 1630. Application of low Mu triodes to series regulator circuits, S. Rubin. Trans, of RETMA

Symp. (1956).

1631. Applications of standards of radioactivity, H. H. Seliger. Intern. J. Appl. Radiation and

Isotopes 1, 215 (1956). 1632. Approximate theory on the stability of interfacial waves between two streams, C. M.

Tchen. J. Appl. Phys. 27, No. il, 1533 (1956). 163 3. Arc- lengths along the lines of force of a magnetic dipole, S. Chapman and M. Suguira.

J. Geophys. Research 61, 485 (1956). 1634. Atomic radiation and polymers, L. A. Wall. J. Soc. Plastics Engr. 12, No. 3, 17 (1956). 1635. Atomic theory of electromagnetic inter- actions in dense materials, U. Fano. Phys. Rev. 103, No. 5, 1202 (1956). 1635A. Attenuation of 86- and 17 6-Mev synchrotron X-rays in concrete and lead, W. Miller and

R. J. Kennedy. Radiol. Research 4, 360 (1956). 1636. Australite (meteoric) glass, D. Hubbard,

E. M. Krumrine, and R. Stair. Trans. Am.

Geophys. Union 37, No. 6, 767 (1956). 1637. Unassigned.

1638. Automatic computations with power series,

P. Henrici. J. Assoc. Computing Machinery

3, No. 1, 10 (1956). 1639. Basis for standards for radiation protection, Li. S. Taylor. Proc. Meeting Society

for Non- Destructive Testing, J. Wash. Acad.

Sci. 46, No. 3, 69 (1956). 1640. Behaviour of "pure gum" rubber vulcani- zates in tension, G. M. Martin, F. L. Roth, and R. D. Stiehler. Trans. Inst. Rubber Ind. 32, No. 6, 189 (1956).

1641. Best approximation polynomials of given degree, J. L. Walsh. Proc. 6th Symp. Appl. Math. (Am. Math. Soc. , Santa Monica,

Calif. , 1953) p. 213 (1956). 1642. Boron steels, T. G. Digges. Symp.

Production, Properties, and Applications of Alloy and Special Steels, Natl. Metallurgical

Lab. , India (19 56). 1643. Bremsstrahlung polarization measurements for 1. 0-Mev electrons, J. W. Motz.

Phys. Rev. 104, No. 3, 557 (1956).

1644. Calibration of the portable Swedish freeair chamber equipment at the U. S. National Bureau of Standards, H. O. Wyckoff and R. Thoraeus. Acta Radiol. 46, 741 (1956). 1645. Calorimetric comubstion in a bomb of compounds containing carbon, hydrogen, oxygen, and nitrogen, E. J. Prosen. Chapter 6 in the book Experimental Thermochemistry (Inter- science Publ. Inc. , New York, N. Y. ) p. 129

(1956). 1646. Chemiluminescence as a tool in the study

of liquid flow boundaries, A. S. Friedman. J. Appl. Phys. 27, 417 (1956). 1647. Chromium for gun bores, J. P. Young. Am. Rifleman 104, 39 (19 56). 1648. Chromium plating of gun bores, V. A. Lamb and J. P. Young. Ann. Proc. Am.

Electroplaters' Soc, 260 (1956). 1649. Clamp for handling radioactive liquids, A. Schwebel. Nucleonics 14, No. 9, 112 (1956). 1650. Clues to ionospheric conditions in the southern auroral zone, A. H. Shapley. In Antarctica in the International Geophys. Year; based on a Symp. on the Antarctic, Cosponsored

by the U. S. Natl. Comm. for the IGY of the Natl. Acad. Sci. , Natl. Sci. Foundation and Am.

Geophys. Union (Washington, D. C. ) p. 86 (1956).

1651. Color rendition in fluorescent sources of illumination, H. Helson, D. B. Judd, and M.

Wilson. Ilium. Eng. 51, 329 (19 56). 1652. Commutator for periodically changing the direction and magnitude of direct currents, F. Ogburn and H. I. Salmon. Plating 43, 343 (1956). 1653. Commutators of A and A*, T. Kato and O. Taussky. J. Wash. Acad. Sci. 46, 38 (1956). 1654. Commuting bilinear transformations and

matrices, O. Taussky and J. Todd. J. Wash.

Acad. Sci. 46, 373 (1956). 1655. Comparison of the characteristic energy

losses of electrons with the fine structure of the X-ray absorption spectra, L. B. Leder, H. Mendlowitz, and L. Marton. Phys. Rev. 101, No. 5, 1460 (1956). 1656. Compilation of phase diagrams of interest

to ceramists, E. M. Levin, H. F. McMurdie,

and F. P. Hall. Book, Phase of Ceramists (Am. Ceram. Soc. ) (1956). 1657. Compressibility factor, density, specific heat, enthalpy, entropy, free energy function, viscosity, and thermal conductivity of steam,

L. Fano, J. H. Hubbell, and C. W. Beckett.

Natl. Advisory Comm. Aeronaut. Tech. Note

3273 (1956). 1658. Compressibility of binary alkaline- earth borate glasses at high pressures, C. E. Weir

and L. Shartsis. J. Am. Ceram. Soc. 39, No.

9, 319 (1956). 1659. Conference on quantum interactions of the

free electron, L. Marton. Rev. Mod. Phys. 28, No. 3, 172 (1956). 1660. Confidence intervals for a proportion, E.

L. Crow. Biometrika (London, England) 43, Pts. 3 and 5, 423 (1956). 1660 A. Contributions to Dictionary of Physics and Electronics, C. H. Page. (D. Van Nostrand

Co. Inc., New York, N. Y. ) (1956).

1661. Contributions to the theory of rank order

statistics--the two sample case, I. R. Savage. Ann. Math. Stat. 27, 3 (1956).

118
1956

1662. Convenient microwave harmonic generator,

R. B. Riley. Rev. Sci. Instr. 27, 174 (1956). 1663. Correlation in VHF propagation over

irregular terrain, R. S. Kirby and F. M. Capps. IRE Trans, on Ant. Prop. AP-4, No. 1, 77

(1956). 1664. Corrosion, observing 3d year anniversary

of "Corrosion Technology," J. G. Thompson.

Corrosion Tech. 3, No. 4, 105 (1956). 1665. Cracking of reinforced concrete flexural members, A. P. Clark. J. Am. Concrete Inst. 27, 851 (1956). 1666. Cryoscopic determination of purity of highly reactive substances, A. R. Glasgow, Jr. , and M. Tenenbaum. Anal. Chem. 28, 1907 (1956). 1667. Crystal structure of anhydrous indium

phosphate and thallic phosphate by X-ray

diffraction, R. C. L. Mooney. Acta Cryst. 9, No. 95-204, Pt. 2, 113 (1956). 1668. Currents excited on a conducting surface

of large radius of curvature, J. R. Wait. IRE Trans. Microwave Theory and Tech. MTT-4,

143 (1956). 1669. Dental materials and instruments 1951-55,

G. C. Paffenbarger. Intern. Dental J. 6, No.

3, 299 (1956). 1670. Design of experiments in operations research, W. J. Youden. Operations Research

for Management II, 282 (19 56). 1671. Determinanten mit ueberwie gender

Hauptdiagonale und die absolute Konvergenz

von linearen Iterationsprozessen, A. M.

Ostrowski. Comment, Math. Helv. 30, 175

(1956). 1672. Determination of resin content of glass

fiber polyester laminates containing a calcium

carbonate filler, S. D. Toner. Anal. Chem.

28, 1109 (1956). 1673. Determination of the monomer content

of polymethyl methacrylate, H. J. Caul, L. A. Wall, and N. Acquista. J. Am. Dental Assoc.

53, 56 (1956). 1674. Development and evaluation of ceramic

coatings for thermocouples, F. H. Sawada,

C. J. Carter, P. D. Freeze, and G. F. Blackburn. Wright Air Devel. Ctr. Tech. Report

56-135 (1956). 1675. Development of automatic computers, F.

L. Alt. Appeared in "Electronics in Management", Li. H. Hattery and G. P. Bush, editors (The University Press of Washington, D. C. ) p. 15 (1956). 1676. Differential cross- section measurements

of thin-target brems strahlung produced by 2.7-

to 9. 7- Mev electrons, N. Star felt and H. W.

Koch. Phys. Rev. 102, 1598 (1956). 1677. Dilworth's theorem on partially ordered

sets, G. B. Dantzig and A. J. Hoffman. Ann. Math. Studies No. 38, 207 (1956). 1678. Discussion of the paper "Heavy steel- aggregate concrete", by E. I. Fiensenheiser

and B. A. Wasil, discussed by B. E. Foster.

J. Am. Concrete Inst. 28, No. 6, 1143

(1956). 1679. Discussion of the paper "Wave action in diffusers for exhaust-pipe systems, with special reference to the scavenging of two- stroke engines", by F. J. Wallace and G. Boxer,

discussed by D. H. Tsai. Proc. Inst. Mech.

Engrs. 170, 1152 (1956).

1680. Disintegration of selenium-73, R. W. Hayward and D. D. Hoppes. Phys. Rev.

101, No. 1, 93 (1956). 1681. Distribution of electrons scattered by

solids, J. A. Simpson, T. F. McCraw, and L. Marton. Phys. Rev. 104, No. 1, 64 (1956). 1682. Documentation in instrumentation, W. A. Wildhack, J. Stern, and J. Smith. Studies in Coordinate Indexing Vol. Ill, Documentation,

Inc. (1956). 1683. Durability of deaired brick, J. W. McBurney and P. V. Johnson. J. Am. Ceram.

Soc. 39, No. 5, 159 (19 56). 1684. Dynamic and static tests for mechanical

properties of fired plastic refractories and

other more resilient materials, L. E. Mong

and W. L. Pendergast. J. Am. Ceram. Soc.

39, No. 9, 293 (1956). 1685. Dynamics of complete right ventricular

failure in dogs maintained with an extracorporeal left ventricle, J. C. Rose, E. J. Lazaro,

and H. P. Broida. J. Am. Heart Assoc. 4, No. 2, 173 (1956). 1686. Effect of dissolved air on the speed of sound in water, M. Greenspan and C. E. Tschiegg. J. Acoust. Soc. Am. 28, 501

(1956).

1687. Effect of size on the inlet- system dynamics

in four- stroke, single- cylinder engines, D. H.

Tsai. Trans. Am. Soc. Mech. Engrs. 78, No. 1, 197 (1956). 1688. Effect of the ground screen on the field radiated from a monopole, J. R. Wait. IRE

Trans, on Ant. Prop. AP-4, 179 (1956). 1689. Effect of 20-year marine exposure on some aluminum alloys, F. M. Reinhart and

G. A. Ellinger. Am. Soc. Testing Materials

Spec. Tech. Publ. 175, 47 (1956). 1690. Effects of multiaxial stretching on crazing and other properties of transparent plastics,

I. Wolock and D. A. George. SPE J. 12, 20

(1956).

1691. Elastic and plastic behavior of the ferrite

lattice in a low- alloy steel, H. C. Vacher, R. Liss, and R. W. Mebs. Acta Met. 4, No. 5, 532 (1956). 1692. Elastic moduli of glasses at elevated temparatures by a dynamic method, S. Spinner.

J. Am. Ceram. Soc. 39, No. 3, 113 (1956). 1693. Elastic moduli of indium antimonide, R.

F. Potter. Phys. Rev. 103, No. 1, 47 (1956). 1694. Elastic scattering of electrons and posi- trons by point nuclei, J. A. Doggett and L,. V. Spencer. Phys. Rev. 103, No. 6, 1597 (1956). 1695. Electrical conduction in magnesium

stannide at low temperatures, H. P. R. Frederikse, W. R. Hosier, and D. E. Roberts. Phys. Rev. 101, No. 6, 1653 (1956). 1696. Electrodeposition of metals from organic

solutions, Part I. General Survey, A. Brenner.

J. Electrochem. Soc. 103, No. 12, 652 (1956). 1697. Electrodeposition of metals from organic

solutions, Part II. Further studies on the electrodeposition of aluminum from a hydride

bath, J. H. Connor and A. Brenner. J. Electro- chem. Soc. 103, No. 12, 657 (1956). 1698. Electron affinity of atomic sulfur and

empirical affinities of the light elements, L. M. Branscomb and S. J. Smith. J. Chem.

Phys. 25, No. 3, 598 (1956).

119
1956

1699. Electron characteristic energy losses in metals and compounds, L. B. Leder. Phys. Rev. 103, No. 6, 1721 (1956). 1700. Electron injection in betatrons, M. Danos.

Bui. Am. Phys. Soc. Ser. n, No. 1, 344, Abstract (1956).

1701. Electron interference and phase effects. Electron interference phenomena, L. Marton.

Proc. Intern. Conf. Electron Microscopy,

July 19 54 (Royal Microscopical Society, London,

England) p. 272 (1956). 1702. Electron interference experiments, J. A. Simpson, Rev. Mod. Phys. 28, No. 3, 254

(1956). 1703. Electron microscopy, M. Swerdlow, A.

J. Dalton, and L. S. Birks. Anal. Chem. 28, No. 4, Pt. II, 597 (19 56). 1704. Electron optical image of an atomic beam,

L. Marton, D. C. Schubert, and S. R. Mielczarek.

J. Appl. Phys. 27, No. 4, 419 (1956). 1705. Emission spectroscopy, W. F. Meggers.

Anal. Chem. 28, 616 (1956). 1706. Entoptic color-perceptions of the macular

pigment by observers of normal and colordefective vision according to the three- components theory, D. B. Judd. Proc. 1953 Colloquium on Optical Problems in Vision

(Madrid, Spain) (195 6).

. 1707. Error bounds for the eigenvalues of symmetric integral equations, H. Wielandt. Proc. 6th Symp. Appl. Math. (Am. Math. Soc., Santa Monica, California, 1953) p. 261 (1956). 1708. Excitation and separation of pure high- order modes in large high-Q cavities, C. T. Zahn and W. G. Schweitzer, Jr. , J. Appl. Phys. 27, No. 8, 929 (1956). 1709. Experimental proof for the existence

of nonthermal rotational distributions of OH

( 2 2

+

) in flames, H. P. Broida and H. J. Kostkowski. J. Chem. Phys. 25, No. 4, 676

(1956).

1710. Extension of Munsell renotation system to very dark colors, D. B. Judd ana G. Wyszecki.

J. Opt. Soc. Am. 46, 281 (1956).

1711. Farm milk tank testing, M. W. Jensen. Milk Products J. p. 17 (1956).

1712. First report of the special committee on world-wide ionospheric soundings, A. H. Shapley. Intern. Sci. Radio Union (URSI) Inform. Bull. 99, 48 (1956).

1713. Fluorescent sunlamps in laboratory aging

tests for plastics, F. W. Reinhart and M. K. Mutchler. ASTM Bull. No. 212, 45 (1956).

1714. Unassigned.

1715. Future office and factory automation,

Interpreter (Insurance Accounting and

Statistical Association), 15, No. 9, 1 (1956).

1716. Galvanomagnetic effects in n-type InSb at

4. 2°K, H. P. R. Frederikse and W. R. Hosier. Can. J. Phys. 34, 1377 (19 56).

1717. Galvanometer efficiency as a design para- meter, F. K. Harris. Commun. and Electronics, Am. Inst. Elec. Engrs. 24, 176 /1956).

1718. Gamma radiation from Ag105

, R. W. Hay- ward and D. D. Hoppes. Bull. Am. Phys. Soc. Series II, No. 1, 42 (1956).

1719. Generalization of a theorem of Konig, A.

J. Hoffman. J. Wash. Acad. Sci. 46, 211 (1956). 1720. Generalizations of identities for the coefficients of certain modular forms, M. Newman. J. London Math. Soc. 31, 205 (1956).

1721. Generalized tables of corrections to thermodynamic properties for nonpolar gases, W. H. Woolley and W. S. Benedict. Natl. Advisory Comm. Aeronaut. Tech. Note 3272

(1956). 1722. Generation and testing of pseudo- random

numbers, O. Taussky and J. Todd. Proc. Symp.

Monte Carlo Methods (Gainesville, Fla., 1954)

p. 15 (1956). 1723. Geological application of extreme- value methods to interpretation of cobbles and

boulders in gravel deposits, W. C. Krumbein

and J. Lieblein. Trans. Am. Geophys. Union

37, No. 3, 313 (1956). 1724. Gloss meter comparisons, I. Nimeroff,

H. K. Hammond, III, J. C. Richmond, and J. R. Crandall. J. Am. Ceram. Soc. 39, No. 3, 103 (1956). 1725. Government specifications, S. F. Booth.

Plating 43, No. 4, 490 (1956). 1726. Gravitational and thermal oscillations in the earth's upper atmosphere, M. L. White.

J. Geophys. Research 61, 489 (1956). 1727. Heat flow in a fluid with eddying flow, W.

H. Durfee. J. Aeronaut. Sci. 23, 188 (1956). 1728. High frequency induced electroluminescence

in zinc sulfide, G. G. Harman and R. L. Raybold. Phys. Rev. 104, No. 6, 1498 (1956). 1729. High-gain antennas for VHF scatter propagation, H. V. Cottony. Trans. IRE on Commun. Systems CS-4, 56 (1956). 1730. High speed flip-flops for the millimicro- second region, Z. Bay and N. T. Grisamore. IRE Trans, on Elec. Computers EC-5, 3 (1956). 1731. High vacuum gimbals, R. A. Schrack. Rev. Sci. Instr. 27, No. 3, 172 (1956). 1732. Hindered rotation in symmetric- asymmetric

molecules, D. C. Burkhard. Trans. Faraday

Soc. 52, No. 397, Pt. 1, 1 (1956). 1733. How the National Bureau of Standards

contributes to building codes, J. P. Thompson.

Building Officials Conference of America, Inc. , News 4, No. 12, 1 (1956). 1734. In vitro production of experimental enamel caries, A. F. Forziati, F. L. Losee, W. W. Pigman, W. H. Jennings, and M. E. Lawson, Jr. J. Am. Dental Assoc. 53, 655

(19 S6). 1735. Incomplete equilibrium and temperature measurement, C. M. Herzfeld. J. Wash.

Acad. Sci. 46, 269 (1956). 1736. Indirect transitions in indium antimonide,

R. F. Potter. Phys. Rev. 103, 861 (1956). 1737. Influence of copper ions on the adherence

of vitreous coatings to stainless steel, D. G. Moore and A. G. Eubanks. J. Am. Ceram.

Soc. 39, No. 10, 357 (1956). 1738. Influence of exposure conditions on the accelerated durability testing of asphalt, L. R. Kleinschmidt. ASTM Bull. No. 213, p. 69

(1956). 1739. Infrared spectra of hydrogen cyanide and deuterium cyanide, H. C. Allen, Jr. , E. D. Tidwell, and E. K. Plyler. J. Chem. Phys.

25, No. 2, 302 (1956). 1740. Infrared spectrum of hydrogen sulfide, H. C. Allen, Jr. , and E. K. Plyler. J. Chem.

Phys. 25, No. 6, 1132 (1956).

120
19! 1741. Infrared spectrum of hydrogen sulfide from 2200-2800 cm" 1

, H. C. Allen, Jr. , P. C. Cross, E. K. Plyler, and L. R. Blaine, J. Chem. Phys. 24, No. 1, 35 (1956). 1742. Insulating concretes, R. C. Valore, Jr. J. Am. Concrete Inst. 28, 5 (1956). 1743. Integral boundary points of convex poly- hedra, A. J. Hoffman and J. B. Kruskal. Ann. Math. Studies No. 38, 223 (1956). 1744. Interaction of stretching vibrations and

inversion in ammonia, W. S. Benedict and E.

K. Plyler. J. Chem. Phys. 24, No. 4, 904

(1956). 1745. Interfacial waves in viscoelastic media,

C. M. Tchen. J. Appl. Phys. 27, No. 5, 431

(1956). 1746. International comparisons of radioactivity standards, A. V. Astin, E. C. Bullard, and W. B. Lewis. Science 123, 895 (1956). 1747. Interpretation of spectra of atoms and molecules in solid nitrogen condensed at 4.2° K,

C. M. Herzfeld and H. P. Broida. Phys. Rev.

101, 606 (1956). 1748. Introduction, L. Marton. To July 1956

issue Rev. Mod. Phys. containing all papers

of the Intern. Conf. "Quantum Interactions of

the Free Electron" 28, No. 3, 171 (1956). 1749. Ionization and dissociation of NF3 by

electron impact, R. M. Reese and V. H. Dibeler. J. Chem. Phys. 24, 1175 (1956). 1750. Ionospheric effects produced by solar

flare radiation, V. Agy. Phys. Rev. 102, 917

(1956).

1751. Iron catalyst for production of liquid para- hydrogen, D. H. Weitzel and O. E. Park. Rev. Sci. Instr. 27, No. 1, 57 (1956). 1752. Jerkmeter for ballistocardiography, T. A. Perls and C. W. Kissinger. Rev. Sci. Instr. 27, No. 1, 51 (1956). 1753. Kinetics of capillary shear degradation

in concentrated polymer solutions, A. B.

Bestul. J. Chem. Phys. 24, No. 6, 1196 (1956). 1754. Laboratory and field exposure studies of leather fungicides, S. Dahl and A. M. Kaplan.

J. Am. Leather Chemists Assoc. 51, No. 3,

119 (1956). 1755. Legislative control of radiation, L. S. Taylor. Radiology 66, No. 2, 246 (1956). 1756. Les Tektites - Ces objets de verre tombes

du ciel proviennent- ils d'une planete perdue?

R. Stair. Sciences et Evenir (Paris, France)

No. 116, 441 (1956). 1757. Linear programming, A. J. Hoffman.

Appl. Mech. Rev. 9, 185 (1956). 1758. Lines of the chemical elements in astronomical spectra. P. W. Merrill; Appendix A-- Partial Grotrian diagrams of astro- physical interest, C. E. Moore and P. W.

Merrill. Carnegie Inst. Washington, D. C. , Publ. 610, 103 (1956).

1759. Liquid- scintillator temperature effects, H. H. Seliger and C. A. Ziegler. Nucleonics

14, No. 4, 49 (1956). 1760. Longitudinal impact tests of long bars

with a slingshot machine, W. Ramberg and L. K. Irwin. Am. Soc. Testing Materials Spec. Tech. Publ. No. 176, Symp. Impact Testing, June 1955 (19 56). 1761. Low frequency radiation from a horizontal antenna over a spherical earth, J. R. Wait. Can. J. Phys. 34, 586 (1956).

1762. Machine attacks on problems whose vari- ables are permutations, C. B. Tompkins.

Proc. 6th Symp. Appl. Math. (Am. Math. Soc. , Santa Monica, Calif., Aug. 1953) (1956). 1763. Machines for retrieving and correlating recorded information, S. N. Alexander. Proc.

Conf. on Practical Utilization of Practical Knowledge (Western Reserve Univ. Press,

Cleveland, Ohio, 1956). 1764. Mass spectrometry, V. H. Dibeler.

Anal. Chem. 28, 610 (1956). 1765. Unassigned.

1766. Unassigned.

1767. Meaning and standardization of pH

measurements, R. G. Bates. ASTM Symp.

on pH Measurements, Am. Soc. Testing Materials Spec. Tech. Pub. No. 190 (1956). 1768. Measurement of the resistance- strain relation and Poisson's ratio for copper wires,

T. E. Wells. Paper No. 56-8-3, Proc.

Instr. Soc. Am. 11, No. 9, 377 (1956). 1769. Measurement of Wair for sulfur- 35 beta- rays, Z. Bay, W. B. Mann, H. H. Seliger, and H. O. Wyckoff. Radiol. Research

Abstract 5, No. 4, 9 (1956). 1770. Measurements of the phase of signals received over transmission paths with electrical lengths as a result of atmospheric turbulence,

J. W. Herbstreit and M. C. Thompson, Jr. IRE Trans, on Ant. Prop. AP-4, 352 (1956).

1771. Measurements on sound absorbers for jet-engine test cells, R. V. Waterhouse, R.

K. Cook, and R. D. Berendt. J. Acoust. Soc. Am. 28, No. 4, 688 (1956). 1772. Mechanical tests on specimens from

large aluminum- alloy forgings, J. A. Miller and A. L. Albert. Natl. Advisory Comm.

Aeronaut. Tech. Note 3729 (1956). 1773. Mechanism of autoignition in benzene- air mixtures, A. Beckers and W. J. Levedahl.

Ind. Eng. Chem. 48, 411 (1956). 1774. Melting of copolymers, P. J. Flory and

L. Mandelkern. J. Polymer Sci. 21, No. 98, 345 (1956). 1775. Melting-point and phase- equilibrium

determinations, S. M. Lang. High Temp.

Technol. p. 409 (J. Wiley & Sons, New York,

N. Y. , and Chapman and Hall, London,

England. ) (1956). 1776. Methods for measuring the "Q" of large reactors, C. Peterson, B. L. Dunfee, and F.

L. Hermach. Am. Inst. Elec. Engrs. Trans. Paper No. 56-87 (1956). 1777. Metrology and production, A. V. Astin. Ordnance 40, No. 216, 973 (1956). 1778. Microwave absorption in compressed

gases; saturated hydrocarbons, A. A. Maryott

and G. Birnbaum. J. Chem. Phys. 24, 1022

(1956). 1779. Millimicrosecond coincidence circuits,

Z. Bay. Nucleonics 14, No. 4, 56 (19 56). 1780. Unassigned.

1781. Multiple reflections between the earth and the ionosphere in VLF propagation, J. R. Wait and A. Murphy. Geofisica Pura e Applicata 35, 61 (1956). 1782. Near infrared spectrum of nitrous oxide, E. K. Plyler, E. D. Tidwell, and H. C. Allen, Jr. J. Chem. Phys. 24, No. 1, 95 (1956).
1956

1783. New materials for magnetic cooling and thermometry below 1°K, E. Ambler and R. P. Hudson. Phys. Rev. 102, 916 (1956). 1784. New paper products in competition with

textiles, R. B. Hobbs. Am. Dyestuff Reptr.

45, 479 (1956). 1785. Unassigned.

1786. Notes on post- treatment for HAE coatings, H. I. Salmon and F. Ogburn. Plating 43, 1251

(1956). 1787. Nuclear elastic scattering of photons, E.

G. Fuller and E. V. Hayward. Phys. Rev. 101, No. 2, 692 (1956). 1788. Numerical analysis, Review of, J. Todd. Proc. Symp. Applied Mathematics Vol. VI, Science 124, No. 3233, 1211 (1956). 1789. Numerical experiments in potential theory using orthonormal functions, P. Davis

and P. Rabinowitz. J. Wash. Acad. Sci. 46,

12 (1956). 1790. Oblique- incidence measurements of the heights at which ionospheric scattering of the VHF radio waves occurs, V. Pineo. J. Geophys. Research 61, 165 (1956).

1791. On a generalization of the normal basis

in abelian algebraic number fields, M. Newman

and O. Taussky. Commun. on Pure and Appl. Math. (New York University, New York, N. Y. ) 9, 85 (1956). 1792. On asymptotic series for functions occurring in the theory of diffraction of waves by

wedges, F. Oberhettinger . J. Math, and

Phys. 34, No. 4, 245 (1956). 1793. On systems of distinct representatives,

A. J. Hoffman and H. W. Kuhn. Ann. Math.

Studies No. 38, 199 (1956). 1794. On systems of linear inequalities, K. Fan.

Ann. Math. Studies 38, 99 (19 56). 1795. On the asymptotic transformation of certain distributions into the normal distribution, W. Wasow. Proc. 6th Symp. Appl. Math. (Am. Math. Soc. Santa Monica, Calif., 1953)

p. 251 (19 56). 1796. On the conductance of slots, J. R. Wait. IRE Trans, on Ant. Prop. AP-4, 124 (1956). 1797. On the existence of identities for the coefficients of certain modular forms, M. Newman. J. London Math. Soc. 31, 350 (1956). 1798. On the Lerch zeta functions, F. Oberhettinger. Pacific J. Research 6, No. 1, 117 (1956). 1799. On the propagation of electromagnetic and acoustic pulses. Part I: Diffraction of pulses by wedges, F. Oberhettinger. Z. Phys.

146, 423 (1956). 1800. On the waveform of a radio atmosphere

at short ranges, J. R. Wait. Proc. IRE 44, 1052 (1956).

1801. Outline of characteristics of an imageforming system, R. V. Shack. J. Opt. Soc. Am. 9, 755 (1956). 1802. Oxidative degradation of styrene and

deuterostyrene polymers, L. A. Wall, M. R. Harvey, and M. Tryon. J. Phys. Chem. 60, 1306 (1956). 1803. Parameters of the 15-Mev X-rays

scattered by C12

, E. V. Hayward and E. G.

Fuller. Physica 22, 1138 (1956). 1804. Unassigned.

1805. Phase generator for tropospheric research,

R. W. Hubbard and M. C. Thompson, Jr. Electronics 29, No. 10, 220 (1956).

1806. Photoconductivity and photovoltaic effect

in intermetallic compounds, H. P. R. Frederikse

and R. F. Blunt. Photoconductivity Conf.

Atlantic City, N. J. (John Wiley & Sons, Inc. , New York, N. Y. ) p. 414 (19 56). 1807. Photoemission from silver into sodium

chloride, thallium chloride, and thallium bromide, W. J. Turner. Phys. Rev. 101, No. 6, 1653

(1956). 1808. Physical standards for the electronics

industry, A. V. Astin. Signal 10, No. 5, 45

(1956). 1809. Pitfalls in computation, I. A. Stegun and M. Abramowitz. J. Soc. Indust. Appl. Math.

4, 207 (1956).

1810. Plastic springs, F. W. Reinhart and S. B. Newman. Product Eng. 27, 183 (1956).

1811. Plastics, G. M. Kline. Grolier Encyclopedia (1956 ed); J. Eng. Mech. Div. Proc. Am.

Soc. Civil Engrs. 84, Paper 1071, EM 4 (1956).

1812. Point-to-point radio relaying via the scatter mode of tropospheric propagation, K. A. Norton. IRE Trans, on Commun. Systems CS-4,

No. 1, 39 (1956).

1813. Polymer structure research at the National Bureau of Standards, N. Bekkedahl. Revue

General de Caoutchouc (Paris, France) 33,

1129 (1956).

1814. Power supplies for 60- cycle tests of electrical instruments and meters, F. L. Hermach.

Instr. Soc. Am. Proc. 11, Paper No. 56-21-3

(1956).

1815. Precise coulometric titrations, J. K. Taylor and S. W. Smith. Science 124, No. 3228, 940 (1956).

1816. Preparation of pure hydroxyapatite

crystals, A. Perloff and A. S. Posner.

Science 124, No. 3222, 583 (1956).

1817. Prevention of microbiological deterioration

of leather, S. Dahl. J. Am. Leather Chemists

Assoc. 51, No. 3, 104 (1956). 1818. Problems of logical design, A. L. Leiner. Proc. Convention on Digital Techniques, Inst. Elec. Engrs. (London, England. ) (1956).

1819. Processing denture base resins: heat- curing type, J. W. Stanford and G. C. Paffen- barger. J. Am. Dental Assoc. 53, 72 (1956). 1820. Programming of scientific computers, J. H. Wegstein and S. N. Alexander. Control Eng. 3, No. 5, 87 (19 56). 1821. Unassigned.

1822. Progress report on automatic data processing in Government, 1956, S. N. Alexander.

University of Michigan (Ann Arbor, Michigan)

(1956). 1823. Propagation of sound in five monoatomic

gases, M. Greenspan. J. Acoust. Soc. Am. 28, No. 4, 644 (1956). 1824. Properties of concrete at high rates of loading, D. Watstein. Am. Soc. Testing Materials

Spec. Tech. Publ. 176, Symp. Impact Testing, June 1955 (1956). 1825. Properties of fluorine compounds, the vibrational spectrum of tetrabromoethylene, D. E. Mann, J. H. Meal, and E. K. Plyler. J. Chem.

Phys. 24, No. 5, 1018 (1956). 1826. Discussion of paper, Properties of portland cement pastes cured at elevated temperatures and

pressures, C. M. Hunt. J. Am. Concrete Inst. 28, Pt. 2, No. 6, 1934 (1956).

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Trans, on Elec. Computers EC- 5, No. 4, 213

(19 56). 1828. Punched- cell batteries with polyethylene

glycol electrolytes, R. E. Wood. J. Electro- chem. Soc. 103, 417 (1956). 1829. Quantum interactions of the free electron, H. Mendlowitz. Phys. Today 9, No. 8, 27

(1956). 1830. Radiation patterns of circumferential

slots on moderately large conducting cylinders,

J. R. Wait and J. Kates. Inst. Elec. Engrs. Mono. No. 167 R, 1 (1956).

1831. Radiation protection for the general

practitioner, L. S. Taylor. Southern Med. J. of the Southern Medical Assoc. 49, 8 (1956). 1832. Radiation regulations, L. S. Taylor.

Hospitals 30, No. 13, 23 (1956). 1833. Radiation resistance of dipoles in an

interface between two dielectrics, J. R. Wait. Can. J. Phys. 34, 24 (1956). 1834. Radiative electron capture in cesium131, D. D. Hoppes and R. W. Hayward. Phys. Rev. 104, No. 2, 368 (1956). 1835. Radiative orbital electron capture in vanadium-49, R. W. Hayward and D. D. Hoppes. Phys. Rev. 104, No. 1, 183 (1956). 183 6. Radio observations of interstellar neutral hydrogen clouds, R. S. Lawrence.

Astrophys. J. 123, No. 1, 30 (1956). 1837. Reaction of nitrous acid with collagen,

J. M. Cassel. J. Am. Leather Chemists

Assoc. 51, 406 (19 56). 1838. Reciprocity law for X-rays, Parti:

Validity for high- intensity exposures in the negative region, M. Ehrlich and W. L. McLaughlin. J. Opt. Soc. Am. 46, No. 10, 797 (1956). 1839. Reciprocity law for X-rays, Part 2: Failure in the reversal region, M. Ehrlich.

J. Opt. Soc. Am. 46, No. 10, 801 (1956). 1840. Record papers and their preservation, W. K. Wilson. Capital Chemist 6, 46 (1956).

1841. Reduction of adjacent- channel inter- ference from on-off keyed carriers, A. D.

Watt, R. M. Coon, and V. J. Zurich. IRE

Trans, on Commun. Systems CS-4, 41 (1956). 1842. Refraction and dispersion of thallium bromide iodide, W. S. Rodney and I. H. Malitson. J. Opt. Soc. Am. 46, No. 11, 956

(1956). 1843. Reinforced plastic springs, F. W.

Reinhart and S. B. Newman. SPE J. 12, 8

(1956). 1844. Relation between refractive index and

elastic moduli of a borosilicate glass after heat treatment, S. Spinner. J. Am. Ceram.

Soc. 39, No. 11, 390 (1956). 1845. Relationships between aurora and sporadic-E echoes at Barrow, Alaska, R. W. Knecht. J. Geophys. Research 61, 59

(1956). 1846. Relationship between residual monomer

and some properties of self- curing dental resins, H. J. Caul, W. T. Sweeney, and G.

C. Paffenbarger. J. Am. Dental Assoc. 53, 60 (1956).

1847. Relaxation of vibrational nonequilibrium

distributions: I. Collisional relaxation of a system of harmonic oscillators, R. J. Rubin

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on Ant. Prop. AP-4, 168 (1956).

1849. Report on Joint Commission for Spectros- copy Meeting, C. E. Moore. J. Opt. Soc. Am.

46, 1004 (1956). 1850. Report on reducing sugars. Effect of clarification with neutral lead acetate before determining reducing sugars in molasses, E.

J. McDonald. J. Assoc. Offic. Agr. Chemists

39, 676 (1956).

1851. Report on revision of atmospheric radio

noise data, W. Q. Crichlow and R. T. Disney. CCIR Report No. 65, VIII Plenary Assembly, Warsaw (1956) (International Radio Consultative Committee, Secretariat, Geneva, Switzerland)

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F. Snyder. J. Assoc. Offic. Agr. Chemists

39, 676 (1956). 1853. Research on effects of prestraining and

notch sharpness on the notch strength of materials, G. W. Geil and N. L. Carwile. Wright Air Devel. Ctr. Tech. Rept. 56-402

(1956). 1854. Resin cements and posteriortype directfilling resins, P. J. Schoubee, G. C. Paffen- barger, and W. T. Sweeney. J. Am. Dental Assoc. 52, 584 (1956). 1855. Resistencia a la tension de los plasticos, F. W. Reinhart. Revista de Plasticos 7, No.

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delle materie plastische, G. M. Kline. Poliplasti (E.T.A. S. Editrice, Milano, Italy) 2, 2529, 62 (1956). 1858. Role of oxygen in the quenching of liquid scintillators, H. H. Seliger, C. A. Ziegler, and I. Jaffe. Phys. Rev. 101, No. 3, 998 (1956). 1859. Rotation- vibration spectra of deuterated water vapor, E. K. Plyler, W. S. Benedict, andN. Gailar. J. Chem. Phys. 24, 1139 (1956). 1860. Unas signed.

1861. Safety color codes, H. J. Keegan. Mag.

of Standards 27, 21 (1956); J. Opt. Soc. Am.

46, 74 (1956). 1862. Screw thread standardization, A. T. McPherson. Standards Engrs. Soc. Proc. for 1956 (Proc. of the 5th Annual Natl. Meeting

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E. Mann. J. Chem. Phys. 25, 595 (1956). 1864. Sensitivity and life data on Bourdon

tubes, H. L. Mason. Trans. Am. Soc. Mech.

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lactones, H. L. Frush and H. S. Isbell. J. Am. Chem. Soc. 78, No. 12, 2844 (1956). 1869. Solvability and consistency for linear equations and inequalities, H. W. Kuhn. Am.

Math. Mo. 63, 217 (1956). 1870. Some activities of the NBS in the field of

fire research, A. F. Robertson. Natl. Acad.

Sci. and Natl. Research Council Publ. No. 475,

(1956). 1871. Some algebraic number theory estimates based on the Dedekihd eta- function, H. Cohn. Am. J. Math. 78, 791 (1956). 1872. Some aspects of tropospheric radio wave

propagation, A. P. Barsis. IRE Trans, on Broadcast Transmission Systems- 6, 1 (1956). 1873. Some computational problems in algebraic number theory, O. Taussky. Proc. 6th Symp.

App. Math, of Am. Math. Soc. (Santa Monica,

Calif. , 1953) p. 187 (1956). 1874. Some meteorological effects on scattered

radio waves, B. R. Bean. IRE Trans, on Commun. CS-4, No. 1, 32 (1956). 1875. Some Monte Carlo experiments in computing multiple integrals, P. Davis and P. Rabinowitz. Math. Tables and Other Aids to Computation 10, 1 (1956). 1876. Some physical properties of gallium cop- per-tin alloys, D. L. Smith, H. J. Caul, and W. T. Sweeney. J. Am. Dental Assoc. 53, 677

(1956). 1877. Some physical properties of high- density thorium oxide, S. M. Lang and F. P. Knudsen.

J. Am. Ceram. Soc. 39, No. 12, 415 (1956). 1878. Sources of error in various methods of airplane camera calibration, F. E. Washer. Photogrammetric Eng. 22, No. 4, 727 (1956). 1879. Sources of transport coefficients and correlations of thermodynamic and transport data,

J. Hilsenrath. Agard Selected Combustion Problems, II Fundamentals and Aeronautical Applications. (Buttersworth Sci. Pub. , London,

England) p. 199 (1956). 1880. Specifications, standards and codes, governmental aspects, R. S. Dill. Symp. Am.

Soc. Heating and Air Conditioning Engrs. Problems of Standards and Codes, p. 16 (1956). 1881. Spectra emitted from solid nitrogen con- densed at 4.2°K from a gas discharge, A. M.

Bass and H. P. Broida. Phys. Rev. 101, No. 6, 1740 (1956). 1882. Spectral absorption method for determining

population "temperatures" in hot gases, H. J. Kostkowski and H. P. Broida. J. Opt. Soc. Am.

46, No. 4, 246 (1956). 1883. Spectroscopic observations on pentaborane-air flames and explosions, W. G. Berl,

E. L. Gayhart, H. L. Olsen, H. P. Broida, and

K. E. Shuler. J. Chem. Phys. 25, No. 4, 797

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1884. Spectrum of frequency- shift radio photo- transmissions, A. D. Watt. IRE Trans, on Commun. Systems CS-4, 27 (1956). 1885. Spectrum of the C, molecule between

3600 A and 4200 A, N. H. Kiess and H. P. Broida. Can. J. Phys. 34, 1471 (1956). 1886. Specular- gloss measurement of ceramic

materials, I. Nimeroff, H. K. Hammond, III. , J. C. Richmond, and J. R. Crandall. J. Am.

Ceram. Soc. 39, No. 3, 103 (1956). 1887. Spin- spin absorption in chromic methyl- ammonium alum and manganous chloride tetra- hydrate at very low temperatures, E. Ambler

and R. P. Hudson. Physica XXII, 866 (1956). 1888. Spin- spin absorption in manganous chlo- ride tetrahydrate, E. Ambler and R. P. Hudson.

Phys. Rev. 104, 1506 (1956). 1889. Spin- spin relaxation at very low temperatures in chromic methylammonium alum, E. Ambler and R. P. Hudson. Phys. Rev. 104, 1500 (1956). 1890. Stability of oscillations of superposed

fluids, C. M. Tchen. J. Appl. Phys. 27, No.

7, 760 (1956). 1891. Stabilization film processing for X- and y-ray dosimetry, S. Levinos and M. Ehrlich. Nucleonics 14, No. 7, 72 (1956). 1892. Stable carbon isotope analysis of optical spectroscopy, R. E. Ferguson and H. P. Broida. Anal. Chem. 28, 1436 (1956). 1893. Stable systems of differential equations

with integrable forcing term, H. A. Antosiewicz.

J. London Math. Soc. 31, 208 (1956). 1894. Unassigned.

189 5. Standard electrode potential of the silver, silver chloride electrode, R. G. Bates, E. A. Guggenheim, H. S. Harned, D. J. Ives, G. J. Janz, C. B. Monk, R. A. Robinson, R. H.

Stokes, and W. F. J. Wynne- Jones. J. Chem.

Phys. 25, 361 (1956). 189 6. Statistical methods in chemistry, J. Mandel and F. J. Linnig. Anal. Chem. 28, 770

(1956). 1897. Steric effects in Azo- and indigo dyes, W. R. Brode. Recent Advances in Chem.

Colouring Matters (London, England) SP-4, 1 (1956). 1898. Stress-corrosion cracking of type 304

austenitic stainless steel, H. L. Logan and

R. J. Sherman, Jr. Welding J. Research

Suppl. 35, No. 8, 389 (1956). 1899. Stress- strain relationships in yarns subjected to rapid impact loading, H. F. Schiefer,

J. C. Smith, F. L. McCrackin, and W. K.

Stone. Am. Soc. Testing Materials Spec. Tech.

Publ. 185, Symp. on Speed of Testing on NonMetallic Materials, p. 47 (1956). 1900. Stress- strain relationship in yarns tested

at rates of straining up to a million percent per

minute, H. F. Schiefer, J. C. Smith, F. L. McCrackin, W. K. Stone, and K. M. Towne.

Physics of Wool and Other Viscoelastic Fibers,

D, 148 (1956) (Proc. International Wool Textiles Research Conference, August 20-25, 1955, (Sydney, Australia) (19 56). 1901. Structural rearrangements in silicate glasses during annealing, L. W. Tilton. J. Soc. Glass Technol. (British) 40, T338 (1956).

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19! 1902. Structure of a magnetohydrodynamic

shock wave in a plasma of infinite conductivity,

H. K. Sen. Phys. Rev. 102, 5 (1956). 1903. Student research on ASTM problems,

A. T. McPherson. ASTM Bull. 217, 31 (1956). 1904. Studies of dose distributions in water for betatron X-rays to 37 Mev, B. Zendle, H. W.

Koch, J. McElhinney, and J. W. Boag. Radiol. Research 5, No. 22, 107 (1956). 1905. Studies on leather by means of a sonic technique, J. R. Kanagy and M. Robinson. J. Am. Leather Chemists Assoc. 51, 174 (19 56). 1906. Sulfinic acid derivatives as accelerators

in the polymerization of methyl methacrylate

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G. M. Brauer and F. R. Burns. J. Polymer

Sci. 19, No. 92, 311 (1956). 1907. Surface currents excited by an infinite slot on half- plane s and ribbons, J. R. Wait and M. O'Grady. IRE Trans, on Ant. Prop. AP-4,

No. 1, 47 (1956). 1908. Survey of geomagnetic eclipse phenomena,

S. Chapman. Special Suppl. J. Atmospheric and

Terrest. Phys. 6, 221 (1956). 1909. Synthesis of maltose- 1-

C

14

, maltobionodeltalactone-1-

14 and lithium maltobionate-1- C

14 from 3-( -D- glucopyranosyl)- D- arabinose,

H. S. Isbell and R. Schaffer. J. Am. Chem.

Soc. 78, No. 9, 1887 (1956).

1910. Systems of distinct representatives and

linear programming, A. J. Hoffman and H. W.

Kuhn. Am. Math. Mo. 63, 455 (1956).

1911. Techniques and theory of fast coincidence experiments, Z. Bay. IRE Trans, on Nuclear

Science NS-3, No. 4, 12 (1956).

1912. Tektites and the lost planet, R. Stair.

Sci. Monthly 83, 1 (19 56). 1912A. Tektites, meteoric glass, R. Stair. Discovery (Norwich, England) 17, No. 10, 408

(1956).

1913. Temper brittleness of boron- treated

steel, S. J. Rosenberg. Wright Air Devel.

Ctr. Tech. Rept. 56-396 (1956).

1914. Temperature coefficient of the speed of sound in water near the turning point, M.

Greenspan, C. E. Tschiegg, and F. Breckenridge. J. Acoust. Soc. Am. 28, 500 (19 56). 1915. Temperature effects in gas- free liquid

scintillators, H. H. Seliger and C. A. Ziegler. IRE Trans, on Nuclear Science NS-3, 4 (1956).

1916. Temperature inversions of anhydrous

gallium orthophosphate, A. Perloff. J. Am.

Ceram. Soc. 39, No. 3, 83 (1956).

1917. Temperature studies of air in a truck

tire, G. G. Richey, R. H. Hobbs, and R. D.

Stiehler. Rubber Age 79, 273 (1956).

' 1918. Unassigned.

1919. The absolute photometry of the Gegenschein.

F. E. Roach and M. H. Rees. Symp. on the Air glow and the Aurora, September 1955, Belfast (Pergamon Press, London, England)

p. 142 (1956). 1920. The adhesion of electroplated coatings to titanium, C. Stanley and A. Brenner. Ann.

Proc. Am. Electroplaters ' Soc. p. 123 (19 56). 1921. The assignment problem, T. S. Motzkin. Proc. 6th Symp. Appl. Math, of Am. Math.

Soc. (Santa Monica, Calif. 1953) p. 109 (1956). 1922. The Boltzman equation from the statistical mechanical point of view. M. S. Green. J. Chem. Phys. 25, 836 (1956).

1923. The crystal structure of aluminum phosphate and gallium phosphate, low cristobalite type, R. C. L. Mooney. Acta Cryst. 9, 728

(1956). 1924. The crystallization of flexible polymer

molecules, L. Mandelkern. Chem. Rev. 56, No. 5, 903 (1956). 1925. The distinction between initiation and

propagation of a fatigue crack, J. A. Bennett.

Intern. Conf. on Fatigue of Metals, Inst. Mech.

Engrs. (London, England) (1956). 1926. The effect of particle size on the bulk density and strength properties of uranium dioxide specimens, M. D. Burdick and H. S. Parker.

J. Am. Ceram. Soc. 39, No. 5, 181 (1956). 1927. The effects of weathering on certain mortars exposed in brick masonry with and without caps and flashings, J. W. McBurney. Am. Soc. Testing Materials Proc. 56, 1273 (1956). 1928. The electrical resistance to the earth of a live tree, F. M. Defandorf. Am. Inst. Elec. Engrs. Trans. Paper No. 56, 627, p. 1 (1956). 1929. The engineer at the National Bureau of Standards, A. V. Astin. Am. Eng. 26, No. 9,

18 (1956). 1930. The flame photometric determination of manganese in cement, J. J. Diamond. Anal. Chem. 28, 328 (1956).

1931. The formal power series for log exey, K. Goldberg. Duke Math. J. 23, 13 (1956). 1932. The infrared spectrum and rotational constants of carbon disulfide, H. C. Allen, Jr. , E. K. Plyler, and L. R. Blaine. J. Am. Chem.

Soc. 78, 4843 (1956). 1933. The infrared spectrum and structure, of perchlorlyfluoride, D. R. Lide, Jr., and D. E. Mann. J. Chem. Phys. 25, 1128 (19 56). 1934. The infrared spectrum of acetylene- d^, H. C. Allen, Jr. , E. D. Tidwell, and E. K.

Plyler. J. Am. Chem. Soc. 78, 3034 (19 56). 1935. The integration of concepts in the terminology of measurement and control, H. L. Mason. Trans. Am. Soc. Mech. Engrs. 30, No. 1, 1 (1956). 1936. The ionosphere IGY program in the Arctic,

A. H. Shapley. Proc. Arctic Conf. (Stockholm, Sweden, May 22-25, 1956) Int. Sci. Radio Union

Info. Bui. 98, 29 (1956). 1937. The logical design of a one-microsecond

parallel adder using one-megacycle circuitry, A. Weinberger and J. L. Smith. Am. Inst. Elec. Engrs. Proc. Western Joint Computer Conf. T-85 (1956). 1938. The melting behavior of polybutadienes , L. Mandelkern, M. Tryon, and F. A. Quinn, Jr.

J. Polymer Sci. 19, 77 (1956). 1939. The National Bureau of Standards and its services to industry, R. D. Stiehler. Industries

et Sciences. (L' Association des Ingenieurs Techniciens de Charleroi. Rhode-Staint- Geneselex-Bruxelles, Belgium), 30, No. 4, 17 (1956). 1940. The nature, cause and effect of porosity

in electrodeposits, II. Radiographic detection

of porosity in electrodeposits, F. Ogburn and M.

Hilkert. Ann. Proc. Am. Electroplaters' Soc.

43, 256 (1956).

1941. The nickel dip: a radioisotope study of metallic deposits in porcelain enameling, J. C. Richmond and H. B. Kirkpatrick. Natl. Advis- ory Comm. Aeronaut. Tech. Note 3577 (1956).

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1942. The normalizer of certain modular sub- groups, M. Newman. Can. J. Math. 8, No. 1, 29 (1956). 1943. The number of absolute points of a correlation, A. J. Hoffman, M. Newman, E. G. Straus, and O. Taussky. Pacific J. Math. 6, 83 (1956). 1944. The preparation and maintenance of stan- dards of radioactivity, W. B. Mann. J. Appl. Radiation and Isotopes 1, 3 (1956). 1945. The propagation characteristics of the frequency band 152-162 Mc which is available

for marine radio communications, H. T. Dougherty. Appendix F to report of Spec. Committee 19 of Radio Tech. Commission for Marine Services "Study of a reliable short range radio telephone system" (Washington,

D. C. ) (1956). 1946. The radiation pattern of an antenna mounted

on a surface of large radius of curvature, J. R.

Wait. Proc. IRE 44, 694 (1956). 1947. The radiation patterns and conductances

of slots cut on rectangular metal plates, J. R. Wait and D. G. Frood. Proc. IRE 44, 1469

(1956). 1948. The reactions of ammonia and hydrazine

with oxygen atoms and hydrogen atoms in atomic flames, G. E. Moore, K. E. Shuler,

S. Silverman, and R. C. Herman. J. Phys. Chem. 60, 813 (1956). 1949. The rotation- vibration spectra of deuterated water vapor, W. S. Benedict, N. Gailar, and

E. K. Plyler. J. Chem. Phys. 24, No. 6, 1139

(19 56). 1950. The structure of anhydrous scandium

phosphate, R. C. L. Mooney. Acta Cryst. 9, 677 (1956).

1951. The synthesis and infrared absorption spectra of some m-polyphenyls, R. L. Alexander,

Jr. J. Organic Chem. 21, 1464 (19 56). 1952. The thermal conductivity of argon for temperatures between 0° and 75° C and at pressures up to 2500 atmospheres, A. Michels,

A. Botzen, A. S. Friedman, and V. J. Sengers. Physica 22, 121 (1956). 1953. The uncertainty of measurements, J. Mandel. Chem. Corps Engineering Command,

Proc. 2d Annual Statistical Engineering Symp.

(Edgewood, Maryland) p. 57 (1956). 1954. Thcuse of an AC bridge to measure core

loss at high induction, I. L. Cooter and W. P. Harris. Commun. and Electronics. Am. Inst. Elec. Engrs. No. 24, 252 (1956). 1955. The use of scintillation spectrometers in the study of continuous gamma- and X-ray

spectra between 0. 01 and 20 Mev, N. Starfelt. Kungl. Fysiografiska Sallskapets L Lund

Forhandlinger Bd 26, Nr 5 (University of Lund,

Lund, Sweden) (19 56). 1956. The Washington area scientists- for- teachers program, J. K. Taylor. J. Chem.

Educ. 33, 461 (1956). 1957. Theoretical electromotive forces for cells containing a single solid or molten chloride

electrolyte, W. J. Hamer, M. S. Malmberg,

and B. Rubin. J. Electrochem. Soc. 103, 8

(1956). 1958. Thermal and photochemical processes in polystyrene in the glassy state, L. A. Wall and M. Tryon. Nature 178, 101 (1956).

1959. Unas signed. 1690. Thermal decomposition of manganous and

ferrous carbonates, H. E. Kissinger, H. F. McMurdie, and B. Simpson. J. Am. Ceram.

Soc. 39, No. 5, 168 (1956). 1961. Thermal degradation of unvulcanized and

vulcanized rubber in a vacuum, S. Straus and

S. L. Madorsky. Ind. Eng. Chem. 48, 1212

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(1956). 1963. Thermochemistry and thermodynamics of substances, C. W. Beckett, M. S. Green and H. W. Woolley. Ann. Rev. Phys. Chem. 7, 287

(1956). 1964. Thermodynamic properties of gaseous

nitrogen, H. W. Woolley. Natl. Advisory Comm. Aeronaut. Tech. Note 3271 (1956). 1965. Thermodynamics of crystallization in high polymer s : guttapercha, L. Mandelkern, F.

A. Quinn, Jr. , and D. E. Roberts. J. Am.

Chem. Soc. 78, 926 (1956). 1966. Three ways to increase efficiency of

liquid scintillators, C. A. Ziegler, H. H.

Seliger, and I. Jaffe. Nucleonics 14, No. 5, 84 (1956). 1967. Transient fields of a vertical dipole over

a homogeneous curved ground, J. R. Wait. Can.

J. Phys. 34, 27 (1956). 1968. Transients in signal analysis, E. L. R.

Corliss. J. Wash. Acad. Sci. 46, 305 (1956). 1969. Unimodular matrices of order two which commute, K. Goldberg. J. Wash. Acad. Sci. 46, 337 (1956). 1970. Use of the sensitivity criterion for the comparison of the Bekk and Sheffield smoothness

testers, T. W. Lashoff, J. Mandel, and V. Worthington. Tappi 39, No. 7, 532 (1956). 1971. VHF propagation by ionospheric scattering- survey of experimental results, R. C. Kirby. IRE Trans, on Commun. Systems CS-4, No. 1, 17 (1956). 1972. "VHF propagation measurements in the Rocky Mountain region, R. S. Kirby, H. T. Dougherty, P. L. McQuate. IRE Trans, on

Vehicular Commun. VC-6, 13 (1956). 1973. Vibrational spectrum of tetrabromoethylene, D. E. Mann, J. H. Meal, and E. K.

Plyler. J. Chem. Phys. 24, 1018 (1956). 1974. Vistas in astronomy, C. E. Moore.

Chapter 13, Vol. 2, Atomic Spectra - Their

role in astrophysics, p. 1209 (Pergamon Press, New York, N. Y. ) (1956). 1975. Volume temperature relations of amorphous polymers over an extended temperature

range, G. M. Martin, S. S. Rogers, and L. Mandelkern. J. Polymer Sci. 20, 579 (1956). 1976. Weights and measures administration in the U. S..W. S. Bussey and M. W. Jensen. Supplement to "The Monthly Review" of the

Inst, of Weights and Measures Admin. (April

1956). 1977. Why screw threads must be everybody's

business, I. H. Fullmer. Proc. 7th Natl. Conf. on Standards, p. 45, Am. Stds. Assoc. (1956). 1978. Zirconia reactions in binary oxide sys- tems, R. S. Roth. J. Am. Ceram. Soc. 39, No. 5, 196 (1956).

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Trans. Am. Soc. Mech. Eng. 79, 61 (1957). 1982. A field emitter point projection X-ray

microscope, L. Marton, R. A. Schrack, and

R. C. Placious. X-ray Microscopy and Microradiography (Academic Press Inc. , New York,

N. Y. ) p. 287 (1957). 1983. A function to aid in the fitting of kinetic data to a rate equation, J. H. Flynn. J. Phys. Chem. 61, 110 (1957).

1984. A large liquid hydrogen bubble chamber,

D. B. Chelton, D. B. Mann, and R. A. Byrns.

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of Colorado (Boulder, Colorado) (1957). 1985. A matrix minimization problem, A. J. Goldman. J. Wash. Acad. Sci. 47, No. 12, 405 (1957). 1986. A mechanical refrigeration process for

the no- loss storage of liquid hydrogen, B. W.

Birmingham. Refrig. Eng. 65, No. 42-44, 86

(1957). 1987. A method for measuring the mucosal surface contours of impressions, casts, and dentures, N. W. Rupp, G. Dickson, M. E. Lawson,

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light and color, D. B. Judd. Anale.s real soc. espan. fis. y quim, 53A, No. 1-2, 43 (1957). 1990. A note on symmetric functions of eigenvalues, M. Marcus and R. Thompson. Duke

Math. J. 24, 43 (1957). 1991. A note on the climatic variation of absolute humidity, B. R. Bean and B. A. Cahoon. Bull. Am. Meteorol. Soc. 38, No. 7, 395 (1957). 1992. A note on the propagation of the transient ground wave, J. R. Wait. Symp. on the Prop,

of V. L. F. Radio Waves, Sponsored by the NBS

Boulder Laboratories and IRE Prof. Group on

Ant. and Prop. , January 23- 25, 1957 (Boulder,

Colorado), Appendix D, V. 4, 67; Can. J. Phys.

35, 1146 (1957). 1993. A panoramic X-ray dental machine, D. C. Hudson, J. W. Kumpula, G. Dickson. U. S. Armed Forces Med. J. 8, No. 1, 46 (1957). 1994. A photographic personnel dosimeter for X- radiation in the range from 30 kev to beyond

1 Mev, M. Ehrlich. Radiology 68, No. 4, 549

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Signal 11, No. 7, 18 (1957).

1996. A proposed specification for dental chro- mium-cobalt casting alloys, D. F. Taylor and W. T. Sweeney. J. Am. Dental Assoc. 54, 44

(1957). 1997. A pulse method for determining dynamic

stres s- strain relations, W. Ramberg and L. K.

Irwin. Trans. DCe Congres International de Mechanique Appliquee (Brussels, Belgium) 8, 480 (1957). 1998. A reproducible and stable silver- silver oxide electrode, W. J. Hamer and D. N. Craig.

J. Electrochem. Soc. 104, 206 (1957). 1999. A service for the Nation's technology, A.

V. Astin. Mag. of Standards 28, No. 7, 196

(1957). 2000. A simple technic for making porcelain

jacket crowns, H. Sacchi and G. C. Paffenbar ger

J. Am. Dental Assoc. 54, 366 (1957). 2001. A simplified method of locating the point

of symmetry, F. E. Washer. Photo grammetric

Eng. XXIII, No. 1, 75 (1957). 2002. A technological challenge to the textile industry, R. B. Hobbs. Can. Textile J. 74, 53

(1957). 2003. A theory of the production of VLF noise

(so-called drawn chorus) by traveling wave

amplification in the exosphere of the earth, R. M. Gallet and R. A. Helliwell. Symp. on the Prop, of VLF Radio Waves, Sponsored by the NBS Boulder Laboratories and IRE Prof. Group

on Ant. Prop. , January 23-25, 1957 (Boulder, Colorado), Paper No. 20, V2 (1957). 2004. Unas signed. 2005. Abrasion resistance, R. D. Stiehler. Encyclopedia of Chemistry (Reinhold Publ. Corp. , New York, N. Y. ) p. 1 (1957). 2006. Absence of interference effects in the /3- decay of polarized CO and CO58 nuclei, E. Ambler, R. W. Hayward, D. D. Hoppes, and

R. P. Hudson. Phys. Rev. 108, 503 (1957). 2007. Absolute intensities of the 721 and 742 cm" 1 bands of C02

, H. J. Kostkowski and L. D. Kaplan. J. Chem. Phys. 26, 1252 (19 57). 2008.. Absolute measurement of Wair for sulfur- 35 beta rays, Z. Bay, H. H. Seliger, and H. O. Wyckoff. Radiation Research 7, No. 6, 558

(1957). 2009. Absolute temperature below 1°K: chromic methylammonium alum as a thermometric substance, E. Ambler and R. P. Hudson. J. Chem.

Phys. 27, 378 (1957). 2010. Absorption of sound by patches of absorbent

materials, R. K. Cook. J. Acoust. Soc. Am. 29, 329 (1957).

2011. Adsorption of C dextran to human blood

platelets and red blood cells in vitro, S. Roth- man, E. Adelson, A. Schwebel, and R. D. Langdell. Vox Sanguinis 2, 104 (1957). 2012. An adjustable sliding termination for rectangular waveguide, R. W. Beatty. IRE

Trans, on Microwave Theory and Tech. MTT-3,

192 (1957). 2013. An exact solution for a cylindrical cavity containing a gyromagnetic material, H. E. Bussey and L. A. Steinert. Proc. IRE 45, Pt. 1, 693 (1957).

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2014. An experimental study of the strength and fatigue of glass at very low temperatures,

R. H. Kropschot and R. P. Mikesell. Proc.

1956 Cryogenic Engineering Conference, Paper

D-5, p. 136. Edited by K. D. Timmerhaus,

Chemical Engineering Dept. , University of Colorado (Boulder, Colorado) (1957). 2015. An experimental test of parity conservation in beta decay, C. S. Wu, E. Ambler, R. W.

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Phys. Rev. 105, 1413 (1957). 2016. An inclusion theorem for modular groups, M. Newman. Proc. Am. Math. Soc. 8, 125

(1957). 2017. An inter comparison of the French and

U. S. roentgen ray standards, A. Allisy, L. DeLaVergne, and H. O. Wyckoff. Acta Radiol.

48, No. 6, 486 (1957). 2018. An isotopic tracer study of carbon formation in hydrocarbon flames, R. E. Ferguson. Combustion and Flame 1, No. 4, 431 (1957). 2019. An observation of audio- frequency electro- magnetic noise during a period of solar disturb- ance, J. M. Watts. J. Geophys. Research 62, 199 (1957). 2020. Analytical procedures: natural and synthetic rubbers, M. Tryon. Anal. Chem. 29, 714 (1957). 2021. Angular correlation of radiations with

parallel angular moments, U. Fano. II Nuovo

Cimento (Roma, Italy) Serie X 5, 1358 (1957). 2022. Anisotropic relaxation peak in the internal friction of crystalline quartz, J. H. Wasilik. Phys. Rev. 105, 1174 (1957). 2023. Unassigned.

2024. Annual review of pulp and paper industry, R. B. Hobbs and W. K. Wilson. Ind. Eng. Chem. 49, 42A (1957). 2025. Another milestone in screw thread

standardization, I. H. Fullmer. Fasteners

12, No. 4, 3 (1957). 2026. Unassigned.

2027. Application of configuration interaction

to the H, complex, B. J. Ransil. J. Chem.

Phys. 26, No. 4, 97 (1957). 2028. Aspects of gamma ray penetration theory

relevant to shielding problems, USNRDL Revs,

and Lectures 1, No. 29, 25 (1957). 2029. Asphalt research at the National Bureau

of Standards, H. R. Snoke. ASTM Bull. No.

220, p. 41 (1957). 2030. Asymptotic behavior of tests on the mean

of a logarithmic- normal distribution with known

variances, N. C. Severo. Ann. Math. Stat. 28, 1044 (1957). 2031. Atmospheric research, International Geophysical Year, R. J. Slutz. Americana

Annual, p. 60. (An Encyclopedia of the Events

of 1956, Americana Corp. , New York, N. Y.

(1957). 2032. Attenuation of 14. 1-Mev neutrons in water, R. S. Caswell, R. F. Gabbard, D. W.

Padgett, and W. P. Doering. Nuclear Sci. and Engr. 2, 143 (1957). 2033. Audio-frequency electromagnetic hiss re- corded at Boulder in 1956, J. M. Watts. Symp.

on Prop, of V. L. F. Radio Waves, Sponsored by

the NBS Boulder Laboratories and IRE Prof. Group on Ant. and Prop. , January 23-25, 1957 (Boulder, Colorado), Paper No. 17, V. 2; Geofis. pura e appl. (Milano, Italy) 37, 169 (1957).

2034. Automatic lens design methods, D. P. Feder. J. Opt. Soc. Am. 47, No. 10, 902

(1957). 2035. Automatic temperature regulation and recording in precision adiabatic calorimetry,

E. D. West and D. C. Ginnings. Rev. Sci. Instr. 28, 1070 (1957). 2036. Automatic timer simplifies small- current measurements, L. Costrell and F. H. Attix. Nucleonics 15, No. 2, 83 (1957). 2037. Basic standards for science and industry, R. D. Huntoon. Electronic Design 5, No. 16, 38 (1957); Proc. Conf. Instrumentation and

Control in the Process Industries, February

6-7, 1957 (Armour Research Foundation, Illi- nois Institute of Technology, Chicago, Illinois) (1957). 2038. Breathing oxygen storage dewars, W. A. Wilson. Proc. 1956 Cryogenic Engineering

Conference, Paper B-l, p. 54. Edited by K. D. Timmerhaus, Chemical Engineering Dept. , University of Colorado (Boulder, Colorado)

(1957). 2039. Bureau of Standards comments on Loran

communications, E. K. Smith. IRE Trans, on Aeronaut. Navigational Elec. ANE-4, 84 (19 57). 2040. Calcification in lysine deficiency, R. C. Likins, L. A. Bavetta, and A. S. Posner.

Arch, of Biochem. and Biophys. 70, 401 (1957). 2041. Calculation of an optical merit function and its derivatives with respect to the system

parameters, D. P. Feder. J. Opt. Soc. Am.

47, No. 10, 913 (1957). 2042. Calculation of cryoscopic data, C. P. Saylor. Anal. Chim. Acta 17, 36 (1957). 2043. Calculation of energy dissipation by gamma

radiation near the interface between two media, M. J. Berger. J. Appl. Phys. 28, No. 12, 1502 (1957). 2044. Calculations of ionospheric reflection coefficients at very low radio frequencies, J. R. Wait and L. B. Perry. J. Geophys. Research

62, No. 1, 43 (1957). 2045. Calibration of airplane cameras, F. E. Washer. Photogrammetric Eng. 23, No. 5, 890 (1957). 2046. Calibration of shock and vibration pick- ups, W. Ramberg. Noise Control 3, No. 5, 23 (1957). 2047. Calorimetric determination of the power

in a 1400 kev X-ray beam, J. McElhinney, B. Zendle, and S. R. Domen. Radiol. Research

6, No. 1, 40 (1957). 2047A. Capillary viscometry, A. B. Bestul.

J. Soc. Cosmetic Chemists 8, No. 6, 345

(1957). 2048. Catalysis of the ortho-parahydrogen con- version, D. H. Weitzel, J. W. Draper, O. E. Park, K. D. Timmerhaus, and C. C. Van Valin. Proc. 1956 Cryogenic Engineering Conference, Paper A-4, p. 12. Edited by K. D. Timmerhaus, Chemical Engineering Dept. , University

of Colorado (Boulder, Colorado) (1957). 2049. Central Radio Propagation Laboratory,

F. H. Brown. Signal 12, No. 4, 9 (1957). 2050. Changes in agar- agar type duplicating material and agar-agar on heating and storage,

P. M. Margetis and W. C. Hansen. J. Am.

Dental Assoc. 54, 737 (1957).

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19! 2051. Characteristics and present require- ments of ferrites, R. D. Harrington. Proc.

13th Ann. Meeting Metal Powder Assoc.,

April 30-May 1, 1957 (Chicago, Illinois) p. 177

(1957). 2052. Characteristics of atmospheric noise from 1 to 100 Kc/s, A. D. Watt and E. L. Maxwell. Symp. on the Prop, of V. L. F. Radio Waves, Sponsored by the NBS Boulder Laboratories and IRE Prof. Group on Ant. and Prop. , January 23-25, 1957 (Boulder, Colorado), Paper No. 35, V. 3; Proc. IRE 45, 787 (1957). 2053. Characteristics of metal- clad laminates,

D. S. Hoynes. Elec. Mfg. 59, No. 4, 104

(1957). 2054. Characteristics of some insulations for

liquid oxygen transfer lines, D. A. Van Gundy

and R. B. Jacobs. Proc. 19 56 Cryogenic

Engineering Conference, Paper E- 1 , p. 156. Edited by K. D. Timmerhaus, Chemical

Engineering Dept. , University of Colorado

(Boulder, Colorado) (1957). 2055. Characteristics of ultrasonic vibrations, W. T. Sweeney. J. Am. Dental Assoc. 55, 819 (1957). 2056. Clamp- on microammeter measures a-c

current, G. F. Montgomery and C. Stansbury. Electronics 30, No. 12, 152 (1957). 2057. Classes of positive definite unimodular

circulants, M. Newman and O. Taussky. Can.

J. Math. 9, 71 (1957). 2058. Comments on a recent paper by Deresie- wicz on plane waves in a thermoelastic solid, M. Greenspan. J. Acoust. Soc. Am. 29, 966

(1957). 2059. Comments on the attenuation versus fre- quency characteristics, J. R. Wait. Symp. on

the Prop, of V. L. F. Radio Waves, Sponsored by the NBS Boulder Laboratories and IRE Prof. Group on Ant. and Prop. , January 23-25, 1957

(Boulder, Colorado), Appendix A, V. 4, 43; Proc. IRE 45, 768(1957).

2060. Commutativity in finite matrices, O. Taussky. Am. Math. Mo. 64, 229 (1957). 2061. Comparative characteristics of mediumpriced fully automatic computers for statistical applications, M. E. Stevens and S. N. Alexander. Proc. of First Conf. on the Design of Experiments in Army Research, Development

and Testing, Office of Ordnance Research

(Durham, N. C. ) OORR 57-1 (June 19 57). 2062. Comparison of cryoscopic determinations

of purity of benzene by thermometric and calor- imetric procedures, A. R. Glasgow, Jr. , G. S. Ross, A. T. Horton, D. Enagonio, H. D. Dixon, C. P. Saylor, G. T. Furukawa, M. L.

Reilly, and J. M. Henning. Anal. Chim. Acta

17, 54 (1957); Proc. I. U. P. A. C. , Inter- national Symp. on Purity Control by Thermal

Analysis (Amsterdam, The Netherlands)

(1957). 2063. Comparison of mechanical properties of

flag sheets, molded shapes, and postformed

shapes of cotton fabric- phenolic laminates,

F. W. Reinhart, C. L. Good, P. S. Turner,

and I. Wolock. Natl. Advisory Comm. for Aeronaut. Tech. Note 3825 (1957).

2064. Complete night of vertical- incidence ionosphere soundings covering frequency range from 50 Kc/s to 25 Mc/s, J. M. Watts. J. Geophys. Research 62, 484 (1957). 2065. Complete sequences and approximations

in normed linear spaces, P. Davis and K. Fan. Duke Math. J. 24, 183 (1957). 2066. Computation of effective intensity of flashing lights, C. A. Douglas. Ilium. Eng. 52, No. 12, 641 (1957). 2067. Condensation interfaces in two- phase

flows, P. Chiarulli and R. F. Dressier. J. Appl. Phys. 28, 990 (1957). 2068. Congruences for the coefficients of modular forms and some new congruences for

the partition function, M. Newman. Can. J. Math. 9, 549 (1957). 2069. Construction and application of a class of modular functions, M. Newman. Proc. London

Math. Soc. 7, 334 (1957). 2070. Conversion of payroll processes at the National Bureau of Standards from manual to punched cards, P. R. McClennon. Federal

Accountant 7, No. 2, 64 (1957). 2071. Creep behavior of structural joints of aircraft materials under constant loads and temperatures, L. Mordfin and A. C. Legate.

Natl. Advisory Comm. Aeronaut. Tech. Note

3842 (1957). 2072. Creep of crystalline nonmetals, J. B. Wachtman, Jr. Am. Soc. Metals Symp. , Oct. 6, 1956, Creep and Recovery p. 344 (1957). 2073. Cryogenic characteristics of wire resist- ance strain gages, R. M. McClintock. Proc.

1956 Cryogenic Engineering Conference, Paper

E-4, p. 172. Edited by K. D. Timmerhaus,

Chemical Engineering Dept. , University of Colorado (Boulder, Colorado) (1957). 2074. Crystal mount and techniques for measuring high frequency induced electroluminescence,

G. G. Harman. Rev. Sci. Instr. 28, No. 2, 127 (1957). 2075. Current situation with regard to per- missible radiation exposure levels, L. S. Taylor. Radiology 69, No. 1, 6 (1957). 2076. Cutting characteristics of dental burs as shown by high speed photomicrography, J. L. Hartley, D. C. Hudson, W. T. Sweeney, and W. P. Richardson. U. S. Armed Forces Med.

J. 8, 209 (1957). 2077. Density expansions of distribution functions. I. Virial expansion for finite closed systems; canonical ensemble, I. Oppenheim

and P. Mazur. Physica 23, 197 (1957). 2078. Density expansions of distribution functions. II. Density expansions in the grand

canonical ensemble, I. Oppenheim and P. Mazur.

Physica 23, 216 (1957). 2079. Dental Research, G. C. Paffenbarger. Pub. in Book "Developments in Dentistry During the Last 25 Years," Med. Digest of India (Bombay, India), p. 351 (1957). 2080. Description of color, D. B. Judd. Proc. Perkin Centennial (Ogden Printing Co. , New

York, N. Y.) (1957). 2081. Description of states in quantum mechanics

by density matrix and operator techniques, U. Fano. Rev. Modern Phys. 29, No. 1, 74 (1957).

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2082. Design and performance of a portable

infiltration meter, C. W. Coblentz, and P. R. Achenbach. Heating, Piping, Air Conditioning

29, No. 7, 155 (1957); Trans. Am. Soc. Heating and Air Conditioning Engrs. , Paper 477

(1957). 2083. Design of experiments in research and development, W. J. Youden. Proc. of Conference on Design of Experiments in Army Research, Development, and Testing, Office of Ordnance Research Report 57-1 (Durham, N.

C. ) p. 9 (1957). 2084. Development of craze and impact resist- ance in glazing plastics by multiaxial stretching, G. M. Kline, I. Wolock, B. M. Axilrod, M. A. Sherman, D. A. George, and V. Cohen.

Natl. Advisory Comm. Aeronaut. Tech. Report 1290 (1957). 2085. Development of methods for evaluation

of rotating dental diamond abrasive instruments,

J. L. Hartley, D. C. Hudson, W. T. Sweeney,

and G. Dickson. J. Am. Dental Assoc. 54, 637 (1957). 2086. Diffraction of a spherical wave pulse by

a half plane screen, J. R. Wait. Can. J. Phys.

35, No. 5, 693 (1957). 2087. Diffusion of particles with memory, P. L. Bender. Proc. Natl. Acad. Sci. 43, No. 5, 412 (1957). 2088. Dimensions, units, and standards, A. G. McNish. Phys. Today 10, No. 4, 19 (1957). 2089. Dipole moment of perchloryl fluoride, A. A. Maryott and S. J. Kryder. J.Chem. Phys.

27, No. 5, 1221 (1957). 2090. Direct- coupled power amplifier for cryostat heating control, R. D. Goodwin and J. R.

Prucell. Rev. Sci. Instr. 26, 581 (1957). 2091. Disaster monitoring with amateur photo- graphic film and with dental X-ray film, M.

Ehrlich. Radiology 68, No. 2, 251 (1957). 2092. Discussion of paper "Pressure- flow

characteristics of pneumatic valves" by F. D. Ezekiel and J. L. Shearer, D. H. Tsai. ASME

Trans. 79, 1589 (1957). 2093. Distillation of hydrogen- deuterium mixtures, T. M. Flynn, D. H. Weitzel, K. D. Timmerhaus, P. C. Vander Arend, and J. W.

Draper. Proc. 1956 Cryogenic Engineering

Conference, Paper A-6, p. 39. Edited by K.

D. Timmerhaus, Chemical Engineering Dept. , University of Colorado (Boulder, Colorado)

(1957). 2094. Does rationalization change units? F. B.

Silsbee. Elec. Eng. 76, 4 (1957). 2095. Early history and development of building codes, J. P. Thompson. BOCA News (Published by the Building Officials Conference of America, Inc.) 6, No. 1, 2 (1957). 2096. Effect of crystal orientation on fatigue- crack initiation in polycrystalline aluminum

alloys, J. G. Weinberg and J. A. Bennett.

Natl. Advisory Comm. Aeronaut. Tech. Note

3990 (1957). 2097. Effect of illumination on the oxidation of copper single crystals in water, J. Kruger.

J. Appl. Phys. 28, No. 10, 1212 (1957). 2098. Effect of microwave signals incident upon

different regions of a dc hydrogen glow, B. J. Udelson. J. Appl. Phys. Letter to Editor 28, No. 3, 380 (1957).

2099. Effect of new lower permissible exposure

levels on use of radioactive isotopes, L. S. Taylor. Proc. United Nations Educational,

Scientific and Cultural Organization Conf. , Paris, France (Sept. 1957); Impact 8, 209

(1957). 2100. Effect of super- refractive layers on

tropospheric signal characteristics in the Pacific coast region, A. P. Barsis and F. M.

Capps. IRE Wescon Conv. Record 1, Pt. I, 116 (1957). 2101. Effective intensity of flashing lights, T. H. Projector. Ilium. Eng. 52, No. 12, 630 (1957). 2102. Effects of boundary and inhomogeneities on the penetration of gamma radiation, M. J. Berger. USNRDL Revs, and Lectures 1, No.

29, 47 (1957). 2103. Elastic distortion error in the dead

weight piston gage, D. P. Johnson, J. L. Cross, J. P. Hill, and H. A. Bowman. Ind. Eng. Chem. 49, 2046 (1957). 2104. Elastic waves in anisotropic media, J. L. Synge. J. Math. Phys. 35, 323 (1957). 2105. Electrical properties of samarium doped barium titanate, G. G. Harman. Phys. Rev.

106, No. 6, 1358 (1957). 2106. Electrodeposition of metals from organic

solutions. III. Preparation and electrolysis of titanium and zirconium compounds in nonaqueous media, W. E. Reid, Jr. , J. M. Bish, and A. Brenner. J. Electrochem. Soc. 104, No. 1, 21 (1957). 2107. Electrodeposition of metals from organic

solutions. IV. Electrodeposition of beryllium

and beryllium alloys, G. B. Wood and A. Brenner. J. Electrochem. Soc. 104, No. 1, 29

(1957). 2108. Electrodeposition of metals from organic

solutions. V. Electrodeposition of magnesium alloys, J. H. Connor, W. E. Reid, Jr., and G. B. Wood. J. Electrochem. Soc. 104, 38 (1957). 2109. Electron scattering phenomena, L. Marton. J. Sci. Ind. Research 16a, No. 6, 221

(1957). 2110. Emissivities of metallic surfaces at 76°K, M. M. Fulk and M. M. Reynolds. J. Appl. Phys. 28, 1464 (1957). 2111. Energy and angular distribution of X-rays

scattered in lead, J. H. Hubbell and E. V. Hay- ward and W. F. Titus. Phys. Rev. 108, No. 6, 1361 (1957). 2112. Evaluation of analytical methods by the

sensitivity criterion, J. Mandel and R. D.

Stiehler. Anal. Chem. 29, 17A(1957).

2113. Evaluation of width of cracks in concrete

at the surface of reinforcing steel by means of tensile bond specimens, D. Watstein, and R. G. Mathey. Proc. RILEM Symp. on Bond and Crack Formation of Reinforced Concrete (Stock- holm, Sweden) (1957). 2114. Excess noise in microwave crystal diodes used as rectifiers and harmonic generators,

J. M. Richardson and J. J. Faris. IRE Trans, on Microwave Theory and Tech. MTT-5, No. 3, 208 (1957).

130
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for inequalities concerning convex functions or

linear transforms, K. Fan. Math. Z. (Berlin, Germany) 68, 205 (1957). 2116. Experiences with incomplete block designs: examples, W. S. Connor. Proc. Symp. on the Design of Industrial Experiments, North Carolina

State College (John Wiley & Sons, New York,

N. Y.) p. 193 (1957). 2117. Experimental equipment for communication utilizing meteor bursts, R. G. Ochs and R.

J. Carpenter. IRE WESCON Conv. Session

46: Ionospheric Prop., August 20-23, 1957, San Francisco, California, IRE WESCON Conv. Record, Pt. 1, 283 (1957). 2118. Unassigned.

2119. Experiments in processing pictorial information with a digital computer, R. A. Kirsch, L. Cahn, L. C. Ray, and G. H. Urban.

1957 Eastern Joint Computer Conf. Proc.

(Washington, D. C.)(1957).

2120. Experiments with many factors, M.

Zelen. Proc. 3d Annual Statistical Engineering Symp. (Chemical Center, Md. ) p. 1 (1957). 2121. Field- strength variations recorded on a VHF ionospheric scatter circuit during the solar event of February 23, 1956, H. I. Leighton. J. Geophys. Research Letter to Editor 62, 483 (1957). 2122. Finding chemical records by digital computers, L. C. Ray and R. A. Kirsch.

Science 126, No. 3278, 814 (1957). 2123. Fire extinguishment by means of dry powder, C. S. McCamy, H. Shoub, and T. G. Lee, Proc. 6th Symp. (International) on Combustion (Reinhold Pub. Corp. , New York,

N. Y.) p. 795 (1957). 2124. Fire research at the National Bureau of Standards, A. F. Robertson. Proc. Fire Research, 1st Correlation Conf. 1956, Natl. Academy of Sci. Publ. No. 475, p. 40 (1957). 2125. Fitting a straight line to certain types

of cumulative data, J. Mandel. J. Am. Stat. Assoc. 52, 552 (1957). 2126. Flexibility of thin porcelain enameled

sheet steel, A. G. Eubanks, J. R. Crandall,

J. C. Richmond. Bull. Am. Ceram. Soc. 36, No. 2, 59 (1957). 2127. Forecasting of disturbed HF communication conditions, R. C. Moore. J. Atmospheric

and Terrest. Phys. Special Suppl. 1957 Proc.

of the Polar Atmosphere Symp., July 2-8, 1956 (Oslo, Norway) Pt. II, 147 (1957). 2128. Formal procedures for connecting terminals with a minimum total wire length, H. Loberman and A. Weinberger. J. Assoc. Computing Machinery 4, No. 4, 428 (1957). 2129. Frozen free radicals, C. M. Herzfeld

and A. M. Bass. Sci. American 3, 91 (1957). 2130. Frozen free radicals: The problem and

the program at the National Bureau of Standards, L. T. Milliken. Capital Chemist

7, No. 8, 244 (1957). 2131. Fungicidal effectiveness of compounds

applied to leather, S. Dahl and A. M. Kaplan.

J. Am. Leather Chemists Assoc. 52, 536

(1957). 2132. Further experiments on P - decay of polarized nuclei, E. Ambler, R. W. Hayward,

D. D. Hoppes, R. P. Hudson, and C. S. Wu.

Phys. Rev. 106, No. 6, 1361 (1957).

2133. Further studies of an electron thickness

gage: circuitry operating characteristics, and

calibration, F. P. Brodell and A. Brenner.

Plating 44, 591 (1957). 2134. Gaging and testing farm milk tanks, M.

W. Jensen. Proc. Natl. Conf. Milk (Bulk) Handling (Michigan State University, Lansing, Michigan) p. 62 (1957). 2135. Galvanomagnetic effects in n-type indium

antimonide, H. P. R. Frederikse and W. R.

Hosier. Phys. Rev. 108, 1136 (1957). 2136. Galvanomagnetic effects in p-type indium

antimonide, H. P. R. Frederikse and W. R. Hosier. Phys. Rev. 108, 1146 (1957). 2137. Games with random payoff matrices, A.

J. Goldman. Summary Rept. 3d Conf. on Games, ONR Logistics Project (Princeton

University, Princeton, N. J.) (1957). 2138. Gamma irradiation of polymethyl methacrylate and polystyrene, L. A. Wall and D. W.

Brown. J. Phys. Chem. 61, 129 (1957). 2139. Gamma-ray spectroscopy, H. W. Koch. Chapter 15, Trace Analysis, Edited by Yoe & Koch (John Wiley & Sons, Inc. , New York, N.

Y. ) p. 413 (1957). 2140. Generation of Bessel Functions on high speed computers, I. A. Stegun and M.

Abramowitz. Math. Tables and Other Aids to Computation, 11, 255 (1957). 2141. Geographic distribution of geophysical

stations on the polar cap, A. H. Shapley. J. Atmospheric and Terrest. Phys. Special Suppl. 1957, Proc. of the Polar Atmosphere Symp. , July 2-8, 1956 (Oslo, Norway) Pt. II, 108

(1957). 2142. Glass formation in polymers: I. The glass

transitions of the poly-(n-alkyl methacrylates),

S. S. Rogers and L. Mandelkern. J. Phys. Chem. 61, 985 (1957). 2143. Gloss measurement— past, present, and

future, H. K. Hammond, III. Am. Paint J. 41, No. 37, 94 (1957). 2144. Government and industry use of common

standards, A. T. McPherson. Proc. of the Eighth Natl. Conf. on Standards (Am. Std. Assoc. ), p. 26, (1957). 2145. Graphical solution of the single- degree-of- freedom vibration problem with arbitrary damping and restoring forces, W. H. Pell. J. Appl. Mech. 24, No. 2, 311 (1957). 2146. Head regulator for cutoff valve, L. Bean.

Anal. Chem. 29, No. 6, 98 (1957). 2147. Heat transfer through foams and powders, M. M. Fulk, R. J. Devereaux, and J. E.

Schrodt. Proc. 1956 Cryogenic Engineering

Conference, Paper E-3, p. 166. Edited by K.

D. Timmerhaus, Chemical Engineering Dept., University of Colorado (Boulder, Colorado)

(1957). 2148. Heats of combustion of some peroxides and the heats of formation of acetate, propionate, and butyrate radicals, I. Jaffe, E. J. Prosen , M. Szwarc. J. Chem. Phys. 27, 416 (1957). 2149. Heats of wetting of modified collagen and

other materials, J. R. Kanagy and J. M. Cassel.

J. Am. Leather Chemists Assoc. 52, 248

(1957). 2150. Henry Norris Russell, C. E. Moore.

The Observatory 77, No. 897, 67 (1957).

131
2151. Hexafluorobenzene from the pyrolysis of tribromofluoromethane, M. Hellman, E. Peters, W. J. Pummer, and L. A. Wall. J. Am. Chem. Soc. 79, 5654 (1957). 2152. High-dispersion spectra of mars, C. C. Kiess, C. H. Corliss, H. K. Kiess, E. L. R.

Corliss. Astrophys. J. 126, No. 3, 579 (1957). 2153. High-order harmonics for X-band

oscillator stabilization, M. C. Thompson, Jr. , and

J. V. Cateora. Rev. Sci. Instr. 28, 656 (1957). 2154. High pressure gas handling equipment for autoclaves in chemical research, R. D. Goodwin.

Ind. Engr. Chem. 49, 861 (1957). 2155. High- repetition- rate mercury pulser,

L. Costrell. Nucleonics 15, No. 11, 112

(1957). 2156. Hydrogen liquefaction by a dual pressure

process, D. B. Chelton, J. Macinko, and J. Dean. Refrig. Eng. 65, No. 8, 39 (1957). 2157. Increased rate of liquefaction of the National Bureau of Standards helium liquefier, D. B. Lawson. Rev. Sci. Instr. 28, 204 (1957). 2158. Inelastic scattering of 20-kev electrons in metal vapors, L. B. Leder. Phys. Rev. 107, No. 6, 1569 (1957). 2159. Influence of temperature on the adsorption

of chrome (C^C^) by calf skin squares, J. R. Kanagy . J. Am. Leather Chemists Assoc. 52, 142 (1957). 2160. Infrared absorption spectra of urea,

thiourea, and some thiourea- alkali halide complexes, J. E. Stewart. J. Chem. Phys. 26, 248 (1957). 2161. Infrared and raman spectra of transfluorodichloroethylene, E. K. Plyler and D. E. Mann. J. Chem. Phys. 26, 773 (1957). 2162. Infrared spectrum of carbonyl sulfide, H. C. Allen, Jr. , E. K. Plyler, and L. R.

Blaine. J. Chem. Phys. 26, No. 2, 400 (1957). 2163. Intermittent communications with a

fluctuating signal, G. F. Montgomery. Proc. IRE 45, No. 12, 1684 (1957). 2164. International textile work shows fast progress, W. D. Appel. Mag. of Standards 28, 38

(1957). 2165. Introduction to the VLF papers, J. R. Wait. Proc. IRE 45, 739 (19 57). 2166. Investigations of the properties of corrugated diaphragms, W.. A. Wildhack, R. F. Dressier, and E. C. Lloyd. Trans. Am. Soc. Mech. Engrs., 79, 56 (1957). 2167. Invited discussion on the Haringx diaphragm theory, R. F. Dressier. Trans. Am. Soc. Mech. Engrs. 79, No. 1, 61 (1957). 2168. Ionization and dissociation of hexafluoro- benzene by electron impact, V. H. Dibeler, R. M. Reese, and F. L. Mohler. J. Chem.

Phys. 26, No. 2, 304 (1957). 2169. Ionization and dissociation of oxygen di- fluoride by electron impact, V. H. Dibeler, R. M. Reese, and J. L. Franklin. J. Chem.

Phys. 27, 1296 (1957). 2170. Ionization and dissociation of perchlorylfluoride by electron impact, V. H. Dibeler, R. M. Reese, and D. E. Mann. J. Chem. Phys.

27, 176 (1957). 2171. Ionospheric forward scatter, K. L. Bowles. Annals of the International Geophysical

Year, 3, Pt. 4, p. 346 (1957).

2172. Ionospheric reflection coefficients at VLF, A. G. Jean, L. J. Lange, and J. R. Wait. Symp. on the Prop, of V. L. F. Radio Waves,

Sponsored by the NBS Boulder Laboratories and IRE Prof. Group on Ant. and Prop. , January

23-25, 1957 (Boulder, Colorado), Paper No. 31, V. 3. 2173. Ionospheric vertical soundings, J. W.

Wright, R. W. Knecht, and K. Davies. Annals

of the International Geophysical Year, 3, Pt. 1,

1 (Pergamon Press, New York, N. Y. ) (IGY

Instruction Manual: The Ionosphere, Pt. 1) (1957). 2174. Kinetics of the reaction between nickel and chlorine above 1,100°K, J. D. McKinley,

Jr. , and K. E. Shuler. Proc. International Meeting of Chemistry (Paris, France), Section de Chimie Minerale, p. 637 (1957). 2175. Lattice energies of ionic cubic crystals, C. E. Weir. Phys. Rev. 108, No. 1, 19 (1957). 2176. Light scattering measurements of a fractionated nonionic detergent, L. M. Kushner, W. D. Hubbard, and A. Doan. J. Phys. Chem.

61, 371 (1957). 2177. Long distance transfer of liquefied gases, R. B. Jacobs. Proc. 1956 Cryogenic Engineering Conference, Paper G-7, p. 303. Edited by

K. D. Timmerhaus, Chemical Engineering

Dept. , University of Colorado (Boulder, Colorado) (1957). 2178. Low- cost microvolt potentiometer, W. H. Wood. Rev. Sci. Instr. 28, No. 3, 202 (1957). 2179. Low frequency standard transmission, W. D. George. Proc. 1 1th Annual Symp. on

Freq. Control, May 7-9, 1957 (Fort Monmonth,

N. J.) p. 574 (1957). 2180. Low temperature physics, E. Ambler.

Science, 126, 1096 (1957). 2181. Low- temperature thermal conductivity of some commercial coppers, R. L. Powell,

H. M. Roder, and W. M. Rogers. J. Appl. Phys. 28, 1282 (1957). 2182. Luminescence de L'azote solide (4,2°K)

contenant des atomes ou radicaux libres, H.

P. Broida. Effet de la dilution par L'argon ( 1

), Le J. de Physique et le radium (Paris, France)

18, 593 (1957). 2183. Luminous reaction between carbon monoxide and atomic nitrogen, H. P. Broida

and D. F. Heath. J. Chem. Phys. 26, 1352

(1957). 2184. Materials for small, oil- free bearings,

H. S. White. Materials and Methods 45, No. 4, 135 (1957). 2185. Unassigned.

2186. Mathematics--a note on values of a quadratic form, M. Marcus. J. Wash. Acad.

Sci. 47, No. 4, 97 (1957). 2187. Maximum permissible radiation exposures

to man, Lk S. Taylor. Radiation Research 6, No. 4, 513 (1957); Radiology 68, No. 2, 260

(1957). 2188. Measured statistical characteristics of VLF atmospheric radio noise, A. D. Watt and and E. L. Maxwell. Proc. IRE 45, 55 (1957). 2189. Measurement of a service area for tele- vision broadcasting, R. S. Kirby. IRE

Trans. Broadcast Transmission Systems BTS-7,

23 (1957).

132
2190. Measurement of atmospheric noise, W.

Q. Crichlow, G. Foldes, F. J. Hewitt, F. Horner, H. Shinkawa, and A. W. Sullivan. Recommendation No. 1 and Annex, Proc. XHth

Gen. Assembly International Sci. Radio Union, Boulder, Colorado, August 22-September 5, 1957, XI, Pt. 4, 99, 1957. U. R.S.I. (Intern.

Sci. Radio Union) Info. Bull. No. 105, 10 (September- October 1957). 2191. Measurement of voltage ratio at audio

frequencies, W. C. Sze. Commun. Electronic

32, 444 (1957). 2192. Measuring with the electron, L. Marton.

J. Sci. Ind. Research 16A, No. 10, 429 (1957). 2193. Mechanical properties of some engineering materials, R. H. Kropschot, R. M. McClintock, and D. A. Van Gundy. Proc. 1956 Cryogenic Engineering Conference, Paper C-2, p. 93. Edited by K. D. Timmerhaus, Chemical Engineering Dept. , University of Colorado (Boulder, Colorado) (1957). 2194. Mechanism of high energy radiation

effects in polymers, R. Simha and L. A. Wall.

J. Chem. Phys. 61, 425 (1957). 2195. Mechanism of transition at subsonic

speeds, G. B. Schubauer. Proc. Symp. on Boundary Layer Research, Intern. Union for Theo. and Appl. Research, August 26-29, 1957, (Freiburg, Germany) p. 85 (1957). 2196. Unassigned.

2197. Medida del color en la industria, D. B. Judd. Boletin Iberomericano de Cultura Tecnica (Madrid, Spain) 1, 13 (1957). 2198. Micromethylation of polysaccharides,

H. S. Isbell, H. L. Frush, B. H. Bruckner,

G. N. Kowkabany, and G. "Wampler. Anal. Chem. 29, 1523 (1957). 2199. Microstructure of the human tooth, A. The dentinoenamel junction, F. L. Losee, W. H. Jennings, and M. E. Lawson, Jr. J. Dental Research 36, No. 6, 911 (1957). 2200. Microwave measurements of the properties

of a dc hydrogen discharge, B. J. Udelson,

J. E. Creedon, and J. C. French. J. Appl. Phys. 28, No. 6, 717 (1957). 2201. Microwave power measurements employing electron beam techniques, H. A. Thomas.

Proc. IRE 45, No. 2, 205 (1957). 2202. Microwave spectra of molecules exhibiting internal rotation. I. Propylene, D. R. Lide,

Jr., and D. E. Mann. J. Chem. Phys. 27, 868

(1957); II. Methylallene, J. Chem. Phys. 27, 874 (1957). 2203. Mode calculations for V. L. F. ionospheric

propagation, H. H. Howe and J. R. Wait. Symp.

on the Prop, of V.L.F. Radio Waves, Sponsored by the NBS Boulder Laboratories and IRE Prof. Group on Ant. and Prop. , January 23-25, 1957

(Boulder, Colorado), Paper No. 3 6, V. 3; Further comments, V. 4, 91. 2204. Modern batteries, W. J. Hamer. IRE

Trans. Component Parts CP-4, No. 3, 86

(1957). 2205. Molecules in the solar spectrum, H. P. Broida and C. E. Moore. 7th Intern. Astrophys. Symp. Proc. Memoirs of Royal Soc. (Liege, Belgium) Series 4, Vol. 18, 217 (1957). 2206. Multichannel pulse height analyzers, H. W. Koch and R. W. Johnston. Natl. Acad. Sci. - Natl. Research Council Publ. 467 (1957).

2207. Multi- factor experiments for evaluating

reliability, M. Zelen. Proc. of Joint Military

Industry Guided Missile Reliability Symp.

(Point Mugu, California) p. 2-17 (1957). 2208. National Bureau of Standards equatorial region V. H. F. scatter research program for the I. G. Y. , K. L. Bowles and R. S. Cohen. QST 41, 11 (1957). 2209. National physical standards and design

of experiment, W. J. Youden. Bull.Inter- national Statistical Inst. 35, 191 (1957). 2210. Negative ions, L. M. Branscomb.

Chapter in Advances in Electronics and Electron Physics (Academic Press Inc., New York, N. Y.

)

(1957). 2211. Neutron- insensitive gamma- ray dosi- meter, R. S. Caswell. Radiology 68, 101

(1957). 2212. New federal standard on colors, H. J. Keegan. J. Opt. Soc. Am. 47, 330 (1957). 2213. New standard wind load requirements,

J. P. Thompson. Eng. News-Record 158, No. 6, 33 (1957). 2214. New ultra high strength steel, S. J. Rosenberg and C. R. Irish. Materials and Methods 45, 145 (1957). 2215. Noise control requirements in building codes, R. V. Waterhouse. Chapter 40, Hand- book of Noise Control (McGraw Hill, New York,

N. Y.) (1957). 2216. Noise investigation at V. L. F. by the National Bureau of Standards, W. Q. Crichlow. Symp. on the Prop, of V. L. F. Radio Waves,

Sponsored by the NBS Boulder Laboratories and IRE Prof. Group on Ant. and Prop. , January

23-25, 1957 (Boulder, Colorado), Paper No. 42, V. 3; Proc. IRE 45, 778 (1957). 2217. Nonresonant absorption of symmetric top molecules: Shape of the nonresonant spectra,

G. Birnbaum. J. Chem. Phys. 27, 360 (1957). 2218. Note on bounds for certain determinants, E. V. Haynsworth. Duke Math J. 24, No. 3, 313 (1957). 2219. Note on L. F. portable antennas operating over ice and snow covered terrain, J. R. Wait. Symp. on the Prop, of V. L. F. Radio Waves,

Sponsored by the NBS Boulder Laboratories and IRE Prof. Group on Ant. and Prop. , January

23-25, 1957 (Boulder, Colorado), Appendix C,

V. 4, 62. 2220. Note on the dielectric properties of magnesium- strontium titanates, S. Marzullo

and E. N. Bunting. J. Am. Chem. Soc. 40, No. 8, 285 (1957). 2221. X, band of methane, H. C. Allen, Jr. and E. K. Plyler. J. Chem. Phys. Letters 26, No. 4, 972 (1957). 2222. On matrix classes corresponding to an

ideal and its inverse, O. Taussky. Illinois J. Math. 1, 108 (1957). 2223. On prediction of system performance from

information on component performance, J. R.

Rosenblatt. Proc. IRE Western Joint Computer

Conf. (Los Angeles, California), p. 85 (1957). 2224. On small precision bottles of quartz and

low-loss glass, S. Ruthberg, and E. I. Klein. Rev. Sci. Instr. 28, No. 3, 205 (1957).

133
2225. On some aspects of prediction in the study

of complex systems, J. R. Rosenblatt. Proc.

of the NYU-RCA Working Conf. on Theory of Reliability, (Ardsley-on- Hudson, N. Y. ) p. 24

(1957). 2226. On standard methods of measurement in architectural acoustics, R. V. Waterhouse. J. Acoust. Soc. Am. 29, 544 (1957). 2227. On subdeterminants of doubly stochastic matrices, M. Marcus. Illinois J. Math. 1, 583

(1957). 2228. On the atmospheric dynamo theory, M. L. White. J. Geophys. Research 62, 329 (1957). 2229. On the Hilbert matrix T. Kato. Proc. Am. Math. Soc. 8, 73 (1957). 2230. On the identity relationship for fractional replicates of the 2 n series, R. C. Burton and W. S. Connor. Ann. Math. Stat. 28, 3 (1957). 2231. On the independence of tests of randomness

and other hypotheses, I. R. Savage. J. Am.

Stat. Assoc. 52, 53 (1957). 2232. On the low rates of equilibration in dialysis experiments with ionic surface-active agents,

L. M. Kushner and R. A. Parker. J. Phys. Chem. 61, 822 (1957). 2233. On the measurement of the conductivity of a fluid contained in a cylindrical vessel, J. R. Wait. Can. J. Technol. 34, 410 (1957). 2234. On the mode theory of VLF ionospheric

propagation, J. R. Wait. Geofis. pura e appl. (Milan, Italy) 37, 103 (1957). 2235. On the relaxation of vibrational nonequili- brium distributions, III: The effect of radiative

transitions on the relaxation behavior, R. J. Rubin and K. E. Shuler. J. Chem. Phys. 26, No. 1, 137 (1957). 2236. On the representation of a certain integral , involving Bessel functions by hypergeometric

series, P. Henrici, J. Math. Phys. 36, No. 2, 151 (1957). 2237. On the specification of transient nonequili- brium systems, K. E. Shuler. 6th Intern. Symp.

on Combustion (Reinhold Publ. Corp. , New York,

N. Y. ) p. 371 (1957). 2238. On the theory of reflection from a wire

grid parallel to an interface between homogeneous media, J. R. Wait. Appl. Sci. Research

Section B, 6, 259 (1957). 2239. Unassigned.

2240. Organizing a network of computers to meet

deadlines, A. L. Leiner, W. A. Notz, J. L. Smith, and A. Weinberger. 1957 Eastern Joint Computer Conf. Proc. (Washington, D. C. ) p.

115 (1957). 2241. Oxygen and water vapor absorption of radio waves in the atmosphere, B. R. Bean and

R. Abbott. Geofis. pura e appl. (Milan, Italy) 37, 127 (1957). 2242. Pairs of matrices of order two which

generate free groups, K. Goldberg and M. Newman. Illinois J. Math. 1, No. 3, 446 (1957). 2242A. pH and the modern analyst, R. G. Bates, Anal. Chem. 29, 15A (1957). 2243. Performance of pumps with liquefied gases, K. B. Martin, R. B. Jacobs, and R. J. Hardy.

Proc. 1956 Cryogenic Engineering Conference, Paper G- 6, p. 295. Edited by K. D. Timmerhaus,

Chemical Engineering Dept. , University of Colorado (Boulder, Colorado) (1957).

2244. Performance of three-millimeter harmonic

generators and crystal detectors, J. M. Richardson and R. B. Riley, IRE Trans, on Microwave

Theory and Tech. MTT-5, 131 (1957). 2245. Photodetachment of atmospheric negative

ions, L. M. Brans comb. Conf. on Chem. Aeronomy (Pergamon Press, London, England)

(1957). 2246. Photodetachment studies of negative ions, L. M. Branscomb, S. J. Smith, D. S. Burch, and S. Geltman. Third Intern. Conf. on Ionization Phenomena in Gases. Societa Italiana di Fiscia (Venice, Italy) (1957). 2247. Photometric observations of the airglow,

F. E. Roach. Annals Intern. Geophys. Year 4, Pt. 1, 115 (1957). 2248. Photon self-absorption and scattering by

the 15.1-Mev level in C12

, E. V. Hayward and

E. G. Fuller. Phys. Rev. 106, 991 (1957). 2249. Photoneutron yields in the rare earth

region, B. Petree, M. S. Weiss, and E. G. Fuller. Bull. Am. Phys. Soc. Ser. n, No.

2, 16 (1957). 2250. Photoproduction of neutral mesons from

carbon near threshold, J. E. Leiss. Am. Phys.

Soc. Ser. II, No. 2, 6 (1957). 2251. Physics--the elasticity of rubber, L. A. Wood. J. Wash. Acad. Sci. 47, No. 9, 281

(1957). 2252. Piezoresistance of indium antimonide, R.

F. Potter. Phys. Rev. 108, No. 3, 652 (1957). 2253. Plastic deformation of ceramic-oxide

single crystals, II., J. B. Wachtman, Jr., and

L. H. Maxwell. J. Am. Ceram. Soc. 40, No.

11, 377 (1957). 2254. Plastics, F. W. Reinhart, The Encyclopedia of Chemistry (Reinhold Publ. Corp., New1 York, N. Y. ) p. 756 (1957). 2255. Plastics for aircraft. Part II. Transparent glazing materials, G. M. Kline, I. Wolock, and I. G. Callomon. Army- Navy- Commerce Bull. ANC-17 (1957). 2256. Polar blackout occurence patterns, V. Agy.

J. Atmospheric and Terrest. Phys. Special

Suppl. 1957, Proc. of the Polar Atmospheric Symp. July 2-8, 1956 (Oslo, Norway) Pt. II, 129 (1957). 2257. Polarization of sferics, A. G. Jean, L.

J. Lange, and J. R. Wait. Symp. on the Prop,

of V. L. F. Radio Waves, Sponsored by the NBS

Boulder Laboratories and IRE Prof. Group on

Ant. and Prop. , January 23-25, 1957 (Boulder, Colorado) Abstracts, Paper No. 32, V. 3 (1957), 2258. Polarographic determination of trace

quantities of iodide, S. W. Smith and J. K.

Taylor. Anal. Chem. 29, 301 (1957). 2259. Practical suggestions for reducing

radiation exposure in diagnostic examinations,

L. S. Taylor. Am. J. Roentgenol. Radium

Therapy Nuclear Med. 78, No. 6, 983 (1957). 2260. Precise intercomparison of acids by

differential potentiometric titration with the hydrogen electrode, R. G. Bates and E. Wichers. Actas Do Congress (Lisboa, Portugal) 1, 3 (1957). 2261. Precision measurement, I. C. Gardner. Ordnance XLI, 222 (1957). 2262. Preparation of carbon- 14- labeled cyanide,

J. D. Moyer and H. S. Isbell. Anal. Chem.

29, 393 (1957).

134
2263. Present status of research on the physical

constants at the (United States) National Bureau

of Standards, R. D. Huntoon and A. G. McNish.

N. 1 del supplemento Vol. 6, Serie X, H Nuovo

Cimento (Bologna, Italy,) p. 146 (19 57). 2264. Prism effect, camera tipping, and tan- gential distortion, F. E. Washer. Photogrammetric Engr. 23, No. 4, 721 (1957). 2265. Propagation of a pulse across a coast

line, J. R. Wait. Proc. IRE 45, 1550 (1957). 2266. Propagation of errors in tristimulus colorimetry, I. Nimeroff. J. Opt. Soc. Am.

47, 697 (1957). 2267. Propagation of the radiofrequency ground wave transient sinusoidal over a finitely conducting plane earth, J. R. Johler. Symp. on

the Prop, of V. L. F. Radio Waves, Sponsored

by the NBS Boulder Laboratories and IRE Prof. Group on Ant. and Prop. , January 23-25, 1957 (Boulder, Colorado), Paper No. 16, V. 2; Geofis. pura e appl. (Milano, Italy), 37, 116 (1957). 2268. Properties of materials at low temperatures

R. J. Corruccini. Chem. Eng. Progr. 53, Pt.

I, No. 6, 262; Pt. II, No. 7, 343; Pt. Ill, No. 8, 397 (1957). 2269. Properties of Struve functions, R. K. Cook.

J. Wash. Acad. Sci. 47, 365 (1957). 2270. Proposal for standard frequency broadcast

at very low frequency, W. D. George. Symp. on

the Prop, of V. L. F. Radio Waves, Sponsored by

the NBS Boulder Laboratories and IRE Prof. I Group on Ant. and Prop. , January 23-25, 1957 (Boulder, Colorado), Paper No. 41, V. 3 (1957). 2271. Proposed nomenclature for linear viscoelastic behavior, H. Leaderman. Trans.

Soc. Rheology I, 312 (1957). 2272. Proposed specification for plastic teeth, W. T. Sweeney, R. L. Myerson, E. E. Rose, and J. O. Semmelman. J. Prosthetic Dentistry

7, 420 (1957). 2273. Protective coating adhesion measurement

using an electronic averaging device for the adherometer, A. G. Roberts and R. S. Pizer. ASTM Bull. No. 221, 53 (1957). 2274. Pulse sky wave phenomena observed at 100 Kc, R. H. Doherty. Symp. on the Prop, of V. L. F. Radio Waves, Sponsored by the NBS

Boulder Laboratories and IRE Prof. Group on

Ant. and Prop. , January 23-25, 1957 (Boulder,

Colorado), Abstract, Paper No. 44, V. 3 (1957). 2275. Purification of mercury and its physical

properties, C. L. Gordon and E. Wichers. Ann.

N. Y. Acad. Sci. 65, No. 5, 369 (1957). 2276. Quantitative chromatographic procedure

for determining dextrose in sugar mixtures, E.

J. McDonald. Anal. Chem. 29, 32 (1957). 2277. Radiation exposure and the use of radioisotopes, L. S. Taylor. Impact of Sci. on Soc.

(Paris, France) 8, No. 4 (1957). 2278. Raman spectrum of triethylborane, E. J. Blau and B. W. Mulligan. J. Chem. Phys. 26, 1085 (1957). 2279. Range straggling of high-energy electrons

in carbon, J. E. Leiss, S. Penner, and C. S. Robinson. Phys. Rev. 107, 1544 (1957). 2280. Reaction of dimeric 5-aldo-l, 2-0-isopropylidene-D-xylo-pentofuranose with cyanide and the preparation of calcium 1, 2-0-isopropylidene-Lidofururonate-6-C14 dihydrate, R. Schaffer and

H. S. Isbell. J. Am. Chem. Soc. 79, 3867

(1957).

2281. Relation between roughness of interface and adherence of porcelain enamel to steel, J. C. Richmond, D. G. Moore, H. B. Kirkpatrick, and W. N. Harrison. Inst. Vitreous Enamellers

Ltd. Bull. (Published by J. Am. Ceramic Soc.

)

7, No. 5, 69 (1957). 2282. Unassigned.

2283. Reliability starts with circuit design, J. H. Muncy. Aviation Age 27, 1 (1957). 2284. Report of the subcommission on the question: "What are the most readily measured

characteristics of terrestrial radio noise from

which the interference to different types of prepared by W. Q. Crichlow. Proc. of the Xllth General Assembly, Intern. Sci. Radio

Union, Boulder, Colorado, 1957, XI, Pt. 4, 9 (1957). 2285. Representation of nonlinear functions of two input variables on analog equipment, D. A.

Elliott. Trans. Am. Soc. Mech. Engrs. 79, 489 (1957). 2286. Reproducibility of a pen-and- chart type of recording instrument under dynamic conditions,

D. H. Tsai and E. W. Hogue. ASME Paper 57A209 (1957). 2287. Results of Bureau of Standards 45-year

corrosion study, M. Romanoff. Petroleum

Engr. 29, No. 3 and 4, 615 (1957). 2288. Results of ionospheric drift measurements

in the United States, V. Agy. J. Atmospheric

and Terrest. Phys. Special Suppl. 1957, Proc.

of the Polar Atmosphere Symp., July 2-8, 195 6 (Oslo, Norway), Pt. II, 23 (1957). 2289. Results of laboratory tests of high duty and

super duty fireclay plastic refractories, R. A.

Heindl and W. L. Pendergast. Bull. Am. Ceram.

Soc. 36, No. 1, 6 (1957). 2290. Review of 1956 dental research: dental materials and instrumentation, G. C. Paffen- barger and J. W. Stanford. J. Am. Dental Assoc. 54, 465 (1957). 2291. Unassigned.

2292. Rotational lines of CH, OH, and CN in the solar spectrum, C. E. Moore and H. P. Broida.

7th Intern. Astrophys. Symp. Proc. Memoirs

Royal Sci. (Liege, Belgium) Series 4, 18, 252

(1957). 2293. Scientists' and public's responsibility, A.

V. Astin. Phys. Today 10, No. 11, 23 (1957). 2294. Second report of the special committee on world-wide ionospheric soundings of the URSI/ AGI Committee, May 1957, A. H. Shapley, Chairman, Boulder, Colorado, National Bureau of Standards, Central Radio Propagation Laboratory (1957). 2295. Secondary chromatic aberration, R. E. Stephens. J. Opt. Soc. Am. 47, No. 12, 1135 (1957). 2296. Sedimentation equilibrium of flexible chain molecules, L. Mandelkern, L. C. Williams, and S. G. Weissberg. J. Phys. Chem. 61, 271

(1957). 2297. Sharp line absorption in silica near 3400 cm'1

, A. M. Bass and H. P. Broida. J. Opt. Soc. Am. 47, 163 (1957). 2298. Shellac, C. C. Hartman. Offic. Dig. Federation Paint Varnish Production Clubs 29, No. 393, 1028(1957).

135
2299. Silicate cements: How to select and use

them, G. C. Paffenbarger. Trans. Am. Dental

Soc. of Europe (John Wright and Sons Ltd. , Bristol, England) (1957). 2300. Simple technique for diplexing 10, 000 Mc

and video signals on coaxial cables. M. C. Thomspon, Jr., and D. M. Waters, Rev. Sci. Instr. 28, 206 (1957). 2301. Sing-around ultrasonic velocimeter for

liquids, M. Greenspan and C. E. Tschiegg. Rev. Sci. Instr. 28, No. 11, 897 (1957). 2302. Some examples of the use of high-speed computers in statistics, J. M. Cameron. Proc.

Conf. Designs of Experiments in Army Research, Development, and Testing, Off. Ord. Research

Rept. 57-1, 129 (1957). 2303. Some extreme value results for indefinite Hermitian matrices, M. Marcus, B. N. Moyles, and R. Westwick. Illinois J. Math. 1, 449 (1957). 2304. Some implications of slant-Es, E. K. Smith and R. Knecht. J. Atmospheric and Terrest

Terrest. Phys. Spec. Suppl. 1957, Proc. Polar Atmospheric Symp. July 1956 (Oslo, Norway)

Pt. II, 195 (1957). 2305. Some theorems about pr (n), M. Newman.

Can. J. Math. 9, 68 (1957). 2306. Specific heats of liquid metals and liquid

salts, T. B. Douglas. Trans. Am. Soc. Testing Materials 79, 23 (1957). 2307. Spectra of afterglows and discharges from

nitrogen- oxygen mixtures, U. H. Kurzweg, A. M. Bass, and H. P. Broida. J. Mol. Spectro- scopy 1, 184 (1957). 2308. Spectrophotometry and aerial photo- reconnaissance, H. J. Keegan and J. C. Schleter. Abstract J. Opt. Soc. Am. 47, 1050 (1957). 2309. Spectroscopic studies of solids condensed

at 4. 2°K from electric discharge through nitrogen, oxygen, hydrogen, water, and ammonia, H. P. Broida. Proc. Conf. on Chem. Aeronomy. The

Threshold of Space (Pergamon Press, London,

England) (1957). 2310. Spectroscopic study of electronic flame temperatures and energy distributions, H. P. Broida and K. E. Shuler. J. Chem. Phys. 27, No. 4, 933 (1957).

2311. Spectroscopic survey of energy distributions

of OH, C2 and CH radicals in low-pressure

acetylene -oxygen flames, H. P. Broida and D.

F. Heath. J. Chem. Phys. 26, 223 (1957). 2312. Spectrum analysis of sferics, W. L. Taylor. Symp. on the Prop, of V. L. F. Radio Waves,

Sponsored by the NBS Boulder Laboratories and

the IRE Prof. Group on Ant. and Prop. , January

23-25, 1957 (Boulder, Colorado), Paper No. 33, V. 3 (1957). 2313. Spectrum of the C3 molecule between

3600 A and 4200 A, N. H. Kiess and H. P. Broida. Mem. Soc. Roy. Sci. (Liege, Belgium)

18, 544 (1957). 2314. Sphere-gap volt-time curves —standards

for steep front surge measurements, J. H. Park

and H. N. Cones. Am. Inst. Elec. Engrs. Conf. Paper No. CP57-215 (1957). 2315. Stability of quartz resonators at very low

temperatures, F. P. Phelps. Proc. 11th Ann. Symp. on Frequency Control, May 7-9, 1957

(Ft. Monmouth, N. J. ) p. 256 (1957). 2316. Stabilization of free radicals at low temperatures, H. P. Broida. Annal N. Y. Acad. Sci.

67, Article 9, 530 (1957).

2317. Statistical results and their shortcomings

concerning the ionosphere within the auroral

zone, R. W. Knecht. J. Atmospheric and

Terrest. Phys. Special Suppl. 1957, Proc. of the Polar Atmosphere Symp. July 2-8, 1956

(Oslo, Norway) Pt. II, 109 (1957). 2318. Strength and fatigue of glass at very low

temperatures, R. H. Kropschot and R. P. Mikesell. J. Appl. Phys. 28, 610 (1957). 2319. Structural analysis of clinical dextrans by

periodate oxidation and isotope dilution techniques,

J. D. Moyer and H. S. Isbell. Anal. Chem. 29, 1862 (1957). 2320. Structural interpretation of immiscibility

in oxide systems: 1. Analysis and calculation of immiscibility, E. M. Levin and S. Block, J. Am.

Ceram. Soc. 40, No. 3, 95 (1957). 2320A. Structural interpretation of immiscibility

in oxide systems: 2. Coordination principles applied to immiscibility, M. Levin and S. Block.

, J. Am. Ceram. Soc. 40, No. 4, 113 (1957). 2321. Structure of 5-aldo-l, 2-0-isopropylidene- D-xylo-pentofuranose, R. Schaffer and H. S. Isbell. J. Am. Chem. Soc. 79, 3864 (1957). 2322. Structure of the methylamine molecule,

I. Microwave spectrum of CD3 ND2, D. R. Lide,

Jr. J. Chem. Phys. 27, 343 (1957). 2323. Structure of the methylamine molecule.

II. Theory of internal motions and application to CD3NO2, D. Kivelson and D. R. Lide, Jr. J. Chem. Phys. 27, 353 (1957). 2324. Studies in nonequilibrium rate processes.

I. The relaxation of a system of harmonic

oscillators, E. W. Montroll and K. E. Shuler.

J. Chem. Phys. 26, 454 (1957). 2325. Studies in nonequilibrium rate processes.

II. The relaxation vibrational nonequilibrium in distributions in chemical reactions and shock

waves, K. E. Shuler. J. Phys. Chem. 61, 849

(1957). 2326. Studies of transequatorial ionospheric propagation by the scatter- sound method, by

Villard- Stein- Yeh. Comments by R. Silberstein.

J. Geophys. Research 62, 645 (1957). 2327. Studies on electroless nickel plating, C. H. de Minjer and A. Brenner. Plating 44, 1297

(1957) 2328. Study of accuracy in chemical analysis using linear calibration curves, J. Mandel and

F. J. Linnig. Anal. Chem. 29, 743 (1957). 2329. Superconductivity of microscopic tin filaments, O. S. Lutes. Phys. Rev. 105, No. 5, 1451 (1957). 2330. Suppression of bubbling in boiling refrigerants, G. J. Minkoff, F. I. Scherber, and A. K.

Stober. Nature 180, 1413 (1957). 2331. Sur l'utilisation des observations meterorologiques courantes en propagation radioelectrique, B. R. Bean. L'Onde Electrique

(Paris, France) 37, No. 362, 411 (1957). 2332. Survey of computer development and

applications, S. N. Alexander. Proc. Conf. on Sci. and Tech. for the Deans of Engineering. Purdue Univ. (Lafayette, Indiana) (1957). 2333. Survey of hazards of handling liquid oxygen,

C. S. McCamy. Ind. Eng. Chem. 49, 81A (1957). 2334. Symbolic designations for electrical connections, A. Weinberger and H. Loberman. J. Assoc. Computing Machinery 4, No. 4, 420 (1957). 2335. Systems of inequalities involving convex

functions, K. Fan, I. Glicksburg, and A. J. Hoffman. Proc. Am. Math. Soc. 8, 617 (1957).

136
2336. Tables 4f-l through 4f-6 on thermal ex- pansion. P. Hidnert and H. S. Krider. Am.

Inst. Phys. Handbook (McGraw-Hill Pub. Co.

Inc., New York, N. Y. ) (1957). 2337. Tables of spectra, C. E. Moore. Trans.

Intern. Astron. Union 9, 212 (1957). 2337A. Tacan coverage and channel requirements, M. T. Decker. IRE Trans. Aeronaut. Navigational Electronics ANE-4, No. 3, 135 (1957). 2338. Technique for monitoring triatiated- water vapor in air, C. A. Ziegler and A. Schwebel.

Nucleonics 15, No. 1, 64 (1957). 2339. Techniques for electroforming of precision waveguide components in the millimeter wavelengths, A. A. Feldmann. Rev. Sci. Instr. 28, 295 (1957). 2340. Temperature dependence of distribution functions in quantum statistical mechanics, I. Oppenheim and J. Ross. Phys . Rev. 107, No. 1, 28 (1957). 2341. Tension testing of plastics, F. W. Reinhart. Am. Soc. Testing Materials Symp. on

Testing of Nonmetallic Materials No. 194 (1957). 2342. The analysis of convariance for incomplete

block design, M. Zelen. Biometrics 13, No. 3, 309 (1957). 2343. The analysis of incomplete block designs, M. Zelen. J. Am. Stat. Assoc. 52, 204 (1957). 2344. The attenuation of Rayleigh waves with depth in a medium with two surface layers, R. Stoneley and U. Hochstrasser. Monthly Notices

of Royal Astron. Soc. Geophys. (London, England Supplement 7, 279 (195 7). 2345. The attenuation versus frequency characteristics of VLF radio waves, J. R. Wait.. Proc. IRE 45, 768 (1957). 2346. The aurora in middle and low latitudes,

S. Chapman. Nature (Mac Millan and Co. , London, England) 179, No. 4549, 7 (1957). 2347. The clamp-type alternating-current micro- ammeter, G. F. Montgomery and C. Stansbury. Am. Inst. Elec. Engrs. Paper No. 57114 (1957). 2348. The condenser microphone as a displace- ment detector calibrator, W. Koidan. J. Acoust.

Soc. Am. 29, No. 7, 813 (1957). 2349. The effect of heat treatment of the susceptibility of sand cast aluminum alloy 220 to stress corrosion cracking, F. M. Reinhart. Corrosion 13, 17 (1957). 2350. The effect of prism on the location of the principal point, F. E. Washer. Photogrammetric

Eng. 23, No. 13, 520 (1957). 2351. The effect of receiver bandwidth on amplitude distribution of VLF atmospheric noise, F. F.

Fulton. Symp. on the Prop, of V. L. F. . Radio Waves, Sponsored by the NBS Boulder Laboratories and IRE Prof. Group on Ant. and Prop. , January 23-25, 1957 (Boulder, Colorado), Paper

No. 37, V. 3 (1957). 2352. The effective electrical constants of soil

at low frequencies, J. R. Wait. Proc. IRE 45,

1411 (1957). 2353. The effects of fungicides on deterioration

of leather, S. Dahl. J. Am. Leather Chemists

Assoc. 52, 611 (1957). 2354. The effects of rates of straining on some

tensile properties of polyester film, C. F. Bersch, F. L. McCrackin, and K. F. Plitt. Modern Plastics 35, 171 (1957).

2355. The electronic structure and magnetic

properties of uranyl-like ions, II. Plytonyl,

J. C. Eisenstein and M. H. L. Pryce. Proc.

Roy. Soc. (London, England) 238, 31 (1957). 2356. The emission spectrum of OH from 2. 8

to 4.1/i, H. C. Allen, Jr., E. K. Plyler, and

L. R. Blaine. Spectrochem. Acta 9, 126 (1957). 2357. The flash photolysis of chlorine monoxide,

S. H. C. Edgecombe, R. G. W. Norrish, and

B. A. Thrush. Proc. Roy. Soc. (London, England) 243, 24 (1957). 2358. The galvanic corrosion theory for adherence

of porcelain enamel ground coats to steel, D. G. Moore, J. W. Pitts, J. C. Richmond, and W. N. Harrison. Inst. Vitreous Enamellers Ltd. Bull. (Published by J. Am. Ceram. Soc.) 7, No. 4 (1957). 2359. The gassing of dry cells, E. M. Otto and W. G. Eicke, Jr. J. Electrochem. Soc. 104, 199 (1957). 2360. The geometrical optics of VLF sky wave

propagation, J. R. Wait and A. Murphy. Symp.

on the Prop, of V. L. F. Radio Waves, Sponsored by the NBS Boulder Laboratories and IRE Prof. Group on Ant. and Prop. , January 23-25, 1957 (Boulder, Colorado), Paper No. 5, V. 1; Proc. IRE 45, 754 (1957). 2361. The Government's bookstore, L. T. Milliken. Capital Chemist 7, No. 1, 10 (1957). 2362. The heat capacity of aluminum oxide in the range 300° to 700° K, E. D. West and D. C. Ginnings. J. Phys. Chem. 61, 1573 (1957). 2363. The impact absorbing capacity of textile yarns, J. C. Smith, F. L. McCrackin, and H. F. Schiefer. ASTM Bull. No. 220, 52 (1957). 2364. The impedance of a wire grid parallel to a

dielectric interface, J. R. Wait. IRE Trans,

on Microwave Theory and Tech. MTT-5, 99

(1957). 2365. Unassigned.

2366. The International Commission on Radiological units and measurements, L. S. Taylor.

International Associations (Pergamon Press, London, England) 9, 594 (1957). 2367. The ionic character and elastic moduli of zinc blend lattices, R. F. Potter. Phys. Chem.

of Solids 3, 223 (1957). 2368. The ionic dissociation of 2, 4-, 2, 6-, 3, 4-dichlorobenzoic acids in water, M. M. Davis and H. B. Hetzer. J. Phys. Chem. 61, 123

(1957). 2369. The ionic dissociation of 2, 6-dimethyl- benzoic acid in water, M. M. Davis and H. B. Hetzer. J. Phys. Chem. 61, 125 (1957). 2370. The isotropic length of polymer networks,

D. E. Roberts, L. Mandelkern, and P. J. Flory. J. Am. Chem. Soc. 79, 1515 (1957). 2371. The long distance horizontal radiation pattern of a high-frequency antenna, R. Silverstein. IRE Trans, on Ant. Prop. AP-5, 397,

(1957). 2372. The microwave spectrum and structure

of sulfurylfluoride, D. R. Lide, Jr. , D. E. Mann, and R. M. Fristrom. J. Chem. Phys.

25, 734 (1957). 2373. The mode theory of V. L. F. ionospheric propagation for finite ground conductivity, J. R. Wait. Symp. on Prop, of V. L. F. Radio Waves,

Sponsored by the NBS Boulder Laboratories and IRE Prof. Group on Ant. and Prop. , January

23-25, 1957 (Boulder, Colorado), Paper No. 6, V. 1; Proc. IRE 45, 760 (1957).

137
2374. The new safety code for portable metal

ladders, R. L. Lloyd. Mag. of Standards 28, No. 4, 104 (1957). 2375. The number of representations of a quadratic form as a sum of four squares, G. Pall and

O. Taussky. Proc. Roy. Irish Acad. Sect. A, No. 3, 23 (1957). 2376. The philosophy underlying radiation protection, L. S. Taylor. Am. J. Roentgenol.

2377. The precise measurement of the infrared spectra of molecules of the atmosphere, E. K. Plyler and E. D. Tidwell. Memoires Royal Sci. Soc. Liege, quatrieme serie, Inst. Astrophys.

(Liege, Belgium) 28, 426 (1957). 2378. The principle of randomization in the design

of experiments, C. Eisenhart. Proc. Conf. on Design of Experiments, Off. Ord. Research

Report 57-1, 15-16 (1957). 2379. The probability of a saddle point, A. J. Goldman. Am. Math. Monthly (Math. Notes) 64, 729 (1957). 2380. The role of electronic computers in air

traffic control, R. D. Elbourn. IRE Conv. Record 5, Pt. 8, 114 (1957). 2381. The spectrum of the electron density

fluctuations in the ionosphere, R. M. Gallet.

J. Atmospheric and Terrest. Phys. Special

Suppl. 1957, Proc. of the Polar Atmosphere

Symp. , July 2-8, 1956 (Oslo, Norway) Pt. II, 165 (1957). 2382. The strontium oxide content of portland cements, L. Bean. ASTM Bull. No. 224, 42

(1957). 2383. The structure of bone mineral, A. S. Posner. Clinical Orthopedics No. 9, p. 5 (1957). 2384. The tensile properties of selected steels as a function of temperature, E. P. Klier. Welding Research Council Bull. 35 (1957). 2385. The torsion of a hollow square, J. L. Synge and W. F. Cahill. Quart. Appl. Math. 15, No. 3, 217 (1957). 2386. The transient behavior of the electro- magnetic ground wave on a spherical earth, J. R. Wait. IRE Trans. Ant. Prop. AP-5, No. 2, 198 (1957). 2387. The transmission of Rayleigh waves across an ocean floor with two surface layers, R. Stoneley. Bull. Seismological Soc. Am. 47, 7 (1957). 2388. The use of surface weather observation to predict the total atmospheric bending of radio rays at small elevation angles, B. R. Bean and

U. A. Cahoon. Proc. IRE 45, 1545 (1957). 2389. The utility of meteor burst for intermittent radio communication, G. F. Montgomery and G.

R. Sugar. Proc. IRE 45, No. 12, 1684 (1957). 2390. The waveguide mode theory of VLF iono- spheric propagation, J. R. Wait and H. H. Howe.

Proc. IRE 45, 95 (1957). 2391. The "wave- guide "mode" theory of the propagation, K. G. Budden. Symp. on the Prop, of V. L. F. Radio Waves, Sponsored by the NBS

Boulder Laboratories and IRE Prof. Group on

Ant. and Prop. January 23-25, 1957 (Boulder, Colorado), Appendix B, V. 4, 50; Proc. IRE

45, 772 (1957); Comments V. 4, 96 (1957). 2392. Theory of the forbidden transition of nitrogen atoms trapped in solids, C. M. Herzfeld. Phys. Rev. 107, 1239 (1957).

2393. Thermal conductivities of copper and

copper alloys, R. L. Powell, W. M. Rogers, and H. M. Roder. Proc. 1956 Cryogenic

Engineering Conference, Paper E-3, p. 166. Edited by K. D. Timmerhaus, Chemical

Engineering Dept. , University of Colorado

(Boulder, Colorado) (1957). 2394. Thermodynamic properties at high temperatures: Ideal gas thermal functions to 25, 000

deg. K for diatomic molecules, oxygen, nitrogen,

nitricocide, and their molecule ions, C. W.

Beckett and L. Haar. Proc. Conf. on Thermodynamic and Transport Properties of Fluids, July 10-12, 1957 (London, England) p. 27 (1957). 2395. Tough problems solved with tricky tooling, F. P. Brown and C. E. Pelander. Machinery 64, No. 1, 149 (1957). 2396. Transistor beta tester, G. F. Montgomery.

Electronics 30, No. 5, 198 (1957). 2397. Transmission of air-borne noise through

walls and floors, R. K. Cook and P. Chrzanowski. Handbook of Noise Control (McGraw-Hill Book

Co. Inc. , New York, N. Y. ) Chapter 20 (1957). 2398. Transmission of ultrasonic vibrations in metals, R. W. Mebs and D. B. Ballard. Wright- Air Devel. Ctr. Tech. Rept. 56-457 (1957). 2399. Two resistance-type hot-pressing furnaces

for laboratory use, R. F. Walker. Rev. Sci. Instr. 28, No. 7, 563 (1957). 2400. Uniqueness theory for asymptotic expansions in general 1 regions, P. Davis. Pacific J. Math. 7, 849 (1957). 2401. Unit- cell data of the lead niobate PbNb206

, R. S. Roth. Acta Cryst. 10, Pt. 6, 437 (1957). 2402. U. S. A. National Committee report, URSI

subcommission 6. 3, antennas and waveguides, and annotated bibliography, H. V. Cottony, R.

S. Elliott, E. C. Jordan, V. H. Rumsey, K. M.

Siegel, J. R. Wait, and O. C. Woodyard. Proc.

12th Gen. Assembly, Intern. Sci. Radio Union, August-September 1957 (Boulder,

Colorado)ll, Pt. 6, 121 (1957). 2403. Use of carbon-14 and tritium for the study and characterization of cellulose and other poly- saccharides, H. S. Isbell, H. L. Frush, and J. D. Moyer. Tappi 40, No. 9, 739 (1957). 2404. Use of computers in statistics, J. M. Cameron. Proc. 4th Annual High-Speed Computer Conf. (Louisiana State University, Baton

Rouge, La. ) p. 67 (1957). 2405. Utilizzazione delle osservazioni meteoro- , logiche correnti nella propagation radio- electrica, B. R. Bean. Post e telecomun. 25, 1120 (1957). 2406. Vacuum-insulated transfer tube, R. B. Jacobs and R. J. Richards. Rev. Sci. Instr. 28, 291 (1957). 2407. Variation of elastic constants and static strains with hydrostatic pressure: a method for calculation from ultrasonic measurements, R. K. Cook. J. Acoust. Soc. Am. 29, 445 (1957). 2408. Very low temperature data: Properties of paramagnetic salts, R. P. Hudson. Chapter 4-b, Am. Inst. Phys. Handbook (McGraw-Hill Pub.

Co. Inc., New York, N. Y. ) p. 14 (1957). 2409. Vibrational spectrum and force constants of diboron tetrachloride, D. E. Mann and L. Fano.

J. Chem. Phys. 26, 1665 (1957). 2410. Vibrational structure in the ionization

efficiency curves of hydrogen and deuterium

molecules, M. Krauss and A. Kropf. J. Chem.

Phys. 26, 1776 (1957).

138
2411. Vibration- rotation bands of ammonia

II —the molecular dimensions and harmonic

frequencies of ammonia and deuterated ammi

W. S. Benedict and E. K. Plyler. Can. J. Phys. 35, 1235 (1957).

2412. Visual auroral observations, S. Chapman

(with D. S. Kimball, J. Paton, O. Schneider, and

I. L. Thomsen). Annals. Intern. Geophys. Year

4, Pt. 1, 41 (1957). 2413. Water-soluble degradation products of asphalt, A. Schriescheim and S. H. Greenfeld. ASTM Bull. 220, 43 (1957).

569918 0—61 10 139
2414. A-C zero locator, L. Costrell. Electronics 31, 98 (1958). 2415. A compact microwave refractometer for use in small aircraft, M. C. Thompson, Jr. , and M. J. Vetter. Rev. Sci. Instr. 29, No.

12, 1093 (1958). 2416. A comparison of insulating materials.

J. E. Schrodt, M. M. Fulk, W. A. Reynolds, and W. S. Flanery. Proc. 1957 Cryogenic

Engineering Conference, Abstract, Paper G-7,

p. 416. Edited by K. D. Timmerhaus. Chemical Engineering Department, University of Colorado (Boulder, Colorado) (1958). 2417. A delegate reports on small tools, F. P. Brown. Mag. of Standards 29, No. 8, 235

(1958). 2418. A dispersion function of paramagnetic

relaxation, P. H. Fang. Physica (Amsterdam,

Holland) 24, 970 (1958). 2419. A dry, static calorimeter for rf power

measurement, P. A. Hudson and C. M. Allred. IRE Trans. Instrumentation 1-7, No. 3-4, 292

(1958). 2420. A facility for the evaluation of resistance

strain gages at elevated temperatures, R. L. Bloss. Am. Soc. Testing Materials Spec. Tech. Publ. No. 230, 57 (1958). 2421. A feedback amplifier with negative output resistance for magnetic measurements, W. P. Harris and I. L. Cooter. IRE Natl. Conv. Record, Pt. 5, p. 217 (1958). 2422. A free precession determination of the proton gyromagnetic ratio, P. L. Bender and

R. L. Driscoll. IRE Trans. Instrumentation

1-7, No. 3-4, 176 (1958). 2423. A long-distance pulse-propagation experi- ment on 20. 1 megacycles, R. Silberstein. J. Geophys. Research 63, No. 3, 445 (1958). 2424. A magnetic specimen mount for fracto- graphy, D. B. Ballard and J. A. Bennett. Metal Prog. 74, No. 5, 114 (1958). 2425. A method for measuring the directivity of directional couplers, G. E. Schafer and R. W.

Beatty. IRE Trans. Microwave Theory and

Tech. MTT-6, No. 4, 419 (1958). 2426. A method of controlled slack quenching of impact bars, M. R. Meyerson and S. J. Rosenberg. Rev. de Metallurgie 55, No. 4, 317 (1958). 2427. A method of speeding up iterations with superlinear convergence, A. M. Ostrowski.

J. Math. Mech. 7, 117 (1958). 2428. A modulator for microwave mixers,^. E. Schafer. IRE Trans. Microwave Theory and

Tech. MTT-6, No. 3, 333 (1958). 2429. A note on confidence intervals in regression problems, J. Mandel. Annals Math. Stat. 49, No. 3, 903 (1958). 2430. A novel rocket hoist, J. A. Dickinson. Elevator World 6, No. 2, 13 (1958). 2431. A phenomenological theory of induced

electrical polarization, J. R. Wait. Can. J. Phys. 36, 1634 (1958). 2432. A pretied tie for communication line wires,

C. R. Ballard and R. R. Bouche. Conf. Paper

No. CP 58-266 presented at the Annual Meeting

of Am. Inst. Elec. Engrs. (1958). 2433. A property of additively closed families of distributions, E. L. Crow. Annals Math. Stat. 29, No. 3, 892 (1958).

2434. A proposed standard for facilities for

scientific conferences, A. T. McPherson. Mag.

of Standards 29, No. 7, 202 (1958). 2435. A recording torsion testing machine for wire, H. C. Burnett. ASTM Bull. No. 227

(1958). 2436. A review of the state of the art and future trends in electrochemical battery system. I. The more common systems, W. J. Hamer. Proc. Seminar on Advanced Energy Sources and Conversion Techniques, ASTIA, No. AD209301,

p. 41; Dept. Comm. OTS No. PB151461.

2437. A study of earth currents near a VLF

monopole antenna with a radial wire ground

system, J. R. Wait. Proc. IRE 46, No. 8, 1 (1958). 2438. A study of VLF field strength data^both

old and new, J. R. Wait. Geofisica Pura e Applicata (Milano, Italy) 41, 73 (1958). 2439. A survey of Lyapunov's second method, H. A. Antosiewicz. "Contributions to the theory

of nonlinear oscillations, " Vol. IV, ed. by S. Lefshetz, p. 141 (Annals of Mathematics Studies No. 141 (Princeton University Press, Princeton, New Jersey) (1958). 2440. A survey of some recent advances in poly- mer physics, and their relation to dielectric properties, A. J. Curtis. Insulation p. 15 (1958). 2441. A system of names for binary numbers,

J. Stern. Science 128, 594 (1958). 2442. A toric bending specimen for investigation

of geometrical factors in fatigue, J. A. Bennett

J. G. Weinberg. ASTM Bull. No. 234, p. 53

(1958). 2443. A unique thermal conductivity gas analyzer, J. R. Purcell, J. W. Draper, and D. H. Weitzel. Proc. 1957 Cryogenic Engineering

Conference, Paper D- 4, p. 191. Edited by K.

D. Timmerhaus. Chemical Engineering Department, University of Colorado (Boulder, Colorado)

(1958). 2444. Absolute measurement of W . for polon- ium-210 alpha particles, Z. Bay ancfH. H.

Seliger. Radiation Research 9, No. 1, 90 (1958). 2445. Absorption spectra of solids condensed at low temperatures from electric discharges, A. M. Bass and H. P. Broida. J. Mol. Spectro- scopy 2, 42 (1958). 2446. AC-DC transfer instruments for current and voltage measurements, F. L. Hermach. IRE

Trans. Instrumentation 1-7, No. 3-4, 235 (1958). 2447. Accelerating convergence of iterative processes, J. H. Wegstein. Communications,

Assoc. Computing Machinery 1, No. 6, (1958). 2448. Accuracy, F. W. Reinhart. Juniata College Bull. 55, No. 4, 2 (1958). 2449. Acrylic resins in prosthetic dentistry, W. T. Sweeney. Dental Clin, of North America

593 (1958). 2450. Age to indium resonance for D-D neutrons

in water, V. Spiegel, Jr., D. W. Oliver, and

R. S. Caswell. Nuclear Sci. and Eng. 4, No. 4, 546 (1958). 2451. American Dental Association specifications

for dental materials (third ed. ), G. C. Paffen- barger, J. W. Stanford, and W. T. Sweeney

(1958).

140
2452. Amplitude stabilization of a microwave

signal source, G. F. Engen. IRE Trans. Micro- wave Theory and Tech. MTT-6, No. 2, 202

(1958). 2453. An analog-digital simulation for the design and improvement of man-machine systems,

H. K. Skramstad, A. A. Ernst and J. P. Nigro. 1957 Eastern Joint Computer Conf. Proc. (Inst. Radio Engrs., New York, N. Y.)(1958).

2454. An analysis of dielectric loss in two urea

addition compounds, J. I. Lauritzen, Jr. J. Chem. Phys. 28, No. 1, 118 (1958). 2455. An equation for calculating the number of chain scissions in the photochemical degradation

of solid polymers, J. H. Flynn. J. Polymer

Sci. 27, 83 (1958). 245 6. An extension to the mode theory of VLF

ionospheric propagation, J. R. Wait. J. Geophys. Research 63, No. 1, 125 (1958). 2457. An impact test for leather based on an

alternating punching force, T. J. Carter. J. Am. Leather Chemists Assoc. 53, 250 (1958). 2458. An investigation of the perturbations impassed upon radio waves penetrating the iono- sphere, R. S. Lawrence. Proc. IRE 46, 1 (1958). 2459. Unassigned.

2460. Analysis of photocross sections, A. S. Penfold and J. E. Leiss. Physics Dept. Rept. (University of Illinois, Champaign, 111. ) (1958). 2461. Angular distribution in neutral meson

decay, J. E. Leiss and R. A. Schrack. Phys.

Rev. 109, 1326 (1958). 2462. Atmospheric research, D. M. Gates. Americana Annual, p. 62 (1958). 2463. Atomic and molecular negative ions in stellar atmospheres, L. M. Branscomb, and

B. E. F. Pagel. Monthly Notices Roy. Astron.

Soc. 118, No. 3, 258 (1958). 2464. Atomic beam sources and standard of length, K. G. Kessler, R. L. Barger, and W. G. Schweitzer, Jr. IRE Trans. Instru- mentation 1-7, No. 3-4, 181 (1958). 2465. Autographic stress- strain recorders,

R. R. Bouche and D. R. Tate. ASTM Bull. No. 228, 33 (1958). 2466. Automatic coding principles, J. H. Wegstein. Proc. Symp. on Advanced Programming Methods for Digital Computers, Washington, D. C. , June 1956 (Office of Naval Research, Department of the Navy, Washington, D. C. ), p. 3 (1958). 2467. Automation and future management infor- mation systems, S. N. Alexander. Proc. 4th Military- Industry Packaging and Handling Symp., Navy Department, September 30-October 2, 1958, p. 23, (Washington, D. C. ) (1958). 2468. Automation in the laboratory, B. F. Scribner. Capital Chemist 8, 38 (1958). 2469. Basic research in Europe, D. M. Gates. Science 128, No. 3318, 227 (1958). 2470. Basic standardization, S. F. Booth. Report of the 1st Annual Standardization Symp. Army Chem. Corps Engr. Command, March

24-25, 1958 (Army Chem. Center, Maryland)

p. 90 (1958). 2471. Behavior of young children under conditions simulating entrapment in refrigerators, K. Bain, M. L. Faegre, and R. S. Wyly. Pediatrics

22, No. 4, Pt. I, 628 (1958).

2472. Beta-alumina-type structure in the system

lanthana-alumina, R. S. Roth and S. Hasko. J. Am. Ceram. Soc. 41, No. 4, 146 (1958). 2473. Beta-gamma correlations from polarized manganese-52 , E. Ambler, R. W. Hayward,

D. D. Hoppes, and R. P. Hudson. Phys. Rev.

110, No. 3, 787 (1958); Proc. Intern. Congr. on Nuclear Phys. (Paris, France, July 1958) and

Proc. Kamerlingh Onnes Conf. on Low Temp.

Phys., Leiden, The Netherlands, Supplement of Physica (June 1958). 2474. Bonding agents for high- temperature

strain gages, D. G. Moore. Am. Soc. Testing

Materials, Spec. Tech. Publ. No. 230, 106

(1958). 2475. Bose-Einstein condensation and the lambda

transition in liquid helium, M. S. Green. Phys.

Rev. Letters 1, 409 (1958). 2476. Branched- chain higher sugars, R. Schaffer and H. S. Isbell. J. Am. Chem. Soc. 80, 756 (1958). 2477. Bremsstrahlung cross- section measure- ment for 50-kev electrons, J. W. Motz and R. C. Placious. Phys. Rev. 109, 235 (1958). 2478. Brief history of the National Committee on

Radiation Protection and Measurements, L. S. Taylor. Health Phys. J. 1, 3 (1958). 2479. Bright rims in diffuse nebulae, S. R. Pottasch. Rev. Mod. Phys. 30, No. 3, 1053

(1958). 2480. Broad and narrow beam attenuation of

j r 192

gamlri a rays in concrete, steel, and lead, V. H. Ritz. Nondestructive Testing 16, No.

3, 269 (1958). 2481. Calculated calibration points for negative

ion appearance potentials , L. M. Branscomb.

J. Chem. Phys. 29, No. 2, 452 (1958). 2482. Calculation of gaseous heat conduction in dewars, R. J. Corrruccini. Proc. 1957 Cryogenic Engineering Conference, Paper G- 1 , p. 353. Edited by K. D. Timmerhaus. Chemical

Engineering Dept. , University of Colorado

(Boulder, Colorado) (1958). 2483. Calibration of thermocouples at low temperatures, M. D. Bunch and R. L. Powell. Proc. 1957 Cryogenic Engineering Conference, Paper E- 6, p. 269. Edited by K. D. Timmerhaus. Chemical Engineering Dept. , University

of Colorado (Boulder, Colorado) (1958). 2484. Career opportunities in the Government, W. R. Brode and G. E. Hilbert. Chem. Eng. News 36, Pt. II, 70 (1958). 2485. Charge- storage pulse-height analyzers

for use with pulsed accelerators , L. Costrell and R. E. Brueckmann. Nuclear Instr. (North- Holland Publishing Co., Amsterdam, Holland)

3, 350 (1958). 2486. Chemiluminescence in the system atomic sodium plus atomic hydrogen, J. D. McKinley,

Jr. , and J. C. Polanyi. Can. J. Chem. 36, 107 (1958). 2486A. Classification and nomenclature for standards of measurement, A. G. McNish. IRE Trans. Instrumentation 1-7, No. 3-4, 371

(1958). 2487. Colorimetry from precision spectro- photometry, H. J. Keegan. J. Opt. Soc. Am.

48, 281 (1958).

141
2488. Collection of ions produced by alpha particles in air, Z. Bay and H. H. Seliger. Bull. Am. Phys. Soc. II, 3, No. 3, Session Y-9 (1958). 2489. Comments on capacities of plumbing

drains, R. S. Wyly. Yearbook of the Am. Soc.

Sanit. Engr. 36, 243 (1958). 2490. Commission III on ionospheric radio, world-wide soundings committee: Status report by A. H. Shapley, Chairman, Intern. Sci. Radio Union (U. R.S.I. ) Info. Bull. No. 108, 13 (1958). 2491. Communication via meteor bursts, G. F. Montgomery. Radio- Electronics 29, 88 (1958). 2492. Comparison of first, second, and third approximations in Bacher and Goudsmit's

theory of atomic spectra, R. E. Trees. J. Opt. Soc. Am. 48, 293 (1958). 2493. Comparison of phase difference and Doppler shift measurements for studying ionospheric

fine structure using earth satellites, M. C. Thompson, Jr., and D. M. Walters. Letter Proc. IRE 46, No. 12, 1960 (1958). 2494. Complementary use of nuclear magnetic

resonance and infrared absorption studies in organic phosphorus chemistry, H. Finegold. Ann. N. Y. Acad. Sci. 70, 875 (1958). 2495. Compound semiconductors, H. P. R. Erederikse. J. Metals 10, 346 (1958). 2496. "Computers, " F. L. Alt. An item in The

Encyclopedia of Chemistry Supplement, p. 91 (Reinhold Publishing Corp. , New York, N. Y. ) (1958). 249 6A. Conditions at the ionization and shock

fronts in collisions of gas clouds--Bright rims

in diffuse nebulae, Part VI, S. R. Pottasch. Rev. Modern Phys. 30, No. 3, 1053 (1958). 2497. Conference on photonuclear reactions,

J. E. Leiss. Phys. Today 1 1 , No. 9, 18

(1958). 2498. Congruences for the coefficients of modular forms and for the coefficients of j (T), M. Newman. Proc. Am. Math. Soc. 9, 609 (1958). 2499. Continuous phase difference measurements

of earth satellites, J. W. Herbstreit and M. C. Thompson, Jr. Proc. IRE 46, No. 8, 1535

(1958). 2500. Contributions to Handbook of Physics,

Edited by E. U. Condon and H. Odishaw (McGrawHill Book Co. , Inc., New York, N. Y. ) ( 1958): Arithmetic, F. L. Alt, Chapter 1, Pt. 1, p. 1-4. Color vision and colorimetry, D. B. Judd, Chapter 4, Pt. 6, p. 6-64. Control mechanisms, H. K. Skramstad and G.

L. Landsman, Chapter 9, Pt. 2, p. 2-69.

Electrolytic conductivity and electrode processes, W. J. Hamer and R. E. Wood, Chapter 9, Pt.

4, p. 4-138. Electronic circuits, C. H. Page, Chapter 4, Pt.

4, p. 4-47. Elements of probability, C. Eisenhart and M.

Zelen, Chapter 12, Pt. 1, p. 1-134. Geometry, A. J. Hoffman, Chapter 8, Pt. 1, p. 1-97.

Integral equations, M. Abramowitz, Chapter 6, Pt. 1, p. 1-90. Neutron physics, C. O. Muehlhause, Chapter

7, Pt. 9, p. 9-125. Nuclear electromagnetic radiations, R. W. Hayward, Chapter 6, Pt. 9, p. 9-106.

Statistical design of experiments, W. J. Youden, Chapter 13, Pt. 1, p. 1-165. Thermometry and pyrometry, R. E. Wilson and

R. D. Arnold, Chapter 3, Pt. 4, p. 5-30.

2501. Control of factors affecting the reproducibility of mechanical properties of refractory semi-dry press specimens, L. E. Mong and

D. M. Adelman. J. Am. Ceram. Soc. 41, No.

7, 267 (1958). 2502. Correlation correction to the activation energy for diffusion in crystalline solids, J. R. Manning. Phys. Rev. Letters 1, No. 10, 501

(1958). 2503. Corrosion research at the National Bureau

of Standards, J. Kruger. J. Ind. Eng. Chem.

50, 55A (1958). 2504. Covariances of least- squares estimates when residuals are correlated, M. M. Siddiqui. Ann. Math. Stat. 29, 1251 (19 58). 2505. Creep and static strengths of large bolted

joints of forged aluminum alloys under various temperature conditions, L. Mordfin, G. E. Greene, N. Halsey, R. H. Harwell, Jr., and

R. L. Bloss. Inst, of Aeronaut. Sci. Preprint

No. 779 (1958). 2505A. 1958 critique of VHF ionospheric scatter communication. (Survey Paper), R. C. Kirby. Record of Natl. Symp. on Extended Range and Space Communications, October 6-7, 1958 (Washington, D. C. ), p. 90 (1958). 2506. Cryostat for electron bombardment and

electron diffraction work, E. M. Horl and L. Marton. Rev. Sci. Instr. 29, No. 10, 859 (1958). 2507. Crystallization kinetics in polymeric sys- tems, L. Mandelkern. Chapter in the book "Growth and Perfection of Crystals, " p. 467

(John Wiley and Sons, New York, N. Y. ) (1958). 2508. Crystallographic data for yohimbine hydrochloride, G. Burley and G. M. Brown. Anal. Chem. 30, 154 (1958). 2509. Crystallography of cold drawn music wire,

H. C. Burnett and C. J. Newton. Wire and Wire Products 33, No. 1, 66 (1958). 2510. Unassigned.

2511. Degradation of collagen by heat, J. M.

Cassel. J. Am. Leather Chemists Assoc. 53, 507 (1958). 2512. Demands on teachers in a technological

society, F. W. Brown. Colorado School J. 14

(1958). 2513. Design and construction of a blackbody and its use in the calibration of a grating spectroradiometer, G. T. Lalos, R. J. Corruccini, and H. P. Broida. Rev. Sci. Instr. 29, 505 (1958). 2514. Design data for ortho-parahydrogen converters. D. H. Weitzel, C. C. Van Valin and

J. W. Draper. Proc. 1957 Cryogenic Engineering Conference, Paper B-2, p. 73. Edited by

K. D. Timmerhaus. Chemical Engineering

Dept. , University of Colorado (Boulder, Colorado) (1958). 2515. Design of simple DC resistance thermo- meter bridges for wide-range temperature control, R. D. Goodwin. Paper E-5, p. 254. Edited by K. D. Timmerhaus. Chemical Engineering Dept. , University of Colorado (Boulder, Colorado) (1958).

142
2516. Design of simple resistance thermometer

bridges for wide- range control of low temperatures, R. D. Goodwin. Rev. Sci. Instr. 29, 497 (1958). 2517. Determination of reducing sugars and re- ducing end groups in polysaccharides by reaction

with carbon- 14- labeled cyanide, J. D. Moyer

and H. S. Isbell. Anal. Chem. 30, No. 12, 1975

(1958). 2518. Determination of some compressive properties of human enamel and dentin, J. W. Stanford, G. C. Paffenbarger, J. W. Kumpula, and W. T. Sweeney. J. Am. Dental Assoc. 57, 487

(1958). 2519. Developments in instruments. W. T. Sweeney. Intern. Dental J. 8, No. 2, 238 (1958). 2520. Dielectric properties of titania or tin oxide containing varying proportions of rare-earth

oxides, S. Marzullo and E. N. Bunting. J. Am.

Ceram. Soc. 41, No. 1, 40 (1958). 2521. Differential thermal analysis above 1200°

C, T. F. Newkirk. J.Am. Ceram. Soc. 41, 409 (1958). 2522. Digital reduction of spectrophotometric

data to Munsell renotations, H. J. Keegan, W. C. Rheinboldt, J. C. Schleter, J. P. Menard, and D. B. Judd. J. Opt. Soc. Am. 48, 863 (1958). 2523. Dimensional stability of denture base

resins, W. E. Mowery, C. L. Burns, G. Dickson, and W. T. Sweeney. J. Am. Dental Assoc.

57, 345 (1958). 2524. Direct nitrogen calibration of dead space

in gas absorption systems, W. V. Loebenstein.

J. Chem. Phys. 29, No. 1, 236 (1958). 2525. Discussion of the paper - "Heat treatment

affects properties of enamel-steel composites, " by J. H. Healey and L. K. Breeze - J. C. Rich- mond. J. Am. Ceram. Soc. 41, 386 (1958). 2526. Distillation of hydrogen isotopes, T. M.

Flynn, K. D. Timmerhaus, and D. H. "Weitzel. Colorado Engr. 55, 12 (1958). 2527. Distribution of a serial correlation coefficient near the ends of the range, M. M.

Siddiqui. Ann. Math. Stat. 29, 852 (1958). 2528. Effect of calcium treatment on solubility and calcium uptake of synthetic hydroxyapatite and rat molar enamel, R. C. Likins, A. S. Posner, and A. C. Steere. J. Am. Dental Assoc. 57, 335 (1958). 2529. Effect of degree in orientation and crystal

size on the scattering of 20-kev electrons by aluminum, L. Marton, J. A. Simpson, J. A.

Suddeth, M. D. Wagner, and H. Watanabe.

Phys. Rev. 110, No. 5, 1057 (1958). 25 30. Effect of suspension position on apparent

values of internal friction determined by Forster's method, J. B. Wachtman, Jr., and W. E.

Tefft. Rev. Sci. Instr. 29, No. 6, 517 (1958). 2531. Unassigned.

2532. Effect of transverse atmospheric drag on

satellite orbits, W. A. Wildhack. Science 128, 309 (1958). 2533. Effects of molding pressure on strength properties of glass-fiber reinforced plastics,

S. D. Toner, I. "Wolock, and F. W. Reinhart. SPE J. 14, 40 (1958).

2534. Elastic properties of pure-gum rubber

vulcanizates, L. A. Wood. Proc. Joint ArmyNavy-Air Force Conf. on Elastomer Research

and Development 2, 5th meeting (October 1958)

p. 363 (Materials Laboratory, Wright Air Devel- opment Center, Wright-Patterson Air Force

Base, Ohio) (1958). 2535. Elastic scattering of photons by tantalum,

E. G. Fuller and E. V. Hayward. Phys. Rev.

Letters 1, No. 12, 465 (1958). 2536. Elasticity, strength, and other related properties of some refractory castables, S. J. Schneider and L. E. Mong. J. Am. Ceram.

Soc. 41, No. 1, 27 (1958). 2537. Electrical contact resistance of copper, copper functions at low temperatures, R. L. Powell and A. A. Aboud. Rev. Sci. Instr. 29, 248 (1958). 2538. Electrochemical calorimetry, J. M. Sherfey and A. Brenner. J. Electrochem. Soc. 105, 665 (1958). 2539. Electroluminescence from the surface

layer of BaTiO-, SrTiO, and associated

materials, G. G. Harman. Phys. Rev. Ill, No. 1, 27 (1958). 2540. Unassigned.

2541. Electron absorption spectrometer using an improved velocity analyzer, L. Marton and

J. A. Simpson. Rev. Sci. Instr. 29, No. 7, 567 (1958). 2542. Electron impact studies of sulfur dioxide and sulfuryl fluoride, R. M. Reese, V. H. Dibeler, and J. L. Franklin. J. Chem. Phys.

29, No. 4, 880 (1958). 2543. Electronic structure of some diatomic

hydrides, M. Krauss. J. Chem. Phys. 28, 1021 (1958). 2544. Emission spectra from mixtures of atomic nitrogen and organic substances, N. H. Kiess and H. P. Broida. 7th Symp. on Combustion (Butterworths, London, England), p. 207 (1958). 2545. Emission spectroscopy, B. F. Scribner. Anal. Chem. 30, 596 (1958). 2546. Energy release from discharged monatomic

gasses trapped at 4°K, G. J. Minkoff and F. I. Scherber. J. Chem. Phys. 28, No. 5, 992

(1958). 2547. Epoxy resins as cryogenic structural adhesives, R. M. McClintock and M. J. Hiza. Proc. 1957 Cryogenic Engineering Conference, Paper Fl -3, p. 305. Edited by K. D. Timmerhaus. Chemical Engineering Dept. , University

of Colorado (Boulder, Colorado) (1958); Modern

Plastics 35, 172 (1958). 2548. Essential similarity: a counter-example,

A. J. Goldman. Am. Math. Monthly (Math. Notes) 65, 564 (1958). 2549. Etalons de temps atomiques et moleculaires au National Bureau of Standards, R. C. Mockler. Proces- Verbaux des Seances, Rapport et Annexes, IRE Session (1957), Comite Consultatif pour

la Definition de la Seconde, p. 38. (Comite Inter- national des Poids et Mesures. 2. serie, tome

26B) Paris, France, Gauthier- Villars (1958).

143
2550. Etalons et mesures de frequence et d'in- tervalle de temps aux Etats-Unis d^Amerique de 1954 a 1957, W. D. George. Proces Verbaux

des Seances, Rapport et Annexes, IRE Session

(1957) , Comite' Consultatif pour la Definition de

la Seconde, p. 34. (Comite International des Poids et Mesures, Proces- Verbaux des Seances.

2. serie, tome 26-B) Paris, France, GauthierVillars (1958). 2551. Evaluation of bremsstrahlung cross

sections at <:he high-frequency limit, U. Fano,

H. W. Koch, and J. W. Motz. Phys. Rev. 112, No. 5, 1679 (1958). 2551A. Evaporation of active species trapped in a solid condensed from discharged nitrogen,

H. P. Broida and M. Peyron. J. Chem. Phys.

28, 725 (1958). 2552. Exact solution for a gyromagnetic sample

and measurements on a ferrite, H. E. Bussey

and L. A. Steinert. IRE Trans. Microwave

Theory and Tech. MTT-6, 72 (1958). 2553. Excitation of surface waves on plane and

curved impedance boundaries, J. R. Wait. Congres International sur la Propagation des Ondes Radio- Electriques, October 6-11, 1958

(Liege, Belgium). .Resume des communications,

p. 26 (1958). 2554. Excitation of the oxygen red lines in twilight, J. W. Chamberlain. Astrophys. J. 127, No. 1, 54 (1958). 2555. Experimental evaluation of the oxygen microwave absorption as a possible atomic

frequency standard, J. M. Richardson. J. Appl. Phys. 29, No. 2, 137 (1958). 2556. Experimental photodetachment cross

section and the ionospheric detachment rate for

0 (!), S. J. Smith, D. S. Burch, and L. M.

Brans comb. Ann. Geophys. Tome 14, No. 2, 225 (1958). 2557. Experiments on the beta-decay of polarized nuclei, E. Ambler, R. W. Hayward, D. D. Hoppes, and R. P. Hudson. Proc. Kamerlingh

Onnes Conference, Leiden, Holland, 1958, Physica (Supplement) 24, S64 (1958). 2558. Expression in terms of molecular distri- bution functions for the entropy density in an

infinite system, R. E. Nettleton and M. S. Green. J. Chem. Phys. 29, 1365 (1958). 2559. Extension of the Munsell renotation sys- tem, J. C. Schleter, D. B. Judd, and H. J. Keegan. J. Opt. Soc. Am. 48, 863 (1958). 2560. Extreme useful range of VHF transmission by scattering from the lower ionosphere, R. C. Kirby. IRE Natl. Conv. Record 6, Pt. 1, 112

(1958) . 2561. Fabrication techniques for ceramic X-band

cavity resonators, M. C. Thompson, Jr. , F. E. Freethey, and D. M. Waters. Rev. Sci. Instr.

29, No. 10, 865 (1958). 2562. Fifty years of signal lighting, F. C. Breckenridge. Ilium. Eng. 53, 311 (1958). 2563. Fire research in the United States, A. F. Robertson. Fire Research and Fire Prevention Conf. , 1958 Bulletin No. 2, Division Building Research, Natl. Research Council Pub. NRC

5011, p. 51 (Ottawa, Canada) (1958). 2564. First meeting on radio climatology, B. R. Bean. Proc. IRE Letter 46, 1425 (1958).

2565. Flame spread properties of building

finish materials, D. Cross and J. Loftus. ASTM

Bull. No. 230 (1958). 25 66. Flexural cracks in reinforced concrete beams, M. Chi and A. F. Kirstein. J. Am.

Concrete Inst. No. 54 (1958). 2567. Fluoridation, A. S. Posner. Encyclopedia of Chemistry, Supplement, p. 128

(Reinhold Publishing Co. , New York, N. Y. ) (1958). 2568. Fractional factorial experiments of 2m3 n

series, W. S. Conner. Proc. 14th Annual Clinic

of the Rochester Society for Quality Control, February 18, 1958 (Rochester, New York), p. 59 (1958). 2569. Fracture phenomena and molecular weight

in polymethyl methacrylate, S. B. Newm,*n and

I. Wolock. J. Appl. Phys. 29, No. 1, 49 (1958). 2570. Free radical stabilization in condensed

phases, S. Golden. J. Chem. Phys. 29, 61 (1958). 2571. Free radical statistics, J. L. Jackson and

E. W. Montroll. J. Chem. Phys. 28, 1101

(1958). 2572. Free radicals research symposium, J. W.

Moyer. Phys. Today 11, 14 (1958). 2573. Further identities and congruences for

the coefficients of modular forms, M. Newman.

Can. J. Math. 10, 577 (1958). 2574. Gains of finite-size corner- reflector antennas, H. V. Cottony and A. C. Wilson. IRE Trans. Ant. Prop. AP-6, No. 4, 366 (1958). 2575. Glass dewars for optical studies at low

temperatures, L. J. Schoen, L. E. Kuentzel, and H. P. Broida. Rev. Sci. Instr. 29, No. 7, 633 (1958). 2576. Glass transition temperatures of copoly- mers, L. A. Wood. J. Polymer Sci. 28, No.

117, 319 (1958). 2577. Handmade bolts support the Capitol dome,

L. K. Irwin. Fasteners 13, No. 3, 5 (1958). 2578. Harmonic generation with ideal rectifiers, C. H. Page. Proc. IRE 46, No. 10, 1738

(1958). 2579. Heat transfer in laminar flow, M. Abramowitz. Abstracts of Short Communications and

Scientific Programme, International Congress

of Mathematicians (Edinburgh, Scotland) 135

(1958). 2580. Heat transfer measurements on refriger- ated-food trailers, H. D. Johnson, J. C. Winter,

C. W. Phillips, J. W. Grimes, and P. R. Achenbach. U. S. Dept. of Agriculture, Agricultural Marketing Service (AMS-250) (June

1958). 2581. Heat transfer to boiling liquid nitrogen and hydrogen flowing axially through narrow

annular passages, R. J. Richards, R. F. Robbins, R. B. Jacobs, and D. C. Holten. Proc.

1957 Cryogenic Engineering Conference, Paper

G-3, p. 375. Edited by K. D. Timmerhaus,

Chemical Engineering Department, University

of Colorado (Boulder, Colorado) (1958). 2582. Heats of adsorption from charge-transfer complex theory, R. J. Brodd. J. Phys. Chem.

62, 54 (1958).

144
2583. High-frequency impedance standards at the National Bureau of Standards, R. C. Powell,

R. M. Jickling, and A. E. Hess. IRE Trans.

Instrumentation 1-7, No. 3-4, 270 (1958). 2584. High-frequency magnetic permeability measurements using toroidal coils, R. D. Harrington and R. C. Powell. Proc. IRE 46, 784 (1958). 2585. High-frequency standards of the Electronic

Calibration Center, National Bureau of Standards, Boulder Laboratories, Boulder, Colorado, M. C.

Selby. IRE Trans. Instrumentation 1-7, No. 3-4, 262 (1958). 2586. High input impedance transistor amplifier,

G. F. Montgomery. Electronic Design 6, No.

16, 48 (1958). 2587. High-speed computations in the kinetics

of free- radical degradation, I. Random initiation. R. Simha, L. A. Wall, and J. Bram. J. Chem.

Phys. 29, No. 4, 894 (1958). 2588. High-vacuum temperature gradient furnace,

L. Marton and J. A. Suddeth. Rev. Sci. Instr.

29, No. 5, 440 (1958). 2589. History of the International Commission

on Radiological Protection, L. S. Taylor. Health Physics J. 1, 2 (1958). 2590. Hydrogen liquefaction cycles, J. Macinko,

D. B. Chelton, and J. Dean. Proc. 1957 Cryogenic Engineering Conference, Paper A-l, p. 1. Edited by K. D. Timmerhaus, Chemical

Engineering Dept. , University of Colorado

(Boulder, Colorado) (1958). 2591. Ignition of Kel-F and teflon, L. Greenspan.

Rev. Sci. Instr. 29, 172 (1958). 2592. Immiscibility and surface tension of some

simple borates, A. B. Bestul, L. Shartsis, and

H. F. Shermer. J. Am. Ceram. Soc. 41, 507

(1958). 2593. Importance of the Faraday to elemental

constants and electricity standards, R. D. Huntoon and A. G. McNish. Nature 181, 1194

(1958). 2594. Impregnation of sole leather with polymers,

B. H. Fouquet and J. R. Kanagy. J. Am.

Leather Chemists Assoc. 53, No. 6, 336 (1958). 2595. Improved dimensional stability in laminated map paper, G. L. McLeod and T. L. Worksman.

Tech. Assoc. Pulp Paper Ind. 41, No. 9, 484

(1958). 2596. Improved electrical differentiation of retarding potential measurements, L. B. Leder

and J. A. Simpson. Rev. Sci. Instr. 29, No. 7, 571 (1958). 2597. Improvements in liquid scintillators, H.

H. Seliger. Proc. Northwestern Technical

Institute Symp. on Liquid Scintillation Counting,

p. 115 (Pergamon Press, New York, N. Y.

)

(1958). 2598. Influence of lower permissible levels on atomic operations in the United States, L. S. Taylor. Proc. 2d Intern. Conf. on the Peaceful Uses of Atomic Energy, United Nations

(Geneva, Switzerland) 23, 211 (1958). 2599. Infrared absorption of oxygen discharge

products and ozone at 4°K, K. B. Harvey and A. M. Bass. J. Mol. Spectroscopy 2, 405 (1958). 2600. Infrared phase-contrast reflectometer, W. S. Rodney and E. Djurle. J. Opt. Soc. Am.

48, No. 6, 388 (1958).

2601. Input-output, key or bottleneck, R. D. Elbourn. Proc. Computer Applications Symp. , October 29-30, 1958 (Armour Research Foundation, Chicago, Illinois), p. 69 (1958). 2602. Instrumentation- -where we stand, A. V. Astin. ASTM Bull. No. 232, 7 (1958). 2603. Internal barrier in ethane, D. R. Lide,

Jr., J. Chem. Phys. Note 29, 1426 (1958). 2604. Ionization and dissociation of hydrazoic

acid and methyl azide by electron impact, J. L. Franklin, V. H. Dibeler, R. M. Reese, and M. Krauss. J. Am Chem. Soc. 80, 298 (1958). 2605. Isolation of the diffusion layer at an elec- trode and the determination of concentration

polarization, T. Yannakopoulos and A. Brenner.

J. Electrochem. Soc. 105, No. 9, 521 (1958). 2606. Isotope effect in oxidation of D-mannitol- 2-C^ by acetabacter suboxydans, H. L. Frush

and L. J. Tregoning. Science 128, No. 3324, 597 (1958). 2607. Kinetic spectroscopy in the far ultraviolet: the flash photolysis of ethyl compounds,

B. A. Thrush. Proc. Roy. Soc. 243, 555 (1958). 2608. Kinetics of the high temperature hetero- geneous reaction of chlorine and nickel between

1200 and 1700° K, J. D. McKinley, Jr., and K.

E. Shuler. J. Chem. Phys. 28, No. 6, 1207

(1958). 2609. La medida de la luz y el color, D. B. Judd. Anales Real Soc. Espan. Fis. y Quim.

(Madrid, Spain)53A, 43 (1958). 2610. Laboratory tests with turboprop lubri- cants, H. S. White. Am. Soc. Lubrication Engrs. Trans. 1, 51 (1958). 261 OA. Liquid helium cryostat with an integral super- conducting resonator, E. Maxwell and F. A. Schmidt. Suppl. au Bull, de l'Institut Intern, du Froid, Commission 1, Delft, Holland, Annexe 1958-1, p. 95 (1958). 2611. Limitations in the photographic dosimetry

of X- and gamma- rays, W. L. McLaughlin and M. Ehrlich. Radiation Research 9, No. 1, 148

(1958). 2612. Limiting resolution of electron spectro- meters, L. Marton. Rev. Sci. Instr. 29, No. 5, 438 (1958). 2613. Liquid-flowmeter calibration techniques, M. R. Shafer and F. W. Ruegg. Trans. Am.

Soc. Mech. Engrs. 80, No. 7, 1369 (1958). 2614. Liquid scintillation counting, H. H.

Seliger. Proc. Symp. on Measurements and

Standards of Radioactivity, Natl. Acad. Sci. , Natl. Research Council, Nuclear Science Series No. 24, 47 (1958). 2615. Low and medium frequency radio propagation (abstract), K. A. Norton. Congres Intern, sur la Propagation des Ondes Radio-Electriques, October 6-11, 1958 (Liege, Belgique) Resume

des communications, p. 20 (1958). 2616. Low-angle X-ray diffraction of fibrous polyethylene, L. Mandelkern, C. R. Worthington, and A. S. Posner. Science 127, 1052 (1958). 2617. Unassigned.

2618. Low temperature distillation of hydrogen

isotopes, K. D. Timmerhaus, D. H. Weitzel, and T. M. Flynn. Chem. Eng. Progr. 54, No.

6, 35 (1958). 2619. Low- temperature microcell for infrared study of condensed gases, J. E. Stewart. Anal. Chem. 20, 2073 (1958).

145
1958 2620. Low-temperature properties of plastic foams, R. M. McClintock. Soc. of Plastics Engrs. J. 14, No. 11, 36 (1958). 2621. Unassigned.

2622. Luminescence of solid nitrogen (4. 2°K)

containing atoms of free radicals. Effect of traces of oxygen, hydrogen and water vapor,

H. P. Broida and M. Peyron. J. Phys. Radium

19, No. 4, 480 (1958). 2623. Mass spectrometric study of the decomposition of hydrazoic acid by the electric dis- charge, J. L. Franklin, J. T. Herron, P.

Bradt, and V. H. Dibeler. J. Am. Chem. Soc.

80, 6188 (1958). 2624. Mass spectrometry, V. H. Dibeler and

R. M. Reese. Anal. Chem. 30, 604 (1958). 2625. Materials of construction: their properties and methods of test, A. T. McPherson, J. Am.

Inst. Arch. 29, No. 3, 143 (1958). 2626. 50 Mc oblique transmission experiment

near the magnetic equator, R. S. Cohen and K.

L. Bowles. IRE Trans. Ant. Prop. AP-6, 316

(1958). 2627. Measurement of light and color, D. B. Judd. Ilium. Eng. 53, 61 (1958). 2628. Measurement of the gamma- ray dose near the interface between two media, W. F.

Titus. Nuclear Sci. and Eng. 3, No. 5, 609

(1958). 2629. Mechanical failures of metals in service,

J. A. Bennett and W. L. Holshouser. Eng. Materials Handb. 36, 2 (1958). 2630. Mechanical properties of high polymers,

H. Leaderman. Ann. Rev. Phys. Chem. 9, 179

(1958). 2631. Mechanisms of polymer formation and de- composition, R. Simha and L. A. Wall. Catalysis Series 6, Chapter 3, p. 191, edited by P. H. Emmett (Reinhold Publ. Co. , New York, N. Y. ) (1958). 2632. Mechanized computation of thermodynamic

tables at the National Bureau of Standards - The

calculation of the equilibrium composition and thermodynamic properties of dissociated and

ionized gaseous systems, J. Hilsenrath and J. H. Wegstein. Proc. Joint Conf. on Thermodynamic and Transport Properties of Fluids, London, England, July 10-12, 1958 (Institution

of Mechanical Engineers, London, England), p. 79 (1958). 2633. Mechanized conversion of colorimetric

data to Munsell renotations, W. C. Rheinboldt and J. P. Menard. J. Opt. Soc. Am. 48, 864

(1958). 2634. Unassigned.

2635. Microbiological fractionation of the hydrogen isotopes, P. E. Cloud, Jr. , V. H. Dibeler,

I. Friedman, and F. D. Sisler. Science 127, 3311 (1958). 2636. Microwave double- sweep method for analysis of time-dependent cavity characteristics

S. Ruthberg. Rev. Sci. Instr. 29, No. 11, 999

(1958). 2637. Microwave spectra of molecules exhibiting internal rotation. III. Trimethylamine, D. R.

Lide, Jr. , and D. E. Mann. J. Chem. Phys.

27, 572 (1958). 2638. Microwave spectra of molecules exhibiting internal rotation. IV. Isobutyane, tertiary butyl

fluoride and trimethylphospine, D. R. Lide, Jr. , and D. E. Mann. J. Chem. Phys. 29, 914 (1958).

2639. Miscellaneous observations on the alkali- aggregate reaction and the ionic charge on hydrated cement, R. G. Pike and D. Hubbard.

Natl. Acad. Sci. , Natl. Research Council, Publ. Highway Research Board Bull. 171, p. 16 (1958). 2639A. Modulation studies of VHF ionospheric

scattering, J. W. Koch. Record of Natl. Symp.

on Extended Range and Space Communications,

October 6-7, 1958 (Washington, D. C. ), p. 114 (1958). 2640. Movements of airglow cells, F. E. Roach,

E. Tandberg-Hanssen, and L. R. Megill. J. Atmospheric and Terrest. Phys. 13, 122 (1958). 2641. Multipurpose standard for microchemical

analysis, W. H. Smith. Anal. Chem. 30, 149

(1958). 2642. Mutarotation, hydrolysis, and rearrange- ment reactions of glycosylamines, H. S. Isbell and H. L. Frush. J. Organic Chem. 23, 1309

(1958). 2643. Narrow hyperfine absorption lines of Cg ^ in various buffer gases, E. C. Beaty and P. L. Bender. Phys. Rev. 112, No. 2, 450 (1958). 2644. NBS alpha standards, coincidence counting, and radiative electron capture, R. W. Hayward. Proc. Symp. on Measurements and

Standards of Radioactivity, Natl. Acad. Sci. , Natl. Research Council, Nuclear Science Series No. 24, 12 (1958). 2645. Near infrared solar radiation measurements by balloon to an altitude of 100, 000 ft. , D. M. Gates, D. G. Murcray, C. C. Shaw, and R. J. Herbold. J. Opt. Soc. Am. 48, No.

12, 1010 (1958). 2646. Net heat of combustion of aviation gasoline and its correlation with other properties, G. T. Armstrong, R. S. Jessup, and T. W. Mears. Chem. & Eng. Data Series 3, 20 (1958). 2647. New apparatus at the NBS for absolute capacitance measurement, M. C. McGregor,

J. F. Hersh, R. D. Cutkowsky, F. K. Harris, and F. R. Kotter. IRE Trans. Instrumentation

1-7, No. 3-4, 253 (1958). 2648. Nonresonant absorption of symmetric top molecules. Collision cross section, G. Birnbaum

and A. A. Maryott. J. Chem. Phys. 29, 1422 (19 58), 2649. Note on accelerating components in particle spectrometers, H. Mendlowitz. Rev. Sci. Instr.

29, No. 8, 701 (1958). 2650. Note on circular disks containing the eigenvalues of a matrix, K. Fan. Duke Math.

J. 25, 441 (1958). 2651. Note on the determination of molecular

structure from spectroscopic data, V. W.

Laurie. J. Chem. Phys. 28, 704 (1958). 2652. Unassigned.

2653. Nuclear matter distributions from coherent

neutral pion production, J. E. Leiss and R. A.

Schrack. Rev. Modern Phys. 30, No. 2, 456

(1958). 2654. Numerical experiments in potential theory

using the Nehari estimates, U. Hochstrasser. Math. Tables and Other Aids to Computation 12, 26 (1958). 2655. Observation of vertical-incidence scatter from the ionosphere at 41 Mc/sec. , K. L. Bowles. Phys. Rev. Letters 1, No. 12, 454

(1958). 2656. Off-path propagation at VHF, V. C. Pineo. Proc. IRE 46, 922 (1958). 2657. On a determinantal inequality, M. Marcus. Am. Math. Monthly (Math. Notes) 65, 266 (1958).

146
195 2658. On doubly stochastic transforms of a

vector, M. Marcus. Oxford Quart. J. Math.

9, 74 (1958). 2659. On Gauss' speeding up device in the theory

of single step iteration, A. M. Ostrowski. Math.

Tables and Other Aids to Computation 12, No. 62,

116 (1958). 2660. On- off temperature control for electrically heated filaments, R. E. Little and J. D. McKinley, Jr. , Rev. Sci. Instr. 29, No. 12, 1143

(1958). 2660A. On prediction of system behavior, J. R. Rosenblatt. Proc. of the New York UniversityIndustry Conf. on Reliability Theory (New York,

N. Y. ), p. 39 (June 1958). 2661. On the approximate daytime constancy of

the absorption of radio waves in the lower

ionosphere, S. Chapman and K. Davies. J. Atmospheric and Terrest. Phys. 13, 86 (1958). 2662. On the behavior in the large of the integral curves of a non-linear differential equation, A.

Ghaffari. Abstracts of Short Communications

and Scientific Programme, Intern. Congress of Mathematicians (Edinburgh, Scotland), p. 50

(1958). 2663. On the bounds of a one -parametric family

of matrices, A. M. Ostrowski. J. Reine Angew.

Math. (Berlin, Germany) 200,190 (1958). 2664. On the calculation of properties of gases

at elevated temperatures, i. Amdur and J. Ross. Combustion and Flames 2, 412 (1958). 2665. On the calculations of transverse current

loss in buried wire ground systems, J. R. Wait.

Appl. Sci. Research 7, Sec. B, 81 (1958). 2666. On the derivative of Bessel functions with respect to the order, F. Oberhettinger. J. Math.

Phys. 37, 75 (1958). 2667. On the electroviscous effect in dilute aqueous solutions on ionic detergents, R. A. Parker and S. P. Wasik. J. Phys. Chem. 62, 967 (1958). 2668. On the interpretation of hydrodynamic

data for dilute protein solutions, L. Mandelkern

and H. A. Scheraga. J. Phys. Chem. 62, 370

(1958). 2669. On the long-range correlation model of the photonuclear effect, M. Danos. Nuclear Phys.

5, 23 (1958). 2670. On the measurement of ground conductivity

at VLF, J. R. Wait and A. M. Conda. IRE Trans.

Ant. Prop. AP-6, No. 3, 273 (1958). 2671. On the perturbation of the vibrational equilibrium distribution reactant molecules by

chemical reactions, K. E. Shuler. 7th Symp.

on Combustion (Butterworths, London, England),

p. 87 (1958). 2672. On the quality of gray tin crystals and

their rate of growth, J. H. Becker. J. Appl.

!_Phys. 29, No. 7, 1110 (19 58). 2673. On the theory of propagation of electro- magnetic waves along a curved surface, J. R.

Wait. Can. J. Phys. 36, 9 (1958). 2674. On the transmission error function for meteor-burst communication, G. F. Montgomery.

Proc. IRE 46, 1423 (1958). 2675. On the use of the early Balmer lines to extend the photospheric model, R. G. Athay and

R. N. Thomas. Astrophys. J. 127, No. 1, 96

(1958).

2676. Operation of bearings and pumps at low

temperatures, K. B. Martin, R. B. Jacobs, and R. J. Hardy. Proc. 1957 Cryogenic Engineering Conference, Paper D-6, p. 209. Edited by

K. D. Timmerhaus. Chemical Engineering

Dept. , University of Colorado (Boulder, Colorado)

(1958). 2677. Optical detection of narrow Rb° ' hyperfine absorption lines, P. L. Bender, E. C. Beaty, and A. R. Chi. Phys. Rev. Letters 1, No. 9, 331 (1958). 2678. Oscillatory galvanomagnetic effects in n-type indium arsenide, H. P. R. Frederikse and W. R. Hosier. Phys. Rev. 110, 880 (1958). 2679. Output of a sound source in a reverberation chamber and other reflecting environments,

R. V. Waterhouse. J. Acoust. Soc. Am. 30, 4 (1958). 2680. Oxidative degradation of a series of deuterated styrene polymers, M. Tryon and L. A. Wall. J. Phys. Chem. 62, No. 6, 697 (1958). 2681. Oxygen red lines in the airglow, I. Twilight and night excitation processes, J. W.

Chamberlain. Astrophys. J. 127, No. 1, 54

(1958). 2682. Pattern of an antenna on a curved lossy

surface, J. R. Wait and A. M. Conda. IRE

Trans. Ant. Prop. AP-6, No. 4, 348 (1958). 2683. Photodetachment cross section and the electron affinity of atomic oxygen, L. M.

Brans comb, D. S. Burch, S. J. Smith, and S. Geltman. Phys. Rev. Ill, No. 2, 504 (1958). 2684. Photodetachment of 02

-, D. S. Burch, S.

J. Smith, and L. M. Branscomb. Phys. Rev.

112, 171 (1958). 2685. Photometer for measurement of the

effective intensity of condenser-discharge lights, C. A. Douglas. Ilium. Eng. 53, 205 (1958). 2686. Photoneutron yields in the rare-earth

region, E. G. Fuller, B. Petree, and M. S. Weiss. Phys. Rev. 112, No. 2, 554 (1958). 2687. Physical properties of chromium cobalt

alloys, D. F. Taylor, W. A. Leibfritz, and

A. G. Adler. J. Am. Dental Assoc. 56, 343

(1958). 2688. Physical properties of plastic teeth, W.

T. Sweeney, E. L. Yost, and J. G. Fee. J. Am. Dental Assoc. 56, 883 (1958). 2689. Physics- -The electrostatic field and the symmetry of snowflakes, R. A. Schrack. J. Wash. Acad. Sci. 48, No. 9, 273 (1958). 2690. Piezoelectric effect in indium antimonide,

J. H. Wasilik and R. B. Flippen. Phys. Rev.

Letters 1, No. 7, 233 (1958). 2691. Pilot plant studies of the low temperature

distillation of hydrogen isotopes, T. M. Flynn, K. D. Timmerhaus, and D. H. Weitzel. Proc.

1958 Cryogenic Engineering Conference, Paper

H-l, p. 464. Edited by K. D. Timmerhaus,

Chemical Engineering Dept. , University of Colorado (Boulder, Colorado) (1958); Chem.

Eng. Progr. 54, No. 6, 35 (1958). 2692. PILOT, the NBS multicomputer system,

A. L. Leiner, W. A. Notz, J. L. Smith, and

A. Weinberger. Proc. Eastern Joint Computer

Conf. (Philadelphia, Pennsylvania) p. 164 (1958). 2693. Plastic phosphor matrix for fast neutron

detection, B. Brown and E. C. Hooper, Jr. Nucleonics 16, 96 (1958). 2694. Polarization near the high-frequency limit

of 500-kev bremsstrahlung, J. W. Motz and R.

C. Placious. Phys. Rev. 112, No. 4, 1039 (1958).

147
2695. Possible movements of 5577 airglow, F.

E. Roach, E. Tandberg-Hanssen, and L. R.

Megill. J. Atmospheric and Terrest. Phys.

13, 122 (1958). 2696. Precision measurement and race for technological supremacy, A. V. Astin. Mag.

of Standards 29, No. 2, 36 (1958). 2697. Preface to Proc. 3d Symp. on cosimical

gas dynamics, J. M. Burgers and R. N. Thomas.

Smithsonian Astrophysical Observatory, June

1957 (Cambridge, Massachusetts), Rev. Modern

Phys. 30, 908 (1958). 2698. Pressure-sensitive diaphragm- type null detector, D. White and J. Hilsenrath. Rev.

Sci. Instr. 29, No. 7, 648 (1958). 2699. Pressures developed in cement pastes and mortars by the alkali-aggregate reaction, R. G. Pike. Natl. Acad. Sci. , Natl. Research Council Pub. Highway Research Board Bui. 171, p. 34

(1958). 2700. Probing the ionosphere, A. H. Shapley and R. J. Slutz. In American Geophysical

Union. Geophysics and the IGY, Geophysical Monograph No. 2, 45 (1958). 2701. Production of a square temperature wave

in a filament operating at low temperatures, R. Klein and J. A. Simpson. Rev. Sci. Instr. 29, No. 9, 770 (1958). 2702. Products of cool flame oxidation of propane- 2-C13

, R. E. Ferguson and C. R. Yokley. 7th Symp. on Combustion (Butterworths, London,

England), p. 113 (1958). 2703. Properties of some experimental map

papers containing synthetic fibers, G. L. McLeod. Tappi 41, No. 8, 430 (1958). 2704. Proposed recommendation on ionospheric

vertical soundings after the I. G. Y. , A. H.

Shapley. (Memorandum No. 18), Intern. Sci. Radio Union (U. R. S. I. ) Inform. Bull. No. Ill, 42 (1958). 2705. Protection of molybdenum from oxidation

at elevated temperatures, D. E. Couch, H.

Shapiro, J. K. Taylor, and A. Brenner. J. Electrochem. Soc. 105, No. 8, 450 (1958). 2706. Proton gyromagnetic ratio, R. L. Driscoll and P. L. Bender. Phys. Rev. Letters 1, No.

11, 413 (1958). 2707. Pyrolysis of poly-alpha-methylstyrene, D. W. Brown and L. A. Wall. J. Phys. Chem. 62, 848 (1958). 2708. Quantum mechanical effects on the surface

tension of simple liquids, I. Oppenheim. II Nuovo Cimento Supplemento al IX, No. 1, 180

(1958). 2709. Radiation exposure as a reasonable cal- culated risk, L. S. Taylor. Proc. UNESCO Conf.

(Paris, France), September 1957; Impact 8, 209

(1957); Health Phys. J. 1, 62 (1958). 2710. Radiation monitoring over long-distance

telephone lines and direct field lines, L. Costrell. IRE Trans. Nuclear Sci. NS-5, No. 3, 21 (1958).

2711. Radioactivity of In120 Sb120

, C. L. McGinnis. Phys. Rev. 109, 888 (1958). 2712. Radioactivity standardization in the United

States, W. B. Mann and H. H. Seliger. Proc.

2d Intern. Conf. on the Peaceful Uses of Atomic

Energy, United Nations (Geneva, Switzerland)

21, 90 (1958). 2713. Radio propagation research at the National Bureau of Standards, F. W. Brown. Am. J. Phys. 26, 628 (1958).

2714. Radium standards, internal gas counting and the United States radioactivity standards program, W. B. Mann. Proc. Symp. on Measurements and Standards of Radioactivity,

Natl. Acad. Sci. , Natl. Research Council, Nuclear Science Series, No. 24, 17 (1958). 2715. Rapid impact loading of textile yarns, J. C. Smith. Proc. Symp. on High-speed Testing, Plas-Tech. Equipment Corp. , (Interscience Publ. Inc., New York, N. Y. ) (1958). 2716. Rapport sur l'etalonnage de deux lampes

etalons secondaires a ruban de tungstene par

quatre laboratories nationaux, H. J. Kostkowski. Proces- Verbaux Comite Consultatif de Thermometrie, aupres du Comite International de Poids

et Mesures (Paris, France) 5, 133 (1958). 2717. Reaction of carbon monoxide with g*aphite carbon at 450° C, V. R. Deitz and E. J. Prosen. Nature 118, 109 (1958). 2718. Reactions of hexafluorobenzene, W. J. Pummer and L. A. Wall. Science 127, 643 (1958). 2719. Recent deveopments in NBS spectrographic

standard samples of iron-base alloys, R. E. Michaelis. Appl. Spectroscopy 12, 114 (1958). 2720. Recent developments in the field of micro- wave power measurements at the National Bureau

of Standards, G. F. Engen. IRE Trans. Instru- mentation 1-7, No. 3-4, 304 (1958). 2721. Recent theoretical studies of the propagation of long waves (abstract), J. R. Wait. Congres

Intern, sur la Propagation des Ondes Radio-Electriques, October 6-11, 1958 (Liege, Belgium). Resume des communications p. 27 (1958). 2722. Recently developed microwave impedance

standards and methods of measurement, R. W.

Beatty and D. M. Kerns. IRE Trans. Instru- mentation 1-7, No. 3-4, 319 (1958). 2723. Reduction of adjacent- channel interference components from frequency- shift-keyed carriers, A. D. Watt, V. J. Zurich, and R. M. Coon. IRE Trans. Commun. Systems CS-6, 39 (1958). 2724. Refinement of the hydroxyapatite structure, A. S. Posner, A. Perloff, and A. F. Diorio. Acta Cryst. 11, 308 (1958). 2725. Unassigned.

2726. Refractive index of arsenic trisulfide, W.

S. Rosney, I. H. Malitson, and T. A. King.

J. Opt. Soc. Am. 48, No. 9, 633 (1958). 2727. Refractive index of synthetic sapphire,

I. H. Malitson, V. F. Murphy, Jr. , and W. S. Rodney. J. Opt. Soc. Am. 48, No. 1, 72 (1958). 2728. Regulated supply offsets line changes, L. Costrell. Electronics 31, 100 (1958). 2729. Relation between actual and artificial weathering, F. W. Reinhart. Am. Soc. Testing Materials Spec. Tech. Publ. No. 236, 57 (1958). 2730. Removal of nitrogen from hydrogen with

silica gel at low temperatures, V. J. Johnson. Proc. 1958 Cryogenic Engineering Conference, Paper A-2, p. 11. Edited by K. D. Timmerhaus,

Chemical Engineering Dept. , University of Colorado (Boulder, Colorado) (1958). 2731. Report on atomic weights for 1956-57, E. Wichers. J. Am. Chem. Soc. 80, 4121 (1958). 2732. Report on reducing sugars, E. J. McDonald. J. Assoc. Official Agri. Chem.. 41, No. 3, 623 (1958). 2733. Report on the determination of small amounts of radium in solution, J. E. Harding, A. Schwebel, and L. L. Stockman. J. Assoc.

Official Agri. Chem. 41, No. 2, 311 (1958).

148
2734. Research at NBS Boulder Laboratories on

quartz crystal resonators and oscillators at low

temperatures, F. P. Phelps and A. H. Morgan.

Proc. 12th Annual Symp. on Frequency Control, May 6-8, 1958, U. S. Army Signal Research and Development Laboratory (Ft. Monmouth, New

Jersey), p. 162 (1958). 2735. Research in normal threshold of hearing,

J. P. Albrite, R. E. Shutts, M. B. Whitlock,

Jr., R. K. Cook, E. L. R. Corliss, and M. D. Burkhard. A. M. A. Arch. Otolaryngol. 68, 194

(1958). 2736. Research in plating at the National Bureau

of Standards, A. Brenner. Plating Management

3, No. 5, 14 (1958). 2737. Research is everybody's business, A. V.

Astin. Tappi 41, No. 5, 14A (1958). 2738. Resins in prosthetic dentistry, W. T. Sweeney. Chapter in the Dental Clinics of North America, p. 593 (W. B. Saunders Co.,

Philadelphia, Pennsylvania) (19 58). 2739. Resistance measurement of ceramic-type

strain- gage cements, J. W. Pitts, E. Buzzard,

and D. G. Moore. Am. Soc. Testing Materials

Spec. Tech. Publ. No. 230, 67 (1958). 2740. Response functions of total- absorption spectrometers, H. W. Koch and J. M. Wyckoff. Reprint IRE Trans. Nuclear Sci. NS-5, No. 3, 127 (1958). 2741. Response of a large sodium iodide

scintillation detector to high energy X-rays, J. H. Hubbell. Rev. Sci. Instr. 29, No. 1, 65

(1958). 2742. Reverberation chamber study of the sound power output of subsonic air jets, R. V. Waterhouse and R. D. Berendt. J. Acoust. Soc. Am.

30, 114 (1958). 2743. Reversible contractile processes in fib- rous macromolecules, L. Mandelkern, D. E. Roberts, and A. F. Diorio. J. Am. Chem. Soc.

80, 500 (1958). 2744. Review of analytical distillation, R. T. Leslie and E. C. Kuehner. Anal. Chem. 30, 629 (1958). 2745. Revision of Commercial Standard CS115-44

for porcelain enameled hot water tanks, J. C. Richmond. Proc. Porcelain Enamel Inst. 20,

51 (1958). 2746. RF permeameter techniques for testing

ferrite cores, A. L. Rasmussen and A. E. Hess.

Elec. Mfgr. 61, 86 (1958). 2747. RF voltmeter calibrating consoles, M. C.

Selby, L. F. Behrent, and F. X. Ries. IRE

Natl. Conv. Record 6, Pt. 5, 251 (19 58). 2748. Scientific developments and methods in practice (Dentistry in 19 67), G. C. Paffenbarger

and R. L. Bowen. J. Am. Dental Assoc. 56, 785 (1958). 2749. Scintillation counting in experiments on

parity conservation, R. W. Hayward and D. D. Hoppes, Proc. 6th Scin. Counter Symp. IRE

Trans. Nuclear Science NS-5, 161 (1958). 2750. Scintillation counting of beta emitters, H.

H. Seliger. Proc. Intern. Conf. on radioisotopes

in Scientific Research UNESCO (1958). 2751. Separation of hydrogen isotopes by multi- component distillation, T. M. Flynn, K. D. Timmerhaus, D. H. Weitzel, and J. W. Draper.

Proc. 1957 Cryogenic Engineering Conference, Paper A- 6, p. 58. Edited by K. D. Timmerhaus.

Chemical Engineering Dept. , University of Colorado (Boulder, Colorado) (1958).

2752. Separation of isomeric polyphenyls by

adsorption chromatography, M. Hellmann, R.

L. Alexander, Jr., C. F. Coyle. Anal. Chem.

30, 1206 (1958). 2753. Separation of the products of cool flame

oxidation of propane, C. R. Yokley and R. E. Ferguson. Combustion and Flame 2, No, 2,

117 (1958). 2754. Shape of liquid immiscibility volume in the system barium oxide-boric oxide- silica, E. M. Levin and G. W. Cleek. J. Am. Ceram.

Soc. 41, No. 5, 175 (1958). 2755. Shape of the high-energy end of the electron bremsstrahlung spectrum, E. G.

Fuller, E. V. Hayward, and H. W. Koch. Phys. Rev. 109, 630 (1958). 2756. Silicate cement: How to select and use them, G. C. Paffenbarger and J. W. Stanford. Dental Practioner 8, No. 12, 387 (19 58). 2757. Simplified approach to spin in Dirac theory, H. Mendlowitz. Am. J. Phys. 26, No. 1, 17 (1958). 2758. Single path phase measuring system for three- centimeter radio waves, M. C. Thompson, Jr., and M. J. Vetter. Rev. Sci. Instr. 29, 148 (1958). 2759. Solar cycle influence on the lower iono- sphere on the VHF forward scatter, C. D.

Ellyett and H. Leighton. Proc. IRE 46, No. 10,

1711 (1958). 2760. Some characteristics of VLF propagation

using atmospheric waveforms, W. L. Taylor

and L. J. Lange. In Recent Advances in Atmospheric Electricity; Proc. 2d Conf. on atmospheric Electricity, Portsmouth, New Hampshire, May 20-23, 1958 (Pergamon Press, New York, N. Y. ), p. 609 (1958). 2761. Some mechanical properties of Mylar and Dacron polyester strands at low temperatures,

R. P. Mikesell and R. P. Reed. Rev. Sci. Instr. 29, No. 8, 734 (1958). 2762. Some properties of diamond, E. N, Bunting and A. Van Valkenburg. Am. Mineralogist

43, 102 (1958). 2763. Some properties of glasses in the system varium oxide-boric oxide- silica, E. H. Hamiltion, G. W. Cleek, and O. H. Grauer. J. Am.

Ceram. Soc. 41, No. 6, 209 (1958). 2764. Some properties of lightning impulses which produce whistlers, R. A. Helliwell, A.

G. Jean, and W. L. Taylor. Proc. IRE Letter

46, 1760 (1958). 2765. Some properties of polymer networks formed from oriented chains of natural rubber,

D. E. Roberts and L. Mandelkern. J. Am.

Chem. Soc. 80, 1289 (1958). 2766. Some studies of the upper atmosphere in the auroral zone, S. Matsushita. Ann. Geophys.

14, 483 (1958). 2767. Source function in a non- equilibrium atmosphere. II. Depth dependence of source

function for resonance and strong subordinate

lines, J. T. Jeffries and R. N. Thomas.

Astrophys. J. 127, No. 3, 667 (1958). 2768. Source of the non-migratable ionic charges

developed by portland and high- alumina cements

during hydration, R. G. Pike and D. Hubbard.

Natl. Acad. Sci. , Natl. Research Council, Proc. Highway Research Board, 37, 256 (1958). 2769. Unassigned.

149
2770. Spectral band-pass determinations by a dynamic approach, I, Nimeroff and J. Laufer.

J. Opt. Soc. Am. 48, 864 (1958). 2771. Spectroscopic study of electronic flame temperatures and energy distributions, H. P. Broida and K. E. Shuler. Rev. French Inst. Petro. and Ann. Combus. Liquid 13, 620 (1958). 2772. Splitting of the giant resonance for de- formed nuclei, E. G. Fuller and M. S. Weiss.

Phys. Rev. 112, No. 2, 560 (1958). 2773. Sporadic E observed on VHF oblique in- cidence circuits, E. K. Smith. North Atlantic Treaty Organization. Sporadic E Ionization, Ionospheric Research Meeting, AGARD Avionics

Panel, September 1958 (Cambridge, England), AGARDograph 34, p. 129 (1958). 2774. Stabilized free radicals, J. L. Jackson.

J. Wash. Acad. Sci. 48, No. 6, 181 (1958). 2775. Stable nitrogen isotope analysis by

optical spectroscopy, H. P. Broida and M. W.

Chapman. Anal. Chem. 30, No. 12, 2049 (1958). 2776. Standards and measurements for electronics, A. V. Astin. IRE Trans. Instrumentation 1-7, No. 3-4, 134 (1958). 2777. Unassigned. 2777A. Standards - good and bad, A. T. McPherson. Boletime de Metrologia No. 4,

7, (1958). 2778. Statistical mechanical theory of transport processes, I. Oppenheim. Proc. Midwestern

Conf. on Theoretical Phys. Washington University (St. Louis, Mo.) p. 142 (1958). 2779. Statistical methods in chemistry, J. Mandel and F. J. Linnig. Anal. Chem. 30, 739 (1958). 2780. Statistical treatment of analytical data,

J. Mandel. Proc. Conf. on Chemical Control Problems, Natl. Plant Food Instr. , p. 1 (October 1958). 2781. Status of absolute measurements at the National Bureau of Standards, R. L. Driscoll,

J. L. Thomas, and R. D. Cutkosky. ProcesVerbaux, C. I. P. M. , p. 36 (1958). 2782. Strains in beams having diagonal cracks,

D. Watstein and R. G. Mathey. J. Am. Concrete Inst. 30, No. 6,Title No. 55-46 (1958); Proc. Am. Concrete Inst. 55, 717 (1958-59). 2783. Stress- strain relationship in yarns subjected to rapid impact loading. V. Wave propagation in long textile yarns impacted transversly, J. C. Smith, F. L. McCrackin, and

H. F. Schiefer. Textile Research J. 28, No. 4, 288 (1958). 2784. Stroboscopic interferometer for vibration measurement, E. R. Smith, S. Edelman,

E. Jones, and V. A. Schmidt. J. Acoust. Soc. Am. 30, 867 (1958). 2785. Structural interpretation of immiscibility

in oxide systems: 3. Effect of alkalis and alumina in ternary systems, E. M. Levin and

S. Block. J. Am. Ceram. Soc. 41, No. 2, 49 (1958). 2786. Studies in nonequilibrium rate processes.

III. The vibrational relaxation of a system of anharmonic oscillators, N. W. Bazley, E. W.

Montroll, R. J. Rubin, and K. E. Shuler. Errata in J. Chem. Phys. 29, No. 5, 1185

(1958).

2787. Studies in nonequilibrium rate processes.

IV. The rotational and vibrational relaxation of a system of rotating oscillators, R. C. Herman

and K. E. Shuler. J. Chem. Phys. 29, 366

(1958). 2788. Studies of leather fungicides, S. Dahl and A. M. Kaplan. J. Am. Leather Chemists

Assoc. 53, 103 (1958). 2789. Studies of stress-corrosion cracking of Austenitic stainless steel, H. L. Logan. Research Suppl. Welding J. 37, 463S (1958). 2790. Suppression of bubbling in boiling refrigerants as an aid in optical measurements,

G. J. Minkoff and F. L Scherber. J. Opt. Soc. Am. 48, 358 (1958). 2791. Sur les limites du pouvoir de resolution des spectrometres corpusculaires , L. Marton.

Bull. acad. roy. de Belg. , p. 159 (March 1958). 2792. Surface erosion of filled plastics, S. B. Newman, S. D. Toner and Achhammer, B. G. Modern Plastics 36, 135 (1958). 2793. Surface resistivity of cotton, wool, and

nylon fabrics at different temperatures and

relative humidities, H. H. Walker. Textile Research J. 28, No. 12, 1047 (1958). 2794. Surface tension measurements with a

strain- gauge- type testing machine, S. B. New- man and W. M. Lee. Rev. Sci. Instr. 29, 785 (1958). 2795. Synthetic cuspidine, A. Van Valkenberg

and G. F. Rynders. Am. Mineralogist 43, Nos. 11 and 12, 1195 (1958). 2796. Tables of line strengths for rotational transitions of asymmetric rotor molecules,

R. H. Schwendeman and V. W. Laurie. (Pergamon Press, London, England) (1958). 2797. Technical aspects of large scale liquid helium liquefaction and transportation, D. B. Mann, B. W. Birmingham, and P. C. Vander

Arend. Proc. 1957 Cryogenic Engineering

Conference, Paper D-4, p. 191. Edited by

K. D. Timmerhaus. Chemical Engineering

Dept. , University of Colorado (Boulder, Colorado) (1958). 2798. Temperature dependence of the characteristic energy loss of electrons in aluminum, L. B. Leder and L. Marton. Phys. Rev. 112, No. 2, 341 (1958). 2799. Temperature du point du zinc et comparison de deux determinations du point du

soufre dans un appareil ferme, J. L. Riddle. Proces-Verbaux Comite Consultatif de Thermometrie, auxpres du Comite Intern, des Poids

et Mesures (Paris, France) 5, 111 (1958). 2800. Temperature microcell for infrared study

of condensed gases, J. E. Stewart. Anal. Chem. 30, 2073 (1958). 2801. Tension testing of rubber rings, F. L. Roth and R. D. Stiehler. ASTM Bull. No. 233, 38 (1958). 2802. Test for dimensional changes in woven

fabrics in high temperature laundering, W. D. Appel. Am. Dye stuff Reptr. 47, No. 7, 213

(1958). 2803. The addition of hydrogen atoms to solid

olefins at -19 5°, R. Klein and M. D. Scheer.

J. Am. Chem. Soc. 80, 1007 (1958). 2803A. The algebra of electronics, C. H. Page

(D. Van Nostrand Co. Inc., New York, N. Y.

(1958).

150
2804. The ammonia maser as an atomic fre- quency and time standard, R. C. Mockler,

J. Barnes, R. Beehler, H. Salazar, and

L. Fey. IRE Trans. Instrumentation 1-7, No. 3-4, 201 (1958). 2805. The application of the theory of stochastic processes to chemical kinetics, E. W. Montroll and K. E. Shuler. Adv. in Chem. Phys. 1, 361

(Interscience Pub. Inc., New York, N. Y. ) (1958). 2806. The atmospheric bending of radio waves

(Abstract), B. R. Bean. Congres International sur la Propagation des Ondes Radio-Electriques, October 6-11, 1958 (Liege, Belgium). Resume

des Communications p. 3 (1958). 2807. The characteristic size of airglow cells, F. E. Roach, E. Tandberg-Hanssen, and

L. R. Megill. J. Atmospheric and Terrest. Phys. 13, 113 (1958). 2808. The coefficients in an allocation problem,

R. J. Aumann and J. B. Kruskal. Naval Research Logistics Quart. 5, 111 (1958). 2809. The definition and measurement of the time constant and response time of thermal

converters, F. L. Hermach. Trans. Am.

Inst. Elec. Engrs. 77, Ft. I, 277 (1958); Communications and Electronics, No. 37, 277

(1958). 2810. The effect of echo on the operation of high frequency communication circuits, D. K. Bailey. IRE Trans. Ant. Prop. AP-6, No. 4, 325 (1958). 2810A. The elasticity of rubber, L. A. Wood.

Rubber Chem. and Technol. 31, No. 5, 959

(1958). 2811. The electrolytic preparation of molybdenum

from fused salts. V. Electrorefining studies in the presence of tin, iron, copper, silicon, and

nickel, D. E. Couch and S. Senderoff. Trans.

Metallurgical Soc. of Am. Inst. Metallurgical Engrs. p. 320 (1958). 2812. The electron affinity of atomic oxygen,

L. M. Branscomb. Nature 182, 248 (1958). 2813. The energy dissociation of the C-H bond in the formyl radical, R. Klein and L. J. Schoen.

J. Chem. Phys. Comments and Errata 29, 953

(1958). 2814. The evaluation of matrix inversion prograrr M. Newman and J. Todd. J. Soc. Indust. Appl. Math. 6, 466 (1958). 2815. The Haystaq system: past, present and

future, H. R. Koller, E. Marden, and H.

Pfeffer. Preprinted in Proc. Intern. Conf. on

Scientific Info. November 11-16, 1958 (American Documentation Inst. , Washington, D. C.

)

Area 5, p. 317 (1958). 2816. Unassigned.

2817. The height of nightglow 5577, F. E. Roach, L. R. Megill, M. H. Rees, and E. Marovich. J. Atmospheric and Terrest. Phys.

12, Nos. 2/3, 171 (1958). 2818. The helium-vapor pressure scale of temperatures, F. G. Brickwedde. Phys. Today

11, 23 (1958). 2819. The impact testing of various alloys at low temperatures, R. P. Mike sell and R. P. Reed. Proc. 1957 Cryogenic Engineering Conference, Paper F-4, p. 316. Edited by K. D. Timmerhaus. Chemical Engineering Dept. , University of Colorado (Boulder, Colorado)

(1958).

2820. The infrared spectrum of tertiary butyl

fluoride, D. E. Mann, N. Acquista, and D. R.

Lide, Jr. J. Mol. Spectroscopy 2, 575 (1958). 2821. The interpretation of night-time low- fre- quency ionograms, J. M. Watts. J. Geophys. Research 63, 717 (1958). 2822. The Kosters double- image prism, J. B. Saunders. Appendic C of "Concepts of Classical Optics", p. 393 (W. H. Freeman and

Co., San Francisco, California) (19 58). 2823. The mean deviation of the Poisson distri- bution, E. L. Crow. Biometrika 45, 556 (1958). 2824. The need for more knowledge of materials

in civil engineering, A. T. McPherson. Conf. Basic Research in Civil Engr. September 10-11,

1958. Am. Soc. Civil Engrs. Natl. Sci. Foundation, George Washington University (Washington, D. C. ) p. 20 (1958). 2825. The night airglow, F. E. Roach. American Geophysical Union. Geophysics and

the IGY, Geophysical Monograph No. 2, 97,

(1958). 2826. The patterns of a slot-array antenna on a

finite and imperfect ground plane, J. R. Wait

and A. M. Conda. L'Onde Electrique 38, No.

376 bis (Proc. Intern. Congress Ultra High Frequency Circuits and Antennas, October 21-26,

1957, Paris, France) p. 7 (1958). 2827. The program of training and graduate in- struction in dental materials at the National Bureau of Standards, W. T. Sweeney. J. Dental Educ. 22, 217 (1958). 2828. The reaction of hydrogen atoms with solid

olefins at -19 5°, R. Klein and M. D. Scheer.

J. Phys. Chem. 62, 1011 (1958). 2829. The reaction of metal oxides with

o- ethyoxybenzoic acid and other chelating

"agents, E. M. Brauer, E. E. White, Jr. and M. G. Moshanos. J. Dental Research 37, 547

(1958). 2830. The sky and eye, F. E. Roach and P. M.

Jammick. Sky and Telescope. 17, 164(1958).

2831. The specific volume and degree of crystallinity of poly(chlorotribluoroethylene),

J. D. Hoffman and J. J. Weeks. J. Polymer

Sci. 28, No. 117, 472 (1958).

s, 2832. The Stokes flow problem for a class of axially symmetric bodies, L. E. Payne and W. H. Pell. Abstract, Notices Am. Math.

Soc. 5, 468 (1958). 2833. The structure of ethylene from infrared

spectra, H. C. Allen, Jr. and E. K. Plyler.

J. Am. Chem. Soc. 80, 2673 (1958). 2833A. The thermal E. M. F. of several thermometric alloys, R. L. Powell and M. D. Bunch. Supplement au Bulletin de l'Institut Intern, du Froid (Delft, Holland), Comm. 1, 129 (1958). 2834. The thermodynamic driving force in nucleation and growth processes, J. D. Hoff- man. Chem. Phys. Note 29, No. 5, 1192

(1958). 2835. The uniqueness of the triangular association scheme, W. S. Connor. Ann. Math. Stat. 29, 262 (1958). 2836. The use of group divisible designs for asymmetrical factorial arrangements, M. Zelen. Ann. Math. Stat. 29, 22 (1958). 2837. The use of nickel- aluminum alloy coatings

for the protection of molybdenum from oxidation, D. E. Couch, H. Shapiro, and A. Brenner. Elec- trochem. Soc. 105, No. 8, 485 (1958).

151
19 E 2838. The use of sweep- frequency backscatter

data for determining oblique- incidence ionos- pheric characteristics, R. Silber stein. J. Geophys. Research 63, 335 (1958). 2839. The zirconium- hydrogen system: Some

thermodynamic properties from a heat content

study, T. B. Douglas. J. Am. Chem. Soc. 80, 5040 (1958). 2840. Theory of the stark effect of the NO molecule, M. Mizushima. Phys. Rev. 109, No. 5, 1557 (1958). 2841. Theory of threshold energy dependence of photodetachment of diatomic molecular negative

ions, S. Geltman. Phys. Rev. 112, No. 1, 176 (1958). 2841A. Thermal and electrical conductivity of aluminum and aluminum alloys, W. J. Hall, H. M. Roder, and R. L. Powell. In LowTemperature Physics and Chemistry; 1957 Proc.

5th International Conf. , University of Wisconsin

(Madison, Wisconsin), p. 389 (1958). 2841B. Thermal and electrical conductivity of pure copper, H. M. Roder, R. L. Powell, and W. J. Hall. In Low- Temperature Physics and

Chemistry; 1957 Proc. 5th Intern. Conf. , University of Wisconsin (Madison, Wisconsin),

p. 364 (1958). 2842. Thermal conductivities of common

commercial aluminum alloys, W. J. Hall, R. L. Powell, and H. M. Roder. Proc. 1957 Cryogenic

Engineering Conference, Paper G-6, p. 408. Edited by K. D. Timmerhaus, Chemical Engi- neering Dept. , University of Colorado (Boulder, Colorado) (19 58). 2843. Thermal degradation of polymers at temperatures up to about 800-900 °C, S. L. Madorsky. Proc. Joint Army- Navy- Air Force

Conf. on Elastomer Research and Development,

2, 5th meeting (October 1958), p. 511 (Materials Laboratory, Wright Air Development Center, Wright- Patterson Air Froce Base, Ohio) (1958). 2844. Thermal diffusion in ionized gases, S. Chapman. Proc. Phys. Soc. 72, 353 (1958). 2844A. Thermal emf of some thermometric

alloys, M. D. Bunch, R. L. Powell, and R. J. Corruccini. In Low- Temperature Physics and

Chemistry; 1957 Proc. 5th Intern. Conf., University of Wisconsin (Madison, Wisconsin),

p. 484 (1958). 2845. Thermoconductivity of tin- indium alloys

in the normal state, C. A. Shiftman. Proc.

Phys. Soc. (London, England) 71, No. 460, 597 (1958). 2846. Thermodynamics of crystallization in high polymers: Poly(ethylene), F. A. Quinn, Jr. and

L. Mandelkern. J. Am. Chem. Soc. 80, 3178

(1958). 2847. Thermometric study of the frozen products from the nitrogen microwave discharge, B. J. Fontana. J. Appl. Phys. 29, 1668 (1958). 2848. Time-temperature behavior of rubber from measurements of indentation hardness, F. L. Roth. Proc. Joint Army- Navy- Air Force Conf. on Elastomer Research and Development 2, 5th meeting (October 1958), p. 399 (Materials Laboratory, Wright Air Development Center, WrightPatterson Air Force Base, Ohio) (1958). 2849. To the edge of space, A. H. Shapley.

Sci. Teacher 25, No. 2, 69 (1958).

2850. Topological proofs for certain theorems

on matrices with non- negative elements, Ky

Fan. Monatsch. Math. 62, 219 (1958). 2851. Transmission loss curves for propagation

at very low radio frequencies, J. R. Wait. IRE

Trans. Commun. Systems CS-6, No. 2, 58

(1958). 2852. Transmittance and reflectance of cesium

iodide in the far infrared region, E. K. Plyler and N. Acquista. J. Opt. Soc. Am. 48, No. 9, 668 (1958). 2852A. Transport properties of dilute alloys of copper, R. L. Powell, W. J. Hall, and H. M.

Roder. Physica 24, S176 (1958). 2853. Trapped radicals, H. P. Broida, Endeavor 17, 208 (1958). 2854. Tropospheric effects on 6-MC pulses, R. Silber stein. Proc. IRE Letter 46, No. 1, 1968 (1958). 2855. Two forms of mathematical induction, A. Schach. Math. Mag. 32, No. 2, 83 (1958). 2855A. United States planning for the large

scale liquefaction and transportation of helium,

D. B. Mann and B. W. Birmingham. Physica

24, S144 (1958). 2856. Unscrambling of gamma- ray scintillation spectrometer pulse-height distributions, J. H. Hubbell and N. E. Schofield. IRE Trans. Nuclear Sci. NS-5, No. 3, 156 (1958). 2857. Unsteady nonlinear waves in sloping channels, R. F. Dressier. Abstracts of Short Communications and Scientific Programme, In- tern. Congress of Mathematicians (Edinburg,

Scotland) 138 (1958); Proc. Roy Soc. [ A] , 247, 186 (1958). 2858. Using an electronic computer to reduce weathering test data, A. Potter. Proc. Porcelain Enamel Inst. 20, 73 (1958). 2859. Vapor phase ortho-para conversion in the large CEL-NBS hydrogen liquefier, W. A. Wilson

and D. H. Weitzel. Proc. 1957 Cryogenic

Engineering Conference, Paper B-3, p. 85. Edited by K. D. Timmerhaus. Chemical Engineering Dept. , University of Colorado (Boulder, Colorado) (1958). 2860. Vertical distribution of light from gasfilled candlepower standards, L. E. Barbrow

and S. W. Wilson. Blum. Eng. 53, 645 (1958). 2861. Vibration- rotation bands of ammonia. III. The region 3.2-4.3 microns, E. .K. Plyler, W. S. Benedict, and E. D. Tidwell. J. Chem.

Phys. 29, 829 (1958). 2862. Vibrational energy exchange between

diatomic molecules and a surface, R. C. Herman

and R. J. Rubin. J. Chem. Phys. 29, 591 (1958). 2863. Viscoelastic phenomena in amorphous high polymeric systems, H. Leaderman. Chapter 1, page 1, Vol. U. Rheology- theory and application (Academic Press Inc., New York, N. Y.) (1958). 2864. Viscosity density, and electrical resistivity of molten alkaline- earth borate glasses

with three mole percent of potassium oxide, L. W. Coughanour, L. Shartsis, and H. F. Shermer. J. Am. Ceram. Soc. 41, 324 (1958). 2865. Wall effects on rotational population of OH2 £+ in a microwave discharge, T. Carrington and H. P. Broida. J. Mol. Spectroscopy 2, No.

3, 273 (1958).

152
2866. Wax batteries, R. E. Wood. Proc. 12th Annual Battery Research and Develop. Conf. Sponsored by Power Sources Div. U. S. Army

Signal Corp. Research & Devel. Lab. (Ft. Mammouth, New Jersey), p. 62 (1958). 2867. Unassigned.

2868. Wind- induced vibration of telephone and

distribution conductors, R. R. Bouche, A. A. Lee, C. R. Ballard, and F. J. On. Am. Inst. Elec. Engrs. Middle Eastern District Meeting

Conf. Paper (April 1958). 2869. Wireless microphone uses F-M modulation, G. F. Montgomery. Electronics 31, No. 1, 54 (1958).

1582870. World-wide soundings committee: Memorandum 17- -Future Work, A. H. Shapley. URSI. (Intern. Sci. Radio Union) Info. Bui. No. 110, 55 (July- August 1958). 2871. WWV standard frequency transmissions, W. D. George. Proc. IRE 46, 910 (1958). 2872. WWV standard frequency transmissions,

D. M. Kerns, Proc. IRE Letter 46, 1881

(1958). 2873. Zinc phosphate and silicate cements,

G. C. Paffenbarger and J. W. Stanford. Chapter

in Dental Clin. North America, 561 (W. B. Saunders Co., Philadelphia, Pa.) (1958).

153
2874. A model of the chromosphere from radio and optical data, R. G. Athay. Paris Symp.

Radio Astronomy (IAU Symp. No. 9 and URSI

Symp. No. 1), paper 16, p. 98 (1959). 2875. A model of the electron corona with

reference to radio observations, G. Newkirk,

Jr. Paris Symp. Radio Astronomy (IAU Symp.-

No. 9 and URSI Symp. No. 1), paper 27, p. 149

(1959)« 28764 A new method of checking the consistency

of precedence matrices, R. B. Marimont. J. Assoc. Computing Mach. 6, No. 2, 164 (1959). 2877. A note on the computation of x , M. G.

Natrella. Am. Stat. 13, No. 1, 20 (1959). 2878. A radio- astronomical test of the ballistic theory of light emission, L. R. O. Storey and

R. S. Lawrence. The Observatory Correspondence to Editor 79, No. 911, 150 (1959). 2879. A re- examination to the crystal structure

of a and /3 nitrogen, L. H. Bolz, M. E. Boyd,

F. A. Mauer, and H. S. Peiser. Acta Cryst.

12, 237 (1959). 2880. A relationship between the lower iono- sphere and the Col] 5577 nightglow emission,

J. W. McCaulley and W. S. Hough, J. Geophys. Research 64, No. 12, 2307 (1959). 2881. A statistician and the post office: A case

history in operations research, N. C. Severe

Trans. 1959 Conf. Admin. Appl. Div. of Am.

Soc. Quality Control (Milwaukee, Wis. ) (1959). 2882. A study of limb flares and associated

events, C. S. Warwick and M. B. Wood. Astrophys. J. 128, No. 3, 801 (1959). 2883. A study of 17-7 PH stainless steel, N. L. Carwile and S. J. Rosenberg, WADC Technical Report 58-653 (June 1959). Available from the Office of Technical Services, Department of Commerce, Washington 25, D. C. 2884. A study of the morphology of ionospheric storms, S. Matsushita. J. Geophys. Research

64, 305 (1959). 2885. A survey of the present knowledge of sporadic- E ionization, J. A. Thomas and E. K.

Smith. J. Atmospheric and Terrest. Phys. 13, 295 (1959). 2886. Abelian groups of unimodular matrices,

E. C. Dade. Illinois J. Math. 3, 11 (1959). 2887. Absorption spectrum of vibrationally excited N2 in active nitrogen, K. Dressier. J. Chem. Phys. Letter to Editor 30, 1621 (1959). 2888. Adsorption, diffusion, and evaporation of carbon monoxide on tungsten, R. Klein. J. Chem.

Phys. 31, No. 5, 1306 (1959). 2889. Aerodynamic heating and fatigue, W. D. Kroll. NASA Memorandum 6-4-59W (1959). 2890. Aldehyde, carboxyl, pentosan, and degree

of polymerization data on the ICCA "standard"

pulps, W. L. Morrow. Tech. Assoc. Pulp Paper Ind. 42, No. 3, 169 (1959). 289L American Dental Association contribution

to dental science: Physical research, G. C. Paffenbarger and W. Souder. J. Am. Dental Assoc. 58, 97 (1959). 2892. An evaluation of various thermoplastic materials for use as iodine vapor barriers, S. D. Toner. SPE J. 15, 48 (1959). 2893. An improved 8- hydroxyquinoline method

for the determination of magnesium oxide in Portland cement, H. A. Berman. ASTM Bull. No. 237, 51 (1959).

2894. An infrared study of hydrogen bonding in solid H2

0 and H2 0-H202 mixtures, K. B. Harvey

and P. Giguere. J. Mol. Spectroscopy 3, 36

(1959). 2895. Analysis of millimicrosecond pulses using

a charge- storage type pulse-height analyzer, L. Costrell and R. E. Brueckmann. Proc. 2d Symp.

on Advances in Fast Pulse Techniques for Nuclear Counting, February 12-13, 1959 (University

of California, Berkeley, California) (1959). 2896. Analysis of vibrational relaxation data in shock wave experiments, K. E. Shuler. J. Chem.

Phys. Note 30, 1631 (1959). 2897. Antennas and waveguides, and annotated

bibliography, H. V. Cottony, R. S. Elliott, E. C. Jordan, V. H. Rumsey, K. M. Siegel, J. R. Wait, and O. C. Woodyard. U.S.A. National Committee report, International Sci. Radio Union Subcommission 6. 3. Inst. Radio Engrs.

Trans, on Ant. Prop. AP-7, 87 (1959). 2898. Application of the theory of stochastic processes to chemical kinetics, E. W. Montroll and K. F. Shuler. Chapter in book, Advances in Chemical Physics (Interscience Publishers, New

York, N. Y. ) Vol. I, p. 361 (1959). 2899. Artificial auroras resulting from the 1958 Johnston Island nuclear explosions, J. M. Malville. J. Geophys. Research 64, No. 12, 2267

(1959). 2900. Atomic electron affinities, H. Johnson and

F. Rohrlich. Nature No. 4656, 183 (1959). 2901. Basic physics of atoms and molecules, U. Fano and L. Fano. (John Wiley and Sons, Inc. , New York, N. Y. ) 414 pages (1959). 2902. Beta-gamma correlations from polarized

nuclei, E. Ambler, R. W. Hay-ward, D. D. Hoppes, and R. P. Hudson. Proc. Congres

International de Physique Nucleaire, 1958, Inter- actions Faibles, Chapter III, p. 831 (Paris, France) (1959). 2903. Branched- chain higher sugars. I. A 9-aldo4- C-formyl-nonose derivative, R. S chaffer and

H. S. Isbell. J. Am. Chem. Soc. 81, 2178

(1959). 2904. Branched- chain higher sugars. II. A di- ethylidene-oxtose, R. Schaffer and H. S. Isbell.

J. Am. Chem. Soc. 81, 2838 (1959). 2905. Bremsstrahlung and the photoelectric

effect as inverse processes, K. W. McVoy and

U. Fano. Phys. Rev. 116, No. 5, 1168 (1959). 2906. Can the scales of atomic weights and

nuclidic masses be unified? E. Wichers. Phys. Today 12, No. 1, 28 (1959). 2907. Cavity resonator dielectric measurements

on rod samples, H. E. Bussey. Insulation p. 26 (1959). 2908. Characteristics of deposits, W. H. Metzger, Jr. Am. Soc. Testing Materials Symp. on

Electroless Nickel Plating 265, 13 (1959). 2909. Characterization of the high-speed impact

behavior of textile yarns, J. C. Smith, F. L. McCrackin, and H. F. Schiefer. Conference

Issue J. Textile Inst. (Trans.) 50, No. 1, T55

(1959). 2910. Chemical structure and stability relation- ships in polymers, B. G. Achhammer, M. Tryon, and G. M. Kline. Kunststoffe combined with German Plastics Digest 49, No. 11, 600 (1959); Modern Plastics 37, No. 4, 131 (1959).

154
2910A. Coatings for space vehicles, J. C. Rich- mond. Proc. 1st Symp. Surface Effects on Space and Craft Materials, Sponsored by USAF

Air Research and Development Command and Lockheed Aircraft Corp. , May 12-13, 1959 (Palo Alto, Calif. ), p. 182 (John Wiley and Sons, New York, N. Y. ) (1959).

2911. Comments on the structure of 1, 1, 1-tri- fluoro-2-butyne, V. W. Laurie. J. Chem. Phys.

Letter 30, 1101 (1959). 2912. Comparison of the ionization produced in air by alpha particles near 5-Mev and by beta

particles, Z. Bay and P. A. Newman. Bull. Am. Phys. Soc. 11:4, No. 4, 217 (1959). 2913. Computer defines color, H. J. Keegan. Chem. Eng. News 37, No. 10, 37 (1959). 2914. Conductivity of plasmas to microwaves,

P. H. Fang. Phys. Rev. 113, No. 1, 13 (1959). 2915. Confidence intervals for the expectation

of a Poisson variable, E. L. Crow and R. S. Gardner. Biometrika 46, 441 (1959). 2916. Constant temperature liquid helium bath and reproducibility of resistance thermometers,

H. H. Plumb and M. H. Edlow. Rev. Sci. Instr. 30, 376 (1959). 2917. Contribution of the annihilation radiation

to the gamma- ray flux in lead, M. J. Berger

J. H. Hubbell, and I. Reingold. Phys. Rev.

113, No. 3, 857 (1959). 2918. Convexity of the field of a linear transformation, A. J. Goldman and M. Marcus. Can. Math. Bull. 2, 15 (1959). 2919. Correlation effects in impurity diffusion,

J. R. Manning. Phys. Rev. 116, No. 4, 819

(1959). 2920. Cosmic examples of heat conduction in very rare rotating or expanding gases, S. Chap- man. Extrait des Ann. de Geophys. Tome 15, No. 4, 434 (1959). 2921. Creep behavior of transparent plastics at elevated temperatures, F. L. McCrackin and

C. F. Bersch. SPE Tech Paper 5, 94 (1959). 2922. Cryogenic engineering, R. B. Scott.

(D. Van Nostrand Co. , New York, N. Y. ) (1959). 2923. Crystallization kinetics in polymeric

systems, L. Mandelkern. SPE J. 15, 63

(1959). 2924. Degradation of cellulose acetate films, W.

K. Wilson and B. W. Forshee. SPE J. 15, No. 2, 146 (1959). 2925. Dense subgraphs and connectivitv, R. E. Nettleton, K. Goldberg, and M. S. Green. Can.

J. Math. 11, 262 (19 59). 2926. Departures from the Saha equation under

varying conditions of Lyman continuous opacity,

S. R. Pottasch and R. N. Thomas. Astrophys.

J. 130, No. 3, 941 (1959). 2927. Departures of hydrogen from L. T. E. in a stellar atmosphere and the consequent

structure of the solar chromosphere, S. R. Pottasch. Communications de 1' Observatoire Royal de Belgique No. 157, entitled The empirical

determination of the stellar photospheric structure, Paper 11, 67 (1959). 2928. Determination of acetylene in air in concentrations from ten parts per billion to ten parts per million, E. E. Hughes and R. Gorden'

Jr. Anal. Chem. 31, 94 (1959).

2929. Diffusion of particles in turbulent flow, C. M. Tchen. Advances in Geophysics 6: "Atmospheric diffusion and air pollution", p. 165, Proc. Symp. Oxford, England, August

1958 (Academic Press Inc. , New York, N. Y. ) (1959). 2930. Distribution of matter with temperature

in the emission corona, D. E. Billings. Astrophys. J. 130, No. 3, 961 (1959). 2931. Diurnal change of ionospheric heights deduced from phase velocity, J. R. Wait. Proc. IRE 47, No. 5, 98 (1959). 2932. Downcoming radio waves, measurement of characteristics, J. R. Wait. Elec. and Radio

Engr. 36, No. 3, 106 (1959). 2933. Effect of fluorides on infrared trans- mittance of certain silicate glasses, G. W.

Cleek and T. S. Scuderi. J. Am. Ceram. Soc.

42, No. 12, 599 (1959). 2934. Electrical discharge induced luminescence

of solids at low temperatures, L. J. Schoen

and R. Rebbert. J. Mol. Spectroscopy 3, No. 4, 417 (1959). 2935. Electrical measurements - in the core curriculum, F. R. Kotter. Proc. 3d Natl. Conf. on Analog and Digital Instrumentation, April

20-21, 1959, Philadelphia, Pennsylvania (Sponsored by Recording and Controlling Instru- mentation Committee of AIEE). Am. Inst. Elec. Engrs. p. 15 (1959). 2936. Electrolysis of organic solvents with reference to the electrodeposition of metals, A. Brenner. J. Electrochem. Soc. 106, 148

(1959). 2937. Electron characteristic energy losses in some intermetallic compounds, B. Gauthe. Phys. Rev. 114, No. 5, 1265 (1959). 2938. Electron impact studies of aromatic

hydrocarbons. I. Benzene, napthalene, anthracene, and phenanthrene, M. E. Wacks and V.

H. Dibeler. J. Chem. Phys. 31, No. 6, 1557

(1959). 2939. Electron impact studies of hydrazine and

the methyl- substituted hydrazines, V. H. Dibeler, J. L. Franklin, and R. M. Reese, J. Am. Chem. Soc. 81, 68 (1959). 2940. Electron spin resonance spectra from gamma- irradiated solid nitrogen, L. A. Wall, D. W. Brown, and R. E. Florin. J. Chem.

Phys. 30, No. 2, 602 (1959). 2941. Electronic quenching of OH( 2 2

+

) in flames and its significance in the interpretation of rotational relaxation, T. Carrington. J. Chem.

Phys. 30, 1087 (1959). 2942. Energetic species trapped at 4. 2°K from

gaseous discharges, G. J. Minkoff, F. I. Scherber, and J. S. Gallagher. J. Chem. Phys.

30, 753 (1959). 2943. Etude aux infrarouges de certains solides condenses a partir de decharges en phase

gazeuse, K. B. Harvey and H. W. Brown. J. chim. phys. 56, No. 2392, 745 (1959). 2944. Etude spectroscopique des produits de la decharge electrique dan L'Azote condenses a

l'etat solide a tres basse temperatures, prevues

en faveur de 1' existence d

1 Azote triatomique dan

le solide, M. Peyron, E. M. Horl, H. W. Brown,

and H. P. Broida. J. chim. phys. 56, No. 2392, 736 (1959).

56991S 0—61 11 155
2945. Unassigned.

2946. Experiments with the cell Bi, Bi20 3, ZnCl2 /ZnCl2 /ZnCl2» Zn between 450 and 510°, R. E. Wood. J. Phys. Chem. 63, 525 (1959). 2947. Exposure standards and radiation protection regulations, L. S. Taylor. Section 3, p. 2 Radiation Hygiene Handbook, edited by Hansen Blatz (McGraw-Hill Book Co. , Inc. , New York, N. Y. ) (1959). 2948. Factors affecting the accuracy of distortion measurements made on the nodal slide optical bench, F. E. Washer and W. R. Darling. J. Opt. Soc. Am. 49, No. 6, 517 (1959). 2949. Fading rate recorder for propagation

research, J. W. Koch, W. B. Harding, and

R. J. Jansen. Electronics 32, No. 51, 78 (1959). 2950. False negative permanent strains observed

with resistance wire strain gages, C. J. Newton. ASTM Bull. 235, 42 (1959). 2951. Fatigue properties of high strength steels, H. E. Frankel, J. A. Bennett, and W. A.

Pennington. Trans. Am. Soc. Metals 52 (1959). 2952. Fifty years of signal lighting, F. C. Breckenridge. Brochure issued by the Ilium. Eng. Soc. 21 pages (1959). 2953. Flow conversion kinetics of ortho and

parahydrogen, D. H. Weitzel, J. H. Blake, and M. Konecnik. Proc. 1958 Cryogenic Engineering

Conference, Paper E-2, p. 286. Edited by K.

D. Timmerhaus, Chemical Engineering Dept. , University of Colorado (Boulder, Colorado)

(1959). 2954. Formation of ozone from atomic oxygen

at low temperatures, R. A. Ruehrwein and J.

S. Hashman. J. Chem. Phys. 30, No. 3, 823

(1959). 2955. Future developments of electronic data processing systems, S. N. Alexander. Proc.

8th Annual Symp. Federal Govt. Accountants Assoc., November 17-18, 1958, The Federal

Accountant VIII, No. 4, 28 (1959). 2956. Gamma radiation from Zn&3, R. W. Hayward, E. F. Pessoa, D. D. Hoppes, and R. Van Lieshout. II Nuovo Cimento 11, 53 (1959). 2957. General relations between fluxes from

collimated point and plane sources of radiation, M. J. Berger and L. V. Spencer. Phys. Rev.

113, No. 2, 408 (1959). 2958. Geomagnetic disturbance and velocity of slow-drift solar radio bursts, M. B. Wood and

C. S. Warwick. Nature 184, 1471 (1959). 2959. Geomagnetic effects of high-altitude nuclear explosions, A. G. McNish. J. Geophys. Research 64, No. 12, 2253 (1959). 2960. Green coronal line intensity and geo- magnetism, C. S. Warwick. J. Geophys. Research 64, No. 5, 527 (1959). 2961. High-frequency limit of bremsstrahlung in the Sauter approximation, U. Fano. Phys. Rev.

116, No. 5, 1156 (1959). 2962. IGY instruction manual, Pt. 1: World days and communications, A. H. Shapley. Ann.

Intern. Geophys. Year Vol. 7, Pt. 1, p. 1 (Pergamon Press, New York, N. Y. ) (1959). 2963. IGY observations of F-layer scatter in the far east, R. Bateman, J. W. Finney, E. K. Smith, L. H. Tveten, and J. M. Watts. J. Geophys. Research 64, 403 (1959). 2964. Improvements in liquid scintillators, H.

H. Seliger and B. Agranoff. Anal. Chem. 31, No. 9, 1607 (1959).

2965. Index to the literature on spectrochemical

analysis, Part IV, 1950-1955, B. F. Scribner and W. F. Meggers. Am. Soc. for Testing Materials Publ. No. 41D (1959). 2966. Initial and remanent permeability spectra

of Yttrium iron garnet, R. D. Harrington and

A. L. Rasmussen. Proc. IRE 47, 98 (19>9). 2967. Interference of antioxidant in the deter- mination of low polymer in SBR synthetic rubber, L. T. Milliken and F. J. Linnig. J. Polymer Sci. XLI, No. 138, 544 (1959). 2968. Interference of orbital and spin currents on bremsstrahlung and photoelectric effect, U. Fano, K. W. McVoy, and J. R. Albers. Phys.

Rev. 116, No. 5, 1159 (1959). 2969. Interplanetary space and the earth's outer- most atmosphere, S. Chapman. Proc. Roy.Soc.

A, 253, 462 (1959). 2970. Irreducible tensorial sets, U. Fano and G. Racah. Academic Press Inc. , New York, N.

Y. (1959). 2971. Kinetics of D atom reactions with H2 , R.

Klein, J. R. McNesby, M. D. Scheer, and L.

J. Schoen. J. Chem. Phys. 30, No. 1, 58

(1959). 2972. Kinetics of nitrogen atom recombination,

J. T. Herron, J. L. Franklin, P. Bradt, and

V. H. Dibeler. J. Chem. Phys. Letters 29, No. 1, 230 (1958); J. Chem. Phys. 30, 879 (1959). 2973. La recherche sur les radicaux libres au

National Bureau of Standards, H. P. Broida.

J. chim. phys. 56, No. 2392, 813 (1959). 2974. Leonard Euler's integral: A historical

profile of the gamma function, P. Davis. Am.

Math. Mo. 66, 849 (1959). 2975. Light emission from solid nitrogen during and after electron bombardment, E. M. Horl.

J. Mol. Spectroscopy 3, No. 4, 425 (1959). 2976. Line shape and f value in the OH 2 2 + - 2 7T transition, T. Carrington. J. Chem. Phys.

31, No. 5, 1243 (1959). 2977. Local standards laboratories, A. T. McPherson. Instr. and Automation 32, 92 (1959). 2978. Low- energy limit of the photonuclear pseudodeuteron effect, M. Danos. Bull. Am.

Phys. Soc. Serv. II, 4, 102 (1959). 2979. Low-temperature X-ray studies on Rice's

blue material, L. H. Bolz, F. A. Mauer, and

H. S. Peiser. J. Chem. Phys. 30, No. 1, 349

(1959). 2980. Magnetic losses at low temperatures, E. H. Brown and J. R. Brennand Jr. Proc. 1958 Cryogenic Engineering Conference, Paper A-5,

p. 65. Edited by K. D. Timmerhaus, Chemical

Engineering Dept. , University of Colorado

(Boulder, Colorado) (1959); J. Appl. Phys. 30, No. 1, 112 (1959). 2980A. Magnetic properties of polycrystalline materials, D. M. Grimes, R. D. Harrington, and A. L. Rasmussen. J. Phys. Chem. Solids

12, 28 (1959). 2981. Magnitoye okhlazhdenye, E. Ambler and

R. P. Hudson. Uzpekhi Physicheskhikh Nauk

47, 445 (1959). 2982. Mass spectrometric study of the reactions

of some hydrocarbons with active nitrogen, J. T. Herron, J. L. Franklin, and P. Bradt. Can.

J. Chem. 37, 579 (1959).

156
1959 2983. Measurement of the flow of liquefied gases

with sharp-edged orifices, R. J. Richards, R.

B. Jacobs, and W. J. Pestalozzi. Proc. 1958 Cryogenic Engineering Conference, Paper E-l,

p. 272. Edited by K. D. Timmerhaus, Chemical

Engineering Dept. , University of Colorado

(Boulder, Colorado) (1959). 2984. Measurement systems for high-level dosimetry, E. J. Hart, H. W. Koch, B. Petree,

J. H. Schulman, S. I. Taimuty, and H. O. Wyckoff. 2d United Nations Intern. Conf. on the Peaceful Uses of Atomic Energy, Vol. 21, Health and Safety: Dosimetry and Standards, P/1927 USA, p. 188 (Pergamon Press, London,

England) (1959). 2985. Mechanical properties of insulating plastic foams at low temperatures, R. M. McClintock.

Proc. 1958 Cryogenic Engineering Conference, Paper B-6, p. 132. Edited by K. D. Timmerhaus, Chemical Engineering Department,

University of Colorado (Boulder, Colorado)

(1959). 2986. Mechanism of contraction in the muscle

fibre - ATP system, L. Mandelkern, A. S. Posner, A. F. Diorio, and K. Laki. Proc.

Natl. Acad. Sci. 45, 814 (1959). 2987. Mechanistic aspects of hearing, E. L. R. Corliss. J. Acoust. Soc. Am. Abstract 31, 841 (1959). 2988. Mechanized computation of thermodynamic

tables at the National Bureau of Standards: The

calculation of the equilibrium composition and thermodynamic properties of dissociation and

ionized gaseous systems, J. Hilsenrath, M.

Klein, and D. Y. Sumida. Proc. Symp. Thermodynamic and Transport Properties of Gases,

Liquids, and Solids, (Reprinted from Thermodynamic and Transport Properties of Gases,

Liquids, and Solids), Am. Soc. Mech. Engrs.

p. 416 (1959). 2989. Men and electrons, L. Marton. J. Wash.

Acad. Sci. 49, No. 4, 97 (1959). 2990. Methods of experimental physics, H. P.

R. Frederikse, V. A. Johnson, and W. "W. Scanlon. Chapter 7.6, Thermomelectric

Effects. Edited by K. Lark-Horovitz and V. A. Johnson (Academic Press Inc. , New York, N. Y.) p. 114 (1959). 2991. Microwave spectra of molecules exhibiting internal rotation, V. Barrier height in ethyl- chloride and ethyl bromide, D. R. Lide, Jr. J. Chem. Phys. 30, 37 (1959). 2992. Microwave spectrum of methyl germane,

V. "W. Laurie, J. Chem. Phys. 30, 1210 (1959) 2993. Mismatch errors in cascade-connected

variable attenuators, G. E. Schafer and A. Y. Rumfelt. IRE Trans, on Microwave Theory and

Tech. MTT-7, No. 4, 447 (1959). 2994. Molecular complexes and their spectra.

IX. Infrared absorption by iodine in its pyridine complexes and in benzene, E. K. Plyler and R.

S. Mulliken. J. Am. Chem. Soc. 81, 823 (1959). 2995. Multi- factor experiments, M. Zelen and W. S. Connor. Ind. Quality Control 15, No. 9,

1 (1959). 2996. Multiple ionization of sodium vapor by

electron impact, V. H. Dibeler and R. M.

Reese. J. Chem. Phys. 31, 282 (1959). 2997. Natural and synthetic rubbers: Review of

test methods, M. Tryon and F. J. Linnig. Anal. Chem. Appl. Revs. 31, Pt. II, No. 4, 767 (1959).

2998. New standards for science and industry, A. T. McPherson. Am. Soc. Quality Control, Proc. 4th Annual Quality Control Symp. , (Southern Methodist Univ. , Dallas, Texas), p. 103 (1959). 2999. Note on measurement of sine- wave

response of lenses, R. E. Stephens. J. Opt. Soc. Am. 49, No. 4, 413 (1959). 3000. Nuclear magnetic resonance in semiconductors, O. Kraus. Phys. and Chem. of Solids (Pergamon Press, London, England) 8, 504 (1959). 3001. OH emission in the earth's atmosphere,

D. M. Gates. Proc. 2d Natl. Infrared Information Symp. 4, No. 1, 145 (1959). 3002. On models of the atmospheric radio refractive index, B. R. Bean and G. D. Thayer.

Proc. IRE 47, No. 5, 740 (1959). 3003. On the convergence of the Rayleigh quotient

iteration for the computation of the characteristic

roots and vectors, II, A. M. Ostrowski. Arch.

Rati. Mech. Anal. 2, No. 5, 423 (1959). 3004. On the convergence of the Rayleigh quotient iteration for the computation of characteristic roots and vectors, VI. (Usual Rayleigh

quotient for nonlinear elementary divisors), A. M. Ostrowski. Arch. Rati. Mech. Anal. 4, No. 2, 153 (1959). 3005. On the diffraction of electromagnetic

pulses by curved conducting surfaces, J. R. Wait and A. M. Conda. Can. J. Phys. 37, 1384

(1959). 3006. On the electromagnetic response of an

imperfectly conducting thin dyke, J. R. Wait. Geophysics XXIV, No. 1, 167 (1959). 3007. On the hydrogen evolution reactions, R.

J. Brodd. J. Electrochem. Soc. 106, No. 1, 74 (1959). 3008. On the minimum of the permanent of a doubly stochastic matrix, M. Marcus and M. Newman. Duke Math. J. 26, 61 (1959). 3009. On the numerical integration of periodic

analytic functions, P. Davis. Chapter in the Book On Numerical Approximation, Edited by

R. E. Langer, (University of Wisconsin Press, Madison Wisconsin), p. 45 (1959). 3010. On the theory of reflection from a wire

grid parallel to an interface between homogeneous media (II), J. R. Wait. Appl. Sci. Research Section B, 7, No. 5, 355 (1959). 3011. Optimum antenna height for ionospheric

scatter propagation, R. G. Merrill. IRE Natl. Conv. Record Pt. I, p. 10 (1959). 3012. Photodetachment cross section of the negative hydrogen ion, S. J. Smith and D. S. Burch. Phys. Rev. Letters 2, No. 4, 1645

(1959). 3013. Photolysis of oxygen in solution in liquid nitrogen and in liquid carbon monoxide at 1849 A,

J. R. McNesby. J. Chem. Phys. 31, No. 1, 283 (1959). 3014. Photon scattering and self absorption in lead and bismuth at 7 Mev, E. G. Fuller and E. Hayward. Proc. Congres International de Physique Nucleaire, 1958, Nuclear Reaction in Nuclear Forces, Pt. 2, Chapter I, p. 62 (Paris, France) (1959). 3015. Pile oscillator measurements of eta, C. O. Muehlhause, Nuclear Sci. and Engr. 5, No. 4, 225 (1959).

157
1959

3016. PILOT, a new multiple computer system,

A. L. Leiner, W. A. Notz, J. L. Smith, and

A. Weinberger. J. Assoc. Computing Mach.

6, No. 3, 313 (1959). 3017. Poisoning and reactivation of ortho- parahydrogen conversion catalyst, R. N. Keeler and K. D. Timmerhaus. Proc. 1958 Cryogenic

Engineering Conference, Paper E-3, p. 296. Edited by K. D. Timmerhaus, Chemical

Engineering Dept. , University of Colorado

(Boulder, Colorado) (1959). 3018. Polymorphism in barium disilicate, R.

S. Roth and E. Levin. Am. Mineralogist 44, No. 3-4, 452 (1959). 3019. Prediction of pressure drop in two-phase

single- component fluid flow, M. R. Hatch, R.

B. Jacobs, R. J. Richards, R. N. Boggs, and

G. R. Phelps. Proc. 1958 Cryogenic Engineering Conference, Paper F-4, p. 357. Edited by

K. D. Timmerhaus, Chemical Engineering Dept. , University of Colorado (Boulder, Colorado)

(1959). 3020. Prediction of sunspot numbers for cycle

20, W. B. Chadwick. Nature 184, 1787 (1959). 3021. Present status and future prospects of emission spectroscopy, W. F. Meggers. Rev.

Universelles des Mines (Liege, Belgique), No.

5, p. 7 (1959). 3022. Program of the International Commission

on Radiological Units and Measurements, L. S. Taylor, L. H. Gray, and H. O. Wyckoff. 2d

United Nations Intern. Conf. on the Peaceful Uses of Atomic Energy, Vol. 21, Health and

Safety: Dosimetry and Standards, P/2243 WHO,

p. 81 (Pergamon Press, London, England) (1959). 3023. Propagation and production of electro- magnetic waves in a plasma, R. M. Gallet. II Nuovo Cimento Supplemento 13, No. 1, 234 (1959). 3024. Propagation of a ground wave pluse around

a finitely conducting spherical earth from a damped sinusoidal source current, J. R. Johler, and L. C. Walters. IRE Trans. Ant. Prop. AP-7, No. 1, 1 (1959). 3025. Quantum-mechanical calculation of the probability of an exchange reaction for constrained linear encounters, J. Mazur and R.

J. Rubin. J. Chem. Phys. 31, No. 5, 1395

(1959). 3026. Rack for standard resistors, P. H. Lowrie, Jr. Rev. Sci. Instr. Letter to Editor 30, No. 4, 291 (1959). 3027. Radiation attenuation data, H. O. Wyckoff.

Section 8, p. 1, Radiation Hygiene Handbook,

edited by Hanson Blatz (McGraw-Hill book Co. , Inc., New York, N. Y. ) (1959). 3028. Radiation from a small loop immersed in a semi-infinite conducting medium, J. R. Wait. Can. J. Phys. 37, 672 (1959). 3029. Unassigned.

3030. Reactions en chaine de radicaux geles,

J. L. Jackson. J. chim. phys. 56, No. 2392,

771 (1959). 3031. Recent advances in cryogenic engineering,

R. B. Jacobs. ARS J. 29, No. 4, 245 (1959). 3032. Recent experimental evidence favouring

the pKj(p) correlation function for describing

the turbulence of refractivity in the troposphere and stratosphere, K. A. Norton. J. Atmosspheric and Terrrest. Phys. 15, 206 (1959).

3033. Reception of space diversity transmitters,

J. W. Koch. Wireless World (England) 65, No.

10, 512 (1959). 3034. Reflectors for a microwave Fabry- Perot

interferometer, W. Culshaw. IRE Trans. Microwave Theory and Tech. MTT-7, No. 2, 221 (1959). 3035. Relative measurement of the photodetach- ment cross section for H", S. J. Smith and D.

S. Burch. Phys. Rev. 116, No. 5, 1125 (1959). 3036. Report of the Committee on the American

Standards Association, F. E. Washer. Photo- grammetric Engr. XXV, No. 2, 309 (1959). 3037. Rheology of polyisobutylene. III. Elastic recovery, non-Newtonian flow, and molecular

weight distribution, H. Leaderman, R. G. Smith, and L. C. Williams. J. Polymer Sci.

36, 233 (1959). 3038. Rotational relaxation in nitrogen, oxygen, and air, M. Greenspan. J. Acoust. Soc. Am.

31, 155 (1959). 3039. Sampling of leather, J. Mandel and C. W. Mann. J. Sci. and Ind. Research 18A, No.

12, 575 (1959). 3040. Sauter theory of the photoelectric effect, U. Fano, K. W. McVoy, and J. R. Albers. Phys. Rev. 116, No. 5, 1147 (1959). 3041. Science fairs, A. T. McPherson. ASTM

Bull. No. 237, 29 (1959). 3042. Unassigned.

3043. Selection of glasses for three color achromats, R. E. Stephens. J. Opt. Soc. Am. 49, No. 4, 398 (1959). 3044. Semiautomatic Townsend balance system,

S. B. Garfinkel. Rev. Sci. Instr. 30, No. 6, 439 (1959). 3045. Unassigned.

3046. Some color demonstrations I have shown,

D. B. Judd. J. Opt. Soc. Am. 49, 322 (1959). 3047. Some elementary inequalities relating

to a gamma and incomplete gamma function, W. Gautschi. J. Math. Phys. 39, 77 (1959). 3048. Some evidence for structural anomalies

in pure cristobailite, R. F. Walker, S. J. Schneider, and R. S. Roth. J. Am. Ceram.

Soc. 42, No. 12, 642 (1959). 3049. Some methods for reducing heat leak through support members in liquefied gas

storage vessels, R. W. Arnett, L. O. Mullen, and K. A. Warren. Proc. 1958 Cryogenic

Engineering Conference, Paper G-l, p. 410. Edited by K. D. Timmerhaus, Chemical Engi- neering Dept. , University of Colorado (Boulder, Colorado) (1959). 3049A. Some methods used at the National Bureau of Standards for measuring thermal

emittance at high temperatures, J. C. Richmond.

Proc. 1st Symp. Surface Effects on Space and

Craft Materials. Sponsored by USAF Air Research and Development Command and Lockheed

Aircraft Corp., May 12-13, 1959 (Palo Alto,

Calif. ), p. 182 (John Wiley and Sons, New York,

N. Y. ) (1959).

158
1959

3050. Some properties of flameproof fabrics, M. W. Sandholzer. Am. Dyestuff Reptr. 48, No. 2, 37 (1959). 3051. Some radiological applications of gammaray transport theory, M. J. Berger and L. V. Spencer. Radiation Research 10, No. 5, 552

(1959). 3052. Spectra emitted from solid nitrogen con- densed at very low temperatures from a gas discharge, M. Peyron and H. P. Broida. J. Chem. Phys. 30, No. 1, 139 (1959). 3053. Spectral emittance of ceramic- coated and

uncoated specimens of Inconel and stainless

steel, J. C. Richmond and J. E. Stewart.

J. Am. Ceram. Soc. 42, No. 12, 633 (1959). 3054. Spectroscopic evidence for triatomic

nitrogen in solids at very low temperatures, M. Peyron, E. M. Horl, H. W. Brown, and

H. P. Broida. J. Chem. Phys. 30, 1304 (1959). 3054A. Standard frequency transmission and

time signals, "W. D. George. Proc. 2d all-IRIG Symp. , prepared by Secretariat, Inter-Range

Instrumentation Group, October 1958 (White Sands Missile Range, New Mexico), IRIG Document No. 107-58, 141 (1959). 3055. Standards for neutron flux measurement

and neutron dosimetry, R. S. Caswell, J. Chin, and E. R. Mosburg, Jr. 2d United Nations

Intern. Conf. on the Peaceful Uses of Atomic

Energy, Vol. 21, Health and Safety: Dosimetry

and Standards, P/752, USA, p. 92 (Pergamon

Press, London, England) (1959). 3055A. Status of ASTM methods and standards

for appearance evaluation. I. Nimeroff. Am.

Soc. Testing Materials Spec. Tech. Publ. 258,

3 (1959). 3056. Structural changes in irradiated plastics films, C. F. Bersch, R. R. Stromberg, and

B. G. Achhammer. SPE Tech. Papers 5, 5 (1959). 3057. Studies of borate minerals. VI: Veatchite,

J. R. Clark, M. E. Mrose, A. Perloff, and G. Burley. Am. Mineralogist 44, No. 11-12, 1141 (1959). 3058. Study of the setting of plaster, K. D. Jorgesen and A. S. Posner. J. Dental Research 38, 491 (1959). 3059. Surface tension of alkaline- earth borates

containing 3 mole percent of potassium oxide,

L. Shartsis, A. B. Bestul, and H. Shermer.

J. Am. Ceram. Soc. 42, 242 (1959). 3060. Systematic research, A. V. Astin. Ordnance 43, No. 233, 741 ( 1959). 3061. Tables of the speed of sound in water, M.

Greenspan and C. E. Tschiegg. J. Acoust.

Soc. Am. 31, No. 1, 75 (1959). 3062. Temperature dependence of the break- down field of barium titanate, P. H. Fang and W. S. Brower. Phys. Rev. 113, 456 (1959). 3063. Testing and operation of ball bearings submerged in liquefied gases, K. B. Martin and R. B. Jacobs. Proc. 1958 Cryogenic

Engineering Conference, Paper H-2, p. 476. Edited by K. D. Timmerhaus, Chemical

Engineering Dept. , University of Colorado

(Boulder, Colorado) (1959); ASLE Trans. 2, No. 1, 101 (1959).

3064. The ampere, F. B. Silsbee. Proc. IRE

47, No. 5, 643 (1959). 3065. The ASTM crude natural rubber sub- committee, N. Bekkedahl and R. G. Seaman. Rubber World 189, 693 (1959). 3066. The basis of our measuring system, A.

G. McNish. Proc. IRE 47, No. 5, 636 (1959). 3067. The calculation of the field in a homogeneous conductor with a wavy interface, J. R. Wait. Proc. IRE 47, No. 6, 1155 (1959). 3068. The day-to-day coordination of IGY observations, A. H. Shapley. Proc. IRE 47, 323

(1959). 3069. The design of impact- resisting fabric structures, J. C. Smith and H. F. Schiefer. Chapter 13 on Textile Engineering, Encyclopedia

of Man-Made Textiles (Textile Book Publishers,

Division of Interscience Publishers, New York,

N. Y. ) (1959). 3070. The diode reactance modulator, G. F. Montgomery. Elec. Eng. 77, 615 (1958); AIEE

Trans, on Commun. and Electronics 78, No. 40, 980 (1959). 3071. The earth and its environment, S. Chap- man. Proc. IRE 47, No. 2, 137 (1959). 3072. The effect of a ceramic coating on the creep behavior of some high temperature

alloys, J. R. Cuthill, J. C. Richmond, and

N. J. Tighe. Bull. Am. Ceram. Soc. 39, 4

(1959). 3073. The effect of multipath distortion on the choice of operating frequencies for high-frequen- cy communication circuits, D. K. Bailey. IRE

Trans. Ant. Prop. AP-7, No. 4, 397 (1959). 3074. The effect of sporadic E on VHF trans- mission in North America, R. M. Davis, E. K. Smith, and C. D. Ellyett. IRE Spec. Govt. Issue 47, No. 5, 762 (1959). 3075. The effect of the earth's magnetic field on m. u. f. calculations, K. Davies. J. Atmospheric and Terrest. Phys. 16, 187 (1959). 3076. The electromotive force method of deter- mining ionization constants: Ionization of bi- sulfate ion, W. J. Hamer. Chapter in the Book

The Structure of Electrolytic Solutions (J. Wiley and Sons, Inc., New York, N. Y. ) p. 236 (1959). 3077. The emission of He I X 10830, during the great flare of August 26, 1958, E. TandbergHanssen, W. Curtis, and K. Watson. Astrophys. J. 129, No. 1, 238 (1959). 3078. The evaluation of small color differences:

I. Visual observations, J. C. Richmond and W.

N. Harrison. Bull. Am. Ceram. Soc. 38, 292

(1959). 3078A. The evolution of certified reference

materials, J. I. Hoffman. Anal. Chem. 31, No. 12, 1934 (1959). 3079. The heat capacity of sulfur from 25° to 250°, the heats and temperatures of transition and fusion, E. D. West. J. Am. Chem. Soc.

81, 29 (1959). 3080. The inner solar corona during June 1959, G. A. Newkirk, G. W. Curtis, D. K. Watson,

R. Manning, and J. Shelby. Nature 184, 1308

(1959). 3081. The internal energy of highly ionized

gases, J. Hilsenrath, M. S. Green, and C. W.

Beckett. IXth Intern. Astronautical Congr. Proc. Amsterdam, Holland, 1958. Springer Verlag (Vienna, Austria) p. 120 (1959).

159
3082. The magnetic interaction of H3

, V.

Griffing, J. L. Jackson, and B. J. Ransil.

J. Chem. Phys. 30, 1066 (1959). 3083. The melting of crystalline polymers, L. Mandelkern. Rubber Chem. and Technol. XXXII, No. 5, 1392 (1959). 3084. The night airglow, F. E. Roach. Proc. IRE 47, 267 (1959). 3085. The nova outburst. I. The nova outburst;

II. The radiative cooling of an expanding shell,

S. R. Pottasch. III. The ionization of hydrogen

gas by an exciting star, J. Jefferies and S. R. Pottasch. IV. The intensity of Ha ; and V. The

temperature and radius of the central exciting

star and observation of elements other than hydrogen, S. R. Pottasch. Ann. Astrophys.

J. 22, 297, 310, 318, 394, and 412 (1959). 3086. The origin of the current nomenclature for

the ionospheric layers, R. Silber stein. J. Atmospheric and Terrest. Phys. 13, 382 (1959). 3087. The peek-a-boo system, W. A. Wildhack

and J. Stern. Chapter 6, Punched Cards, p. 125 (Reinhold Publ. Co. , New York, N. Y. ) (1959). 3088. The plasma jet as a spectroscopic source,

J. Margoshes and B. F. Scribner. Spectro- chim Acta XIV, No. 2, 138 (1959). 3089. The power output of a sound source in a

reflecting environment, R. V. Waterhouse.

Dissertation (Catholic University of America,

Washington, D. C. ) (1959). 3090. The present experimental status of rareearth spectra, W. F. Meggers. Opt. i Spekt 6, 429 (1959). 3091. The riometer--a device for the continuous measurement of ionospheric absorption, C. G.

Little and H. Leinbach. Proc. IRE 47, No. 2, 315 (1959). 3092. The spectral emittance of uncoated and

ceramic-coated Inconel and type 321 stainless

steel, J. C. Richmond and J. E. Stewart. NASA Memo 4-9-59W (1959). 3093. The stability of austenitic stainless steels

at low temperatures as determined by magnetic measurements, R. P. Reed and R. P. Mikesell. Proc. 1958 Cryogenic Engineering Conference, Paper B-2, p. 84, Edited by K. D. Timmerhaus,

Chemical Engineering Dept. , University of Colorado (Boulder, Colorado) (1959). 3094. The system magnesium oxide- germanium

dioxide, C. R. Robbins and E. M. Levin. Am.

J. Sci. 257, 63 (1959). 3095. The tensile and impact strength of annealed and welded 5086 aluminum down to 20° K, R. P. Mikesell and R. P. Reed. Proc.

1958 Cryogenic Engineering Conference, Paper

B-3, p. 101. Edited by K. D. Timmerhaus,

Chemical Engineering Dept. , University of Colorado (Boulder, Colorado) (1959). 3096. The theory of extreme values, J. Mandel. ASTM Bull. No. 236, 29 (1959); Tech. Eng. News 40, No. 7, 28 (1959). 3097. The very low-frequency emissions

generated in the earth's exosphere, R. M.

Gallet. Proc. IRE 47, 211 (1959). 3098. The weighted compounding of two in- dependent significance tests, M. Zelen and L.

S. Joel. Ann. Math. Stat. 30, No. 4, 885 (1959).

3099. Thermal decomposition of poly(vinyl

chloride), R. R. Stromberg , S. Straus, and B.

G. Achhammer. J. Polymer Sci. 35, No. 129, 355 (1959). 3100. Thermal degradation of polyethylene oxide and polypropylene oxide, S. L. Madorsky and S. Straus. J. Polymer Sci. 36, 183 (1959). 3100A. Unas signed. 3101. Total photoelectric cross sections of copper, molybdenum, silver, tantalum, and

gold at 662 kev, W. F. Titus. Phys. Rev.

115, No. 2, 351 (1959). 3102. Transmission of power in radio propagation, J. R. Wait. Elec. and Radio Engr. 36, No. 4, 146 (1959). 3103. Trucks and. trailers, C. W. Phillips. Vol.

1, Chapter 32, Am. Soc. Refrig. Engrs. , Data

Book, p. 32 (1959). 3104. Turbulent motion, G. B. Schubauer and C. M. Tchen. Section B. Vol. V, Princeton

Series, High Speed Aerodynamics and Jet Propulsion, "Turbulent Flows and Heat Transfer",

p. 75 (Princeton University Press, Princeton,

N. J.) (1959). 3105. U2J5 fission product decay spectra at various times after fission, A. Nelms and J. Cooper. Health Physics 1, 427 (1959). 3106. Un nouveau critere d'univalence des transformations dans un Rn, A. M. Ostrowski. Compt. Rend. Acad. Sci. 248. 348 (1959). 3107. Use of a direct current amplifier and recorder to balance a Mueller resistance bridge,

G. T. Armstrong, P. K. Wong, and L. A.

Krieger. Rev. Sci. Instr. 30, 339 (1959). 3108. Unassigned.

3109. Value of the Rydberg constant, W. C. Martin. Phys. Rev. 116, No. 3, 654 (1959). 3110. Variations of surface tension with body

and surface concentrations, A. B. Bestul. J. Am. Ceram. Soc. 42, 236 (1959). 3111. Volcanoes on the moon, M. W. Windsor.

Nature 184, 1556 (1959). 3112. Weighted restricted partitions, M. Newman.

Acta Arith. V, 371 (1959). 3113. Wide- range cryostat temperature control, R. D. Goodwin. Proc. 1958 Cryogenic Engineering Conference, Paper H-3,p. 487. Edited by

K. D. Timmerhaus, Chemical Engineering

Dept., University of Colorado (Boulder, Colorado) (1959). 3114. Young's modulus of various refractory materials as a function of temperature, J. B. Wachtman, Jr. , and D. G. Lam, Jr. J. Am.

Ceram. Soc. 42, 254 (1959). 3115. Zeeman-split absorption lines as very narrow pass filters, K. G. Kessler and W. G. Schweitzer, Jr. J. Opt. Soc. Am. 49, 199 (1959).

16(1
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Errata to Accompany National Bureau of Standards Miscellaneous Publication 240, Publications

of the NBS, July 1, 1957 to June 30, I960 HOW TO USE AUTHOR AND SUBJECT INDEXES

(Beginning on page 167)

National Bureau of Standards publications are identified in the author and subject indexes by the series designation for

papers published by the NBS (pages 11-72) and by assigned number

for papers published in outside journals (pages 73-160). The following tables will assist in locating publication listings referred to in the indexes

NBS

! Non-Periodical Series

index

Symbol

Page

Listing

Circulars

Monographs

Handbooks Miscellaneous

Publications

Building Materials

and Structures Reports

Applied Mathematics

Series

Technical Notes

CMono

H

MBMS

AMS TN

55

5961

6263

6465 NBS Journal of Research

Index Symbol Issue Date

Page

Listing

Vol. I Sect. | No. !

Section AJ

Section B-s

J63 i J63 ! $ I j64 \ j64 ; J63 I J63

J64 ! j64

I J63 ! Section CV^I

U J64

rjj65 kg

Section Bi |JgJ

j64

U J64

D

DD

D

DD

July-August 1959 34

' September-October 1959 35 November-December 1959 36 January-February I960 37 March-April i960 ^9

May -June i960 j 40 July-September 1959 ! 40 October-December 1959 I 4l January-March i960 j 42 April-June i960 j 43 July-September 1959 I 43 October-December 1959 j 44 January-March i960 \ 45 April-June i960 j 47 July-August 1959 I k8 September-October 1959 I 49 November-December 1959 \ 50 January-February i960 | 51 March-April i960 j 53 May-June i960 \ 54
- 2 -

Periodical

Index Symbol Issue Date

Page

Listing

Research

Papers* RP July 1957 to June 1959 11

*This numbering series for Journal of Research papers was discontinued when the four-section Journal was established

in July 1959.

Papers in Outside Journals Author -index citations to papers published in outside

journals (non-NBS) give the journal designation followed by

the assigned number corresponding to the paper listing be- ginning on page 75. Subjects-index citations to outside

papers are designated by the assigned number only (page 75).

May 22, 1961

USComm-NBS-BO
6. AUTHORS INDEX

A

Abbott, R., Bean, B. R., Oxygen and water vapor absorption of radio waves in the atmosphere. Geofis. pura

e appl. (Milan, Italy) 37, 127 (1957). 2241. Aboud, A. A., Powell, R. L., Electrical contact resist- ance of copper, copper functions at low temperatures. Rev. Sci. Instr. 29, 248 (1958). 2537. Abramowitz, M., Coulomb wave functions expressed in terms of Bessel-Cliff->rd and Bessel functions. J. Math, and Phys. 29, 303 (1951). 214. Evaluation of the integral e-^-^'^du. J. Math.

Jo and Phys. 32, 188 (1953). 716. Heat transfer in laminar flow. Abstracts of Short Communications and Scientific Programme, Internat- ional Congress of Mathematicians (Edinburgh, Scotland) p. 135 (1958). 2579. Integral equations. Handbook of Phvsics, Edited bv

E. U. Condon and H. Odishaw, Chapter 6, Pt. 1, p. 1-90 (McGraw-Hill Book Co., Inc., New York, N.Y.) (1958). 2500. On the practical evaluation of integrals. J. Soc. Indust. Appl. Math. 2, 20 (1954). 1098. On the solution of the differential equation occuring

in the problem of heat convection in laminar flow through a tube. J. Math, and Phys. 32, 184 (1953).

789. Regular and irregular Coulomb wave functions ex- pressed in terms of Bessel-Clifford functions. J. Math, and Phys. 33, 111 (1954). 1127. Table of the integral, J*

e~'3 du. J. Math, and Phys.

30, No. 3, 162 (1951). 320. Tables of integrals of Struve functions. J. Math, and

Phys. 29, 49 (1950). 146. Abramowitz, M., Antosiewicz, H. A., A representation

for solutions of analytic systems of linear differential equations. J. Wash. Acad. Sci. 44, No. 12, 382

(1954). 932. Coulomb wave functions in the transition region. Phys. Rev. 96, No. 1, 75 (1954). 980. Abramowitz, M., Cahill, W. F'., On the vibration of a square clamped plate. J. Assoc. Computing Machinery 2, No. 3, 162 (1955). 1435. Abramowitz, M., Cahill, W. F., Wade, C, Jr., Heat transfer in laminar flow through a tube. J 62, 101 (1959) RP2937.

Abramowitz, M., Rabinowitz, P., Evaluation of coulomb wave functions along the transition line. Phvs Rev.

96, No. 1, 77 (1954;. 1018. Abramowitz, M., Stegun, I. A., Generation of Bessel functions on high speed computers. Math. Tables and Other Aids to Computation 11, 255 (1957). 2140.

Pitfalls in computation. J. Soc. Indust. Appl. Math.

4, 207 (1956). 1809. The generation of Coulomb wave functions by means

of recurrence relations. Phys. Rev. 98, 185 1~ (1955;. 1532. Achenbach, P. R., Radiant glass heating panels. Heating and Ventilating 50, 83(1953). 806. What is the heat pump? Parents Mag. 29, 56 (1954). Achenbach, P. R., Coblentz, C. PP., Design and perfor- mance of a portable infiltration meter. Heating,

Piping, Air Conditioning 29, No. 7, 155 (1957); Trans.

Am. Soc. Heating and Air Conditioning Engrs., Paper

477 (1957). 2082. Achenbach, P. R., Johnson, H. D., Winter, J. C, Phillips,

C. W., Grimes, J. W., Heat transfer measurements

on refrigerated-food trailers. U.S. Dept. of Agriculture, Agricultural Marketing Service (AMS-250),

(June, 1958). 2580. Achenbach, P. R., Phillips, C. W., Water demand rates

for electric drinking-water coolers of the bubbler

type. Refrig. Eng. 62, No. 12, 37 (1954). 1226. Acherman, W. L., Lining, F. J., Peterson, J. M., Edwards,

D. M., Chemical analysis of GR-S by complete

solution procedures. Gross constituents in GR-S

containing soap. Anal. Chem. 25, 1511 (1953). 666. Achhammer, B. G., Polymer degradation studies by

absorption and mass spectrometry. Anal. Chem.

24, No. 12, 1925. (1952) 515. Achhammer, B. G., Bersch, C. F., Stromberg, R. R., Structural changes in irradiated plastics films. SPE Tech. Paper 5, 5 (1959). 3056. Achhammer, B. G., Harvey, M. R., Bersch, C. F., Heat

and ultraviolet aging of poly(vinyl chloride). J 60, 481 (1958) RP2863. Achhammer, B. G., Newman, S. B., Toner, S. D., Surface

erosion of filled plastics. Modern Plastics 36, 135

(1958). 2792. Achhammer, B. G., Reiney, M. J., Wall, L. A., Reinhart,

F. W., Study of degradation of polystrene by means

of mass spectrometry. J. Polymer Sci. 8, No. 5, 555 (1952). 557. Achhammer, B. G., Stromberg, R. R., Straus, S., Thermal

decomposition of poly (vinyl chloride). J. Polymer

Sci. 35, No. 129, 355 (1959). 3099. Infrared spectra of thermally degraded poly (vinyl- chloride). J 60, 147 (1958) RP2832.

Achhammer, B. G., Tryon, M., Kline, G. M., Chemical

structure and stability relationships in polymers.

Kunststoffe combined with German Plastics Digest

49, No. 11, 600 (1959); Modern Plastics 37, No. 4, 131 (1959). 2910.

Acquista, N., Caul, H. J., Wall, L. A., Determination

of the monomer content of polvmethyl methacrylate. J. Am. Dental Assoc. 53, 56 (1956). 1673.

Acquista, N., Mann, D. E., hide, D. R., Jr., The infrared spectrum of tertiary butyl fluoride. J. Mol. Spectroscopy 2, 575 (1958). 2820.

Acquista, N., Mann, D. E., Plyler, E. K., The vibrational spectrum of bromotrifluoroethylene. J. Chem.

Phys. 22, 1199 (1954). 1206. The vibrational spectrum of chlorotrifluoroethylene.

J. Chem. Phys. 21, 1949 (1953). 893. Vibrational spectra of trifluoroethvlene and trifluoro- ethylene-d. J. Chem. Phys. 22, 1586 (1954). 1224.

Acquista^ N., Plyler, E. K., Infrared absorption of

liquid water from 2 to 42 microns. J. Opt. Soc. Am.

44, 505 (1954). 1038. Infrared measurements with a cesium iodide prism.

J. Opt. Soc. Am. 43, 977 (1953). 742. Infrared spectrometry with a cesium iodide prism.

J. Opt. Soc. Am. 43, 212 (1953). 744. Small grating spectrometer for the far infrared region.

J. Chem. Phys. 23, 752 (1955). 1488. The use of cesium iodide prisms to 50 microns. N.

3 del Supplemento al Vol. 2, Serie x, II Nuovo

Cimento, p. 629 (Bologna, Italy) (1955). 1551. Transmittance and reflectance of cesium iodide in the far infrared region. J. Opt. Soc. Am. 48, No. 9, 668 (1958). 2852. 167
Acquista, N., Plyler, E. K., Mann, D. E., Vibrational spectrum of 1-fluoro-l-chloroethvlene. J. Chem. Phvs.

23, 2122 (1955). 1576. Acton, F. S., Analyzing straight-line data. J. Chem.

Education 30, 128 (1953). 652. Adachi, S., Impedance characteristics of a uniform

current loop having a spherical core. J 64D3. 295

(1960). Adams, L. H., Waxier, R. M., Temperature-induced

stresses in solids of elementary shape. (1960) Mono. 2. Adelman, D. M., Mong, L. E, Control of factors affect- ing the reproducibility of mechanical properties of refractory semi-dry press specimens. J. Am. Ceram.

Soc. 41, No. 7, 267 (1958). 2501. Adelson, E., Rothman, S., Schwebel, A., Langdell, R. D., Adsorption of C14 dextran to human blood platelets and red blood cells in vitro. Vox Sanguinix 2, 104

(1957). 2011.

Adler, A. (?., Taylor, D. F., Leibfritz, W. A., Physical

properties of chromium cobalt alloys. J. Am. Dental

Assoc. 56. 343 (1958). 2687. Agmon, S., The relaxation method for linear inequalities. Can. J. Math. 6, 382 (1954). 1196 Agmon, S., Bers, L., The expansion theorem for pseudoanalytic functions. Proc. Am. Math. Soc. 3, No. 5, 757 "(1952). 577. Agranoff, B., Seliger, H. H., Improvements in liquid

scintillators. Anal. Chem. 31, No. 9, 1607 (1959). 2964. Agy, V., Geographic and temporal distribution of polar

blackouts. J. Geophys. Research 59, 499 (1954). 1024. Ionospheric effects produced by solar flare radiation. Phys. Rev. 102, 917 (1956). 1750. Location of the auroral absorption zone. J. Geophys.

Research 59, 267 (1954). 1054. Motion of the storm-D region. Nature 173, 445

(1954). 1078. Polar blackout occurence patterns. J. Atmospheric and Terres. Phys. Special Suppl. 1957, Proc. of the Polar Atmosphere Symp. (Oslo, Norway) July 2-8

1956, Pt. II, 129 (1957). 2256. Results of ionospheric drift measurements in the United States. J. Atmospheric and Terrest. Phys.

Special Suppl. 1957, Proc. of the Polar Atmosphere Svmp. (Oslo, Norway) July 2-8, 1956, Pt. II, 23

(1957). 2288. Agy, V., Davies, K., Ionospheric investigations using the sweep-frequencv pulse technique at oblique incidence.

J 63D2, 151 (1959). Agy, V., Davies, K., Salaman, R., An atlas of oblique- incidence ionograms. (1959) TN31 (PB151390).

Alber, H. K., Macurdy, L. B., Benedetti-Pichler, A. A.

Carmichael, H., Corwin, A. H., Fowler, R. M., Huff- man, E. W. D., Kirk, P. L., Lashof, T. W., Terminol- ogy for describing the performance of analytical and

other precise balances. Anal. Chem. 26, 1190 (1954). 1166.

Albers, J. R., Fano, U., McVoy, K. W., Interference of orbital and spin currents on bremsstrahlung and

photoelectric effect. Phys. Rev. 116, No. 5, 1159

(1959). 2968. Sauter theorv of the photoelectric effect. Phys. Rev.

116, No. 5, 1147 (1959). 3040.

Albert, A. L., Miller, J. A., Mechanical tests on specimens from large aluminum-alloy forgineis. Natl. Advisory Comm. Aeronaut. Tech. Note 3729 (1956). 1772.

Albrite, J. P., Shutts, R. E., Whitlock, M. B., Jr., Cook,

R. K., Corliss, E. L. R., Burkhard, M. D. Research

in normal threshold of hearing. A.M. A. Arch.

Otolaryngol. 68, 194 (1958). 2735.

Aldrich, R., Marvin, R. S., Sack, H. S., The dynamic

bulk viscosity of polyisobutylene. J. Appl. Phys.

25, No. 10, 1213 (1954). 1182. Alexander, R. L., Jr., The syntheses and infrared absorption spectra of some ra-polyphenyls. J. Organic Chem. 21, 1464 (1956). 1951.' Alexander, R. L., Jr., Hellmann, M., Coyle, C. F., Separation of isomeric polyphenyls by adsorption chro- matography. Anal. Chem. 30, 1206 (1958). 2752. 168

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Mandelkern, L., Martin, G. M., Rogers, S. S., Volume

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Science 127, 1052 (1958). 2616. Mann, C, Kanagy, J. R., Leser, W., Randall, E. B.,

Carter, T. J., Influence of splitting on the strength

of chrome-tanned steer hides. J. Am. Leather Chemists Assoc. 47, 329 (1952). 468. 234

Mann,, C, Kanagy, J. R., Mandel, J., Study of the

variation of the physical and chemical properties of chrome-tanned leather and the selection of a sampling

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properties within and between vegetable retanned cow and steer sides. J. Am. Leather Chemists

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, chemical properties of split and unsplit chrometanned leathers. J. Am. Leather Chemists Assoc.

47, 404 (1952). 601. Mann, C, Randall, E. B., Kanagy, J. R., Mandel, J., Study of the burst test as applied to military upper

leathers. J. Am. Leather Chemists Assoc. 48, 84

(1953). 842. Mann, D. B., Birmingham, B. W., United States plan- ning for the large scale liquefaction and transportation

of helium. Physica 24, S144 (1958). 2855A. Mann, D. B., Birmingham, B. W., Vander Arend, P. C,

Technical aspects of large scale liquid helium lique- faction and transportation. Proc. 1957 Cryogenic

Engineering Conference, Paper D-4, p. 191, Edited by

K. D. Timmerhaus, Chemical Engineering Dept.

University of Colorado (Boulder, Colorado) (1958). 2797. Mann, D. B., Chelton, D. B., Byrns, R. A., A large liquid hydrogen bubble chamber. Proc. 1956 Cryogenic

Engineering Conference, Paper H-2, p. 325, Edited by K. D. Timmerhaus, Chemical Engineering Dept., University of Colorado (Boulder, Colorado) (1957). 1984. Mann, D. B., Chelton, D. B., Dean, J. W., Strobridge,

T. R., Birmingham, B. W., Helium refrigeration and liquefaction using a liquid hydrogen refrigerator

for precooling. (1960) TN39 (PB151398). Mann, D. B., Scott, L. E., Robbins, R. F., Birmingham,

B. W., Temperature stratification in a nonventing

liquid helium dewar. J 64C1, 19 (1960). Mann, D. B., Steward, R. B., Thermodynamic properties of helium at low temperatures and high pressures. (1959) TN8 (PB151367). Mann, D. E., The vibrational spectra of n-dimethylaminodiborane. J. Chem. Phys. 22, 70 (1954). 1205. Mann, D. E., Acquista, N., hide, D. R., Jr., The infra- red spectrum of tertiary butyl fluoride. J. Mol.

Spectroscopy 2, 575 (1958). 2820. Mann, D. E., Acquista, N., Plyler, E. K., The vibrational spectrum of bromotrifluoroethylene. J. Chem.

Phys. 22, 1199 (1954). 1206. The vibrational spectrum of chlorotrifluoroethylene.

J. Chem. Phys. 21, 1949 (1953). 893. Vibrational spectra of trifluorethylene and tri- fluoroethylene-e*. J. Chem. Phys. 22, 1586 (1954). 1224. Mann, D. E., Broida, H. P., Squires, H. P., The de- composition of CF4 in flames. J. Chem. Phys. 22, 348 (1954). 1176. Mann, D. E., Dibeler, V. H., Reese, R. M., Ionization and

dissociation of perchlorylfluoride by electron impact.

J. Chem. Phys. 27, 176 (1957). 2170. Mann, D. E., Fano, L., Vibrational spectrum and force constants of diboron tetrachloride. J. Chem. Phys.

26, 1665 (1957). 2409. Mann, D. E., hide, D. R., Jr., Microwave spectra of molecules exhibiting internal rotation. I. Propylene.

J. Chem. Phys. 27, 868 (1957); II. Methylallene, J. Chem. Phys. 27, 874 (1957). 2202. Microwave spectra of molecules exhibiting internal

rotation, III. Trimethylamine. J. Chem. Phys. 27, 572 (1958). 2637.
Microwave spectra of molecules exhibiting internal

rotation. IV. Isobutyane, tertiary butvl fluoride and

trimethvlphospine. J. Chem. Phys. 29, 914 (1958). 2638. Search for the microwave spectrum of perchlorylfluoride. J. Chem. Phys. 25, 595 (1956). 1863. The infrared spectrum and structure of perchlorvlfluoride. J. Chem. Phys. 25, 1128 (1956). 1933. Mann, D. E., Lide, D. R., Jr., Fristrom, R. M., The

microwave spectrum and structure of sulfuryfiuoride.

J. Chem. Phvs. 25, 734 (1957). 2372. Mann, D. E., Meal, J. H., Plyler, E. K., Properties of

fluorine compounds, the vibrational spectrum of tetrabromoethylene. J. Chem. Phys. 24, No. 5, 1018

(1956). 1825." Vibrational spectrum of tetrabromoethylene. J. Chem. Phys. 24, 1018 (1956). 1973. Mann, D. E., Plyler, E. K., Infrared and raman spectra

of trans-difluorodichloroethylene. J. Chem. Phys.

26, 773 (1957). 2161. The v9 fundamental of C2 F,. J. Chem. Phys. 21, 1116

(1953). 888. Vibrational spectrum of fluorotrichloroethylene. J. Chem. Phys. 23, No. 11, 1989 (1955). 1577. Mann, D. E., Plyler, E. K., Acquista, N., Vibrational spectrum of 1-fluoro-l-chloroethylene. J. Chem. Phys.

23, 2122 (1955). 1576. Mann, H. B., The estimation of parameters in certain stochastic processes. Sankhya (Calcutta, India.) 11, Pt. 2, 97 (1951). 334. Mann, W. B., Preparation and maintenance of radio- active standards by the National Bureau of Standards. Acta Radiol. Suppl. 117, 50 (1955). 1455. Radium standards, internal gas counting and the United States radioactivity standards program.

Proc. Symp. on Measurements and Standards of Radioactivity, Natl. Research Council, Nuclear

Science Series, No. 24, 17 (1958). 2714. The preparation and maintenance of standards of radioactivity. J. Appl. Radiation and Isotopes 1, 3 (1956). 1944. Mann, W. B., Bay, Z., Seliger, H. H., Wyckoff, H. (A, Measurement of W»ir for sulfur-35 betarays. Radiol. Research Abstract 5, No. 4, 9 (1956). 1769. Mann, W. B., Seliger, H. H., Preparation, maintenance, and application of standards of radioactivity. (1958) C594.

Radioactivity standardization in the United States. Proc. 2d Intern. Conf. on the Peaceful Uses of Atomic Energy, United Nations (Geneva, Switzerland) 21, 90 (1958). 2712. Mann, W. B., Seliger, H. H., Cavallo, L. M., Average

energy of sulfur-35 beta decay. J 60, 447 (1958) RP2859. Mann, W. B., Stockmann, L. L., Youden, W. J., Schwebel,

A., Mullen, P. A., Garfinkel, S. B., Preparation

of new solution standards of radium. J 62, 21 (1959) RP2924.

Manning, J. R., Correlation correction to the activation energy for diffusion in crystalline solids. Phys. Rev. Letters 1, No. 10, 501 (1958). 2502. Correlation effect in impurity diffusion. Phys. Rev.

116, No. 4, 819 (1959). 2919. Manning, R., Newkirk, G. A., Curtis, G. W., Watson, D. K.,

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Nigro, J. P., Skramstad, H. K., Ernst, A. A., An analogdigital simulation for the design and improvement of man-machine systems. 1957 Eastern Joint Computer Conf. Proc. (Inst. Radio Engrs., New York, N.Y.) (1958). 2453.

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Shuler, K. E., Montroll, E. W., Application of the theory

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Silverstein, A., Building and using dielectric amplifiers. Electronics 27, 150 (1954). 963. Simha, R., Degradation of high polymers. J. Polymer

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Straus, S., Depolvmerization of polvmethylene and

polyethylene. J. Am. Chem. Soc. 76, 3430 (1954). 985. Simmons, B., Biagi, F., Pressure calibration of condenser microphones above 10,000 cps. J. Acoust. Soc. Am.

26, 693 (1954). 1114. Simpson, B., Kissinger, H. E,, McMurdie, H. F., Ther- mal decomposition of manganous and ferrous car- bonates. J. Am. Ceram. Soc. 39, No. 5, 168 (1956). 1960. Simpson, J. A., Electron interference experiments. Rev. Mod. Phys. 28, No. 3, 254 (1956). 1702. The theory of the three-crystal electron interferometer. Rev. Sci. Instr. 25, No. 11, 1105 (1954). 1202. Simpson, J. A., Klein, R., Production of a square temperature wave in a filament operating at low temperatures. Rev. Sci. Instr. 29, No. 9, 770 (1958). 2701. Simpson, J. A., Leder, L. B., Improved electrical differ- entiation of retarding potential measurements. Rev.

Sci. Instr. 29, No. 7, 571 (1958). 2596. Simpson, J. A., Marlon, L., Electron absorption spec- trometer using an improved velocity analyzer. Rev.

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Conf., Centre Natl, de la Richerche Scientifique

(Paris, France), p. 175 (1955). 1335. Simpson, J. A., Marlon, L., McCraw, T. F., Automatic

instrument for electron scattering measurements.

Rev. Sci. Instr. 26, No. 9, 855 (1955). 1274. Distribution of electron scattering by gold. Phys. Rev. 99, No. 2, 495 (1955). 1317. Simpson, J. A., Marton, L., Suddeth, J. A., An electron interferometer. Rev. Sci. Instr. 24, No. 11, 1099

(1954). 947. Electron beam interferometer. Phys. Rev. 90, 490

(1953). 706. Simpson, J. A., Marton, L., Suddeth, J. A., Wagner, M. D., Watanabe, H., Effect of degree in orientation and

crystal size on the scattering of 20-kev electrons by

aluminum. Phys. Rev. 110, No. 5, 1057 (1958). 2529. Simpson, J. A., McCraw, T. F., Marton, L., Distribution

of electrons scattered bv solids. Phys. Rev. 104, No. 1, 64 (1956). 1681/

Simpson, J. A., Van Bronkhorst, A., Modification of electron microscope for electron optical shadow

method. Rev. Sci. Instr. 21, 669 (1950). 91.

Sisler, F. D., Cloud, P. E., Jr., Friedman, I., Dibeler, V. H., Microbiological fractionation of the hydrogen isotopes. Science 127, 13 (1958). 2635. Skramstad, H. K., Ernst, A. A., Nigro, J. P., An analogdigital simulation for the design and improvement of man-machine systems. 1957 Eastern Joint Computer Conf. Proc. (Inst. Radio Engrs., New York,

N.Y.) (1958). 2453. Skramstad, H. K., Landsman, G. L., Control mechanisms. Handbook of Physics, Edited by E. U. Condon and

H. Odishaw, Chapter 9, Pt. 2, p. 2-69 (McGraw-Hill Book Co., Inc., New York, N.Y.) (1958). 2500. Skramstad, H. K., Wright, J. H., An analog computer

for radioactive fallout prediction. Proc. Natl. Simulation Council (1956). 1616. Slawsky, M. M., Lutsky, M., Schneidlin, A. E., Pressure drop in pneumatic components and systems. Product Eng. Handbook No. 3. Section J, p*. J2 (McGrawHill Book Co., Inc., New York, N.Y.) (1955). 1456.

Slawsky, M. M., Tsai, D. H., Determination and correla- tion of flow capacities of pneumatic components.

(1957) C588.

Slone, M. C, Lamb, J. J., Reinhart, F. W., Properties

of polymethyl alpha-chloroacrylate. Modern Plastics 29, No. 10, 109 (1952). 520.

Slone, M. C, Reinhart, F. W., Measurement of creep

of acrylic glazing plastics exposed to temperature

gradients. SPE J. 10, 29 (1954). 1065. Properties of plastic films. Modern Plastics 31, 203 (1954). 1122.

Slutz, R. J., Atmospheric research, International Geophysical Year. Americana Annual p. 60. (An Encyclopedia of the Events of 1956, Americana Corp., New York, N.Y.) (1957). 2031.

Slutz, R. J., Shapley, A. H., Probing the ionosphere. In American Geophysical Union, Geophysics and

the IGY, Geophysical Monograph No. 2, 45 (1958). 2700. Smith, A. N., Devaney, T. E., Fields in electrically short ground systems. J 63D2, 175 (1959). Smith, C. C. Seliger, H. H., Improvement in response

of 4-ir gamma-ionization chambers. Rev. Sci. Instr. 24, 474 (1953). 735. Smith, D. K., Bibliography on molecular and crystal structure models. (1960) Mono. 14. Smith, D. L., Caul, H. J., Alloys of gallium with powered

metals as possible replacement for dental amalgam.

J. Am. Dental Assoc. 53, 315 (1956). 1613. Smith, D. L., Caul, H. J., Sweeney, W. T., Some physical

properties of gallium copper-tin alloys. J. Am.

Dental Assoc. 53, 677 (1956). 1876. Smith, D. L., Ferguson, G. W., Schoonover, I. C, Microstructure of dental amalgam. J. Am. Dental Assoc.

47, 305 (1953). 765. Smith, D. L., Schoonover, I. C, Direct filling resins: dimensional changes resulting from polymerization

shrinkage and water sorption. J. Am. Dental Assoc.

46, 540 (1953). 689. Smith, E. E., Wyckoff, H. 0., Aston, G. H., A comparison

of X-ray standards. British J. Radiol. 27, No. 318, 325 (1954). 916. Smith, E. K., Bureau of Standards comments on Loran

communications. IRE Trans. Aeronaut. Navigational Elec. ANE-4, 84, (1957). 2039. Sporadic E observed on VHF oblique incidence

circuits, North Atlantic Treaty Organization. Sporadic E ionization; Ionospheric Research Meeting, AGARD Avionics Panel, September 1958, (Cambridge, England), AGARDograph 34, p. 129 (1958). 2773. The effect of sporadic-E on television reception. IRE Trans. Ant. Prop. AP-2, 54 (1952). 574; J. Radio-Electronics 24, No. 6, 54 (1953). 859. Smith, E. K., Bateman, R., Finney, J. W., Tveten, L. H., Watts, J. M., IGY observations of F-layer scatter in the far east. J. Geophys. Research 64, 403 (1959). 2963. Smith, E. K., Davis, R. M., Ellyett, C. D., The effect of sporadic E on VHF transmission in North America. IRE Spec. Govt. Issue 47, No. 5, 762 (1959). 3074. Smith, E. K. Finney, J. W., Report on the IGY oblique- incidence sporadic-!? and F-scatter program. (1960) TN48 (PB151407).

Smith, E. K., Knecht, R. W., Some implications of slant- Es. J. Atmospheric and Terrest. Phys. Spec. Suppl.

1957, Proc. Polar Atmospheric Symp. July 1956

(Oslo, Norway), Pt. II, 195 (1957). 2304. Smith, E. K., Thomas, J. A., A survey of the present knowledge of sporadic-E ionization. J. Atmospheric and Terrest. Phys. 13, 295 (1959). 2885. Smith, E. K., Weintraub, S., The constants in the equation for atmospheric refractive index at radio fre- quencies. Proc. IRE 41, 1035 (1953). 855. Smith, E. R., Edelman, S., Brooks, R., Saito, S., Jones, E., A stroboscopic vibration analyzer. J 63C2, 97

(1959). 268
Smith, E. R., Edelman, S., Jones, E., Some developments

in vibration measurement. J. Acoust. Soc. Am.

27, 728 (1955). 1492. Smith, E. R., Edelman, S., Jones, E., Schmidt, V. A., Stroboscopie interferometer for vibration measurement. J. Acoust. Soc. Am. 30, 867 (1958). 2784. Smith, E. R., Sulzer, P. G., Edelman, S., High-speed

stroboscope for accelerometer calibration. Rev. Sci. Instr. 25, No. 8, 837 (1954). 1031. Smith, F. A., Isbell, H. S., Creitz, E. C, Frush, H. L., Moyer, J. D., Stewart, J. E., Infrared spectra of sugar acetates in solution. J 59, 41 (1957) RP2772.

Smith, "F. C, Howard, D. M., Fatigue and static tents of

flush riveted joints. Product Eng. Handbook No. 3, Section G. p. G2 (McGraw-Hill Book Co., Inc., New

York, N.Y.) (1955). 1345. Smith, F. C, Smith, I., Howard, D. M., Cumulative

fatigue damage of axiallv loaded Alclad 75S-T6 and

Alclad 24S-T3 aluminum-allov sheet. Natl. Advisory Comm. Aeronaut. Tech. Note 3923 (1955). 1303. Smith, I., Howard, D. M., Smith, F. C, Cumulative

fatigue damage of axially loaded Alclad 75S-T6 and

Alclad 24S-T3 aluminum-alloy sheet. Natl. Advisory Comm. Aeronaut. Tech. Note 3932 (1955). 1303. Smith, J., Wildhack, W. A., Stern, J., Documentation in instrumentation. Studies in Coordinate Indexing

Vol. Ill, Documentation, Inc. (1956). 1682. Smith, J. C, Rapid impact loading of textile yarns. Proc. Symp. on High-Speed Testing, Plas-Tech. Equipment Corp. (Interscience Publ. Inc., New York,

N.Y.) (1958). 2715. Smith, J. C, McCrackin, F. L., Schiefer, H. F., Characterization of the high-speed impact behavior of textile yarns. (Conf. Issue) J. Textile Inst. (Trans.) 50, No. 1, T55 (1959). 2909.

Stress-strain relationships in yarns subjected to rapid impact loading. III. Effect of wave propagation.

Textile Research J. 25, No. 8, 701 (1955). 1516.

Stress-strain relationships in yarns subjected to rapid impact loading: 5. Wave propagation in long textile yarns impacted transversely. J 60, 517 (1958) RP2866; Textile Research J. 28, No. 4, 288 (1958). 2783. The impact absorbing capacity of textile yarns. ASTM

Bull. No. 220, 52 (1957). 2363. Smiih, J. C, McCrackin, F. L., Schiefer, H. F., Stone, W. K., Breaking velocities, strain energies, and the- ory neglecting wave propagation. Pt. II. Textile Research J. 25, 529 (1955). 1277. Smith, J. C, Schiefer, H. F., The design of impactresisting fabric structures. Chapter 13 on Textile Engineering, Encyclopedia of Man-Made Textiles

(Textile Book Pubis., Division of Interscience Pubis., New York, N.Y.) (1959). 3069. Smith, J. C, Schiefer, H. F., McCrackin, F. L., Stone, W. K., Stress-strain relationships in yarns subjected

to rapid impact loading. Am. Soc. Testing Materials

Spec. Tech. Publ. 176, "Symposium on Impact Testing", 126 (1955). 1514.

Stress-strain relationships in yarns subjected to rapid impact loading. Am. Soc. Testing Materials Spec. Tech. Publ. 185, Symp. on Testing on Non-Metallic

Materials, p. 47 (1956)1899.

Smith, J. C, Schiefer, H. F McCrackin, F. L., Stone, W. K., Towne, K. M., Stress-strain relationship in yarns tested at rates of straining up to a million per- cent per minute. Physics of Wool and Other Viscoelastic Fibers, D, 148 (1956) (Proc. Intern. Wool

Textiles Research Conf., August 20-25, 1955, Sydney,

Australia) (1956). 1900. Smith, J. L., Leiner, A. L., Notz, W. A., Weinberger, A., Organizing a network of computers to meet deadlines. 1957 Eastern Joint Computer Conf. Proc. (Washington,

D.C.) p. 115 (1957). 2240. PILOT, a new multiple computer system. J. Assoc. Computing Mach. 6, No. 3, 313 (1959). 3016. PILOT, the NBS multicomputer system. Proc.

Eastern Joint Computer Conf. (Philadelphia, Pa.) n

164 (1958). 2692. V

' ' V

Smith, J. L., Weinberger, A., A logic for high-speed

addition. (1958) C591, Sect. 1. A one-microsecond adder using one-megacycle cir- cuitry. IRE Trans. Electronic ( 'omputers EC-5, No

2, 65 (1956). 1596. Shortcut multiplication for binary digital comnuters

(1958) C591, Sect. 1. The logical design of a one-microsecond parallel adder

using one-megacycle circuitry. Am. Inst. Elec. Engrs. Proc. Western Joint Computer Conf. T-85

(1956). 1937. Smith, N., Color television. Sci. Am. 183, No. 6, 13

(1950). 38. Influence of the sun upon the ionosphere. (Part of a Conference on the sun in the service of man.)

Proc. Am. Acad. Arts 79, 181 (1951). 250. Smith, N., Condon, E. U., Bailey, S. L., Everilt, W. L., Fink, D. G., The present status of color television; a report by the Senate Advisory Committee on Color

Television. Proc. IRE 38, 980 (1950). 154. Smith, R. G., Leaderman, H., Jones, R. W., Rheology of polyisobutylene. II. Low molecular weight poly- mers. J. Polymer Sci. 14, 47 (1954). 1132. Smith, R. G., Leaderman, H., Williams, L. C, Rheology

of polyisobutylene. III. Elastic recovery, non-Newtonian flow, and molecular weight distribution. J. Polymer Sci. 36, 233 (1959). 3037. Smith, R. O., Wildhack, W. A., A basic method of determining the dynamic characteristics of accelerometers by rotation. J. Instr. Soc. Am. 1, No. 12, Paper No. 54 (1954). 913. Smith, R. W., The federal basis for weights and measures.

(1958) C593.

Smith, S. J., Branscomb, L. M., Electron affinity of atomic oxygen. Phys. Rev. 98, No. 4, 1127 (1955). 1334. Electron affinity of atomic sulfur and empirical

affinities of the light elements. J. Chem. Phys. 25, No. 3, 598 (1956). 1698. Experimental cross section for photodetachment of electrons from H-and D-. Phys. Rev. 98, No. 4, 1028 (1955). 1338. Negative oxygen ions in the upper atmosphere: the

affinity and radiative attachment coefficient of atomic

oxygen. Trans. Am. Geophys. Union 36, 5, 755

(1955). 1413. Smith, S. J., Branscomb, L. M., Burch, D. S., Geltman, S., Photodetachment cross section and the electron affin- ity of atomic oxygen. Phys. Rev. Ill, No. 2, 504

(1958). 2683. Photodetachment studies of negative ions. Third

Intern. Conf. on Ionization Phenomena in Gases,

Societa Italiana di Fiscia. (Venice, Italy) (1957). 2246. Smith, S. J., Burch, D. S., Photodetachment cross section

of the negative hydrogen ion. Phys. Rev. Letters 2, No. 4, 1645 (1959). 3012. Relative measurement of the photodetachment cross section for H-. Phys. Rev. 116, No. 5, 1125 (1959). 3035. Smith, S. J., Burch, D. S., Branscomb, L. M., Experi- mental photodetachment cross section and the iono- spheric detachment rate for Oj. Ann. Geophys. Tome 14, No. 2, 225 (1958). 2556. Photodetachment of 02_. Phys. Rev. 112, 171 (1958). 2684. Smith, S. W., Protection in the use of dental roentgeno- graph^ equipment. J. Am. Dental Assoc. 51, 12

(1955). 1462. Smith, S. W., Amory, H. I., Military field X-ray equip- ment. Radiology 59, No. 6, 879 (1952). 483. Smith, S. W., Kennedy, R. J., Dose to walls in radio- graphic rooms. Radiology 64, 114A (1955). 1319. Smith, S. W., Nelsen, R. J., Dangers of radiation. J. Am. Dental Assoc. 50, No. 5, 581 (1955). 1305. 269
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Precise coulometric titrations. Science 124, 3228

(1956). 1815. Precise coulometric titration of acids and bases. J 63A2, 153 (1959). Smith, W. H., Multipurpose standard for microchemical

analysis. Anal. Chem. 30, 149 (1958). 2641. Snoke, H. R., Asphalt research at the National Bureau of Standards. ASTM Bull. No. 220, p. 41 (1957). 2029. Research on roofings. Building Research Advisory Board Conf. Report, Research Corporation Conf.

(Building Research Advisory Board, Div. of Engr. and Ind. Natl. Research Council, Washington,

D. C.)(1950). 129. Snoke, H. R., Kleinschmidt, L. R., Changes in the

properties of an asphalt during the blowing operation. J 60, 169 (1958) RP2835.

Effect of light and water on the degradation of asphalt. J 63C1, 31 (1959). Snyder, C. F., Report on sugars and sugar products. J. Assoc. Offic. Agri. Chemists 39, 676 (1956). 1852.. Snyder, C. F., Swindells, J. F., Hardy, R. C, Golden, P. E., Viscosities of sucrose solutions at various temperatures: tables of recalculated values. (1958) C440

Suppl.

Snyder, W. F., Corliss, E. L. R., Calibration of audiometers.

J. Acoust. Soc. Am. 22, 837 (1950). 31. Sokolowsky, £>., Gaddum, J. W., Hoffman, A. J., On

the solution of the caterer problem. Logistics Research Quart. 1, 223 (1954). 1099. Sokolowsky, D., Hoffman, A. J., Mannos, M., Wiegmann,

N. A., Computational experience in solving linear programs. J. Soc. Ind. Appl. Math. 1, 17 (1953). 672. Solow, M., Greene, F. M., Development of VHF field- intensity standards. Proc. IRE 40, No. 5, 573 (1952). 427.

Soller, W., Malloy, A., Roberts, A. G., Evaluation of adhesion of organic coatings by ultracentrifugal and

other methods. Paint, Oil, and Chem. Rev. 116, No. 18, 14; 116, No. 19, 26 (1953). 715. Sommer, H., Craig, S. N., Hoffman, J. I., Hippie, J. A., The effect of recent mass measurements on the Faraday. Phys. Rev. 85, 740 (1952). 573. Sommer, H., Hippie, J. A., A combination crossedfield and time-of-flight mass spectrometer. Phys. Rev. 85, 714 (1952). 360. A new method for the measurement of the isotopic abundance of solids. Phys. Rev. 83, 229 (1951).

180. Sorrows, H. E., Ryan, W. E., Ellenwood, R. C, Evaluation

of coaxial slotted-line impedance measurements.

Proc. IRE 39, 162 (1951). 234. Soudsr, W., Paffenbarger, G. C, American Dental

Association contribution to dental science: physical

research. J. Am. Dental Assoc. 58, 97 (1959). 2891. Southard, T. H., Yowell, E. C, An alternative "preditor- corrector" process. Math. Tables and Other Aids to Computation, VI, No. 40, 253 (1952). 389. Spaulding, A. D., Crichlow, W. Q., Roubique, C. J., Beery, W. M., Determination of the amplitude-probability

distribution of atmospheric radio noise from statistical moments. J 64D1, 49 (1960). Spencer, L. V., Calculation of peaked angular distribu- tions from Legendre polynomial expansions and an

application to the multiple scattering of charged

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(Yearbook Publishers, Chicago, 111.), p. 499 (1956). 1606. Energy dissipation by fast electrons. (1959) Mono. 1. Penetration and diffusion of X-rays: calculation of spatial distributions by semi-asymptotic methods.

Phys. Rev. 88, No. 4, 793 (1952). 509. The theory of electron penetration. Phys. Rev.

98, 1597 (1955). 1548.

Spencer, L. V., Attix, F. H., A cavity ionization theory

including the effects of energetic secondary electron. Radiology 64, No. 1, 113 (1955). 1229. A theory of cavity ionization. Radiol. Research

3, 239 (1955). 1247. Spencer, L. V., Berger, M. J., General relations between

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Young, J. P., Chromium for gun bores. Am. Rifleman

104, 39 (1956). 1647.
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Yowell, E. C, Some general precepts for programmers.

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Yowell, E. C, Huskey, H. D., Thorensen, R., Ambrosio,

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Zahn, C. T., Schweitzer, W. G., Jr., Excitation and

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17. Zapf, T. L., Capacitor calibration by step-up methods.

J 64C1, 75 (1960). Variable capacitor calibration with an inductive

voltage divider bridge. (1960) TN57 (PB161558).

Zapf, T. L., Hermach, F. L., Lead resistance errors in watthour-meter phantom load test. Elec. World

141, 113 (1954). 1049.

Zei, D., White, H. S., Special lubricants tests. Mech.

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Zelen, M., A note on partially balanced designs. Ann. Math. Stat. 25, No. 3, 599 (1954). 923. Analysis for some partially balanced incomplete

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10, No. 2, 273 (1954). 953. Experiments with many factors. Proc. 3d Annual

Statistical Engineering Symp. (Chemical Center, Md.),

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(1957) . 2207. The analysis of convariance for incomplete block

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Stat. Assoc. 52, 204 (1957). 2343. The use of group divisible designs for asymmetrical

factorial arrangements. Ann. Math. Stat. 29, 22

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Zelen, M., Connor, W. S., Fractional factorial experiment

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Multi-factor experiments. Ind. Quality Control 15, No. 9, 1 (March 1959). 2995.

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Zelen, M., Joel, L. S., The weighted compounding of two independent significance tests. Ann. Math.

Stat. 30, No. 4, 885 (1959). 3098.

Zelen, M., Severo, N. C, Newman, A. E,, Young, S. M., Some applications of statistical sampling methods to outgoing letter mail characteristics. (1959 TN16

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Zendle, B., Koch, H. W., Dose measurements in water

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Zentner, V., Brenner, A., Jennings, C. W., Physical

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Zerfoss, S., Walker, R.F., Holley, S. F., Gross, L. J., Temperature of the inversion in cristobalite. J 61, 251

(1958) RP2902.

Wernicke, F., Saylor, C. P., Brice, A. T., Color phase

contrast microscopy: requirements and applications.

J. Opt. Soc. Am. 40, 329 (1950). 37.

Ziegler, C. A., Schwebel, A., Technique for monitoring

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Ziegler, W. T., The vapor pressures of some hydrocarbons

in the liquid and solid state at low temperatures.

(1959) TN4 (PB151363). Zimm, B. H., Hoffman, J. D., Rate of thermal diffusion

of polymer molecules in solution. J. Polymer Sci. 15, 405 (1955). 1472. Zimmerman, E. W., Hart, V. E., Horowitz, E., Determination of sulfur in rubber vulcanizates. Anal. Chem.

27, No. 10, 1606 (1955). 1311. Zimmerman, E. W., Pangborn, E. F., Determination of grease in leather. J. Am. Leather Chemists Assoc.

46, 342 (1951). 219. Zurich, V. J., Watt, A. D., Coon, R. M., Reduction of adjacent-channel interference components from fre- quency-shift-eyed carriers. IRE Trans. Commun.

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293

7. A A and A*, commutators, 1653. Abelian, algebraic number fields, generalization of the normal basis, 1791. groups of unimodular matrices, 2886. Aberration, chromatic, secondary, 2295. longitudinal spherical, optical T-bench method of measuring, RP2880.

Abrasion, textiles, interpretation of tests for resistance, 473.

resistance, 2005.

resistance measurements on cotton fabrics made with

the blade type abradant and the Schiefer abrasion

testing machine, 382.

testing, 1089.

testing machine, Schiefer, 382. Abrasive jet method for measuring abrasion resistance of organic coatings, 1249. Abrasive-fluid mixtures, 221. Abscissas and weights for Gaussian quadratures of high

order, additional: values for to =64, 80, and 96, RP2875.

Absence, interference effects in the /3-decay of polarized CO" and CO58 nuclei, 2006. spontaneous emission of neutrons from samarium, 383. Absolute, intensities of the 721 and 742 cm-1 bands of C02 , 2007.

light-scattering photometer: I. Design and operation. RP2946.

measurement, 780. measurement of Walr for polonium-210 alpha particles, 2444. measurement of WBir for sulfur-35 beta rays, 2008. measurements at the NBS, status, 2781. photometry of the Gegenschein, 1919. points of a correlation, number of, 1943. temperature below 1° K: chromic methylammonium

alum as a thermometric substance, 2009. Absorbent materials, absorption of sound patches, 2010. Absorption, bands for the calibration of spectrometers from

2 to 16 microns, J 64A1, 29; Mono. 16. concrete of X-rays and gamma-rays, 1250. change in the inversion spectrum of ND3 from resonant

to nonresonant, 661.

infrared, of liquid water from 2 to 42 microns, 1038. low-frequency wing of the NH3 inversion spectrum,

639.

line half-widths and intensities, slit function effects in the direct measurement, 1867.

lines as very narrow pass filters, Zeeman-split, 3115. sound by patches of absorbent materials, 2010. spectra and the chemical constitution of dyes, 1543. spectra and the chemical constitution of dyes, relation. XXII. Cis-trans isomerism in thioindigo dyes,

341. spectra and the chemical constitution of dyes. XXIV.

Absorption spectra of some thioindigo dyes in

sulfuric acid, 342. spectra and the chemical constitution of dyes, relation between, RP2823.

spectra, infrared, 75; 1569.

spectra, infrared, of some cyclic acetals of sugars, RP2960.

spectra of solids condensed at low temperatures from

electric discharges, 2445. spectra of some aldopyranosides, conformations of the pyranoid sugars, J 64A3, 239.

INDEX

spectral, method for determining population "temperatures" in hot gases, 1882. spectrum of ND3 , microwave, 766. spectrum of vibrational^ excited N2 in active nitrogen, 2887. Abstract algebra, two problems connected with Horner's

rule, 1101. Abundance of free atoms in solid nitrogen condensed at

4.2° K from a gas discharge, 1607. Ac227

, nuclear moments, 1420. A-C, bridge for the audio-frequency range, 1615. bridge to measure core loss at high induction, use of, 1954.

current, clamp-on-microammeter measures, 2056.

zero locator, 2414. AC-DC transfer instruments for current and voltage measurements, 2446. Accelerated aging of record papers compared with normal

aging, 1251. Accelerating, components in particle spectrometers, 2649. convergence of iterative processes, 2447.

effect of aminos on polymerization of methyl methacrylate, 1608.

Accelerators, pulsed, charge-storage pulse-height analyzers

for use with, 2485.

sulfinic acid derivatives, in the polymerization of methyl methacrylate, 1906. Accelerometer, calibration, high-speed stroboscope for, 1031. ceramic, 175. Ramberg vacuum tube, recent developments, 297. Accelerometers, cemented piezoelectric, 660. dynamic characteristics, by rotation, 913. Acceptance sampling, electroplated articles, 940. variables with special reference to the case in which

quality is measured by average of dispersion, 16. Accomplishments at the International Conference in Bournemouth, England, Part III, 188. Accuracy, 2448. Accurate, radio-frequency microvoltages, 640. time-modulated pulse circuit, 646. Acetabacter suboxydans, isotope effect in oxidation of r>-mannitol-2-C14

, 2606.

Acetals, cyclic, of sugars, infrared absorption spectra, RP2960.

Acetate, cellulose, films, degradation, 2924.

cellulose, propionates, 237. propionate, and butyrate radicals, heats of combustion

of some peroxides and the heats of formation,

2148. Acetylene, air, 2928. methyltrifluoromethyl, internal rotation, 1374. Acetylene-db infrared spectrum, 1934. Acetylene-oxvgen, flame, kinetics of OH radicals, 476.

flames, 2311. Achromats, three color, selection of glasses, 3043.

Acid, o-ethyoxybenzoic and other chelating agents, 2829.

picric, 1085.

sulfinic, derivatives as accelerators in the polymerization of methyl methacrylate, 1906. treatment, effects of, on acid and abrasion resistance

of porcelain enamels, 51. weak, ammonium salt, 49. Acids, bases, precise coulometric titration, J 63A2, 153. benzene, aromatic carboxylic, relative strengths, RP2871.

intercomparison of, RP2769. 295
precise intercomparison of, by differential potentio- metric titration with the hydrogen electrode, 2260. Acoustic, field, 1223. impedance measurement, 46. impedance of right circular cylindrical enclosure, 941. method for the measurement of vibration amplitudes,

946.

pulses, electromagnetic and, propagation, 1799. wave field, diffraction and reflection, RP2906.

Acoustical tile, evaluation of adhesives, 55. Acoustics, architectural, standard methods of measurement,

2226. Acrylate and styrene polymers in a vacuum, 811.

Acrylic, plastic glazing, 699.

plastic, glazing, properties of, 436.

resins, crazing, 1298.

resins in prosthetic dentistry, 2449.

Acrylics, biaxial stretch-forming of, 658.

stress-solvent crazing of, 839. Action of boron in exhancing the hardenability of steel, 851.

Activities, NBS in the field of fire research, 1870. National Bureau of Standards Cryogenic Engineering

Laboratory, 1252. Addendum to a guide to tables on punched cards, 641. Addition, multiplication, high-speed methods, application

of digital computers to, C591, Sect. 1. hydrogen atoms to solid olefins at —195°, 2803. theorems for general Legendre and Gegenbauer

functions, 1253. Adherence of vitreous coatings to iron, effect of oxygen

content of the furnace atmosphere, 1329. Adherometer, electronic averaging device for, protective measurement, coating adhesion, 2273. Adhesion, electroplated coatings to titanium, 1920. nature of, 1080. organic coatings by ultracentrifugal and other methods, evaluation of, 715. survey, 1157. Adhesive-adherent systems, 208. Adhesives, acoustical tile, 55. cryogenic structural, epoxy resins, 2547.

engineering, selecting, 306. Adiabatic, apparatus for the study of self-heating of poorly conducting materials, 942. calorimeter for the range 30° to 500° C, RP2848'.

calorimetry, automatic temperature regulation and

recording, 2035. demagnetization and the temperature scale below

1* K, 384. Adjustable sliding termination for rectangular waveguide, 2012. Admittance of a diode with a retarding field, 566. Adsorption, C14 dextran to human blood platelets and

red blood cells in vitro, 2011.

diffusion, and evaporation of carbon monoxide on

tungsten, 2888.

fractionating process, 156. gases and vapors on glass spheres. II. Two dimensional condensation of oxygen, 1609. heats of, from charge-transfer complex theory, 2582.

polyesters on glass, silica and alumina, RP2933. Advancements in dielectrics, 642; 943. Advances (developments) in synthetic materials in America

in 1949, 21. Aerial photoreconnaissance, spectrophotometry, 2308. Aerodynamic, heating and fatigue, 2889. phenomena in stella atmospheres, TN30 (PB151389). Aerodynamical mechanisms producing electronic density

fluctuations in turbulent ionized layers, 1254. Agar-agar type duplicating material and agar-agar on

heating and storage, changes, 2050. Age to indium resonance for D-D neutrons in water, 2450. Agenda for commission on symbols, units, and nomenclature of the International Union of Pure and

Applied Physics, 189. Aging, changes in clinical thermometers, 385.

heat, and ultraviolet, of poly (vinyl chloride), RP2863.

Karakul and seal fur skins, 19. rubber vulcanizates, measurement, J 63C2, 141. some effects of, on the surface of portland cement

paste, J 64A2, 163.

Air, alpha particles in, collection of ions produced, 2488.

dissolved on the speed of sound in water, effect, 1686. interchange in, ion-atom, 1379. lubricated piston gage for pressures below one-half inch of mercury, tilting, J 63C1, 47. mercury-, and flat-type cells, dry cell standards broadened—now includes, 1321.

nitrogen, and oxygen, rotational relaxation, 3038.

pollution, determination of carbon monoxide in studies, 1309. replaces sand in "no-fines" concrete, 190. shock, fragmentation of waterdrops in the zone behind an, RP2843.

slide rule computes radio refractive index of, 829. technique for monitoring tritiated-water vapor, 2338. truck tire, temperature studies, 1917. Airborne, electronic equipment, new techniques for fabri- cation, 1415.

television station, TN35 (PB151394).

Aircraft, delta-wing, effect of rib flexibility on the vibration modes of, RP2852.

lighting, research, NBS development and testing, 771.

materials, creep and creep rupture characteristics of some riveted and spot-welded lap joints, 1299.

materials, creep behavior of structural joints of, under

constant load and temperatures, 2071.

plastics, 2255. sheet materials for large strains, Poisson's ratio, 798. Airglow, cells, 2640.

cells, characteristic size, 2807.

5577, possible movements, 2695.

night, 2825. oxygen red lines, 2681. photometric observations, 2247. photometry, review of observational results, 1242. Airglow and aurora, 1271.

origin of [OI] 5577, J 63D1, 15. photometric unit, 1598. Airplane, camera calibration, 1878. cameras, calibration, 2045. mapping cameras, 32. Airspaces, fibrous insulations bounded by reflective surfaces, thermal resistance, BMS151.

thermal insulating value, 1203. Airy functions, integrals of, AMS52.

Albedo of various materials for 1 Mev photons, 1170. Aldehyde, carboxyl, pentosan, and degree of polymerization data on the ICCA "standard" pulps, 2890.

cellulose, determination, 1308. Aldonic lactones, sodium borohydride reduction, 1868. Aldopyranosides, infrared absorption spectra of, conformations of the pyranoid sugars, J 64A3, 239.

Aldoses-1-/, J 64A2, 177. modified celluloses, reaction of sodium chlorite, 1473. Aleutian, NRL, radio eclipse expedition, 273. Algebra, abstract, two problems connected with Horner's

rule, 1101.

electronics, 2803A.

Algebraic, equations satisfied by roots of natural numbers.

1610. number theory: computation of cyclic cubic units, RP2783. number theory estimates based on the Dedekind etafunction, 1871. proof of the isoperimetric inequality for polygons,

1259. Alignate hydrocolloidal dental impression material, 986. Alignment, cerium141 and neodynium147

, 1255. three odd-A rare-earth nuclei, 1611. three rare-earth isotopes, 1256.

Alkali, borates, molten, viscosity and electrical resistivity

of, 907.

silicate binary glasses, role of vitrons, RP2854. 296
silicate glasses, density formula for, from annealing to glass-processing temperatures, RP2915.

Alkali-aggregate, reaction and the ionic charge on hydrated

cement, 2639.

reaction in concrete, physical-chemical studies, RP2780.

reactions, mechanism, 1406.

Alkaline, chromate solutions, electrolytic coatings on magnesium base alloys, 1332.

solution of potassium chromate as a transmittancy standard in the ultraviolet, 388.

solutions for pH control, 1612. Alkaline-earth borates, 3059.

Alkalis and alumina in ternary systems, 2785. Allocation problem, coefficients, 2808.

Alloy, aluminum, alclad, 24S-T86 sheet, 139. aluminum, sheet, 1303. magnesium, specimens, fatigue strength, 1531.

nickel, copper, and nickel-copper, annealed, creep of, RP2836.

steels, slack-quenched impact properties, RP2799.

Alloys, aluminum, 2841A.

"aluminum, effect of 20-year marine exposure, 1689. aluminum, two forged, investigation of bearing creep, TN55 (PB161556). aluminum under various temperature conditions, 2505. austenite iron-carbon-nickel, note on thermal stabili- zation, 777. chromium-cobalt casting, for dental, proposed specification, 1996. chromium cobalt, physical properties, 2687. common commercial aluminum, thermal conductivities, 2842. copper, thermal conductivities, 2393. enthalpy and heat capacity from 0° to 900° C. of three nickel-chromium-iron of different carbon

contents, RP2870.

gallium copper-tin, some physical properties, 1876. gallium with powdered metals as possible replacement

for dental amalgam, 1613. iridium-osmium, 1152.

low-strategic, with a chromium boride-nickel cermet

coating, protection, 1463. low temperatures, impact testing, 2819. thermometric, 2833A.

thermometric, therm."5 ! emf, 2844A.

tin-indium in the normal state, thermoconductivity,

2845. two-phase textural stresses in. RP2793.

Alpha, particles in air, collection of ions produced, 2488.

particles near 5-Mev and by beta particles, 2912. standards, NBS, 2644. Alpha-chloro-acrylate, polymethyl, properties, 520. Alpha-gamma angular correlation in ionium (TH230), 643. Alpha-particle, energy levels in F18

, : tactions in nitrogen,

711. Alternative, derivations of Fox's escalator formulae for latent roots, 386. "predictor-corrector" process, 389. proof of a theorem on unimodular groups, 1260. Alum, chromic methylammonium, as a thermometric

substance, absolute temperature below 1°K,

2009. Alumina, alkalis in ternary systems, 2785. lanthana, svstem, 2472.

shapes, zircoDia, 173. Aluminum, alloys, thermal and electrical conductivitv, 2841A.

alloys, two forged, investigation of bearing creep, TN55 (PB161556).

antimonide, 1007.

concrete, isotropic sources through, penetration of gamma rays, TNll (PB151370).

degree in orientation and crystal size on the scattering

of 20-kev electrons, 2529. determination in precipitation hardening stainless

steel and high temperature alloys, J 64A2, 181. electrodeposition of, hydride bath, 363.

electrons in, temperature dependence of the characteristic energy loss, 2798.

foil, mineral-wool blanket, and mineral-wool board, thermal insulating properties, BMS151.

gallium phosphate, low cristobalite type, crystal structure, 1923.

lead, and concrete in the range 275 to 525 kilovolts, X-ray attenuation, 1582.

oxide, heat capacity, RP2848.

oxide in the range 300° to 700° K, heat capacity, 2362.

single crystals, growth of, RP2868.

steel, separation and determination of small quantities

of, J 64A3; 235. welded 5086; 3095. Aluminum-alloy, forgings, large, mechanical tests on speci- mens, 1772.

sheet, 1303. Aluminum alloy, alclad, 24S-T86 sheet, 139. Aluminum alloys, common commercial, thermal conductivities, 2842.

corrosion of, by exhaust gases, 979.

effect of 20-year marine exposure, 1689. under various temperature conditions, 2505. Amalgam, dental, 1613.

dental, microstructure, 765. dental: the effect of mechanical condensation of some

physical properties, 423. sodium, in the form of pellets, preparation of, J 64A1,

135. Amalgams, Ag-Sn (Cu-Zn), stability of, 1493. Amelung glasses compared with some modern commercial

glasses, 387. American Chemical Society specifications, reagent chemicals, 1474. American Dental Association, contribution to dental sci- ence, 2891.

specification No. 3 for dental impression compound,

revision, 1244.

specification No. 9 for dental silicate cement, 20. specification No. 12 for denture base resin, 644.

specification No, 13 for self-curing repair resins, 1257.

specifications for dental materials, 1614; 2451. American, dielectric standards, 944. standard building code requirements for masonry, 945. American Standards Association, Report of the Committee,

3036. Amerikanische Kunststoffentwicklung im Jahre 1949, 21. Amide nitrogen of collagen and hide powder, 645. Amino acid, polar, content of collagen and related material, 841. Aminos on polymerization of methyl methacrylate, accelerating effect, 1608. Ammonia, deuterated, 2411. hydrazine with oxygen atoms and hydrogen atoms in atomic flames, reactions, 1948. inversion in, interaction of stretching vibrations, 1744. maser as an atomic frequency and time standard,

2804.

nitrogen, oxygen, hydrogen, and water, electric dis- charge, 2309. vibration-rotation bands, 2411; 2862; RP2894. Ammonias, deutero, microwave spectra, 260. Ammonium, hexabromoosmate, 1201.

salt of a weak acid, 49. Ampere, 3064.

Amplifier, audio-frequency power, circuits, a survey, 187- cryostat heating control, 2090.

direct current, and recorder to balance a Mueller re- sistance bridge, 3107. feedback, with negative output resistance for magnetic measurements, 2421. impedance transistor, 2586.

Amplifiers, gain stable mixers with current feedback, 1022.

dielectric, 963. feedback, chart speeds design, 410. feedback, tuning systems, 352. feedback, with stabilized output impedance, 719. 297
Amplitude, constant vector plus a Rayleigh-distributed

vector, 1541.

scale, and spectrum of refractive index inhomogeneities in the first 125 meters of the atmosphere,

1258.

scintillations of radio stars observed at Boulder, Col- orado, a preliminary analysis, TN20 (PB151379).

stability of the cathode-coupled oscillator, frequency,

62. stabilization of a microwave signal source, 2452. Amplitude-probability distribution of atmospheric radio

noise from statistical moments, determination, J 64D1, 49. Amplitudes, vibration, acoustic method for the measure- ment of, 946. Amorphous, high polymeric systems, viscoelastic phenomena, 2863. polymers over an extended temperature range, vol- ume temperature relations, 1975. Ampoules of active materials, 8. Analog, computer for radioactive fallout prediction, 1616. equipment, representation of nonlinear functions of two input variables, 2285.

Analog-digital, conversion equipment for electrocardio- graphic data, TN42 (PB151401).

simulation for the design and improvement of manmachine systems, 2453. Analogs, discrete, of inequalities of Wirtlinger Monatsh

1313.

Analysis, anomalous properties of equiphase contours,

22. atomic spectra with electronic digital computers

1624.

brittle behavior in ship plates, 954. calculation of immiscibility, 2320.

collagen and collagen derivatives, paper chromatographic, 1597. continuous of ortho-parahydrogen mixtures, 1294. convariance for incomplete block designs, 2342.

dielectric loss in two urea addition compounds, 2454.

films in, of tritium-labeled compounds, J 63 A2, 171.

first spectrum of ruthenium (Ru i), J 63 A3, 213. fluorinated polyphenyls by mass spectrometer, 1263. goniophotometric reflection curves, 397. hydrogen-deuterium mixtures in presence of air, optical spectrophotometric, 505. incomplete block designs, 2343.

ionic recombination including ion production during measurements, 193. ionospheric vertical soundings for electron density

profile data. TN14 (PB151373) ; TN19 (PB151378).

millimicrosecond pulses using a charge-storage type

pulse-height analyzer, 2895. natural gas, 25. numerical, modern, solution of. I. Differential equations by recurrence relations, 97. numerical, motivation for working, 1410. numerical. 2. Note on the condition of matrices,

98. numerical, notes, 271; 272.

partially balanced incomplete block designs having a

missing block, 953. photocross, 2460. propagation measurements made at 418 megacycles

per second well beyond the radio horizon (a digest), J 64D3, 255. propagation measurements made at 418 Mc well beyond the radio horizon, TN6 (PB151365).

solar spectrum from 2990 to 2635A, revised, 933.

solids with the mass spectrometer, 194. spectrochemical, index to the literature, 1036; 2965. vibrational relaxation data in shock wave experiments.

2896.

(0.1) and (1.2) bands of the *A-V system of CH,

1625. Analyst, modern, and pH, 2242A.

Analytic, characteristic functions, 496. comparison of suggested configurations for automatic

mail sorting equipment, J 63B2, 83. 298

functions, 1093; 1096.

functions, periodic, numerical integration, 3009. study of war games, 1264. systems for linear differential equations, 932. Analytical, chemistry, statistics, 138. data, statistical treatment, 2780. determinations, statistical aspects, 553.

distillation, 2744.

integration of the differential equation for water

storage, J 63B1, 43. mass spectrometry, 1626. methods by the sensitivity criterion, evaluation, 2112.

procedure, a plan for studying the accuracy and precision of, 926. procedures: natural and synthetic rubbers, 2020. Analyzer, stroboscopic vibration, J 63C2, 97. Analyzing, extreme-value data, 922.

straight-line data, 652. Anelasticity of quartz, 653. Anemometry, hot-wire, 247. Anesthesia, physological monitor, 1446. Angular, correlation of radiations with parallel angular moments, 2021.

correlations, geometrical characterization of nuclear

states and the theory of, 726. Angular distribution, multiple-scattered gamma radiation from a plane isotropic source, 1265. neutral meson decay, 2461. Anhydrous, gallium orthophosphate, temperature inversions, 1916. indium phosphate and thallic phosphate by X-ray

diffraction, crystal structure, 1667. scandium phosphate, structure, 1950. Anisotropic, inhomogeneous medium, wave propagation

in, 910. media, elastic waves, 2104.

relaxation peak in the internal friction of crystalline quartz, 2022. Annealed nickel, copper, and two nickel-copper alloys, creep of, RP2836.

Annealing, silicate glasses during, structural rearrange- ments, 1901. Annual, report of the Director of the National Bureau of Standards for fiscal years ending June 30. 1957: M223

1958: M226

1959: M229

review of pulp and paper industry, 1627; 2024. Annular-slot antenna, low frequency, RP2822.

Anodic (HAE) coating on the fatigue strength of magnesium alloy specimens, 1325; 1531. Another milestone in screw thread standardization, 2025. Antenna, annular-slot, low frequency, RP2822.

curved lossy surface, 2682. function of the diameter and length of the driven

element, impedance of a corner-reflector, J 64D2, 135.

gain, path, in an exponential atmosphere, J 63D3,

273.

gain, techniques for accurate measurement, C598.

height at 100 Mc, radio transmission loss vs distance, 1470.

heights, three transmitting, report on comparative

100 Mc measurements, 1848. high-frequencv, long distance horizontal radiation

pattern, 2371.

horizontal, over a spherical earth, low frequency

radiation, 1761. insulated loop, immersed in a conducting medium,

RP2781.

microwave, pattern of a flush mounted, RP2796" monopole with symmetrical top loading, earth currents

near, RP2959. optimum, height for ionospheric scatter propagation,

3011.

patterns, 481. radiation pattern of, mounted on a surface of large radium of curvature, 1946.
size, effect of, on gain, bandwidth, and efficiency, J 64D1, 1. slot-arrav, on a finite and imperfect ground plane,

patterns, 2826. top-loaded monopole, earth currents near with special regard to electrically small L- and T-antennas, RP2961.

top-loaded monopole, the electric field at the ground

plane with special regard to electrically small

L- and T-antennas, J 64D2, 139. VHF monopole, 2437. very-low-frequency, for investigating the ionosphere with horizontally polarized radio waves, J 64D1,

27. Antennas, waveguides, 2402. annotated bibliography, 2897.

corner-reflector, gains of finite-size, 2574.

high-gain, for VHF scatter propagation, 1729. low frequency, portable, operating over ice and snow

covered terrain, 2220.

slotted-cylinder, pattern synthesis, J 63D3, 303. spaced, far beyond the radio horizon, 1401.

Antifreezes, engine, determination of freezing point, 331. Antimonide, indium, elastic moduli, 1693.

electrical properties, 703.

indirect transitions, 1736.

piezoelectric effects, 2690.

piezoresistance, 2252. thermoelectric power, 1559. Antimonide, n-type indium, galvanomagnetic effects, 2135. p-type indium, galvanomagnetic effects, 2136. Antioxidants on asphalt durability, effects of, J 64C1, 13. Apatite, enamel, isomorphous substitution, 748. Apparatus, determining freezing points at saturation pres- sure from time-temperature freezing and melting

experiments, 26. direct determination of the dynamic bulk modulus,

1629. etching fine points under controlled conditions, 1628. measurement of the normal spectral emissivity in the

infrared, J 64C2, 99. measurement of thermal conductivity of solids at low temperatures, RP2805.

measuring the piezoresistivity of semiconductors, RP2814.

simple humidity, 1487.

Application, configuration interaction to the Hs complex,

2027. low M/n triodes to series regulator circuits, 1630. Monte Carlo method to a problem in gamma-ray

diffusion, 1618.

photoelasticity to the design of tensile specimens for ceramic metal materials, 1266. photoelectric multiplier tubes to the sensitive measure- ment of absorption or of changes of relative light

intensities, 27. preparation, and maintenance, of standards of radioactivity, C594. RF micropotentiometers for calibration of signal generators to 1000 Mc, TN37 (PB151396).

theory of stochastic processes to chemical kinetics, 2805; 2898. two methods of numerical analysis to the computation

of the reflected radiation of a point source, 1267.

variational methods to intermediate and high energy

scattering, 955.

viscosity methods to the study of branching in polysaccharides, 654. Applications, extreme-value theory, 1140. standards of radioactivity, 1631.

statistical sampling methods to outgoing letter mail

characteristics, TN16 (PB151375). theorem on partitioned matrices, J 63B2, 73. theory of quadratic forms in Hilbert space to the

calculus of variations, 195. Applied optics at NBS, 655. Approximate, daytime constancy of the absorption of radio waves in the lower ionosphere, 2661.

expression for gamma-ray degradation spectra, RP2788.

theory on the stability of interfacial waves between two streams, 1632. Approximation of linear elliptic differential equations by

difference equations with positive coefficients, 785. Approximations, discrete, to elliptic differential equations,

1314.

linear viscoelasticity theory: delta-function approximations, 956. Arc-discharge tubes in regulated low-voltage supplies, 615. Arc-lengths along the lines of force of a magnetic dipole, 1633. Architectural acoustics, standard methods of measure- ment, 2226.

Arctic, communication, conference on, J 64D1, 73. ionosphere IGY program, 1936. Argon, nitrogen, negative atomic iodine ions, 605. temperatures between 0° and 75° C and at pressures up to 2500 atmospheres, thermal conductivity,

1952. Arithmetic, 2500. Aromatic, carboxylic acids in benzene at 25° C, relative strengths, RP2871.

hydrocarbons, electron impact studies, 2938. hydrocarbons filtered from smoky air, mass spectra RP2876.

Arsenate, silicate, and phosphate, separation and deter- mination, RP2954.

Arsenic sulfide glass, properties, RP2774.

trisulfide, refractive index, 2726. Arsenide, n-type indium, oscillatory galvanomagnetic ef- fects, 2678.

Artificial, auroras resulting from the 1958 Johnston Island nuclear explosions, 2899.

dentures, 1194. Aryl silanes, 1192. Asbestos-cement pipes, 998. L-ascorbic acid-C14

, synthesis of, RP2800.

Ashes, refractoriness, chemical analyses, surface area, and

thermal reactions of natural graphite, and, 665. Aspects, charge and discharge processes in lead-acid stor- age batteries, 1141. depolymerization kinetics, 307. gamma ray penetration theory relevant to shielding problems, 2028.

large scale liquefaction of hydrogen, 1491. prediction in the study of complex systems, 2225. tropospheric radio wave propagation, 1872. Asphalt, changes in the properties, during the blowing

operations, RP2835.

durability, effects of antioxidants, J 64C1, 13. effect of light and water on the degradation of, J 63C1,

31. influence of exposure conditions on the accelerated

durability testing, 1738. research at the National Bureau of Standards, 2029. water-soluble degradation products, 2413. Asphalts, infrared spectra of, J 63A2, 189. Assignment problem, 1921. ASTM, crude natural rubber subcommittee, 3065. methods and standards for appearance evaluation, status of, 3055A.

problems, student reasearch, 1903. Astronomical spectra, lines of the chemical elements, 1758. Astronomy, new method of solution for unretarded satellite orbits, J 63B2, 105.

solar radio, at the NBS, 1490. Astrophysical, a multiplet table, of interest, TN36

(PB151395).

interest, partial Grotrian diagrams, 1758. Astrophysics, TN36 (PB151395). atomic spectra—their role, 1974. Asymmetric rotor molecules, tables of line strengths for rotational transitions, 2796. Asymmetrical factorial arrangements, the use of group

divisible designs, 2836.

569918 0—61 20 299
Asymptotic, behavior of tests on the mean of a logarith- mico-normal distribution with known variances. 2030. expansion of error integrals, brief note, 1383. expansions for the parabolic cylinder functions, 366. expansions in general regions, uniqueness theory, 2400. lower bounds for the frequencies of certain polygonal membranes, 957.

series for functions occurring in the theory of diffraction of waves by wedges, 1792.

solution of the differential equation of hydrodynamic

stability in a domain containing a transition

point, 656. transformation of certain distributions into normal

distribution, 1795. Atlas of oblique-incidence ionograms, TN31 (PB151390). Atmosphere, circularly stratified, focusing, defocusing, and refraction, J 64D3, 287. CRPL exponential reference, Mono. 4. earth's, OH emission, 3001.

earth's outermost, interplanetary space, 2969.

earth's upper, gravitational and thermal oscillations, 1726. exponential reference, Central Radio Propagation

Laboratory, J 63D3, 315.

first 125 meters, amplitude, scale, and spectrum of refractive index inhomogeneities, 1258. furnace, on the adherence of vitreous coatings to

iron, effect of oxygen content, 1329.

infrared spectra of molecules, 2377. inhomogeneous, radio wave propagation, TN24

(PB151383).

lower, average radio-ray refraction, 400. non-equilibrium, source function, 2767. path antenna gain in an exponential, J 63D3, 273.

radio, at short ranges, waveform, 1800. radio waves in, oxygen and water vapor absorption, 2241.

solar, motion in, as deduced from radio measurements,

263.

sun, elements in, 1138. turbulent, over irregular terrain, propagation, 1550. turbulent, rate of fading in propagation, 1542. upper, excitation mechanisms of the oxygen 5577

emission, J 63D3, 319. upper, in the auroral zone, 2766. upper, negative oxygen ions, 1413. upper, study of radio reflections from meteor trains

in research, 144. Atmospheres, stellar, 2463.

stella, aerodynamic phenomena, TN30 (PB151389).

Atmospheric, bending of radio waves, 2806.

circulations and tropospheric scatter propagation, J 64D1, 81. dynamo theory, 2228. horizontal inhomogeneity, effect of upon ray tracing J 63D3, 287. negative ions, photodetachment, 2245.

noise from 1 to 100 Kc/s, characteristics, 2052.

noise, measurement, 2189.

noise, VLF, 2351.

oscillations, extension of the Sen-White paper, 1341.

oscillations, thermal and gravitational excitation, 1555. ozone, continuous measurement, by an automatic

photoelectric method, 977.

pressure, rotational and vibrational "temperatures"

of CH in flames, 816. radio noise data, report, 1851. radio noise from statistical moments, determination

of the amplitude-probability distribution, J 64D1, 49. radio noise, VLF, 2188. radio refractive index, 3002.

refractive index at radio frequencies, 855.

refractive index, microwave measurement of variations, 585. research, 2031; 2462.

tides in barometric pressure, solar and lunar, 1586.

total, bending of radio rays at small elevation angles TN44 (PB151403).

transmittance of Mauna Loa, studies, RP2910.

transverse, drag on satellite orbits, 2532. turbulence, 1402. turbulence, measurement of the phase of signals' received over transmission paths with electricall; lengths, 1770. waveforms, some characteristics of VLF propagation 1 2760. Atmospherics, measured frequency spectra of very-low- I frequency, J 64D1, 41. Atom, improved hydrogen, beam furnace, TN47 I (PB151406).

nitrogen, recombination, kinetics of, 2972. Atomic, beam, electron optical image, 1704. beam sources and standard of length, 2464.

clock, a universal standard of frequency and time.

148. clock and frequency stabilization on microwave

spectral lines, 196. definition of primary standards, 28. electron affinities, 2900. energy levels, C467, Vol. III. explosions, temperature, 1528.

flames, reactions of ammonia and hydrazine with oxygen atoms and hydrogen atoms, 1948. flames: spectra "temperatures" and products, 1268. frequency and time standard, 2804. freouency standard, 2555. hydrogen plus atomic sodium, chemiluminescence in the system, 2486. molecular negative ions in stellar atmospheres, 2463. molecular time standards at the NBS, 2549.

negative, iodine ions in nitrogen and argon, total

collision cross section, 605. nitrogen and carbon monoxide, luminous reaction, 2183. nitrogen and organic substances, 2544. operations in the United States, influence of lower

permissibles levels on, 2598. oxygen and carbon monoxide, luminous reaction between, 866. oxygen and solid ozone, note on the preparation

1239. oxygen at low temperatures, 2954. oxygen, electron affinity, 1334; 2812. oxygen, photodetachment cross section and the

electron affinity, 2683. oxygen, the affinity and radiative attachment

coefficient, 1413. radiation and polymers, 1634. radiation on polymers, effects of, 698. sodium plus atomic hydrogen, chemiluminescence in tb /system, 2486.

spectra, 1269.

spectra, Bacher and Goudsmit's theory of, comparison

of first, second, and third approximations, 2492.

spectra, data concerning, 677. spectra for the astrophysicist, 197. spectra, notation for, 775. spectra with electronic digital computers, analysis, 1624. spectra—-their role in astrophysics, 1974.

sulfur and empirical affinities of the light elements,

electron affinity, 1698. theory of electromagnetic interactions in dense

materials, 1635. weights, 127. weights and nuclidic masses, 2906. weights for 1956-57, report, 2731.

weights, report of the committee of the American

Chemical Society, 531; 1129. Atoms, free, in solid nitrogen condensed at 4.2° K from a gas discharge, abundance, 1607.

free radicals, 2622. 300
free radicals, luminescence of solid nitrogen (4.2° K),

2182. hydrogen, intensity distributions in nitrogen bands

excited in auroras and by high-energy protons,

1044. hydrogen, the addition, to solid olefins at — 195°, 2803. hydrogen, with solid olefins at —195°, reaction, 2828.

ions in the sun, 958. molecules, basic physics, 2901. molecules of solid nitrogen, 1104.

nitrogen, trapped in solids, 2392. oxygen and hydrogen in atomic flames, reactions of ammonia and hydrazine, 1948.

spectra, and molecules in solid nitrogen condensed at

4.2° K, interpretation, 1747. Attenuation, coefficients for X-rays from 10 kev to 100 Mev, C583 Suppl.

data, radiation, 3027. due to rainfall, 29. 86- and 176-Mev synchrotron X-rays in concrete and

lead, 1635A. 14,1-Mev neutrons in water, 2032. gamma-ray, 724. gamma rays at oblique incidence, 1171. Rayleigh waves with depth in a medium with two

surface layers, 2344. versus frequency characteristics, comments, 2059. versus frequency characteristics of VLF radio waves,

2345. Attenuator, magnetic, at UHF, characteristics, 663. magnetic, ultra-high frequency, 902. pads, lossy cable, 754.

piston, chart for TEn, 664. UHF oscillator, 216. Attenuators, cascade-connected, 33. Audio oscillator, low-distortion transistor, 755. Audio-frequencies, measurement of voltage ratio, 2191. Audio-frequency, electromagnetic hiss recorded at Boulder

in 1956, 2033. electromagnetic noise during a period of solar dis- turbance, 2019. power amplifier circuits, a survey, 187. range, A-C bridge, 1615. Audiometer earphones, 632. Audiometers, calibration, 31. Aurora, a monochromatic low latitude, J 63D3, 297.

airglow, 1271. Aurora and airglow, photometric unit, 1598. middle and low latitudes, 2346. October 22/23, 1958, at Rapid City, South Dakota,

J 64D2, 205. sporadic-E echoes at Barrow, Alaska, relationship, 1845.

Auroral, absorption zone, location of, 1054. observations, visual, 2412. subauroral zones, [OI] 5577 in, comparison of absolute

intensities, J 63D1, 19. zone, ionosphere, 2317.

zone, some studies of the upper atmosphere, 2766.

zone, southern, clues to ionospheric conditions, 1650. Aurorars, artificial, 2899. Austenite iron-carbon-nickel alloys, note on thermal

stabilization, 777.

Austenitic, stainless steel, 2789.

stainless steel, stress corrosion cracking of type 304, 1898.

stainless steels at low temperatures as determined by

magnetic measurements, 3093.

Australite (meteoric) glass, 1636. Autographic stress-strain recorders, 2465. Autoignited heptane-air mixtures, emission spectra, 442. Autoignition, benzene-air mixtures, mechanism, 1773. engine fuels, multistage, 1411. two-stage, of some hydrocarbons, 354. Automatic, coding principles, 2466. computation of nerve excitation, 1272. computations with power series, 1638. computers, development, 1675. computing machines, 233.

controller for radiofrequenoy induotion-heating unit, counting machine, 398.

cut-off valve for ion-exchange columns, 1273. data processing in Government (1956), progress

report, 1822. frequency comparator and recorder, high precision, 1356. instrument for electron scattering measurements,

1274.

lens design methods, 2034. temperature regulation and recording in precision adiabatic calorimetry, 2035. timer simplifies small-current measurements, 2036. Automation, brief look at the history, 1585. future management information systems, 2467. future office and factory, 1715. instrumentation, 1370. laboratory, in the, 2468. Automotive research at the NBS, 399. Average, energy of sulfur-35 beta decay, RP2859.

radio-ray refraction in the lower atmosphere, 400. Axial line source, surface-wave resonance effect in a re- active cylindrical structure excited by an, J 64D1, 13. Axial-load fatigue machine, dual amplitude, 626. Azide, methyl and hydrazoic acid by electron impact

ionization and dissociation, 2604. Azo dyes, 881.

direct interaction in aqueous solution RP2823.

indigo dyes steric effects 1897. organic solvents hydration 1543. B

Bacher and Goudsmit's theory of atomic spectra comparison of first second and third approximations

2492. Background eradication in thick-layered emulsions, 30. Backscatter, delay and CW field intensity, comparison,

361. frequency 1 158. Backscattering of, gamma-rays, 934. gamma rays, cobalt-60, from infinite media, 959. positive electrons, 131. positrons and electrons, 567. Balance, NBS 1000-lb, 1539. quick-weighing, 1168. Balances, a photoelectric followup and recording system, and its application to remote observations of the beam in high precision, J 63C2, 91., analytical and other precise, 1166. Ball bearings, at high speed and high temperature, oil- soaked felt-pad lubrication, 1422. high speeds and extreme temperatures, friction and

endurance of prelubricated and unlubricated, J 63C1, 19. submerged in liquefied gases, 3063. Ballistocardiography, 951. jerkmeter, 1752. Balmer lines, early, to extend the photospheric model,

2675. Banach, complex, spaces, Newton's method, 559. Bandwidth, television, conservation, communication

theory aspects, TN25 (PB 15 1384). Bar magnet velocity meter, 174. Bar-magnetic velocity meter for use in ballistocardiog- raphy, 951. Barium, borate, vitreous, radial distribution study, J 64A3, 229. disilicate-dibarium trisilicate, subsystem, phase

equilibria, RP2953.

disilicate, polymorphism, 3018. hydrogen orthophosphate, crystal structure of, RP2817.

oxide-boric oxide-silica, shape of liquid immisicibility volume, 2754. oxide-borio oxide-silicate, some properties of glasses

in the system, 2763. 301
titanate, 3062.

titanate, sammarium doped, electrical properties, 2105. Barometers, mercury, and manometers, Mono. 8. Bars, long, with a sling-shot machine, longitudinal impact

tests, 1760. rectangular, shear modulus and torsional resonance

frequencies, RP2861.

uniform, comparison of experimental and theoretical

relations between Young's modulus and the

flexural and longitudial resonance frequencies, J 64A2, 147. Bases and acids, precise coulometric titration, J 63A2,

153

Basic, experimental studies of the magnetic field from

electromagnetic sources immersed in a semiinfinite conducting medium, J 64D1, 21. method of determining the dynamic characteristics

of accelerometers by rotation, 913. physics of atoms and molecules, 2901. research in Europe, 2470. standardization, 2469. standards for science and industry, 2037. standards in science, 198. theorems in matrix theory, AMS57.

Basis, for standards for radiation protection, 1639. measuring system, of our, 3066. Ba113

, disintegration, 1178. BaTi03, SrTi03 , and associated materials, surface layer, electroluminescence, 2539.

Batteries, and dry cells, specification, H71.

lead, storage, 751. modern, 2204.

punched-cell, with polyethylene glycol electrolytes, 1828.

storage, lead-acid, some aspects of the charge and

discharge processes in, 1141. thermal, 602. wax, 2866. Battery, electrochemical, system, 2436. Beam flux, use of zonal constants in the calculation of, 887. Beams, strains in, having diagonal cracks, 2782. thermal stresses and deformation, 1962. Bearing creep of two forged aluminum alloys, TN55

(PB161556).

Bearings, and pumps at low temperatures, operation,

2676.

lubrication, 82.

oil-free, small, materials, 2184.

plain journal, oil flow, 494. Becker, value of manila rope by photoelectric reflectometry, 960. Beckman, quartz spectrophotometer, minimizing anomalies in reflectance measurements, 484. Begrundung fur die Beschaftigung mit numerischer

analysis, 1275. Behavior, in the large of the integral curves of a nonlinear differential equation, 2662. long helical springs under fluctuating load, 1530. "pure gum" rubber vulcanizates in tension, 1640. young children under conditions simulating entrap- ment in refrigerators, 2471. Bekk and Sheffield smoothness testers, use of the sensi- tivity criterion for the comparison, 1970. Bend-test method of determining the stress required

to cause creep in tension, 1584A. Benzene, derivatives from 15 to 40 microns, infrared absorption spectra of twelve substituted, 75. purity of, thermometric and calorimetric procedures, comparison of cryoscopic determinations, 2062.

relative strengths of forty aromatic carboxylic acids

in, at 25° C, RP2871.

vapor pressure of, above 100° C, 616. Benzene-air mixtures, mechanism of autoignition, 1773. Benzenes, pentafluorohalo-, reactions, J 63A2, 167.

tetrafluoro, 1,2,4-, preparation of from 2-chloro- heptafluorotoluene, RP2939.

Benzoic acid-7-C14 in toluene, for liquid scintillation counters a carbon-14 beta-ray standard, J 64A2,

143. Benzonitrils, microwave spectrum of, 1075. Bergman's, integraloperator erster art und Riemannsche

Funktion, 401.

integral operator of the first kind and the Riemannian function, 401. Berkeley symposium on mathematical statistics and

probability, 114. Bernoulli and Poisson positive, variables, tables of ex- pected values of 1/X, 1161. Beryllium, and beryllium alloys, 2107. between 0° and 900° C, specific heat, 312. chromite and other beryllia compounds with R2O3

oxides, studies of, J 64A1, 103. oxide, thermal conductivity, from 40° to 750° C, RP2775.

Bessel function, relative extrema, 104. Bessel functions, 249. fraction order, zeros of the derivative, 912. generation of, on high speed computers, 2140. hypergometric series, representation, 2236. polynomials, 72. respect to the order, on the derivative, 2666.

Bessel integral functions, expansions, RP2786.

Bessel-Clifford, and Bessel functions, 214. functions, terms of, regular and irregular Coulomb wave functions expressed, 1127. Best approximation polynomials of given degree, 1641. Beta decay, average energy of sulfur-35, RP2859.

experimental test of parity conservation, 2015. polarized nuclei, 2557.

polarized nuclei, further experiments, 2132. Beta emitters, scintillation counting, 2750.

rays, absolute measurement of Wa i r for sulfur-35, 2008.

tester, transistor, 2396. Beta-alumina-type structure in the system lanthana- alumina, 2472. Beta-emitting nuclides, 1200. Beta-gamma correlations from polarized manganese-52,

2473.

correlations from polarized nuclei, 2902. Beta-ray, sources, industrial, safe design and use of, H66.

spectrometers, 657. standard, carbon-14, benzoic acid-7-C14 in toluene, for liquid scintillation counters, J 64A2, 143. Betatron, experiments, 1213. pulsed magnetic extractor for removing the electron beam from, 929. X-rays: how much concrete for shielding, 961. X-rays to 37 Mev, studies of dose distributions in water, 1904. Betatrons, injection in, electron, 1700. Bias supplied for direct-coupled circuits, 962.

Biaxial, stretch-forming effects, 434. stretch-forming of acrylics, 658. Bibliography, and survey of recent research in the propagation of VLF radio waves, TN58 (PB161559).

molecular and crystal structure models, Mono. 14. nickel and its alloys, C592.

physical equilibria and related properties of some

cryogenic systems, TN56 (PB161557).

selected, of statistical literature, 1930 to 1957: I. Correlation and regression theory, J 64B1, 55. selected, of statistical literature, 1930 to 1957: II. Time series, J 64B1, 69. selected, on building construction and maintenance, BMS140, 3d ed. Bilinear transformations and matrices, commuting, 1654. Binary, alkali borate and silicate glasses at high pressures, compressibility, 1292.

alkaline-earth borate glasses at high pressures, compressibility, 1658. alkaline-earth borates, 1156. numbers, system of names, 2441. oxide systems, zirconia reactions, 1978.

302
quadratic rational forms, representation of integers, 1198. Biology, radiology, 1125. Biorthogonality, complex, for certain sets of polynomials, Bismuth and lead at 7 Mev, 3014.

Bisulfate ion, ionization, 3076. Bituminous, materials for spinning, preparation, 800. materials, uniform films, method of preparing, 628. Bivariate normal distribution function and related functions, AMS50.

Blackbody, design and construction, and its use in the

calibration of a grating spectroradiometer, 2513. Blade type abradant and the Schiefer abrasion testing machine, 382. Blankets, part wool, variability of wool content, 1571. Block designs, having a missing block, analysis for some

partially balanced, 953. incomplete, 2116. incomplete, analysis, 2343. incomplete, analysis of convariance, 2342. Block-type osmometer, design and performance, RP2931.

Blocks of symmetrical group divisible designs, 548. Blood, human, effects of plastic and steel surfaces on

clotting time of, 1003. human, platelets and red blood cells in vitro, adsorption of O, 2011. Blumenthal, conjecture of, Day's characterization of inner-product spaces, remark, 373. Bodies containing radioactive isotopes, safe handling of, H65. Body burdens and maximum permissible concentrations

of radionuclides in air and in water for occupational exposure, H69.

Bolometrie power measurements, a self-balancing direct- current bridge for, RP2776.

Bolt materials for service undergound, electrical measure- ments in the selection of, 1008.

Bolts, handmade, support the Capitol dome, 2577.

tightened, tensile forces, 344. Boltzmann equation from the statistical mechanical point

of view, 1922. Bomb, calorimeter, precise measurement of heat of combustion, Mono.7. calorimetric combustion, of compounds containing

carbon, hydrogen, oxygen, and nitrogen, 1645. Bombardment, electron cryostat for, and electron diffra- tion work, 2506. Bonding agents for high-temperature strain gages, 2474. Bonding of plastic teeth to heat cured denture base resins, 402. Bone char, current problems in refining, 984. process in sugar refining, 132. review of pressure drop across columns, 1243. Bone mineral, structure, 2383. Boolean geometry L., 403. Boor-Quartermaster snag tester for coated fabrics and

plastic films, evaluation, 1337. Borate minerals, 3057.

vitreous barium, radial distribution study, J 64A3,

229. Borates, alkali, molten, viscosity and electrical resistivity

of, 907.

alkaline-earth, 3059. binary alkaline-earth, 1156.

simple, immiscibility and surface tension, 2592. Boric oxide, the heat of formation, heat of reaction of diborane with water, RP2927.

Borohydride, sodium, reduction of aldonic lactones, 1868. Borohydrides, sodium and potassium, heat content of, from 0° to 400° C, RP2828.

Boron enhancing the hardenability of steel, action of, 851. needs well-made steel plus intelligent heat treatment,

199.

steels, 1642.

trichloride, heat of formation, RP2956.

Boron-treated, steel, temper brittleness, 1913.

steels, study of the impact properties, 1601.

Bose-Einstein condensation and the lambda transition in liquid helium, 2475. Boulders and cobbles in gravel deposits, geological appli- cation of extreme-value mel hods to interpretation, 1723. Boundary layer, and pipe, 1218.

transition, 1400. with zero pressure gradient, characteristics of turbulence, 968. Boundary layers, compressible turbulent, with heat transfer and pressure gradient in flow direction, J 63B1, 53. Boundary value problems for multiply connected domains,

404. Bounds, for eigenvalues of Hermitian matrices by the segment method, 1005.

greatest latent root of a positive matrix, 405. one-parametric family of matrices, 2663. Bourdon tubes, sensitivity and life data, 1864. Bragg-Gray cavitv principle for measuring energy dissi- pation, 1083. Brakelights and taillights, configuration, 1587. Branched-chain, higher sugars, 2476; 2903; 2904. Breaking velocities, strain energies, and theory neglecting wave propagation, 1277. Breathing oxygen storage dewars, 2038. Bremsstrahlung, and the photoelectric effect, 2968.

cross-section measurement for 50-kev electrons, 2477.

cross sections at the high-frequency limit, evaluation,

2551.

differential cross-section measurements for 0.5- and

1.0-Mev electrons, 1278. eleven- Mev thick target, 709. 500-kev, 2694.

inner, from V49

, 1368. 1-Mev, 993. photoelectric effect as inverse processes, 2905.

polarization measurements for 1.0-Mev electrons, 1643. Sauter approximation, high-frequency limit, 2961.

spectra, 1211. spectrum, electron, shape of high energy, 2755.

thin-target, differential cross-section measurement,

1676. Brick, de-aired, durability, 1683. masonry with and without caps and flashings, effects of weathering on certain mortars exposed in, 1927. Bridge, R-C, selective, note, 370. Bridge-balancing oscillator, high-stability, 1358. Bridged-T network, 181. Brief history of the National Committee on Radiation

Protection and Measurements, 2478.

Brief, look at the history of automation, 1585. note on the asymptotic expansion of error integrals, 1383. Bright rims in diffuse nebulae, 2479.

Brittle cermets, evaluation of tensile, compressive, torsional, transverse, and impact tests and correlation

of results, RP2895.

Britton-Robinson universal buffers, increased chemical

reactivity of the surface compared with that in the bulk volume of, RP2811. Broad and narrow beam attenuation of Ir102 gamma rays

in concrete, steel, and lead, 2480. Broad-band, coaxial stark cell for microwave spectroscopy,

358.

low-level, error-voltage detector, 914. Broadcast reception, worldwide standard frequency, 623. Broadcasting, television, measurement of a service area, 2190.

station, worldwide standard-frequency, power re- quirements and choice of an optimum frequency,

J 63D1, 35. stations, FM and television, variation with frequency

of the signal range, 347. Bromide, cesium, crystals, transmittance, 349. cesium, refractive indices, 527.

303
potassium, for infrared radiant energy, 812. thallium, iodide, refraction and dispersion, 1842. Bromotrifluoroethylene, vibrational spectrum, 1206. Bubble chamber, a large liquid hydrogen, 1984.

Buffer, solutions, surface reactivity, RP2811.

substance, triathanolamine, 1217. Buffers for pH standardization at 60° to 95° C, RP2797.

Building, and using dielectric amplifiers, 963.

brick, properties of, and effects of differences in raw

materials and methods of forming, relations among certain specifications, 528. code requirements for masonry, 945. Building codes, early history and development, 2095. how the National Bureau of Standards contributes, 1733.

noise control requirements, 2216.

Building, construction and maintenance, selected bibli- ography, BMS140, 3d ed.

finish materials, flame spread properties, 2565. Materials and Structure Reports (see list p. 63. Indexed under specific subjects), research in the U.S. before 1947, 1279. technology at the NBS, 200. Bulk crystallization in poly(chlorotrifluorethylene), ex- perimental and theoretical study of kinetics, J 63A1, 67. Bunsen flames, 207. Bureau of Standards comments on Loran communications,

2039. Butadiene-styrene copolymers, crystallization, 983. Butyrate, acetate, propionate radicals, heats of combustion of some peroxides and the heat of formation,

2148. G C3 radical in hydrocarbon flames, 1434. C3 molecule between 3600 A and 4200 A, spectrum, 1885. Cs 133

, narrow hyperfine absorption lines of, 2643.

Cable, lossy, attenuator pads, 754. Cables, coaxial, video signals, 2300.

Calcia-titania, revision of the phase equilibrium diagram

of the binary system showing the compound Ca4 Ti3O10 , RP2913.

Calcification in lysine deficiency, 2040. Calcium, aluminate hydrate mono, observations on, RP2777.

aluminate hydrates, a study, RP2877.

hydroxide, a thermochemical study of the reaction

of, RP2785. magnesium precipitations, removal of manganese

prior to, 814. phosphates, precipitated basic, pyrophosphate formation upon ignition, 1465.

silicate hydrates, 1172. treatment on solubility and calcium uptake of synthetic hydroxyapatite and rat molar enamel,

2528. Calculated calibration points for negative ion appearance

potentials, 2481. Calculating error function of a complex variable, formulas,

241. number of chain scissions in the photochemical degra- dation of solid polymers, equation, 2455. Calculation of, an optical merit function and its derivatives with respect to the system parameters, 2041. beam flux, use of zonal constants, 887. cryoscopic data, 2042. energy dissipation by gamma radiation near the in- terface between two media, 2043. gaseous heat conduction in dewars, 2482. peaked angular distributions from legendre polynominal expansions and an application to the multiple

scattering of charged particles, 659. Calculation of departures of radio wave bending from

normal, J 64D3, 259. equilibrium composition and thermodynamic properties of dissociation and ionized gaseous systems,

2632; 2988. 304

field in a homogeneous conductor with a wavy inter- face, 3067.

properties of gases at elevated temperatures 2664.

scattering cross sections, variational 617.

spatial distributions by semi-asymptotic methods:

penetration and diffusion of X-rays, 509. Calculations, of ionospheric reflection coefficients at very low radio frequencies, 2044. systematic, of gamma-ray penetration, 847. transverse current loss in buried wire ground systems,

2665.

Calculus, of variations, applications of the theory of quadratic forms in Hilbert space, 195. variations, elementary introduction, 23. Calf skin squares, influence of temperature on the adsorption of chrome (Cr2 03), 2159.

Calibration, absolute time, intermittent-action camera, J 64C2, 159. accelerometer, high-speed stroboscope for, 1031. airplane camera, source of error in various methods,

1878. airplane cameras, 2045. audiometers, 31. calculated, points for negative ion appearance potentials, 2481.

capacitor, by step-up methods, J 64Cl, 75. commercial field-strength meters, 4070. condenser microphones, 1114. grating spectroradiometer, design and construction

of a blackbody and its use, 2513.

line standards of length and measuring tapes at the NBS, Mono. 15. liquid-flowmeter, techniques, 2613.

liquid-in-glass thermometers, C600.

portable Swedish free-air chamber equipment at the U.S. National Bureau of Standards, 1644.

precision airplane mapping cameras, 32. shock and vibration pickups, 2046. spectrometers from 2 to 16 microns, vibration- rotation structure in absorption bands for, J 64A1, 29; Mono. 16. thermocouples at low temperatures, 2483. VHF field-intensity meters, 151. with an inductive voltage divider bride, TN57

(PB161558).

Calibrator, detector, microphone condenser, 2348. wide-range, for vibration pickups, 911. Calorimeter, adiabatic, for the range 30° to 500° C, RP2848. bomb, precise measurement of heat of combustion, Mono. 7. dry, static, for rf power measurement, 2419. microwave, 1236. Calorimetric, and thermometric procedures, comparison of crvoscopic determinations of purity of benzene,

2062. combustion in a bomb of compounds containing car- bon, hvdrogen, oxygen, and nitrogen, 1645. determination of the power in a 1400 kev X-ray beam, 2047. Calorimetry, adiabatic, automatic temperature regulation and recording, 2035. combustion with fluorine: constant pressure flame

calorimetry, J 64A1, 49. electrochemical, 2538. heat units and temperature scales, 1355. Camera, calibration, airplane, sources of error in various methods, 1878. intermittent-action, with absolute time calibration, J 64C2, 159. tipping, prism effect, and tangential distortion, 2264, Cameras, airplane, calibration, 2045.

airplane mapping, 32. Can the scales of atomic weights and nuclidic masses be

unified? 2906. Can we legislate ourselves into radiation safety? 1280. Candlepower standards, gas-filled, 2860. Canonical ensemble, virial expansion for finite closed systems, 2077; 2078.
Cantilever beams, tapered, computed on SEAC, 738. Capacitance, low, power supply, 1391. measurement, absolute, 2647.

Capacities, flow, of pneumatic components, determination and correlation of, C588. plumbing drains, 2489. Capacitor calibration by step-up methods, J 64C1, 75. variable, calibration with an inductive voltage divider

bridge, TN57 (PB161558).

Capacitors and diodes, experimental rapid access memory,

392.

conical coaxial, and their advantages, J 63C2, 87. Capacity, plumbing stacks, 1281. requirement of a mail sorting device, RP2948.

requirement of a mail sorting device: II, J 63B2, 79. Capillary, shape, effects on flow characteristics and degradation of polymer solutions, RP2839.

viscometry, 2047A.

Carbide, titanium, type cermets at elevated temperatures,

physical characteristics, 1445. Carbohydrate derivatives, infrared spectra, RP2772.

Carbohydrates, carbon-14-labeled, RP2800.

general-purpose apparatus for preparation of tritiumlabeled, J 63 A2, 177. tritium labeled, assay of, J 63 A2, 171. Carbon, adsorbents, oxygen chemisorption, 1438. black differentiation by electrical resistance of vulcanizates, 408.

dioxide, reaction of portland cement with, RP2858.

disulfide, infrared spectrum and rotational constants,

1932.

electrons in, range straggling of high-energy, 2279. formation in hydrocarbon flames, isotopic tracer study, 2018. graphite at 450° C, reaction of carbon monoxide, 2717. hydrogen, oxygen, and nitrogen, calorimetric combustion in a bomb of compounds containing, 1645. monoxide and atomic nitrogen, luminous reaction, 2183. monoxide and atomic oxygen, luminous reaction be- tween, 866. monoxide from 2.3 to 2.5 microns, emission spectrum, RP2883.

monoxide, infrared spectrum, 516. monoxide in studies of air pollution, 1309. monoxide, liquid, 3013. monoxide on tungsten, 2888. monoxide, velocity of light from the molecular constants, 1574. monoxide with graphite carbon at 450° C, reactio i. 2717. near threshold, photoproduction of neutral mesons,

2250.

stable, isotope analysis of optical spectroscopy, 1892. Carbon and hydrogen, determination of copolymer composition by combustion analysis, J 64A2, 157. Carbon-14, beta-ray standard, benzoic acid-7-C u in toluene, for liquid scintillation counters, J 64A2,

143. carboxy-labeled polysaccharides, RP2886.

labeled cyanide, determination of reducing sugars and

reducing end groups in polysaccharides by reaction, 2517.

labeled cyanide, preparation, 2262. Carbonate, sodium, in photographic developers, note on

estimation, 1238. Carbonates, manganous and ferrous, thermal decomposition, 1960. Carbonyl sulfide, infrared spectrum, 2162. Carboxyl, aldehyde, pentosan, and degree of polymerization data on the ICCA "standard" pulps, 2890. Cardiac, output determination by the dye-dilution method, an improved cuvette densitometer for, 650. output, evaluation of a new cuvette densitometer for determination of, 714. Career opportunities in the Government, 2484.

Carrier frequency dependence of the basic transmission

loss in tropospheric forward scatter propagation, TN53 (PB161554).

Cascade electrons and photons, energy spectra, RP2824.

Cascade-binary counter with feedback, 326. Cascade-connected, attenuators, 33. variable attenuators, mismatch errors, 2993. Cassiopeiae, gamma, variations, TN21 (PB151380).

Cast iron, nodular graphite in, experimental production,

444. Castables, ^refractory, preparation and some properties, refractory, strength, elasticity, and other related properties, 2536.

Castiloa and Hevea rubbers, 160. Castings, gold, effectiveness of vacuum investing in the

elimination of surface defects, 697. Catalysis of the ortho-parahvdrogen conversion, 2048. Caterer problem, solution, 1099. Cathode, film studies by the drainage method, 1282.

studies, high-power pulser aids, 1029. Cathode-coupled oscillator, 62. Cathode-rav tubes, electrostatic deflection plates, J 64C2,

103. Cathodic, protection, polarization, 143.

steel in a high resistivity environment, current and

potential relations for, J 63C1, 37.

steel in salt water, current and potential relations, RP2833.

Cationic detergents in water, turbidity and viscosity measurements on, RP2778.

Cavities, large high-Q, excitation and separation of pure

high-order modes, 1708.

limit of spatial resolution of refractometer, J 64D1, 65

Cavity, characteristics, time-dependent, 2636.

ionization as a function of wall material, RP2842.

ionization theory of, 1247; 1606.

ionization, theory including the effects of energetic secondary electron, 1229. resonator dielectric measurements on rod samples,

2907. techniques for permeability measurements in the VHF

region, 1283. Cd116 isomers, decay of, 569. Ceguera para el color y teorias de la vision cromatica, 201.

Cell, dry, standards broadened—now includes mercury-,

air-, and flat-type cells, 1321.

Cells, airglow, 2640.

dry, and batteries, specification, H71.

dry, gassing, 2359.

photoflash, standard test, 1506.

resistance, during current flow, 141. standard, portable potentiometer and thermostated

containers, 1450.

Cellular, concretes. Part 1. Composition and methods

of preparation; Part 2. Physical properties, 964.

units, solderless electronic assembly, 830.

Cellulose, acetate films, degradation, 2924. acetate propionates, 237. degradation in a vacuum with ultraviolet light, RP2841.

determination of aldehyde, 1308. periodate-oxidized, 314. water evaporation, 547. Cellulose and, polysaccharides, 2403.

solvent solutions, 112. Celluloses and aldoses, reaction of sodium chlorite, 1473.

Cellulosic materials, thermal degradation, RP2853.

Cement, 1284.

analysis, 937.

asbestos, pipes, 998. hydrated, 2639. manganese in, flame photometric determination, 1930. note on the oxyquinolate determination of magnesium

oxide in, 925.

paste, portland, some effects of aging on the surface

area, J 64A2, 163. pastes and mortars by the alkali-aggregate reaction, 2699. portland, chemistry, 327. portland, flame photometric determination of stron- tium, 1346. 305
Portland, hydrated, some factors, affecting the sur- face area, RP2806.

Portland, improvements in flame photometric deter- mination of sodium in, 736. Portland, magnesium oxide in, 2893. Portland, pastes cured at elevated temperatures and

pressures, properties, 1826. Portland, reaction with carbon dioxide, RP2858.

silicate, dental, 20.

silicate: how to select and use them, 2299; 2756.

silicate, method of mixing in a closed container to prevent effects of exposure to atmosphere 827. Cemented piezoelectric accelerometers, 660. Cements, ceramic-type strain gage, 2739.

dental, 1306. Portland, a sulfate susceptibility test, 11. Portland and high-alumina, during hydration, 2768. Portland, strontium oxide content, 2832.

resin and posterior-type direct-filling resins, 1854.

silicate, and zinc phosphate, 2873.

silicate, deterioration in the tropics, 217. Central notations for the revised ISCC-NBS color-name

blocks, RP2911.

Radio Propagation Laboratory, 2049. Radio Propagation Laboratory exponential reference atmosphere, J 63D3, 315. Ceramic accelerometer of wide frequency range, 175. coated and uncoated specimens of Inconel and stainless steel, 3053. coated Inconel and type 321 stainless steel, 3092. coating on the creep behavior of some high temperature alloys, 3072. coatings for nuclear reactors, 1285. coatings for thermocouples, development and evaluation, 1674.

coatings, thickness gage, 13. materials, specular-gloss measurement, 1886. metal materials, 1266. oxide single crystals, plastic deformation, 1108; 2253. type strain-gage cements, 2739. X-band cavity resonators, fabrication techniques,

2561. Ceramics, a survey for nuclear reactors, 12. cermets, properties of high-temperature, Mono.6. vacuum tube envelopes, survey of the application, 1604. Ceramists, compilation of phase diagrams of interest, 1656.

distribution of phase diagrams of interest, 1318. Cerenkov counters, fast coincidences, 447. Cerium141 and neodynium147

, alignment, 1255. Cermet, chromium boride-nickel, coating, protection of low-strategic alloys, 1463. Cermets and ceramics, properties of high-temperature, Mono.6.

titanium carbide type, at elevated temperatures,

physical characteristics, 1445. Certain Fourier transforms of distribution, 202; 965.

series expansions involving Whittaker functions and

Jacobi polynomials, 1424.

Certification and specifications, dental materials, annual

for 1943, 1307.

Certified reference materials, 3078A. Cesium bromide crystals, transmittance, 349. bromide, refractive indices, 527. iodide crystals, growth and infrared transmission,

460. iodide in the far infrared region, transmittance and

reflectance, 2852.

iodide, optical properties, 1436. iodide prism, 1072. iodide prism, infrared measurements, 742. iodide prism, infrared spectrometry, 744. iodide prisms to 50 microns, 1551. Cesium-131, radiative electron capture, 1834. Cesium-137 and cobalt-60 gamma rays with a free-air chamber, measurement of, J 64C2, 87.

CH flames at atmospheric pressure, rotational and

vibrational "temperatures" of, 816. OH, and HCO in flame spectra, using deuterium as tracer, mechanism of formation, 868.

solar spectrum, J 63A1, 19. system of, 1625. Chain block design, 852. block designs with two-way elimination of heterogeneity, 966. depolymerization, kinetics. 474. molecules, flexibility, sedimentation equilibrium, 2296.

ratio, statistical, method for estimating relative volumes of mail to given destinations, J 64C1, 37. reactions of frozen radicals, 3030. suspended, modes of viration, 770. Chaines de Markoff dans les ensembles abstraits et applications aux processus avec regions absor- bantes et au probleme des boucles, 1286. Chamber, a large liquid hydrogen bubble, 1984. Change in the inversion spectrum of ND3 from resonant to nonresonant absorption, 661.

free energy with pressure of the reaction nephelene +

albite = 2 jadeite, 203. Changes, in agar-agar type duplicating material and I agar-agar on heating and storage, 2050.

sign of sums of random variables, 662. Char, bone, review of pressure drop across columns, 1243.

Characteristic energy loss of electrons in aluminum,

temperature dependence, 2798. energy losses of electrons in solids, 1278.

functions, analytic, 496.

roots of quaternion matrices, 967.

size of airglow cells, 2807.

Characteristics, and atmospheric noise from 1 to 100 Kc/s, 2052. cryogenic of wire resistance strain gages, 2073.

cutting, of dental burs as shown by high speed photo- micrography, 2076.

deposits, 2908.

Institute for Numerical Analysis computer, 34. magnetic attenuator at TJHF, 663; 902. metal-clad laminates, 2053.

outline of, an image-forming system, 1801. some insulations or liquid oxygen transfer lines, 2054. turbulence in a boundary layer with zero pressure

gradient, 968. ultrasonic vibrations, 2055. Characteristics of VLF propagation using atmospheric waveforms, 2760. Characterization of kaolinite, halloysite, and a related mineral in clays and soils, criteria, 420. high-speed impact behavior of textile yarns, 2909. Charge-storage pulse-height analyzers for use with pulsed

accelerators, 2485. Chart, average, operating characteristic, 588. coupling, for solenoid coils, 41. speeds design of feedback amplifiers, 410. TEii model piston attenuator, 664.

test, power, 268. Charts, control, may be all right, but—, 676. Chebyshev and polynomial approximation, derivative, 786. polynomials in the solution of large-scale linear systems,

411. polynomials in thin film computations, use, J 63 A3,

297. Checking money-value graduations on a computing scale, 204. prepackaged commodities, H67.

Chemical analyses, surface area, and thermal reactions of natural graphite, and refractoriness of the ashes,

665. color constitution, 1289. combination of the characteristic energy loss of elec- trons, effect of, 997. compounds, optical rotation of polarized light, 285. constitution of dyes, absorption spectra, relation. XXVIII. The hydration of Azo dyes in organic

solvents, 1543. 306
constitution of dyes, absorption spectra, relation. XXII. Cis-trans isomerism in thioindigo dyes,

341. constitution of dyes, absorption spectra, relation. XXIV. Absorption spectra of some thioindigo dyes in sulfuric acid, 342.

data, interpretation, 579. education in Switzerland, 969. elements in astronomical spectra, lines, 1758. equilibrium among molecules, atoms, and atomic ions considered as clusters, RP2916.

kinetics, stochastic processes, 2898.

kinetics, the application of the theory of stochastic

processes, 2805. methods for separating and determining metals con- tained in platiniferous materials, 668. physical properties of chrome-tanned leather and the

election of sampling location, study of the

variation, 558. physical properties of split and unsplit chrome-tanned

leathers, variation, 601. physical properties, review, direct and indirect filling resins, 688. physics, and engineering measurements, how statistics improve, 68. reactions and shock waves, 2325.

reactivity at the surface compared with that in the bulk volume of buffer solutions, RP2811.

research, autoclaves in, high pressure gas handling equipment, 2154. spectroscopy, 35. structure and stability relationships in polymers, 2910. Chemical analvsis, GR-S bv complete solution procedures,

666. GR-S by complete solution procedures. Gross constituents in GR-S containing soap, 667. using linear calibration curves, 2328. Chemicals, reagent, American Chemical Society specifications, 1474. Chemiluminescence as a tool in the study of liquid flow boundaries, 1646.

in the system atomic sodium plus atomic hydrogen,

2486. Chemisorption, oxygen, on carbon adsorbents, 1438. Chemistry, analytical, 138.

crystal, symposium, 215. macromolecular, 1394. organic phosphorus, 2494. physical of synthetic rubbers, 1107. Portland cement, 327.

statistical methods, 1896; 2779.

Chilte and guayule rubbers, 119. Chloride, manganous, tetrahydrate at very low temperatures, spin-spin absorption in chronic methylam- monium alum, 1887. manganous, tetrahydrate, spin-spin, 1888. molten, electrolyte, theoretical electromotive forces

for cells containing a single solid, 1957.

silver, silver, electrode, standard electrode potential, 1895. Chlorine and nickel, above 1,100° K, kinetics of the reac- tion between, 2174. between 1,200 and 1,700° K, kinetics of the high temperature heterogeneous reaction, 2608. Chlorine monoxide, flash photolysis, 2357.

Chlorite, sodium, determination of glucose, 1310. sodium with some aldoses and modified celluloses, reaction, 1473. 4-Chloro-4'-aminodiphenylsulfone, dissociation of, RP2794

Chlorotrifluoroethylene, vibrational spectrum of, 893. Chromatic aberration, secondary, 2295. Chromaticity diagram, 918. Chromatographic, paper, analysis for collagen and collagen

derivatives, 1597. Chromatography, adsorption, separation of isomeric polyphenyls, 2752.

Chrome-tanned leathers, split and unsplit, properties of 601.

steer hides, influence of splitting on the strength, 468. variation of the physical and chemical properties^ Chromic, methylamine alum, 1057. methylammonium alum and manganous chloride tet- rahydrate at very low temperatures, spin-spin absorption, 1887. methylammonium alum as a thermometric substance,

absolute temperature below 1° K, 2009. methylammonium alum, spin-spin relaxation in very low temperatures, 1889. Chromium, boride-nickel cermet coating, protection of low-strategic alloys, 1463. cobalt alloys, physical properties, 2687. gun bores, 1647. plating of gun bores, 1648. potassium alum, 1067. Chromosphere, solar, 2927. Chromotographic, quantitative, procedure for determining

_ dextrose in sugar mixtures, 2276. Cinchonine method for determination of lignosulfonates

in vegetable extract blends, 1979.

Circle theorem of hydrodynamics, 1084.

Circles, precise, graduation of, 862.

Circuit, design, 2283. high-speed memory, pulse generator, 1827. junction transactor, 749. parameters, effect of variation of, on the excitation of spectra by capacitor discharges, 696.

pulse, accurate time-modulated, 646. resistance diode bridge, for temperature control, TN34 (PB151393) . simultaneously recording the range, amplitude, and

duration of radar-type reflections, 176. Circuitry, one-megacycle, one-microsecond adder, 1596.

Circuits, audio-frequency power amplifier, a survey, 187. coincidence, millimicrosecond, 1779. communication, effect of echo on the operation of high

frequency, 2810.

direct-coupled, bias supplied, 962.

electronic, 238; 2500.

incidence, VHF oblique, 2773. modified resonant, match impedances, 92. preferred, manual with engineering notes, 1113.

preferred, NBS, program, 1412. VTM, 168. Circulants, integral, unimodular, 1567. unimodular, classes of positive definite, 2057.

Circular, cylindrical enclosure, right acoustic impedance of, 941.

disks containing the eigenvalues of a matrix, note, 2650. punch, smooth, indentation pressure, 1363. Circulation in the dog using a mechanical left ventricle, a method for the study of, 920.

Civil enineering, 2824. Clamp for handling radioactive liquids, 1649. Clamp-on-microammeter measures a-c current, 2056. Clamp-type alternating-current microammeter, 2347.

Class of mean value functions, 1. Classes of matrices and quadratic fields, 205; 412. positive definite unimodular circulants, 2057.

Classification, and nomenclature for standards of measurement, 2486A.

conformers: conformations of the pvranoid sugars, J 64A2, 171. Clay tile, moisture expansion of, 1058. Clays, soil, and related materials, electron microscopv,

439. Climate, radio-refractive-index, near the ground, J 63D3,

259. Climatic variation of absolute humidity, note, 1991. Climatology, of ground-based radio ducts, J 63D1, 29. radio, meeting on, 2564.

Clinical, dextrans by periodiate oxidation and isotope

dilution techniques, structural analysis, 2319. thermometers, aging changes, 385. 307
Clock, atomic, 148; 196. Clocks widely separated, precise time synchronization, TN22 (PB151381).

Closure to discussion by Prof. Maxwell of Stress and

strain at the onset of crazing of polymethyl

methacrylate at various temperatures, 669. Cloud chamber, high pressure diffusion, construction and

operation, 568. Clouds hydrogen, interstellar neutral, radio observations,

1836. space-charged, electron optical properties, 53. Clues to ionospheric conditions in the southern auroral

zone, 1650.

Clusters, chemical equilibrium among molecules, atoms, and atomic ions, RP2916. C02 , nonpolar gas, 1074. Coastal deviation of high-frequency radio waves, measurements, J 64D1, 57. Coater, dip, improved, 1033. Coatings, for space vehicles, 2910A.

organic, abrasive jet method for measuring abrasion

resistance, 1249.

Coaxial, cables, video signals, 2300.

capacitors, conical, and their advantages, J 63C2, 87. stark cell, broad-band for microwave spectroscopy,

358. Cobalt alloys, chromium, physical properties, 2687. Cobalt-60, backscattering of, 959. cesium-137 gamma rays with a free-air chamber, measurement of, J 64C2, 87. Cobbles and boulders in gravel deposits, geological appli- cation of extreme-value methods to interpretation, 1723. Code, checking, computer aids, 413. orthonormalizing, multiple-purpose, its uses, 921.

safety, new, for portable metal ladders, 2374. Codes, and standards, governmental aspects, specifications, 1880.

building, early history and development, 2095.

building, how the National Bureau of Standards

contributes, 1733.

building, noise control requirements, 2216.

color, safety, 1481; 1861. Coding, automatic, principles, 1637; 2466.

Coefficients, for allocation problem, 2808.

certain infinite products, 853.

certain modular forms, existence of identities, 1797.

certain modular forms, generalizations of identities, 1720. polar complex interpolation, 36. powers of rj (X) table, 1605. reverberant sound fields, measurement of correlation, 1399.

Coils, solenoid, coupling chart, 41. toroidal, high-frequency magnetic permeability measurements, 2584.

Cold, cell, liquid helium, for use with an X-ray diffrac- tometer, RP2907.

fluids, valve for, 1570. Collaborative study on the cinchonine method for determination of lignosulfonates in vegetable extract

blends, 1979. Collagen, leather, and other organic and fibrous materials, heats of wetting, 1028.

derivatives, paper chromatographic analysis, 1597.

heat, degradation, 2511.

hide powder, amide nitrogen of, 645. modified collagen, 1159. modified, and other materials, heats of wetting, 2149.

reaction of nitrous acid, 1837. studies of the polar amino acid content, 841. tendon shrinkage, 120. Collagen and leather, influence of temperature on the absorption of water vapor, 74. physical and physico-chemical constants, 510.

pores, 1449.

specific heats, 1502.

Collection of ions produced by alpha particles in air, 2488.

Collision, path from the earth to the moon in the restricted problem of three bodies, 359.

liquid drops and rigid steel spheres, pits in metals J 64A1, 61. Collisional relaxation of a system of harmonic oscillators 1847; 2235. Collodion membranes, sorption of dextran to, 832. Color, blindness and theories of color vision, 201. chemical constitution, 1289.

codes, safety, 1481; 1861. computer defines, 2913. demonstrations, 3046.

description, 2080.

differences, 3078.

gloss and haze, measurement of, 760.

light, a new point of view in the measurement, 1989.

light, measurement, 2609; 2627. measurement in industry, 2197. mixture functions studied by means of a pair of metameric grays, observer difference, RP2825. name blocks, revised ISCC-NBS, central notations, RP2911.

perceptions, entroptic, of the macular pigment by

observers of normal and color-defective vision according to the three-components theory, 1706. phase contrast microscopy: requirements and appli- cations, 37. rendering properties of fluorescent lamps, specifica- , tions of, 134; 833. rendition in fluorescent sources of illumination, 1651.

scales, uniform, progress report by Committee of Optical Society of America, 1459A.

specification, 52. stability of direct filling resins, 854.

television, 38. television, present status, 154. three, achromats, glasses for, 3043. turbidity of sugar products, 970.

vision and colorimetry, 2500.

vision color blindness and theories, 201. Colorfastness of textiles, international methods for testing, 1375.

textiles tests for, 850. Colorimetric data to Munsell renotations, mechanized

conversion, 2633. determination of tetrachlorohydroquinone, 670. Colorimetry and color vision, 2500.

precision spectrophotometry, 2487. spectrophotometric, propagation of errors in, 804. tristimulus, propagation of errors, 2266.

Colors, dark, extension of Munsell renotation system,

1710. new federal standard, 2213. Combination, bands of ethylene, 206.

crossed-field and time-of-flight mass spectrometer,

360. Combinatorial analysis of a mail sorting device, J 63B2, 79. Combined translational and relaxational dispersion of sound in gases, 971. Combustion, analysis for carbon and hydrogen, determi- nation of copolymer composition, J 64 A2, 157. Bunsen flames, 207. calorimetry with fluorine: constant pressure flame

calorimetry, J 64A1, 49. heat of, precise measurement, with a bomb calorimeter, Mono. 7. net heat, of aviation gasoline and its correlation with

other properties, 2646. Comments on a, recent paper by Deresiewicz on plane waves in a thermoelasticsolid, 2058. attenuation versus frequency characteristics, 2059. capacites of plumbing drains, 2489. structure of l,l,l-trifluoro-2-butyne, 2911. Commercial, field-strength meters, calibration, 407. sugar solutions, light scattering, J 63A3, 205.

tires, measurement of treadwear, 761. Commission III on ionospheric radio, world-wide soundings committee, 2490. 308
Commodities, checking prepackaged, H67. Communicution, arctic, conference on, J 041)1, 73.

circuits, effect of echo on the operation of high fre- quency, 2810.

circuits, high-frequency, 3073.

conditions, high-frequency, 2127. experimental equipment for, utilizing meteor bursts, 2117.

line Wires, pretied tie, 2432. meteor-burst, transmission error function, 2674. narrow-band, of binary coded messages in fluctuation

noise, 915. optimum frequencies for outer space, J 64D2, 105. theory aspects of television bandwidth conservation, TX25 (PB151384).

via meteor bursts, 2491. Communications, air, at frequencies above 50 Mc, 540. air-to-ground, at frequencies above 50 Mc, gapless coverage, 457. intermittent, with a fluctuating signal, 2163. Loran, Bureau of Standards comments, 2039. marine radio, propagation characteristics of the fre- quency band 152-162 Mc, 1945. ^--commutative matrices, space of, J 64B1, 51. Commutativity in finite matrices, 2060. Commutator for periodically changing the direction and

magnitude of direct currents, 1652. Commutators of A and A*, 1653.

matrices, some remarks, 1145. Commuting bilinear transformations and matrices, 1654. Compact, microwave refractometer for use in small aircraft, 2415. multi-anvil wedge type high-pressure apparatus, J 63C1, 59. Comparative, characteristics of medium-priced fully auto- matic computers for statistical applications, 2061. 100 mc measurements at distances far beyond the

radio horizon, 972. strengths of some adhesive-adherend systems, 208. survey of spectrophotometers in the 210-760 m/z

region, 625.

tests in a single laboratory, 39. Comparator, and recorder, high precision automatic fre- quency, 1356.

noise, for microwaves, 773. Comparing outputs from precision time standards, 209. Comparison, of absolute intensities of [01] 5577 in the

auroral and subauroral zones, J 63D1, 19. amplitude and angle modulation for narrow-band communication of binary-coded messages in fluctuation noise, 915. annual mean solar and lunar atmospheric tides in barometric pressure, as regards to their world- wide distribution of amplitude and phase, 1586.

characteristic energy losses of electrons with the

fine structure of the X-ray absorption spectra, 1655. cryoscopic determinations of purity of benzene by

thermometric and calorimetric procedures, 2062. CW field intensity and backscatter delay, 361. experimental and theoretical relations between

Young's modulus and the flexural and longitudinal resonance frequencies of uniform, bars, J 64A2, 147.

first, second, and third approximations in Bacher and

Goudsmit's theory of atomic spectra, 2492.

ionization produced in air by alpha particles near 5-Mev and by beta particles, 2912.

insulating materials, 2416. mechanical properties of flat sheets, molded shapes, and postformed shapes of cotton fabric-phenolic laminates, 2063. meteor activity with occurrence of sporadic E reflec- tions, 2. methods for evaluating trends in time series of tropospheric radio field strength data, 362. methods for measuring the tensile and tear properties

of plastic films, 1290.

phase difference and Doppler shift, measurements for studying ionospheric fine structure using earlh

satellites, 2493. sodium hydroxide and sulfuric acid methods for

wave, yfi. variously derived solar indexes, 40. X-ray standards, 916; 1230. Comparison theorem for eigenvalues of normal ma ( l in - 1231. Compatibility equations, of strain rate and strain, RP2813.

Compilation of phase diagrams of interest to ceramists

1656. Complementary use of nuclear magnetic resonance and

infrared absorption studies in organic phosphorus

chemistry, 2494. Complete night of vertical-incidence ionosphere soundings

covering frequency range from 50 Kc/s to 25 Mc/s, 2064. Complete sequences and approximations in normed linear spaces, 2065. Completely^continuous normal operators with property L, Complex,^a^unents, tables of the exponential integral biorthogonality for certain sets of polynomials, 975.

plane, formulas for inverse osculatory interpolation

in the complex plane, RP2792.

plane, formulas for numerical differentiation, 453. systems, some aspects of prediction in the study, 2225. Components, for mechanized production, 1291. microwave, 258. pneumatic and systems, pressure drop, 1456. waveguide, electroforming of, for the millimeter- wave-length range, C587. Composition, of apparent shearing forces during shear

degradation of polymers, 976.

resistors, noise, 1416A.

resistors, proposed index of current noise, 1241. Compound semiconductors, 2495. Compounds, and metals, energy losses, electron characteristic, 1699.

intermetallic, electrical and optical properties, 1007:

1330.

intermetallic, energy loss, 2937.

intermetallic, photoeffects, 1444. semiconducting intermetallic, 823. two urea addition, analysis of dielectric loss, 2454. Compressibility, binary alkali borate and silicate glasses at high pressures, 1292. binary alkaline-earth borate glasses at high pressures, 1658.

factor, density, specific heat, enthalpy, entropy, free energy function, viscosity, and thermal conductivity of steam, 1657.

liquid normal hydrogen from the boiling point to the

central point at pressures up to 100 atmospheres,

1173. Compressible turbulent boundary layers with heat transfer and pressure gradient in flow direction, J 63B1,

53. Computation, capacity of a cube, 779.

cyclic cubic units, RP2783.

effective intensity of flashing lights, 2066. high-speed, of ideal gas thermodynamic functions, 1357.

ideal gas thermodynamic functions, high-speed machine, 1030. Laboratory, scientific teamwork, 819.

pitfalls 1809. vibration modes and frequencies on SEAC, 1293. x\ 2877. Computational, experience in solving linear programs, 672. methods for a digital logic machine, 1061. problems in algebraic number theory, 1873.

309
Computations, automatic, with power series, 1683. high-speed, in the kinetics of free-radical degradation,

2587.

thin film, Chebychev polynomials in use, J 63A3, 297. rational numbers, subroutine, 1603. Computer aids to code checking, 413. analog for radioactive fallout prediction, 1616.

defines color, 2913. development and applications, survey, 2332.

digital, experiments in processing pictorial information, 2119.

electronic, to reduce weathering test data, 2858.

Institute for Numerical Analysis, characteristics, 34. memory uses conventional C-R tubes, 673. NBS Western automatic (SWAC), design features of a magnetic drum memory, 424. new multiple, system, PILOT, 3016. Computers, 2496.

allpurpose, sieve problem for, 885. automatic, development, 1675.

digital, finding chemical records, 2122.

digital, system design of, at-the NBS: methods for high-speed addition and multiplication, C591,

Sect. 1. electronic, aiding management control, 441.

electronic digital, analysis of atomic spectra, 1624.

electronic, European experience, 1336.

electronic, in air traffic control, role, 2380.

electronic, new frontiers in business management, 488. high speed, generation of Bessel functions, 2140. high-speed, in statistics, some examples, 2302. medium-priced fully automatic, 2061. network of, to meet deadlines, organizing, 2240.

scientific, programming, 1820.

statistics, use, 2404. two digital, interconnection, 1536. Computing, high-speed, use of continued fractions, 612. hypergeometric series, programs, 1118. multiple integrals, some Monte Carlo experiments,

1875. operating characteristics of single sample plans, 563. Concentration dependence of the sedimentation constants

of flexible macromolecules, 1174. Concrete, alkali-aggregate reaction in, physical-chemical

studies, RP2780.

aluminum, and lead in the range 275 to 525 kilovolts, X-ray attenuation, 1582. aluminum, isotropic sources through, penetration of gamma rays, TN11 (PB151370).

beams, reinforced, diagonal tension 222. beams, reinforced, flexural cracks, 2566.

cellular, preparation, 964. cylinders during freezing and thawing, 167. evaluation of width of cracks, at the surface of rein- forcing steel by means of tensile bond specimens,

2113. heavy steel-aggregate, 1678. high rates of loading, properties, 1824.

lead, attenuation of 86- and 176-Mev synchrotron

X-rays, 1635A.

"no-fines", 190. properties of, 694.

reinforced, cracking of, flexural members, 1665.

shielding, betatron X-rays, 961.

steel, and lead, broad and narrow beam attenuation

of Ir192 gamma rays, 2480. X-rays and gamma-rays, absorption, 1250. Concretes, insulating, 1742. Condensation interfaces in two-phase flows, 2067. Condenser microphone as a displacement detector calibrator, 2348. Condition, for radiation from a solar plasma, 414. certain matrix, 149. certain matrices, II, 1175. Conditions at the ionization and shock fronts in collisions of gas clouds—bright rims in diffuse nebulae, 2496A. Conductance of slots, 1796.

Conductive flooring, or hospital operating rooms, J 63C2

125; Mono. 11. Conductivity, electrical; tables of transport integrals, C595.

finite, propagation constant in rectangular wave

guide, 1120.

fluid contained in a cylindrical vessel, measurement

2233. plasmas to microwaves, 2914. thermal, of solids at low temperatures, RP2805.

thermal; tables of transport integrals, C595.

Conductors, distribution, and telephone, wind-induced

vibration, 2868.

pore, properties, 1461. Conference, arctic communication, J 64D1, 73. National, on Weights and Measures. See National Conference on Weights and Measures.

photonuclear reactions, 2497. quantum interactions of the free electron, 1659.

scientific, proposed standard for facilities, 2434. Confidence, and tolerance intervals for the normal dis- tribution, 674.

intervals for a proportion, 1660.

intervals for the expectation of a Poisson variable 2915. Configuration, interaction to the H3 complex, application, 2027.

taillights and brakelights, Reports of Night Visibility Committee, Highway Research Board, 1587. Configurations for automatic mail sorting equipment,

analytic comparison, J 63B2, 83. Conformations, of the pyranoid sugars: classification of conformers, J 64A2, 171. pyranoid sugars. II. Infrared absorption spectra

of some aldopyranosides, J 64A3, 239. Congruences, for the coefficients of modular forms and for the coefficients of j (t), 2498.

coefficients of modular forms and some new con- gruences for the partition function, 2068.

coefficients of modular forms, further identities, 2573. new, for the partition function, modular forms, 2068. Conical coaxial capacitors and their advantages, J 63C2,

87. Connections between probability theory and differential and integral equations, 278. Conservation, parity, scintillation counting in experiments,

2749. Consistometer, grease, constant shear rates, higher vis- cosities, 245. Constant temperature liquid helium bath and reproducibility of resistance thermometers, 2916. Constant-amplitude oscillator, 210. Constant-level device for liquids, 415. Constants, elastic, of synthetic single crystal corundum at room temperature, J 64 A3, 213. equation for atmospheric refractive index at radio

frequencies, 855. Constitution, and Declaration of Independence of the U.S., preservation, 288.

color and chemical, 1289. Construction, and application of a class of modular

functions, 2069. design of a blackbody and its use in the calibration

of a grating spectroradiometer, 2513. design of a liquid hydrogen temperature refrigeration system, TN38 (PB151397).

floor, wall, and door, sound insulation, BMS144, 2d

Suppl. maintenance, building, selected bibliography, BMS140

3d ed. materials of: their properties and methods of test, 2625. operation of a high pressure diffusion cloud chamber.

568. operation of thoria resistor-type furnaces, 328. use of subroutines for the SEAC, 416. Containers, milk, paper, 1441. Continental maps of four ionospheric disturbances, 675. 310
Continuous, analysis of ortho-parahydrogen mixtures,

1294. measurement of atmospheric ozone bv an automatic

photoelectric method, 977. phase difference measurements of earth satellites, 2499.

Contractibility and convexity, 978.

Contractile, reversible processes in fibrous macromolecules, 2743. Contribution, of the annihilation radiation to the gamma-ray flux in lead, 2917. determination of eigenvalues, AMS49.

dictionary of physics and electronics, 1660A. Handbook of Physics: 2500. Arithmetic. Color vision and colorimetry. Control mechanisms.

Electrolytic conductivity and electrode processes. Electronic circuits. Elements of probability. Geometry.

Integral equations. Neutron physics. Nuclear electromagnetic radiations.

Statistical design of experiments. Thermometry and pyrometry.

studv of transport phenomena in gases at high densities, 1296. theorv of rank order statistics—the two sample case, 1661.

Control, and measurement, integration of concepts in the terminology, 1935. charts may be all right, but—, 676.

factors affecting the reproducibility of mechanical

properties of refractory semi-drv press specimens,

2501. mechanisms, 2500.

Controls, jet engine, simulator for use in development,

C584. Convenient microwave harmonic generator, 1662. Convergence, of a method of solving linear problems, 417. Newton's method in complex Banach spaces, 559. numerical iteration, 856. Rayleigh quotient iteration for the computation of characteristic roots and vectors, 3003; 3004.

Seidel iterants of nearly symmetric matrices, 329.

series, 145. Converging factors, method for the determination of, applied to the asymptotic expansions for the parabolic cylinder functions, 366. Conversion of payroll processes at the National Bureau

of Standards, 2070. Converters and frequency multipliers for measurement

control, 1349. Convex, cones, theorem on, with applications to linear

inequalities, 380. functions or linear transforms, 2115. normed linear spaces, 1350. polyhedra, intergral boundary points, 1743. Convexity, and contactibility, 978.

field of a linear transformation, 2918.

Cooling, magnetic, 1395. Copolymer composition by combustion analysis for car- bon and hydrogen, determination, J 64A2, 157. Copolymers, butadiene-styrene, crystallization, 983. melting, 1774. temperatures of, glass transition, 2576. Copper, and copper alloys, thermal conductivities, 2393.

coalesced, thermal conductivity, RP2805.

dilute alloys, 2852A.

free-machining, low-temperature thermal conductivity, 1393. functions at low temperatures, 2537.

ions, influence of, on the adherence of vitreous coat- ings to stainless steel, 1737. molybdenum, silver, tantalum, and gold at 662 kev,

total photoelectric cross sections, 3101. natural rubber, 523.

nickel and nickel-copper alloy, annealed, creep of, ixr 2836.

pure, thermal and electrical conductivity, 2841

B

tin, iron, silicon, and nickel, electrorefining studies, twinned epitaxy of, RP2873.

wires, measurement of the resistance-strain relation and Poisson's ratio, 1768. Copper-tin alloys, gallium, some physical properties, 1876. Coppers, commercial, low-temperature thermal conductivity, 2181. Core, a spherical, impedance characteristics of a uniform

current loop, J 64D3, 295. bozes, versatile, 619.

losses in ferromagnetic materials, RP2865.

Corpuscular spectrometers, 2791.

Correction, factors for the balancing effect in one leg of a U-type manometer, 211. factors for the balancing effect of a gas in one leg of a manometer, 212. instrumental drift in flame photometry, RP2918.

Corrections, generalized tables of, to thermodynamic

properties for nonpolar gases, 1721. Correlation, correction to the activation energy for diffusion

in crystalline solids, 2502.

effects in impurity diffusion, 2919. number of absolute points of, 1943.

solar noise fluctuations in harmonically related bands,

J 63D3, 293. VHF propagation over irregular terrain, 1663. Corrosion, and its prevention, geometric factors in electrical measurements, 1354. aluminum alloys by exhaust gases, 979. factors in design, 213. galvanic, potential-current relations, 142. galvanic theory for adherence of porcelain enamel ground coats to steel, 2358. observing 3d year anniversary of "Corrosion Technology." 1664. research at the National Bureau of Standards, 1297;

2503.

stress, cracking of a gold wedding ring, 1513.

stress, cracking of austenitic stainless steel, 2789.

stress, cracking of type 304 austenitic stainless steel, 1898.

stress, cracking, sand cast aluminum alloy 220; 2349.

study, 45-year, results of Bureau of Standards, 2287. Corrugated, diaphragms, investigations of the properties, 1378. diaphragms, properties, of, investigations, 2166. Corundum, ores, 1081. synthetic single crystal, elastic constants of, at room

temperature, J 64A3, 213. Cosine of the solar zenith angle (x) for thirty-five locations, tables of median hourly values, TN5 (PB151364).

Cosmic, examples of heat conduction in very rare rotating

or expanding gases, 2920.

. radio noise intensities in the VHF band, 418. Cosmic-ray, fast, neutrons, sea-level latitude variation, 343. Cosmical gas dynamics, 2697. Cotton, and viscose rayon, 973.

fabrics, abrasion resistance on, made with the blade type abradant and the Schiefer abrasion testing machine, 382. wool, and nylon fabrics at different temperatures and

relative humidities, 2793. Coulomb, wave function by means of recurrence relations, generation, 1532. wave functions along the transition line, evaluation

of, 1018. wave functions expressed in terms of Bessel-Clifford and Bessel functions, 214. wave functions expressed in terms of Bessel-Clifford functions, regular and irregular, 1127. wave functions in the transition region, 980. Coulometer, coulometric-titration, J 63C1, 65.

311
Coulometric titration of acids and bases, precise, J63 A2, 153.

tritrations, precise, 1815. Coulometric-titration coulometer, J 63C1, 65. Counter sources, Aw, self-absorption in, RP2859.

Counters, Cerenkov, fast coincidences, 447. Counting machine, automatic, 398. Couplers, direction, directivity of, method for measuring,

2425. Coupling chart for soleniod coils, 41. Covariances of least-squares estimates when residuals are

correlated, 2504. Coverage of standard frequency station WWVH, 42. Cr+++ ion in the paramagnetic alums, properties of low

temperatures, 522. Cracking, in masonry caused by expansion of mortar, 419. reinforced concrete flexural members, 1665. Crazing, of acrylic resins, 1298. polymethyl methacrylate at various temperatures,

555. Creep, and acrylic glazing plastics, 1065. annealed nickel, copper, and two nickel-copper alloys, RP2836.

behavior of structural joints of aircraft materials under constant load and temperatures, 2071. behavior of transparent plastics at elevated temperatures, 2921. cold-drawn nickel, J 63C1, 1. creep rupture characteristics of some riveted and

spot-welded lap joints of aircraft materials, 1299.

crystalline nonmetals, 2072.

static strengths of large bolted joints of forged aluminum alloys under various temperature

conditions, 2505.

Cristobalite, inversion temperature, RP2902.

low, type, crystal structure of aluminum phosphate and gallium phosphate, 1923. pure, structural anomalies, 3048.

Criteria, for the characterization of kaolinite, halloysite, and a related mineral in clays and soils, 420. existence and equioscillation of best Tchebycheff

approximations, J 64B2, 91. Critical field phenomena in an isotropic paramagnetic

crystal, 981.

Critique, 1958, of VHF ionospheric scatter communication,

2505A.

Cross, section for photodetachment of electrons from Hand D-, experimental, 1338.

section, photodetachment, and the electron affinity of atomic oxygen, 2683.

sections for charge transfer collisions of low energy

ions in N2 and 02 , 982.

Cross-field error in unsymmetrical range finders, 1300. CRPL exponential reference atmosphere, Mono.4. Cryogenic, characteristics of wire resistance strain gages, 2073.

engineering, 2922. Engineering Laboratories of the NBH, activities, 1252. engineering, recent advances, 3031.

structural adhesives, epoxy, 2547. systems, bibliography of the physical equilibria and

related properties, TN56 (PB161557).

Cryogenics, 1301. Cryoscopic, determination of purity of highly reactive substances, 1666. determinations of purity of benzene by thermometric and calorimetric procedures, comparison, 2062. Cryostat, for electron bombardment and electron

diffraction work, 2506. heating control, amplifier, 2090.

liquid helium, with an integral super-conducting

resonator, 2610A.

temperature control, wide-range, 3113.

Crystal, and molecular structure models, bibliography, Mono. 14. chemistry symposium, 215. detectors and three-millimeter harmonic generators, performance, 2244.

growth, and electrical and optical properties of gray,

tin, studies, 1518. mount and techniques for measuring high frequency! induced electroluminescence, 2074.

orientation on fatigue-crack initiation in polycrystalline aluminum alloys, effect, 2096.

oscillators, subharmonic, 1154. paramagnetic, isotropic, 981. resonators, underearth, 903. structure of a and /3 nitrogen, 2879. structure of aluminum phosphate and gallium phos- phate, low cristobalite type, 1923. structure of anhydrous indium phosphate and thallic phosphate by X-ray diffraction, 1667. structure of barium hydrogen orthophosphate, RP2817. structure of triclinic magnesium pyroborate, refine- ment, RP2936.

Crystal-stabilized pulse-pair generator, 1302. Crystal-TV, scintillation, device X-rays objects in motion,

1484. Crystalline dextrose between 25° and 95° C, heat capacity,

246.

field, single-axis rotator in, theory of dielectric re- laxation, 1554. nonmetals, creep, 2072. polymers, melting, 3083. polyphenyls, infrared spectra of, RP2829.

quartz, internal friction, 2022.

solids, diffusion in, correlation correction to the acti- vation energy, 2502.

Crystallinity of poly(chlorotrifluoroethylene), specific volume and degree, 2831.

Crystallization, butadiene-styrene copolymers, 983.

flexible polymer molecules, 1924. high polymers: natural rubber, thermodynamics,

1558. high polymers, thermodynamics, 2846.

kinetics in polymeric systems, 2507; 2923. polymers, kinetics, 1047; 1382. thermodynamics of, in high-polymers; gutta percha,

1965. Crystallographic, cold drawn music wire, 2509. data for yohimbine hydrochloride, 2508.

investigation of tricalcium phosphate hydrate, 421.

Crystals, cesium bromide, transmittance, 349. copper single, in water, oxidation of, effect of illumi- nation, 2097. folded chains in dilute solution, theory of formation

of polymer J 64A1, 73. germanium single, thermoelectric power in, 896. gray tin, 2672.

ionic cubic, lattice energies, 2175. pure hydroxyapatite, preparation, 1816. quartz, detwinning, TN3, (PB151362).

single aluminum, growth of, RP2868.

single, ceramic oxide, plastic deformation, 2253.

single, plastic deformation of ceramic-oxide, 1108. Cube, capacity of, computation, 779. Cumulative, data, fitting a straight line to certain types, 2125.

fatigue damage of axially loaded Alclad 75S-T6 and

Alclad 24S-T3 aluminum-alloy sheet, 1303. Cunife wire magnets of small size, RP2808. Cuprammonium solvent and cellulose solutions, 112. Curie- Weiss law on exchange, dependence of the constants, 1431. Current, and potential relations for the cathodic pro- tection of steel in a high resistivity environment,

J 63C1, 37. potential relations for the cathodic protection of steel in salt water, RP2833.

measured with a Pellat-type electrodynamometer, RP2845. measurement with the National Bureau of Standards

current balance, RP2846.

problems in refining with bone char, 984. situation with regard to permissible radiation ex- posure levels, 2075.
Currents, earth, near a top-loaded nionopole antenna, with special regard to electricity small L- and

T- antennas, RP2961.

excited on a conducting surface of large radius of curvature, 1668. Cuspidine, synthetic, 2795. Cutting characteristics of dental burs as shown by high speed photomicrography, 2076. Cuvette, densitometer for cardiac output determination by the dye-dilution method, 650. densitometer," new, for determination of cardiac output, evaluation of, 714. CYV field intensity, and backscatter delay, comparison,

361. high-frequency, records with the aid of simultaneous

pulse data, interpretation, 472. Cyanide, carbon-14-labeled, preparation, 2262. deuterium, vibrational energy, 1575. hydrogen and deuterium cvanide, infrared spectra,

' 1739.

Cvclic, acetals of sugars, infrared absorption spectra, RP2960.

cubic units, a computation of, RP2783.

single step iteration, over and under relaxation in the theory of, 781.

strain testing machine for leather, 1304. Cylinder functions, parabolic, 366.

parabolic, asymptotic expansions, 366. Cylinder of finite length, response of a loaded electric dipole, J 64D3, 289. Cylinders, and plates, forces on, in an oscillating fluid, RP2857.

circumferential slots on moderately large conducting,

radiation patterns, 1830.

Cylindrical, cavity containing a gyromagnetic material, 2013.

circular, enclosure, right, acoustic impedance of, 941. spheroidal, and spherical bodies, J 64B1, 15. structure excited by an axial line source, surface- wave resonance effect in a reactive, J 64D1, 13. vessel, conductivity of a fluid contained in, measurement, 2233. Gyroscopic data, calculation, 2042. D

Dacron and Mylar polyester strands at low temperatures, some mechanical properties, 2761. Dampproofing and waterproofing materials, 164. Dangers of radiation, 1305. Data, concerning atomic spectra, 677. cyroscopic, calculation, 2042. extreme-value, new method of analyzing, 922. processing, automatic, in the Government (1956). progress report, 1822. receiving tubes, H68.

straight-line, analyzing, 652. suspected, some procedures for the rejection of, 784. Day-to-day coordination of IGY observations, 3068.

Day's, M. M., characterization of inner-product spaces and a conjecture of L. M. Blumenthal, remark, 373. Daytime constancy of the absorption of radio waves in the lower ionosphere, 2661. Dead space, indirectly calculated, RP2826.

Deaired brick, durability, 1683. Decay, Cd116 isomers, 569. constant in vibrating systems, 678. Declaration of Independence and the Constitution of the US, preservation, 288. Decomposition, CF 4 in flames, 1176. hydrazoic acid by the electric discharge, mass spec- trometric study, 2623. thermal of polymers, 1556. thermal, of poly (vinyl chloride), 3099. Dedekind, eta-function, some algebraic number theory

estimates, 1871. number formula, cubic class, a numerical study of, RP2798.

Definition and measurement of the time constant and re- spouse time of thermal converters, 2809

Defocusing, focusing, and refraction in u circularly stratified atmosphere, J 64D3, 287. Deformation, elastic, in strips with holes loaded throutrh

pins, RP2945.

tWill 679

g ^ Charpy V " notch specimens of ingot iron, Deformed nuclei, 2772. Degradation, asphalt, effeot of light and water on the, J 63C1, 31. cellulose acetate films, 2924.

cellulose in a vacuum with ultraviolet light, RP2841

collagen by heat, 2511. des poly meres par les rayons et les neutrons, 681

flow characteristics of polymer solutions, effect of capillary shape, RP2839.

high polymers, 43. mechanical shear, temperature dependence, 1527. polyisobutylenes on shearing in solution, 682. polymer studies by absorption and mass spectrometry, 515. polymers, high temperatures, thermal, J 63A3, 261. polymers, shearing forces, 976. polymers, thermal as a function of molecular structure and branching, 1557. polystyrene by means of mass spectrometry, study, products of asphalt, watersoluble, 2413. range straggling of high-energy radiations, 680.

solid polymers, photochemical, 2455. thermal, of cellulosic materials, RP2853.

thermal, of polyethylene oxide and polypropylene

oxides, 3100. thermal, of polymers, 2843. thermal of polymers at low rates, RP2957.

thermal, of unvulcanized and vulcanized rubber in a vacuum, 1961. Degree in orientation and crystal size on the scattering of 20-kev electrons by aluminum, 2529. Delegate reports on small tools, 2417. Delta wings, structural analysis and influence coefficients

for, 840. Delta-function approximations, 956. Delta-wing aircraft, effect of rib flexibility on the vibration modes of, RP2852.

Demagnetization, adiabatic, and the temperature scale below 1°K, 384. Demands on teachers in a technological society, 2512. Dense subgraphs and connectivity, 2925. Densitometer, cuvette, for cardiac output determination by the dye-dilution method, improvea, 650. cuvette, new, for determination of cardiac output,

evaluation of, 714. Density, entropy, in an infinite system, 2558. expansions of distribution functions. I. Virial expansion for finite closed systems; canonical ensemble,

2077. expansions of distribution functions. II. Density

expansions in the grand canonical ensemble, 2078. expansivity, and viscosity of molten alkali silicates, 422. formula for alkali silicate glasses from annealing to glass-processing temperatures, RP2915.

local electron, method for measuring from an art ificial satellite, J 63D3, 325. Dental, amalgam, 1613. amalgam, microstructurc, 765. amalgam: the effect of mechanical condensation of some physical properties, 423.

burs, cutting characteristics, 2076.

casting investments, mechanism of hygroscopic ex- pansion, 1405. cements, 1306. cements, silicate, 20. chromium-cobalt casting alloys, proposed specification, 1996. cutting instruments, rotating, 1165; 1494.

313
impression compound, revision of American Dental

Association specification No. 3, 1244. impression material, alignate hydrocolloidal, 986.

materials, American Dental Association specifications, 1614; 2451. ^o materials and instrumentation, review of 195b dental

research, 2290.

materials and instruments 1951-55, 1669. materials at the NBS, the program of training and

graduate instruction, 2827.

materials, relationships of, to clinical subjects, 1476. materials specifications and certification annual for 1943, 1307.

research, 2079.

research, resume, 1480.

research, reviews of 1956: dental materials and instru- mentation, 2290.

resins, self-curing, relationship between residual monomer and some properties, 1846.

restorations, margins of, fluid exchange, 451. roentgenographic equipment, protection, in the use, 1462.

rotating, diamond abrasive instruments, 2085.

science, physical research, 2891. X-ray exposure, radiation data during, ionization chambers, 1380. X-ray film, 2091. X-ray machine, panoramic, 1993. Dentin and enamel, human, determination of some compressive properties, 2518. Dentionoenamel junction, 2199. Dentistry, prosthetic, acrylic resins, 2449.

prosthetic, resins, 2738. Denture resins, 1216. American Dental Association specification No. 12, 644. dimensional stability, 2523. heat cured, bonding of plastic teeth, 402. processing: heat-curing type, 1819.

self-curing, properties, 521. some properties, effect of molding processes, 572. Departures, from the Saha equation under varying conditions of Lyman continuous opacity, 2926. hydrogen from L.T.E. in a stellar atmosphere and the consequent structure of the solar chromosphere,

2927. Dependence of the constants in the Curie-Weiss law on

exchange, 1431. Depolymerization, chain kinetics, 444.

chain, reactions, 44.

kinetics, some aspects, 307. polymethylene and polyethylene, 985. Deposits, characteristics, 2908. Derivative, Bessel functions with respect to the order, 2666. polynomial and Chebyshev approximation, 786. Description, analysis of the first spectrum of iodine, J 63A1, 1. color, 2080. method, double, 857. new, thorium spectra, Mono. 17. states in quantum mechanics by density matrix and

operator techniques, 2081.

;n, construction of a blackbody and its use in the

calibration of grating spectroradiometer, 2513. construction of a liquid hydrogen temperature

refrigeration system, TN38 (PB151397).

data for ortho-parahydrogen converters, 2514.

details of a linear magnetic UFH oscillator attenuator,

216. experiments in operations research, 1670. experiments in research and development, 2083.

features of a magnetic drum memory for the NBS

Western automatic computer (SWAC), 424. impact-resisting fabric structures, 3069. improvement of man-machine systems, analog-digital simulation, 2453. performance of a block-type osmometer, RP2931.

performance of a portable infiltration meter, 2082.

simple DC resistance thermometer bridges for wide- range temperature control, 2515. simple resistance thermometer bridges for wide-range

control of low temperatures, 2516.

single frequency filters, TN23 (PB151382). two-dimentional nozzles by the method of characteristics, 1432. using mathematics, 355. Designing electroformed parts, 683. Designs, balanced, note on, 923. Detector, null, pressure-sensitive diaphragm-type, 2698. Detergent, fractionated nonionic, light scattering measurements, 2176. Detergents, ionic, 2667.

synthetic, 318. Deterioration, during storage of alginate hydrocolloidal dental impression material, 986. microbiological, of leather, prevention, 1817.

silicate cements in the tropics, 217. Determinantal inequality, 1232; 2657. H. P. Robertson, 1980. Determinanten mit ueberwiegender Hauptdiagonale und

die absolute Konvergenz von linearen Iteration- sprozessen, 1671. Determinants, of Legendre polynomials, second order, 305. predominant principal diagonals and the absolute convergence of linear iteration processes, 1671. Determination of, acetylene in air in concentrations from

ten parts per billion to ten parts per million, 2928. aldehyde in cellulose: a review of methods, 1308. aluminum in precipitation hardening stainless steel and high temperature alloys, J 64A2, 181. amplitude-probability distribution of atmospheric

radio noise from statistical moments, J 64D1, 49. attenuation from impedance measurements, 45. carbon monoxide in studies of air pollution, 1309. copolymer composition by combustion analysis for carbon and hydrogen, J 64A2, 157. correlation of flow capacities of pneumatic components, C588.

critical depth in spatially variable flow, 425.

critical micelle concentrations by a bubble pressure method, 787.

dissociation constants in a mixture of two weak acids by electromotive force measurements, 218. dynamic stress-strain curves from stain waves in long

bars, 684. eigenvectors and eigenvalues of symmetric matrices, 330. extreme values of the spectrum of a bounded self- adjoint operator, 220. freezing point of engine antifreezes, 331. gamma-ray emission of radium, RP2801.

general index of effort in sorting mail by conventional methods. TN54 (PB161555).

glucose by means of sodium chlorite, 1310. grease in leather, 219. impedance with a double-slug transformer, 570. inorganic constituents in sucrose solutions, 987. loads in the presence of thermal stresses, 988. monomer content of polymethyl methacrylate, 1671 niobium and tantalum in titanium-base alio; RP2929.

nitrogen and sulfur in steel, 427. nitrogen in leather by Kjeldahl method, 332. phosphate by differential spectrophometry, 6

;

.

reducing sugars and reducing end groups in poly

saccharides by reaction with carbon- 14-labeler cyanide, 2517.

resin content of glass fiber polyester laminates con- taining a calcium carbonate filler, 1672. reverberant sound absorption coefficient from acous

tic impedance measurement, 46. some compressive properties of human enamel am

dentin, 2518.

sulfur in rubber vulcanizates, 1311. thermodynamic acidity constants, 991.

673.

oys,

314
titanium, zirconium, niobium, and tantalum in steels: separations by anion-exchange, RP2923.

use of the sag point as a reference point in the heating

of glasses, RP2791.

viscosity of exhaust-gas mixtures at elevated temperatures, 989. water content in Freon-12 circulating in a refrigera- tion system, 990. Detwinning quartz crystals, TN3 (PB 15 1362). Deuterated, ammonia, 2411. styrene polymers, 2680. Deutefide, hydrogen, 153. Deuterium, as a tracer, mechanism of formation of OH,

CH, and HCO in flame spectra, 868. cyanide and hydrogen cyanide, infrared spectra, 1739. cyanide, vibrational energy, 1575. hydrogen, mixtures, distillation, 2093. hydrogen molecules, 2410. hydrogen-deuterium mixtures, spectroscopic analysis, 551.

liquid normal, pressure-volume temperature relations

of, 1115.

oxide, dielectric constant of, RP2874.

sulfide, some infrared bands of, RP2789.

use of, to investigate extent of branching in polystyrene, 1220. Deutero-ammonias, microwave spectra, 260. Deuteromethanes, redetermination of mass spectra, RP2896.

vapor pressures of, 889. Deuterostyrene a and /3 pryolysis, polymers, 1464. Deuterostyrenes, mass spectra of some, RP2926.

Developing seals for abrasive-fluid mixtures, 221. Development of, automatic computers, 1675.

craze and impact resistance in glazing plastics by

multiaxial stretching, 2084. evaluation of ceramic coatings for thermocouples,

1674. methods for evaulation of rotating dental diamond

abrasive instruments, 2085. some infrared transmitting glasses, 1177. turbulence-measuring equipment, 686. VHF field-intensity standards, 427. Developments in, instruments, 2519.

recent, the field of microwave power measurements

at the NBS, 2720. synthetic materials in America in 1959, 21. vibration measurement, 1492. Deviation, standard, and mean absolute value of the phase

of a constant vector plus a Rayleigh-distributed

vector, RP2950.

Device for filtering and precise dispensing of solutions in closed systems, 47. Dewar, nonventing liquid helium, temperature stratification, J 64C1, 19. Dewars, calculation of gaseous heat conduction, 2482. Dextran, intrinsic viscosity-molecular weight relationships, 745. sorption of, collodion membranes, 832. sorption of serum albumin and surface-active agents,

cellulose nitrate membranes in the presence of, 1500. Dextrans, clinical, by periodate oxidation and isotope

dilution techniques, structural analysis, 2319. Dextrose in sugar mixtures, quantitative chromotographic

procedure for determining, 2276. Diagnostic tests, index for rating, 71. Diagonal tension in reinforced concrete beams, 222. Diagonalizing second-order matrices, tables for, RP2838.

Diagrams, phase, of interest to ceramists, compilation,

1656.

Dialysis experiments with ionic surface-active agents, low

rates of equilibration, 2232. Diameter and length of the driven element, impedance of a

corner-reflector antenna as a function of the, J 64D2, 135. Diamond, some properties, 2762. Diaphragm, error and testing rate in the paper bursting

test, 428. theory, Haringx, invited discussion, 2167.

Diaphragms, corrugated, design of, 1981. corrugated, investigations of the properties, 1378; 2106 Diaphragm-type null detector, pressure-sensitive, ' 2698 Diathermy, generators, 429.

rules and the physician 430. Diatomic, free radicals of the isotopic hydrides of oxveen and sulphur, 1357.

gases, pure, thermodynamic properties, effect of dis- sociation, 1326. hydrides, electronic structure, 2543. molecular negative ions, 2841. molecules, oxygen, nitrogen, nitricocide, and their molecule ions, 2394. molecules, vibrational energy exchange between, 2862. Diborane, heat of reaction of, with water and the heat of formation of boric oxide, RP2927.

pentaborane, heats of formation, RP2901.

Diboron tetrachloride, vibrational spectrum and force constants, 2409.

Dielectric, amplifiers, 963. cavity resonator, measurements on rod samples, 2907

constant of deuterium oxide, RP2874.

constant of hydrogen-bonded liquids, RP2905.

constant of water vapor, 431. constant, resistivity, and power factor of leather, 533. dispersion data for pure liquids and dilute solutions,

tables, C589.

elastic, and piezoelectric constants of quartz, method

for dynamic determination, Mono.9.

elasticity loss of quartz, 1620.

interface, impedance of a wire grid parallel, 2364.

loss in two urea addition compounds, analysis, 2454. measurements from 100 to 400 Mc, variable length re- entrant cavity, 638. measurements up to 500° C, symposium on temperature stability of electrical insulating materials,

992. properties of gases, 259. properties of magnesium-strontium titanates, note, 2221.

properties of titania or tin oxide containing varying

proportions or rare-earth oxides, 2520.

properties, polymer physics and their relation to, 2440.

relaxation for a single-axis rotator in a crystalline

field, theory, 1554. standards, American, 944.

Dielectrics, advancements in, 642; 943.

dipoles in an interface between two, radiation resist- ance, 1833.

low-loss, measuring power factor, 256. Dies, rotors, and rate of shear on Mooney viscosity, 740. Differences in the relationship between ionospheric critical frequencies and sunspot number for different sun- spot cycles, 571.

Differential, cross-section measurements for 1-Mev bremsstrahlung, 993.

cross-section measurements of thin-target bremsstrahlung produced by 2.7- to 9.7-Mev electrons, 1676.

integral geometry, metric methods in, 764. thermal analysis above 1200° C, 2521.

Differential equations, elliptic, discrete approximations,

1314. experiments in the solution, by Monte Carlo methods,

1019. hydrodynamic stability in a domain containing a

transition point, asymptotic solution of, 656. integrable forcing term, stable systems, 1893.

integral, some connections between probability theory and differential, 278.

linear, analytic systems, solutions, 932. non-linear, behavior in the large of the integral curves, 2662.

non-linear, of the second order with integrable forcing term, 1429. numerical solution, 1588. ordinary, non-self-adjoint boundary value problems, J 64B2, 83. recurrent relations, solution of, 97. Riccati's, note on the solution, J 64B2, 95. 569918 0—61 21 315
roots of Riccati's: low- and very low-radiofrequency

tables of ground wave parameters for the spherical earth theory, TN7, (PB151366).

Differentiation, numerical, in the complex plane, formulas,

453. , . Diffraction, electromagnetic pulses by curved conducting

surfaces, 3005. electromagnetic waves bv smooth obstacles for grazing

angles, J 63D2, 181. powder patterns, standard X-ray, C539, Vols. 7, 8, 9. reflection of waves and pulses by wedges and corners, RP2906.

spherical wave pulse by a half plane screen, 2086. waves by wedges, 1792. Diffuse nebulae, bright rims, 2479.

Diffusion, impurity, 2919.

particles in turbulent flow, 2929.

particles with memory, 2087. penetration of hard X-rays: polarization effects, 793. Difluoride, oxygen, by electron impact, 2169. Difluorodichloro methane (freon-12), gaseous, thermody- namic properties, 604.

Digital, analog, simulation for the design and improvement

of man-machine systems, 2453. computers, system design at the NBS: methods for high-speed addition and multiplication. C591,

Sect. 1. computers, two, interconnection, 1536.

logic machine, computational methods, 1061. reduction of spectrophotometry data to Munsel)

renotations, 2522. Dihedral and trihedral angles, sums of, in a tetrahedron

597. Dilute, alloys of copper, 2852A. aqueous solutions on ionic detergents, 2667. protein solutions, interpretation of hydrodynamic

data, 2668.

solution, thermodynamic behavior of flexible chain

molecules: polymethyl methacrylate, 687. Dilworth's theorem on partially ordered sets, 1677. Dimensional, stability of denture base resins, 2523. two, patterns by scanning techniques, processing of, 802. Dimensions, units, and standards, 2088.

units in physics, 611. 2,6-Dimethylbenzoic acid in water, 2369. Dimethylmercury, isotope analysis, 1381. Dimethylphosphinoborine trimer: mass spectra and ther- mal decomposition, 994. Diode, reactance modulator, 3070.

resistance, bridge circuit for temperature control, TN34 (PB151393).

retarding field, 566. Diodes and capacitors, experimental rapid access memorv.

392. Dioxide, magnesium oxide-germanium, 3094. titanium, semiconductors, electrical properties, 704. uranium, specimens, effect of particle size on the bulk

density and strength properties, 1926. Dip coater, improved, 949; 1033. Dipole, in an imperfectly conducing cylinder of finite length, J 64D3, 289. magnetic, arc-lengths along the lines of force, 1633. moment of perchloryl fluoride, 2089. Dipoles in an interface between two dielectrics, radiation

resistance, 1833. Dirac theory, simplified approach to spin, 2757.

Direct, approach to the problem of stability in the numerical solution of partial differential equations, 1588.

filling resins: dimensional changes resulting from

polymerization shrinkage and water absorption,

filling resins, mechanical properties, 1069.

indirect filling resins: a review of some physical and

chemical properties, 688. nitrogen calibration of dead space in gas absorption

systems, 2524. observation of nuclear absorption and elastic scatter- ing of X-rays, 1312.

resinous filling materials: temperature rise during

polymerization, 223. Direct-coupled, circuits, 962. power amplifier for cryostat heating control, 2090. Direct-current bridge for accurate bolometric power

measurements, RP2776.

Direct-indicating recording instruments, 690. Directional, couplers, directivity of, method for measuring, 2425.

distribution of 1040-kev radiation from a high voltage X-ray tube, 224. Disaster monitoring with amateur photographic film and with dental X-ray film, 2091.

Discrete, analogs of inequalities of Wirtinger Monatsh,

1313. approximations to elliptic differential equations, 1314. Discussion of, design of corrugated diaphragms, 1981. paper "Heat treatment affects properties of enamelsteel composites," 2525. paper "Heavy Steel- Aggregate Concrete," 1678. paper "Pressure-flow characteristics of pneumatic

valves," 2092. paper "Wave action in diffusers for exhaust-pipe sys- tems, with special reference to the scavenging of two-stroke engines," 1679. Disintegration, Ba113

, 1178.

5.8d Sb"0

, 1315. Nb"i and Nb9*, 1179. scheme of I

131

, 150. selenium-73, 1316; 1680. Dispersion, dielectric, data for pure liquids and dilute

solutions, tables, C589.

F2-layer critical frequencies, 225. function of paramagnetic relaxation, 2418. NH3 in the microwave region, 48. sound in gases, 971. Dissociation, 4-chloro-4'-aminodiphenylsulfone, RP2794.

ionization of hydrazoic acid and methyl azide by

electron impact, 2604.

ionization of oxygen difluoride by electron impact,

2169.

ionization of perchlorylfluoride by electron impact,

2170. Dissociation constant, aqueous ammonia at 0° to 50° from EMF studies of the ammonium salt of a weak acid, 49. d,Z-malic acid, RP2947.

Distillation, analytical, 2744. hydrogen-deuterium mixtures, 2093. hydrogen isotopes, 2526. multicomponent, separation of hydrogen isotopes, 2751. Distinct representatives, on systems, 1793. Distinction between initiation and propagation of a fa- tigue crack, 1925.

Distortion, inverse nodal slide, evaluation of, J 63C2,

105. low, transistor audio oscillator, 755. magnification, variation, 1572. modified goniometric method, evaluation of lens, J 63C2, 113. Distribution, electrical conduction currents in the vicinity

of thunderstorms, 432. electron scattering by gold, 1317.

electrons scattered by solids, 1681.

functions, essential property of the Fourier trans- forms, 391. incoming lettermail at the Baltimore, Maryland

City Post Office, TN33 (PB151392).

linear energy transfer, or "ion density" for fast neutrons in water, 1180. mail by destination at the San Francisco, Los Angeles, and Baltimore post offices, TN27 (PB151386). matter with temperature in the emission corona,

2930. normal, note, 1595. normal, property of, 928. phase diagrams of interest to ceramists, 1318. 316
serial correlation coefficient near the ends of the

range, 2527. Diurnal change of ionospheric heights deduced from phase

velocity, 2931. Divided differences, modified, 1092. Documentation in instrumentation, 1682. Documents, preservation, bv lamination, Mono.

5

Does rationalization change units, 2094. Door, wall, and floor constructions, sound insulation, BMS144, 2d Suppl. Doppler shift measurements for studying ionospheric fine structure using earth satellites, comparison of phase differences, 2493. Dose, distributions in water for betatron X-rays to 37 Mev, studies, 1904. measurements in water using scintillation and ioni- zation detectors, 995. walls in radiographic rooms, 1319. Dosimeter, gamma-ray, neutron-insensitive, 2211. photographic personnel, for X-radiation in the range from 30 kev to beyond 1 Mev, 1994. Dosimeters, radiation survey meters, pocket chambers, X-ray calibration, 172. Dosimetry, film badge, 1021.

high-level, measurement systems, 2984.

ionizing radiations, introductory remarks on, 1045. photographic, at total exposure levels below 20 mr, TN29 (PB151388).

photographic, of X- and gamma-rays, 2611. radiophotoluminescence, system of the U.S. Navy, 809. Double, description method, 857. scattering of electrons with magnetic interaction, 1320. Double-pulse total-absorption fast neutron spectrometer, TNI (PB151360).

Double-slug transformer, determination of impedance, 570. Doubly stochastic transforms of a vector, 2658. Downcomina; radio waves, measurement of characteristics, 2932. Drain casting of a high-grade magnesium oxide support

used in an experimental vacuum tube, 996. Drainage, method, cathode film studies, 1282. venting, problems, 289.

Drift, instrumental, correction for in flame photometry, RP2918. Dry cell standards broadened—now includes mercury-, air-, and flat-type cells, 1321. Dry cells, batteries, specification, H71.

gassing, 2359. Dry, static calorimeter for RF power measurement, 2419. Drying twist in plant fibers, 1181. Dual-amplitude axial-load fatigue machine, 626. Durability, bovs' shoes, 691. deaired brick, 1683. Duration of random walks, 281. Dyes, azo, 881.

azo, and indigo, steric effects, 1897.

azo, in organic solvents, hydration, 1543. chemical constitution, relation between the absorption

spectra. XXV. Phototropism and cis-trans isomerism in aromatic azo compounds, 593. chemical constitution, relation between the absorption

spectra. XXII. Cis-trans isomerism in thioin- digo dyes, 341. chemical constitution, relation between the absorption

spectra. XXIV. Cis-trans isomerism in thioin- digo dyes in sulfuric acid, 342. chemical constitution, absorption spectra, relation. XXVIII. The hydration of azo dyes in organic

solvents, 1543.

direct azo, interaction in aqueous solution, RP2823.

phototropic, shutter-illumination device for the study,

374. Dynamic, bulk viscosity of polyisobutylene, 1182.

characteristics of accelerometers by rotation, 913. compliance, dynamic modulus, and equivalent Voight and Maxwell models for polyisobutylene, 692. determination of the elastic, dielectric, and piezoelectric constants of quartz, Mono. 9.

measurements of the magnetoelastic properties of

ferrites, TN49 (PB151408).

mechanical properties ol" polyisobutylene 1183 spectrum for Sacremento Peak, 1233.

static tests for mechanical properties of fired plastic refractories and other more resilient materials, Dynamics, complete right ventricular failure in dogs maintained with an extracorporeal left ventricle, 1(185 cosmical gas, 2697.

inlet ^sys^tem of a four-stroke single-cylinder engine, Dynamo, atmospheric, theory, 2228.

Early, history and development of building codes, 2095 work in applied optics at the NBS, 226. Earphones, audiometer, probe tube method for the transfer

of threshold standards, 632.

ears and couplers, 1199. Earth, electrical resistance, 1928. environment, 3071. ionosphere, multiple reflections between, in VLF propagation, 1781. propagation in the vicinity of Point Barrow, Alaska,

J 64D1, 95. rare, region, photoneutron yields, 2249. Earth currents, near a monopole antenna with symmetrical

top loading, RP2959.

near a top-loaded monopole antenna with a special regard to electrically small L- and T-antennas, RP2961.

near a VLF monopole antenna with a radial wire ground system, 2437. Earth satellite, comparison of phase difference and Doppler

shift measurements for studying ionospheric fine structure, using, 2493. continuous phase difference measurements, 2499. theory of the effect of drag on the orbital inclination

of, RP2934.

Earth-flattening procedure in propagation around a sphere, J 64D1, 61. Earth's exosphere, very low-frequency emissions, 3097. upper atmosphere, gravitation and thermal oscil- lations, 1726. Echo on the operation of high frequency communication

circuits, 2810. Echoes, low frequency ionosphere, note on the polarization, 371.

Eclipse, geomagnetic, phenomena, survey of, 1908. May 20, 1957, 121. Economic aspects of the bone char process in sugar refining, 132. Eddy-current mutual-inductance transducers with high- conductivity reference plates, 1323. Edge of space, 2849.

Editorial on Roentgen ray protection design, 433. Education in radiation protection, 1324.

Effect, Zeeman, 1584. Effect of, anodic (HAE) coating on the fatigue strength of magnesium alloy specimens, 1325; 1531. antenna size on gain, bandwidth, and efficiency, J 64D1, 1. atmospheric horizontal inhomogeneity upon ray

tracing, J 63D3, 287. calcium treatment on solubility and calcium uptake of synthetic hydroxyapatite and rat molar enamel,

2528. ceramic coating on the creep behavior of som 1 high temperature alloys, 3072. chemical combination of the characteristic energy loss of electrons, 997.

crystal field and spin-orbit coupling on magnetic

susceptibility of systems with /

2 electron

configuration, RP2893.

crystal orientation on fatigue-crack initiation in polycrystalline aluminum alloys, 2096. 317
degree in orientation and crystal size on the scattering

of 20-kev electrons by aluminum, 2529.

dissociation on thermodynamic properties of pure

diatomic gases, 1326. dissolved air on the speed of sound in water, 1686.

earth's magnetic field on m.u.f. calculations, 3075. echo on the operation of high frequency communication circuits, 2810. exposure to soils on the properties of asbestos-cement

pipes, 998.

fluorides on infrared transmittance of certain silicate glasses, 2933. fuel-immersion on laminated plastics, 50. ground screen on the field radiated from a monopole,

1688. heat treatment of the susceptibility of sand cast aluminum alloy 220 to stress corrosion cracking,

2349. illuminance of a lens interposed between the source and the illuminated surface, 858. illumination on the oxidation of copper single crystals

in water, 2097.

internal radiant heat transfer on temperature dis- tribution, thermal stress, and deflection in box

beams, RP2949.

light and water on the degradation of asphalt, J 63C1,

31.

light on coated groundwood papers, 693; 1327. melamine resin on chemical tests of paper, 227. microwave signals incident upon different regions of a dc hydrogen glow, 2098. molding processes on some properties of denture resins, 572. molecular weight on the crazing and tensile properties

of polymethyl methacrylate, 999. multipath distortion on the choice of operating

frequencies for high-frequency communication

circuits, 3073. new lower permissible exposure levels on use of radioactive isotopes, 2099. oxygen content of the furnace atmosphere on the adherence of vitreous coatings to iron, 1329. oxygen on the bonding of gold to fused silica, RP2942

particle size on the bulk density and strength properties of uranium dioxide specimens, 1926. preheating on thermal expansion of silica-gypsum

investiments, 1184. prism on the location of the principal point, 2350.

receiver bandwidth on amplitude distribution of VLF

atmospheric noise, 2351. recent mass-measurements on the faraday, 573. sample preparation on precision in the hide substance

determination, 1000.

size on the inlet-system dynamics in four-stroke, single-cylinder engines, 1687. small irregularities on the constitutive relations for the

ionosphere, J 63D2, 135. sporadic E on television reception, 574; 859. sporadic E on VHF transmission in North America,

3074.

straining rate on the compressive strength and elastic properties of concrete, 694. strain-temperature history on the tensile behavior of titanium and a titanium alloy, RP2897.

sudden water release on the reservoir free outflow hydrograph, J 63B2, 117. super-refractive layers on tropospheric signal characteristics in the Pacific coast region, 2100. suspension position on apparent values of internal

friction determined by Forster's method, 2530. temperature and degree of polymerization on the

sorption of water by polymethyl methacrylate,

tensile strain at low temperatures on deformation twinning in ingot iron, 695.

textile fiber structure on wear resistance, 610. transverse atmospheric drag on satellite orbits, 2532. 20-year marine exposure on some aluminum alloys,

variation of circuit parameters on the excitation of spectra by capacitor discharges, 696.

Effective, earth's radius for radiowave propagation beyond

the horizon, 228.

electrical constants of solid at low frequencies, 2352.

intensity of flashing lights, 2101.

Effectiveness of vacuum investing in the elimination of surface defects in gold castings, 697.

Effects of, acid treatment on acid and abrasion resistance

of porcelain enamels, 51. aging on the surface area of portland cement paste J 64A2, 163. antioxidants on asphalt durability, J 64C1, 13. atomic radiation on polymers, 698.

biaxial stretch-forming, 434. boundary and inhomogeneities on the penetration of gamma radiations, 2101.

fungicides on deterioration of leather, 2353. high degrees of biaxial stretch-forming on crazing and

other properties of acrylic plastic glazing, 699. high-altitude nuclear explosions on radio noise, J 64D1, 37. humidity during fabrication of polyester laminates,

435.

internal motion in the microwave spectrum of methylamine, 1001. ionosphere disturbances on low frequency propagation,

229. low temperatures and notch depth on the mechanical

behavior of an annealed commercially pure

titanium, RP2790.

moderate biaxial stretch-forming on tensile and

crazing properties of acrylic plastic glazing, 436. molding pressure on strength properties of glass-fiber reinforced plastics, 2533.

multiaxial stretching on crazing and other properties

of transparent plastics, 1002; 1690.

plastic and steel surfaces on clotting time of human

blood, 1003.

rates of straining on some tensile properties of polyester film, 2354.

resin coating methods and other variables on physical

properties of glass-fabric reinforced polyesters, 1004.

self-absorption of rotational "temperatures" of OH

in flames, 700. vibrational state on rotational intensity distribution

in OH, 701. weathering on certain mortars exposed in brick masonry with and without caps and flashings, 1927. Eigenvalues, bounds for, of Hermitian matrices by the segment method, 1005. eigenvectors of symmetric matrices, determination,

330. extremum property of sums, 1234.

free plate, RP2784.

further contributions to the solution of simultaneous

linear equations and the detemination of, AMS49.

matrix, circular disks containing, note, 2650. normal matrices, comparison theorem, 1231. sums of normal matrices, 1425. symmetric functions, note, 1990. symmetric integral equations, error bounds, 1767. Eigenvectors and eigenvalues of symmetric matrices, determination, 330. Eight decade logarithmic ohmmeter, 1619. Einschliessung von eigenwerten hermitescher Matrizen nach dem abschnittsverfahren, 1005. El sistema I. C. I. para la especificacion del color, 52. Elastic, constants and static strains with hydrostatic

pressure, variation, 2407. constants of synthetic single crystal corundum at room

temperature, J 64A3, 213. deformation in strips with holes loaded through pins, RP2945.

dielectric, and piezoelectric constants of quartz, method for dynamic determination, Mono.9. distortion error in the dead weight piston gage, 2103. 318
moduli of a borosilicate glass after heat treatment,

1844. moduli of glasses at elevated temperatures bv a dynamic method, 1692. moduli of indium antimonide, 1693. moduli of zinc blend lattices, ionic character, 2367.

nuclear, scattering of photons, 1787.

plastic behavior of the ferrite lattice in a low-allov

steel, 1691. problem for a ring of uniform force in an infinite bodv, RP2855.

properties of pure-gum rubber vulcanizates, 2534.

recovery, non-Newtonian flow, and molecular weight

distribution, 3037.

scattering, and absorption of X-rays, direct observation, 1312.

scattering of electrons and positrons by point nuclei, 1694.

scattering of photons, 1006. scattering of photons by tantalum, 2535. waves in anisotropic media, 2104.

Elasticitv, dielectric loss of quartz, 1620. rubber, 2810A

rubber, physics, 2251.

strength, and other related properties of some re- fractory castables, 2536.

Electrets, plastic, 796.

plastic, and their applications, 797.

Electric, discharge, mass spectrometric study of the decomposition of hydrazoic acid, 2623. discharge through nitrogen, oxygen, hydrogen, water, and ammonia, 2309.

discharges, absorption spectra of solids condensed at low temperatures, 2445.

field at the ground plane near a top-loaded monopole

antenna with special regard to electrically small L- and T-antennas, J 64D2, 139. hygrometers, C586.

Electrical, conduction currents in the vicinity of thunderstorms, distribution, 432. conduction in magnesium stannide at low temperatures, 1695. conductivity and Hall effect in oxide cathodes, 1063. conductivity, tables of transport integrals, C595.

connections, symbolic designations, 2334. constants of solid at low frequencies, 2352. contact resistance of copper, copper functions at low

temperatures, 2537.

differentiation of retarding potential measurements,

2596. discharge in Azote condensed to a solid state at very low temperature, 2944. discharge induced luminescence of solids at low temperatures, 2934.

indicating instruments used in early Edison central

stations, 702.

indicators, 1134. induced, polarization, 2431.

insulating materials, 992. noise from instrument cables subjected to shock and

vibration, 437.

optical properties of gray tin, studies of crystal growth,

1518.

optical properties of intermetallic compounds, 1330.

optical properties of intermetallic compounds. I. Indium antimonide, II. Gallium antimonide, and III. Aluminum antimonide, 1007. properties of indium antimonide, 703. properties of sammarium doped barium titanate, 2105.

properties of titanium dioxide semiconductors, 704. resistance of vulcanizates, carbon black differentiation, 408. resistance to the earth of a live tree, 1928.

resistivity of molten alkaline-earth borate glasses with three mole percent of potassium oxide, 2864.

resistivity of molten binary alkaline-earth borates, 1156.

thermal conductivity of aluminum and aluminum

alloys, 2841 A. thermal conductivity of pure copper, 2841B.

viscosity resistivity of molten alkali borates, 907.

Electrical instruments, 99. meters, 1814.

testing of, 886.

Electrical measurements, core curriculum, 2935. geometric factors, relating to corrosion and its pre- vention, 1354.

selection of bolt materials for service underground, 1008. standards, 316. Electrical-analog method for transient heat-flow analysis, RP2892.

y ' Electrically, heated filaments, on-off temperature control, 2660. short ground systems, fields, J 63D2, 175.

Electricity, standards, 2593.

static, hazards from, 461. Electrocardiographic data, TN42 (PB151401).

Electrochemical, battery system, 2436.

calorimetry, 2538.

theory, fifty years, 448. Electrode, determination of concentration polarization, 2605. processes and electrolytic conductivity, 2500.

silver, 1486.

silver-silver oxide, 1998. standard, potential of the silver, silver chloride elec- trode, 1895. Electrodeless metal-halide lamps, 705. Electrodeposited, coatings, specifications, 313. electropolished surfaces by means of the microinter- ferometer, measurement of surface roughness, 86. metals, and nickel, 511. Electrodeposition, aluminum, hydride bath, 363.

fifty years, 449. metals, 2936. some of the less common metals from nonaqueous

media, 1331. Electrodeposition of metals from organic solutions, Part

I, General survey, 1696. Part II: Further studies on the electrodeposition of aluminum from a hydride bath, 1697. Part III. Preparation and electrolysis of titanium and zirconium compounds in nonaqueous media,

2106. Part IV. Electrodeposition of beryllium and beryllium

alloys, 2107. Part V: Electrodeposition of magnesium and magnesium alloys, 2108.

Electrodeposits, porosity in, nature, cause and effect, 1940. Electrodes, hydrogen, titration of acids with, RP2769.

Electrodynamometer, Pellat-type measurement of current

with, RP2845.

Electroformed parts, designing, 683. Electroforming, 1009. precision waveguide components in the millimeter wavelengths, technique, 2339. waveguide components for the millimeter-wavelength range, C587.

Electroless, nickel plating, 2327. plating comes of age, 1010. Electroluminescence, high frequency induced, in zinc

sulfide, 1728. measuring high frequency, crystal mount and techniques, 2074. surface layer of BaTi03, SrTi03, and associated

materials, 2539.

Electrolysis of organic solvents with reference to the

electrodeposition of metals, 2936.

Electrolyte, single solid or molten chloride, theoretical electromotive forces for cells containing, 1957.

Electrolytes, polyethylene glycol, punched-cell batteries, 1828.

Electrolytic, coatings on magnesium base alloys from

alkaline chromate solutions, 1332. conductivity and electrode processes, 2500. 319
preparation of molybdenum from fused salts, 1333;

2811. Electrolyzed gas film, 865. Electromagnetic, acoustic pulses, propagation, 1799. audio-frequencv, noise during a period of solar disturb- ance, 2019. energy in a randomly inhomogeneous atmosphere,

scattering, 536.

field of rotating uniformly magnetized sphere, 575. ground wave on a spherical earth, transient behavior,

2386.

hiss, audio-frequency, recorded in Boulder in 1956, 2033.

interactions in dense materials, atomic theory, 1635.

nuclear, radiations, 2500. problems involving spheroidal, spherical, and cylindrical bodies, J 64Bl, 15. pulses by curved conducting surfaces, 3005. response of an imperfectly conducting thin dyke, 3006. sources immersed in a semi-infinite conducting medium, basic experimental studies of the magnetic field, J 64D1, 21. transient, dipole field by a conductive sheet, 1866. wave field, diffraction and reflection, RP2906.

Electromagnetic waves, along a curved surface, theory of propagation, 2673.

diffraction of, by smooth obstacles for grazing angles, J 63D2, 181. plasma, 3023. presence of stratified media, transmission and reflec- tion, RP2899.

Electromotive, theoretical forces for cells containing a

single solid or molten chloride electrolyte, 1957. Electromotive force, measurement, 141. measurements, 218. method of determining ionization constants: ioniza- tion of bisulfate ion, 3076. thermal, tables of transport integrals, C595.

Electron, absorption spectrometer using an improved

velocity analyzer, 2541.

affinities, atomic, 2900. bombardment and electron diffraction work, 2506. bombardment, light emission from solid nitrogen, 2975. bremsstrahlung spectrum, shape of high-energy, 2755.

characteristic energy losses in metals and compounds,

1699.

characteristic energy losses in some intermetallic compounds, 2937. corona with reference to radio observations, model,

2875. data processing equipment, evaluation, 1261. energetic secondary, cavity ionization theory including the effects, 1229.

free, conference on quantum interactions, 1659.

free, quantium interactions, 1829.

injection in betatrons, 1700. interference and phase effects. Electron interference phenomena, 1701. interference experiments, 1702. interferometer, 438; 947; 1202. interferometry, 707. measuring with, 2191. microscope, modification, for electron optical shadow

method, 91. optical image of an atomic beam, 1704. optical properties of space-charged clouds, 53.

optics, 286.

orbital, capture in vanadium, radiative, 1835. penetration, theory, 1548.

radiative, capture in cesium-131, 1834. slowing down, energy spectrum resulting from, 1015. spectra, C597.

spectrometers, 2612. spin resonance spectra from gamma-irradiated solid nitrogen, 2940. Electron affinity, atomic oxygen, 1334; 2812. atomic sulfur and empirical affinities of the light elements, 1698.

photodetachment cross section, of atomic oxygen.

2683. Electron beam, 929. interferometer, 706. magnetometer, J 63C1, 69. techniques, microwave power measurements, 2201. Electron beams, certain magnetic fields, note on the

focusing, 95. interacting, with application to solar radio noise, 1418. Electron density, fluctuations in the ionosphere, 2381.

local, method for measuring from an artificial satellite, J 63D3, 325.

profile data, analysis of ionospheric vertical soundings, TN14 (PB151373); TN19 (PB151378).

variations of the quiet ionosphere, TN40-1

(PB151399-1); TN40-2 (PB151399-2).

Electron impact, 580. dissociation and ionization of perchlorylfluoride, 2170.

ionization and dissociation of hexafluorobenzene, 2168. ionization and dissociation of hydrazoic acid and

methyl azide, 2604.

ionization and dissociation of methyl siloxanes, 747. ionization and dissociation of NF3, 1749. multiple ionization of rare gases by, J 63 A3, 201. multiple ionization of sodium vapor, 2996. oxygen difluoride, 2169. Electron impact studies, aromatic hydrocarbons, 2938. hydrazine and the substituted hydrazines, 2939.

sulfur dioxide and sulfuryl fluoride, 2542. Electron microscopy, 1011; 1703.

fibers, 4. soil clays and related materials, 439. Electron scattering, by gold, distribution, 1317. measurements, automatic instrument, 1274. phenomena, 2109. Electron-nuclear scattering, high energy, 1591. Electron-optical exploration of space charge in a cut-off magnetron, 230. Electron-tube curve generator, 440. Electron, averaging device for the adherometer, protective coating adhesion measurement, 2273.

circuits, 238; 2500. computer to reduce weathering test data, 2858. data processing systems, future developments, 2955. density fluctuations in turbulent ionized layers, 1254.

design, temperature prediction, 564.

digital computers, analysis of atomic spectra, 1624. flame temperatures and energy distributions, spec- troscopic study, 2310; 2771.

miniaturization, new techniques, 489. quenching of OH(2 S+) in flames and its significance in the interpretation of rotational relaxation, 2941. streams, certain, relation between the conductance and the noise power spectrum, 503. structure and magnetic properties of uranyl-like ions, 2355. structure of some diatomic hydrides, 2543. thermostat, time-proportional, 939. thickness gage: circuitry, operating characteristics, and calibration, further studies, 2133. voltage regulator, 135. Electronic computers, 488. aiding management control, 441.

air traffic control, role, 2380. European experience, 1336. Electronic equipment, airborne, new techniques for fabri- cation, 1415. maintenance, TN41 (PB151400).

sequential flow cooling, 1865.

Electronics, algebra of. 2803A.

industry, physical standards, 1808. measurements and standards, 2776.

physics, dictionary of, contributions, 1660A.

Electrons, 2989. aluminum, temperature dependence of the characteristic energy loss, 2798. carbon, range straggling of high-energy, 2279. cascade, and photons, energy spectra, RP2824.

320
Compton, gamma-ray measurements by the magnetic

energy loss, characteristic, 997. energy loss of, in passage through thin films, 1014.

fast, energy dissipation, Mono.l.

50-kev. bremsstrahlung cross-section measurements,

2477. from H- and D-, experimental cross section for photo- detachment, 1338. 1.0-Mev, bremsstrahlung polarization measurements,

1643.

positive. 131.

relativistic, multiple scattering, 1079. scattered by solids, distribution, 1681. secondary: average energy loss per ionization, 538.

solids, characteristic energy losses, 1287. standards, 1508.

their influence on resolving power, energy losses. 1335. 3d and 4p, polarization energy, 1448. 20-kev, by aluminum, 2529. 20-kev, in metal vapors, inelastic scattering, 2158.

2.7- to 9.7-Mev, 1676. vs photons: a comparison of microscopes, 54. with fine structure of the X-ray absorption spectra, comparison of the characteristic energy losses, 1655. with magnetic interaction, double scattering, 1320.

0.5- and 1.0-Mev, bremsstrahlung differential cross- section measurements, 1278. Electrons and positrons, 1204. backscattering, 567.

elastic scattering by point nuclei, 1694.

relative backscattering, 300. transmission, 1560. Electroplated articles, 940. coatings to titanium, adhesion, 1920. Electrorefining studies in the presence of tin, iron, copper,

silicon, and nickel, 2811. Electrostated fields by grounded external plates, 1066.

Electrostatic, deflection plates for cathode-rav tubes, J 64C2, 103.

field and type symmetry of snowflakes, 2689. magnetic fields, 56. Electrothermic instruments for the measurement of alter- nating current and voltage, 1012. Electroviscous effect in dilute aqueous solutions on ionic detergents, 2667. Elementary, inequalities relating to a gamma and incomplete gamma function, 3047. introduction to the calculus of variations, 23. note on powers of quaternions, 390. Elements, atomic energy levels, C467, Vol. III. mathematical theory of probability, 708. non-negative, topological proofs for certain theorems on matrices, 2850.

probability, 2500.

sun's atmosphere, 1138. Elevated temperatures, evaluation of resistance strain gages, 2420.

statistics and planning tests, 137. Eleven megacycle interferometer for low pressure gases, 648. Eleven-Mev thick target bremsstrahlung, 709. E.L.F. radio waves, TN52 (PB 161553). Elimination of randomization in certain statistical decision procedures and zero-sum two-person games, 231.

Elliptic, differential equations, discrete approximations,

1314.

linear, differential equations by difference equations with positive coefficients, 785. Embedding theorem for balanced incomplete block

designs, 948. Emission, He I, X 10803, during the great flare of August 26, 1958, 3077. OH, in the earth's atmosphere, 3001. spectrograph^ standards, 232. spontaneous, of neutrons from samarium, 383.

Emission spectra, autoignited heptane-air mixtures, 442.

first-stage combustion in an engine, 333. mixtures of atomic nitrogen and organic substances,

2544. nitrogen bombarded by high energy protons, 576. Emission spectroscopy, 443; 1013; 1705; 2545; 3021. Emission spectrum, carbon monoxide from 2.3 to 2.5 microns, RP2883. OH from 1.4 to 1.7 v, 860. OH from 2.8 to 4.1 y., 2356.

Emissivities of metallic surfaces at 76° K, 2110. Emulsions, thick-layered, background eradication, 30. Enamel, apatite, isomorphous substitution in, 748.

caries, experimental vitro production, 1734. human, and dentin, determination of some compressive properties, 2518.

porcelain, ground coats to steel, 2358.

rat molar, 2528. Enameled, porcelain, hot water tanks, 2745.

ranges, 1090. Enameled-steel composites, heat treatment affects properties, discussion of the paper, 2525. Enameling, iron during firing, 1153.

porcelain, a radioisotope study of metallic deposits, 1941. sheet steel, 1133. Enamels, procelain, effects of acid treatment on acid and

abrasion resistance, 51. porcelain, weatherability, 1578; 1579. Endurance of helical springs related to properties of the

wire, 710. Energetic species trapped at 4.2° K from gaseous dis- charges, 2942. Energy, angular distribution of X-rays scattered in lead, 2111.

characteristic, loss of electrons in aluminum, temperature dependence, 2798.

dissociation of the C-H bond in the formyl radical, 2813.

dissociation, of the OH radical, 1503.

distribution, spectroscopic study of electronic flame

temperatures, 2310. high electron-nuclear scattering, 1591. infrared radient, 124; 812.

release from discharged monatomic gases trapped at 4° K, 2546. spectra of cascade electrons and photons, RP2824.

spectral, distribution to the International Commission

on Illumination Light sources A, B, and C, 834. spectrum resulting from electron slowing down, C597;

1015. transfer in hot gases, 1016.

vibration, of deuterium cyanide, 1575. Energy dissipation, fast electrons, Mono.l. gamma radiation near the interface between two

media, calculation, 2043. high-energy X-rays, 1150. Energy levels, in F18 from alpha-particle reactions in nitrogen, 711. spectrum of neutral helium (

4 He I), J 64A1, 19. Energy loss, of electrons in passage through thin films, 1014. range of electrons and positrons, C577 Suppl. Energy losses, of electrons and their influence on resolving power, 1335.

electrons in solids, characteristic, 1287. metals and compounds, electron characteristic, 1699. Engine antifreezes, determination of freezing point, 331. emission spectra of first-stage combustion, 333.

four-stroke, single-cylinder, effect of size on the inlet- system dynamics, 1322; 1687.

fuels, multistage autoignition, 1411.

jet, controls, simulator for use in development, C584. Engineer at the National Bureau of Standards. 1929. Engineering, adhesives, selecting, 306.

civil, 2824.

cryogenic, 2922.

321
cryogenic, recent advances, 3031.

investigations, problems arising, 1457. management in a government laboratory, 712. materials, mechanical properties, 2193.

physics, and chemical measurements, how statistics improve, 68. Engines, expansion, for hydrogen liquefiers, J 64C1, 25. jet-type, high velocity exhaust gases, 1602. two-stroke, scavenging of, wave action in diffusers for exhaustpipe systems, 1679. Enthalpy, heat, specific entropy, free energy function

" entropy, free energy function, viscosity, and ther- mal conductivity of steam, compressibility factor, density, 1657. Entoptic color-perceptions of the macular pigment by

observers of normal and color-defective vision according to the three-components theory. 1706. Entropy, density in an infinite system, 2558.

specific heat, enthalpy, free energy function, viscosity, and thermal conductivity of steam, compressibility factor, density, 1657. Envelopes, vacuum tube, survey of the application of ceramics, 1604. Epitaxy, in metal-rock salt pairs, 367. twinned, of copper on copper, RP2873. Epoxy resins as cryogenic structural adhesives, 2547. Equation, atmospheric refractive index at radio frequencies, 855. calculating the number of chain scissions in the photochemical degradation of solid polymers, 2455.

differential, analytical integration for water storage, J 63B1, 43.

differential, occurring in the problem of heat convection in laminar flow through a tube, 789.

differential of hydrodynamic stability in a domain

containing a transition point, asymptotic solution, 656.

differential, Riccati's, note on the solution, J 64B2, 95.

differential, roots of Riccati's: low- and very low- radiofrequencv tables of ground wave parameters

for the spherical earth theory, TN7 (PB151366). helium wave, with the SEAC, numerical solution, 372. Equations, differential, experiments in the solution, by Monte Carlo methods, 1019.

differential, in the complex plane, 61.

differential, ordinary, non-self-adjoint boundary value problems, J 64B2, 83.

differential, solution of, by recurrence relations, 97. interpolation series, linear functional, 1050.

linear elliptic differential, 785.

linear, solving, 831. positive coefficients, 785. Equator, magnetic, 50 Mc oblique transmission experiment

near the, 2626. Equilibration in dialysis experiments with ionic surface- active agent's, low rates, 2232. Equilibrium, flexibility chain molecules, sedimentation,

2296. incomplete, and temperature measurement, 1735. phase, and melting-point, determinations, 1775. Equipment and method for photoelectric determination

of image contrast suitable for using square wave

targets, J 64C1, 57. Erosion, damage to solids caused by high-speed collision with rain, RP2882.

experimental plating of gun bores to retard, TN46

(PB151405).

surface, of filled plastics, 2792. Errata in tables relating to Hankel integrals of order zero, 147. Error, bounds for the eigenvalues of symmetric integral equations, 1707. Error function, 241.

integrals, asymptotic expansion, brief note, 1383. radio phase measuring systems, 186. various methods of airplane camera calibration, 1878.

Errors, propagation of, in spectrophotometric colorimetry, 804. Es, slant, some implications, 2304.

Essential, property of the Fourier transforms of distri- bution functions, 391.

similarity: a counter-example, 2548. Estimate for the density and motion of solar material from observed characteristics of solar radio

outbursts, 649. Estimating the standard deviation of a normal polulation, 713. Estimation of, correlation coefficients from scatter dia- grams, 1017. frequencies of thin elastic plates with free edges, RP2784.

parameters in certain stochastic processes, 334. quadrature errors for analytic functions, 1096. Etalons, et measures de frequence et d'intervalle de temps aux Etats-Unis d'Am^rique de 1954 a

1957, 2550. temps atomique et mol£culaires au National Bureau

of Standards, 2549. Etching fine points under controlled conditions, apparatus,

1628. Ethane, ethane-d6 , pyrolysis of mixtures, 291. internal barrier, 2603. Ethylene, combination bands, 206. infrared spectra, structure, 2833. Etude, infrarouges de certains solides condenses a partir de decharges en phase gazeuse, 2943. spectroscopique des produits de la decharge electrique dan L' Azote condenses a l'etat solide a tres basse temperature, prevues en faveur de 1'exis- tence d'Azote triatomique dan le solide, 2944. Euclidean spaces, isoperimetric inequality for closed curves convex in even-dimensional, 952. Euler means, Gibbs' phenomenon, 103. European experience with electronic computers, 1336. Evaluation, adhesion of organic coatings by ultracentrif- ugal and other methods, 715. adhesives for acoustical tile, 55. analytical methods by the sensitivity criterion, 2112. appearance, status of ASTM methods and standards

for, 3055A. automatic computing machines, 233. Boor-Quartermaster snag tester for coated fabrics and plastic films, 1337. bremsstrahlung cross sections at the high-frequency

limit, 2551.

coaxial slotted-line impedance measurements, 234. Coulomb wave functions along the transition line, 1018.

electronic data processing equipment, 1261. integral^ e-u2 -(x/u) du, 716. matrix inversion programs, 2814. new cuvette desitometer for determination of cardiac output, 714. resistance strain gages at elevated temperatures, 2420. small color differences: I. Visual observations, 3078.

tensile, compressive, torsional, transverse, and impact

tests and correlation of results for brittle cermets, RP2895.

various thermoplastic materials for use as iodine vapor barriers, 2892. width of cracks in concrete at the surface of rein- forcing steel by means of tensile bond specimens,

2113. Evaluation, active species trapped in a solid condensed from discharged nitrogen, 2551 A. water from cellulose, 547. Evaluation of lens distortion, inverse nodal slide, J 63C2,

105. modified goniometric method, J 63C2, 113. visual and photographic methods, RP2920.

Evidence for structural anomalies in pure cristobalite, 3048. Evolution of certified reference materials, 3078. Exact, earth-flattening procedure in propagation around

a sphere, J 64D1, 61. evaluation of the variances and covariances of order

statistics in samples from the extreme-value

distribution, 788. 322
solution for a cylindrical cavity containing a gyro- magnetic material, 2013.

solution for a gyromagnetic sample and measure- ments on a ferrite, 2552. Examples of the use of high-speed computers in statistics, 2302. Excess noise in microwave crystal diodes used as rectifiers and harmonic generators, 2114.

Excitation, mechanisms of the oxvgen 5577 emission in the upper atmosphere, J 63D3, 319. oxygen red lines in twilight, 2554. separation of pure high-order modes in large high-Q

cavities, 1708. surface waves on conducting, stratified, dielectric- clad, and corrugated surfaces, RP2807.

surface waves on plane and curved impedance boundaries, 2553. Exhaust-gas mixtures at elevated temperatures, determi- nation of viscosity, 989. Exhaust-pipe systems, wave action in diffusers, with

special reference to the scavenging of two-stroke

engines, 1679. Existence, identities for the coefficients of certain modular

forms, 1797. Existence theorems and extreme solutions for inequalities concerning convex functions or linear transforms,

2115. Expansion, engines for hydrogen liquefiers, J 64C1, 25. theorem for pseudo-analytic functions, 577. Expansions, uniform asymptotic, for Weber parabolic

cylinder functions of large orders, J 63B2, 131. Expansivity, viscosity, and density, molten alkali silicates, 422. Expendable modules as bases for disposal-at-failure maintenance, TN41 (PB151400).

Experiences with incomplete block designs: examples, 2116. Experiment, designs: fractional factorial experiment designs for factors at three levels, AMS54.

national physical standards and design, 2210. Experimental, cross section for photodetachment of elec- trons from H- and D-, 1338.

design, principles, 880. equipment for communication utilizing meteor bursts, 2117. evaluation of the oxygen microwave absorption as a

possible atomic frequency standard, 2555. evidence for the existence of abnormal OH rotational "temperatures" in low pressure flames, 1339. photodetachment cross section and the ionospheric detachment rate for Oi, 2556.

plating of gun bores to retard erosion, TN46

(PB151405).

production of nodular graphite in cast iron, 444. proof for the existence of nonthermal rotational

distributions of OH(2 2+) in flames. 1709. rapid access memory using diodes and capacitors, 392.

statistics, 445. study of the strength and fatigue of glass at very low

temperatures, 2014. temperature measurements in flames and hot gases, 1340.

test of parity conservation in beta decay, 2015.

theoretical study of kinetics of bulk crystallization in poly(chlorotrifluoroethylene), J 63Al, 67. Experimentation, Fisherian revolution in methods of, 335. Experiments, beta-decay of polarized nuclei, 2557.

cell Bi, Bi 2 03 , ZnCl,/ZnCl2 /ZnCl>, Zn between 450 and

510°, 2946.

electron interference, 1702.

fast coincidence, techniques and theory, 1911. high-frequency, at the NBS scatter sounding, 730. many factors, 2120.

multi-factor, 2995. operations research, design, 1670. parity conservation, scintillation counting, 2749. processing pictorial information with a digital computer, 2119.

statistical designs, 133.

solution of differential equations by Monte Carlo methods, 1019. Exploration of electrostatic and magnetic fields, 50. Explosions, atomic, temperatures, 1528. low pressure, ultraviolet spectrophotometry, 1565. pentaborane-air (lames, spectroscopic observations,

1883. Exponential, atmosphere, path antenna gain, J 63D3, 273. CRPL, reference atmosphere, Mono. 4. integral e-*'t-"dt for large values of n, RP2941.

integral for complex arguments, tables, AMS51.

reference atmosphere, Central Radio Propagation

Laboratory, J 63D3, 315. Exposure standards and radiation protection regulations, Expression in terms of molecular distribution functions for the entropy density in an infinite system, 2558. Extending the range of the NBS stiffness tester, 1020. Extension of Gauss' transformation for improving the

condition of systems of linear equations, 393. mode theory of VLF ionospheric propagation, 2450. Munsell renotation system, 2559. Munsell renotation system to very dark colors, 1710. second spectrum of zirconium into the infrared, 717. Sen- White paper on atmospheric oscillations, 1341. Extrema, Bessel function, relative, 104.

relative, of the Hermite orthogonal functions, 283. Extreme useful range of VHF transmission by scattering from the lower ionosphere, 2560. Extreme values, tensile strength, two early papers on the

relation between, 1219. theory, 3090. Extreme-value, distribution: table of the first moment of ranked extremes, RP2787.

results for indefinite Hermitian matrices, 2303.

theory, some applications, 1140. Extremum property of sums of eigenvalues, 1234. Eye, and sky, 2830.

protection, plastics for, 1547. F

F-region, eclipse of May 20, 1957, 121. F-scatter and sporadic-E program, TN48 (PB151407). F2 layer, at Hyancayo, Peru, lunar stratification, 83.

critical frequencies, 225. Fabric structures, design of impact-resisting, 3069. Fabric-phenolic laminates, cotton, 2063. Fabrication, of airborne electronic equipment, new techniques, 1415. polyester laminates, effects of humidity, 435. techniques for ceramic X-band cavity resonators, 2561.

Fabrics, coated, and plastic films, 1337. flameproof, 3050. rayon, properties, factors affecting, 446. rayon, properties of, 718. thickness and compressibility of, 898. woven in high temperature laundering, test for dimensional changes, 2802. Fabry-Perot interferometry, phase shift effects, J 64A3,

191. Facility for the evaluation of resistance strain gages at elevated temperatures, 2420.

Facilities for convenient manual reduction of ionograms, TN14 (PB151373).

Factoren, die die Eigenschaften von Reyongeweben

beeinflussen, 718.

Factorial, asymmetrical, arrangements, use of group di- visible designs, 2836.

fractional, experiment designs for factors at three

levels, AMS54.

fractional experiments of 2m3" series, 2568.

Factors, affecting radio propagation in the TV and FM

bands, 1342.

affecting the accuracy of distortion measurements made on the nodal slide optical bench, 2948.

323
affecting the dimensional stability of the Ag-Sn

(Cu-Zn) amalgams, 1493.

affecting the properties of rayon fabrics, 446.

affecting the water vapor permeability of leather,

57. converging, method for the determination of, applied

to the asymptotic expansions for the parabolic

cylinder functions, 366. influencing the behavior of polymers exposed to high- energy radiation, 1343. influencing the cutting characteristics of rotating dental cutting instruments, 1494. influencing the road wear of tires, 308. properties of rayon fabrics affect, 718. Fading, characteristics of regular VHF ionospheric propagation, 1495. properties of a signal imposed on a constant signal, C599.

rate recorder for propagation research, 2949. False negative permanent strains observed with resis- tance wire strain gages, 2950. Faraday, mass measurements, 573. elemental constants and electricity standards, 2593. Farm, milk tank testing, 1344; 1711. Fast coincidences with Cerenkov counters, 447. Fatigue and, static tests of flush riveted joints, 1345.

crack, distinction between initiation and propagation,

1925. properties of high strength steels, 2951. strength of glass at very low temperatures, an experi- mental study, 2014.

stressing, damaging effect, 1566. Fax and telemetering: how FM expedites weather data

distribution, 69. Federal basis for weights and measures, C593. Feedback, amplifier with negative output resistance for magnetic measurements, 2421.

amplifiers, tuning systems, 352. amplifiers with stabilized output impedances, 719. FeO, new infrared band system, 368. Fermi beta-distribution function, numerical evaluation,

100.

Ferrite, cores, RF permeameter techniques for testing, 2746. exact solution for a gyromagnetic sample and measurements, 2552.

lattice in low-alloy steel, elastic and plastic behavior,

1691.

Ferrites, characteristics and present requirements, 2051. magnetoelastic properties, TN49 (PB151408). Ferromagnetic materials, measurement of core losses, RP2865.

Ferrous and manganous carbonates, thermal decomposition, 1960.

Fiber, papers, glass, 1026.

structure, textile, on wear resistance, effect, 610. Fibers, different, impact properties of yarns made from,

734.

electron microscopy of, 4. hardwood, resin bonding in offset papers, 302. properties and behavior of, when impacted at high

velocities, RP2866.

properties of, 1121. synthetic, properties of some experimental map papers

containing, 2703.

Fibre, muscle-ATP system, 2986. Fibrous, insulations bounded by reflective surfaces, ther- mal resistance, BMS151.

macromolecules, reversible contractile processes, 2743. polyethylene, low-angle X-ray diffraction, 2616.

Field, emitter point projection X-ray microscope, 1982. ground screen, radiated from a monopole, 1688. strength calculations for E.L.F. radio waves, TN52

(PB161553).

Field-strength, meters, commercial, calibration, 407. variations recorded on a VHF ionospheric scatter

circuit during the solar event of February 23, 1956, 2121.

Fields in electrically short ground systems, J 63D2, 175.

Fifth-order aberration in an optical system, 235.

Fifty, oblique transmission experiment near magnetic

equator, 2626. years of electrochemical theory, 448. years of electrodeposition, 449. years of scientific standardization, 236. years of signal lighting, 2562; 2952. Filaments, electrically heated, on-off temperature control 2660.

Filling resins, direct, color stability, 854. Film, badge dosimetry: how much fading occurs? 1021. cathode, studies by the drainage method, 1282

dental X-ray, 2091.

for X- and 7-ray dosimetry, stabilization processing

1891.

polyester, tensile properties, 2354. Film-forming properties of cellulose acetate propionates, Films, cellulose acetate, degradation, 2924. bituminous materials, uniform, method of preparing, oleophobic, on metal fatigue, effect of, J 64C2, 147.

plastic, and coated fabrics, 1337.

plastics, comparison of methods for measuring the

tensile and tear properties, 1290.

plastic, properties of, 1122.

plastics, irradiated, 3056.

thin, energy loss of electrons in passage through, 1014.

Filter radiometry and some of its applications, 720.

Filtering, device, 47.

Filters, for the infrared region, 450.

pass, Zeeman-split absorption lines, 3115.

single frequency, design, TN23 (PB151382).

Finding, chemical records by digital computers, 2122.

list, a multiplet table of astrophysical interest, TN36

(PB151395).

Finite, groups, representations, 499. matrices, communtativity, 2060.

Fire, extinguishment by means of dry powder, 2123. research at the National Bureau of Standards, 2124.

research, field of, some activities of the National Bureau of Standards, 1870. research in the United States, 2563.

tests, proposed criteria for defining load failure of beams, floors, and roof constructions during, J 63C2, 121.

First, meeting on radio climatology, 2564. report of the special committee on world-wide iono- spheric soundings, 1712. Fisherian revolution in methods of experimentation, 335. Fitting a straight line to certain types of cumulative

data, 2125. Fixed capacitors of electronic circuits, 238. Fixture unit ratings as used in plumbing system design, 239. Flame, calorimetry, constant pressure: combustion calo- rimetry with fluorine, J 64A1, 49.

cool, oxidation of propane-2-C13

, products, 2702. emission spectra, kinetics of OH radicals, 475.

gases, sampling, RP2818.

photometric determination of manganese in cement,

1930. photometric determination of strontium in portland cement, 1346.

spectra, infrared, 1366. speeds, measurement of, by a nozzle burner method, RP2867.

spread properties of building finish materials, 2565. Flameproof fabrics, 3050. Flames, 1347. acetylene-oxygen, 2311. atomic: spectra "temperatures" and products, 1268. atmospheric pressure, rotational and vibrational "temperatures" of CH in, 816. bunsen, 207.

effects of self-absorption of rotational "temperatures"

of OH in, 700. hot gases, experimental temperature measurements,

1340. low pressure, 1339. 324
methane-air, rotation temperatures of OH, 304. pentaborane-air and explosions, spectroscopic observations, 1883.

several, rotational temperatures of OH, 534. Flammability of materials using a radiant energy source, method for measuring, 1593.

Flares, limb, 2882. Flash photolysis of chlorine monoxide, 2357.

Flatness of iarge surfaces, testing of, bv interferometer, RP2943.

Flex tension test for leather, 917.

Flexible polymer molecules, crystallization, 1924.

Flexibility of thin porcelain enameled sheet steel, 2126.

Flexural cracks in reinforced concrete beams, 2566.

Flexure, center of, upper and lower bounds, J 64B2, 105.

Floor, wall, and door constructions, sound insulation of, B MSI 44, 2d Suppl.

Flooring, conductive, for hospital operating rooms, J 63C2,

125; Mono. 11. materials, 479. Floors and floor finishes, 130.

walls, transmission of airborne noise, 2397. Flow, behavior of concentrated GR-S rubber solutions, 58. capacities of pneumatic components, determination and correlation of, C588.

characteristics and degradation of polymer solutions,

effects of capillary shape, RP2839.

conversion kinetics of ortho and parahydrogen, 2953. measurements, review of some methods, 1131. Fluctuating signal imposed on a constant signal, on the theory of fading properties, C599.

Fluctuations, in harmonically related bands, correlation

of solar noise, J 63D3, 293.

refractive index of the atmosphere at microwave

frequencies, 240.

Fluid, conductivity of, contained in a cylindrical vessel, measurement, 2233. exchange at the margins of dental resotrations, 451. heat flow in, with eddying flow, 1727. normal, concentration in liquid helium II below 1° K, 774.

Fluids, cold, valve for, 1570. superposed, stability of oscillations, 1890. Fluorescence, and average lifetime of excited OH (

2 S+) in flames, 1348.

teeth: a means of investigating their structure, 452. teeth reveals structure, 721. Fluorescent, lamps, 134, color-rendering properties, specifications of, 833. sources of illumination, color rendition, 1651. sunlamps in laboratory aging tests for plastics, 1713. Fluoridation, 2567.

Fluoride, lithium: heat content from 0° to 900°, the melting point and heat of fusion, 1053.

perchloryl, dipole moment, 2089.

tertiary butyl, 2820.

Fluorides on infrared transmittance of certain silicate glasses, 2933. Fluorinated, polyphenyls by mass spectrometer, analysis, 1263. polyphenyls, synthesis and properties, 1521. Fluorination of haloaromatic compounds, RP2938.

Fluorine, combustion calorimetry: constant pressure flame

calorimetry, J 64A1, 49. compounds, properties of, the vibrational spectrum

of tetrabromoethylene, 1825. 1-Fluoro-l-chloroethylene, vibrational spectrum, 1576. Fluorocarbon bond energies obtained by electron impact,

580. Fluoro carbons, aromatic, reactions with hydrogen, RP2940.

Fluorotrichloroethylene, vibrational spectrum, 1577. Flush riveted joints, fatigue and static tests, 1345. FM, adapter, wide-band reducted interference, 169. data reduction from magnetic tape recorders, 722. modulation, wireless microphone uses, 2869.

television broadcasting stations, variation with fre- quency of the signal range, 347.

television service, statistical approach to the problem

of multiple radio interference, 378. TV bands, factors affecting radio propagation, 1342. Foams and powders, heat transfer, 2147. Focusing, defocusing, and refraction in a circularly stratified atmosphere, J 64D3, 287. Forbidden lines in the spectra of impure mercury 198, 60. Forecasting of disturbed high frequency communication

conditions, 2127. Forces on cylinders and plates in an oscillating fluid, RP2857.

Forehead and mastoid, mechanical impedance, 1404. Formal, power series for log e

xe", 1931. procedures for connecting terminals with a minimum

total wire length, 2128. Formation, of ozone from atomic oxygen at low temperatures, 2954. polymer crystals with folded chains in dilute solution, theory of, J 64A1, 73.

silver sulfide in the photographic image during fixa- tion, J 64C1, 65. titanium tetrachloride, heat, RP2928.

Formula, Fox's escalator, for latent roots, 386. Formulas, for calculating the error function of a complex

variable, 241. finding the arguments for which a function has a given derivative, 242. hyperfine structure, for LS coupling, 733. inverse osculatorv interpolation in the complex plane, RP2792.

numerical differentiation in the complex plane, 453. numerical integration of first and second order dif- ferential equations in the complex plane, 61. Formyl radical, the energv dissociation of the C-H bond,

2813.

Forster's method, effect of suspension position on apparent

values of internal friction determined by, 2530. Foundry crucible service life, 454. Fourier, transforms, certain, of distribution: II. 965. transforms of distribution, 202. transforms of distribution functions, essential property, 391. Fox's escalator formulae for latent roots, alternative derivations, 386. Fractional, factorial experiment designs for factors at three levels, AMS54.

factorial experiments of 2m3" series, 2568. Fractionated, microbiological of the hydrogen isotopes, 2635. Fractionating process of adsorption, 156. Fracture phenomena and molecular weight in polymethyl

methacrylate, 2569. Fragmentation of waterdrops in the zone behind an air shock, RP2843.

Free, energy function, specific heat, enthalpy, entropy,

viscosity, and thermal conductivity of steam,

compressibility factor, density, 1657. machining copper, low-temperature thermal conductivity, 1393. precession determination of the proton gyromagnetic

ratio, 2422.

radical stabilization in condensed phases, 2570.

radical statistics, 2571.

radicals at low temperatures, stabilization, Mono.12;

2316.

radicals, luminescence of solid nitrogen (4.2°k) coning atoms, 2622.

radicals, frozen, 2129.

radicals, frozen: the problem and the program at the National Bureau of Standards, 2130.

radicals research at the National Bureau of Standards,

2973.

radicals research symposium, 2572.

radicals, stabilized, 2774.

Free-air ionization chambers, design of, H64.

Free-radical degradation, high-speed computations in the

kinetics, 2587.

Freezing, of water in pipes and vessels, 861. point of engine antifreezes, determination, 331. 325
points, apparatus for determining, at saturation pres- sure from time-temperature freezing and melting

experiments, 26. Freon-12, determination of water content in, circulating

in a refrigeration system, 990. Frequencies, above 50 Mc, gapless coverage in air-to- ground communications, 457. audio, measurement of voltage ratio, 2191.

high, observable over long distances, new kind of radio propagation, 369. ionospheric critical, and sunspot number for different sunspot cycles, 571. low, effective electrical constants of solid, 2352. low radio, calculations of ionspheric reflection coeffi- cients, 2044. low radio, transmission loss curves for propagation,

2851.

low, sweep, polarization measurements, 938. lowest usable, and maximum usable, for the path Washington to Resolute Bay, 1062. microwave, atmosphere, 240. optimum, for outer space communication, J 64D2, 105. Frequency, and amplitude stability of the cathode-coupled

oscillator, 62. audio, power amplifier circuits, a survey, 187. backscatter, sweep, 1158. band 152-162 Mc which is available for marine radio communications, propagation characteristics, 1945.

carrier, dependence of the basic transmission loss in tropospheric forward scatter propagation, TN53

(PB161554).

characteristics, comments on the attenuation, 2059.

characteristics of VLF radio waves, 2345.

characteristics versus attenuation, 205. continuous function, 1414. dependence of VHF ionospheric scattering, TN9 (PB151368).

dividers, microwave, 89. dividers, modified locked-oscillator, 261.

factors, world maps of f2 critical frequencies and max- imum usable, TN2 (PB151361).

generator, wide range, 170. high, impedance standards at the NBS, 2583.

high, induced electroluminescence in zinc sulfide, 1728.

high, limit of 500-kev bremsstrahlung, polarization, 2694.

high, measurements, instruments for, 1043. high precision automatic, comparator and recorder, 1356.

high, standards of the Electronic Calibration Center, NBSBL, 2585.

high, very, field-intensity meters, 739.

high, very, transmission loss, 750. intermediate, gain stabilization with inverse feedback,

78. low, band, some results of sweep-frequency investigation, 1146.

low, ionosphere echoes, note on the polarization, 371. low, propagation, 229.

low, radiation from a horizontal antenna over a spherical earth, 1761. low, standard transmissions, 2179.

multipliers and converters for measurement and control, 1349. polya functions, 782. power requirements for a worldwide standard-fre- quency broadcasting station, J 63D1, 35. primary standard of, 737.

radio, mass spectrometer, 117. range, 175. range from 50 Kc/s to 25 Mc/s, 2064.

signal range of FM and television broadcasting stations, variation, 347.

single, filters, design, TN23 (PB151382).

spectra of very-low-frequency atmospherics, measured, J 64D1, 41. standard at low temperature, 1589. standard, atomic, 2555.

standard, broadcast at very low frequency, 2270. standard, NBS primary, 872. standard, station WWVH, 42. standard, transistor, 90D.

standard, transmission and time signals, 3054A.

standards, 456. standards, high stability, 1359. standards, precision quartz resonator, 1111. standards, spectral lines, 550. sweep, backscatter observations, note on, 924. time in Hawaii, measuring, 257. time, standard, 1190. time, standard, atomic clock, 148. time standards, half-precision, 18. time standards in the U.S.A. from 1954 to 1957, 2550. transmissions, WWV standard, 2871; 2872.

ultra-high, characteristics of the magnetic attenuator,

663.

ultra-high, magnetic attenuator, 902. very high, ionospheric scatter communication, 1958

critique, 2505A.

very high, ionospheric scattering, modulation studies, 2639A.

very high, propagation by ionospheric scattering- survey of experimental results, 1971. very high propagation measurements in the Rocky

Mountain region, 1972. very-high transmission loss, 870. very low, emissions generated in the earth's exosphere, 3097. very low, ionospheric propagation, 2203. very low, noise, 2003. very low, propagation in the presence of a transverse magnetic field, J 64D3, 265. Frequency-deviation, meter plots drift, 455; 723. Frequency-high, pulse transmitters, 1056. Frequency-shift, keyed carriers, 2723. radio photo-transmissions, spectrum, 1884.

reception, 1071. Friction and endurance of prelubricated and unlubricated

ball bearings at high speeds and extreme temperatures, J 63C1, 19. Frozen, free radicals, 2129.

free radicals: the problem and the program at the National Bureau of Standards, 2130. products from the nitrogen microwave discharge, thermometric study, 2847. Fuel-immersion, laminated plastics, 50. Fuels, aircraft, 1128.

aircraft, AN-F-58, net heat of combustion, 265. engine, multistage autoignition, 1411. Fully convex normed linear spaces, 1350. Function, generator for two independent variables, 1590. aid in the fitting of kinetic data to a rate equation,

1983. Functions, generating, smoothing operations, 783. Hermite orthogonal, 283. positive harmonic, of ultraspherical polynomials, 276.

struve, properties, 2269.

value, class of, 1. Fungicides on deterioration of leather, 2353. Fungicidal effectiveness of compounds applied to leather, 2131. Fungicides, leather, laboratory and field exposure studies, 1754.

leather, studies, 2788. Fur skins, aging of karakul and seal, 19. Furnace, gradient, high-vacuum temperature, 2588. improved hydrogen atom beam, TN47 (PB151406).

Furnaces, thoria and resistor-type, construction and

operation, 328. two resistance-type hot-pressing, for laboratory use, 2399. Further contributions to the solution of simultaneous

linear equations and the determination of eigen values, AMS49.

experiments on /3-decay of polarized nuclei, 2132. 326
identities and congruences for the coefficients of modular forms, 2573.

infrared measurements with a cesium iodide prism molecular spectroscopy, 1351.

studies of an electronic thickness gage: circuitry operating characteristics, and calibration, 2133.

studies of the influence of a ridge on the low-frequency ground wave, RP2884.

Future developments of electronic data processing systems,

2955. Fused salts, electrolytic preparation of molybdenum, 2811. Fused-quartz glass for ultraviolet, visible, and infrared wavelengths, index of refraction of, 1035. Future office and factory automation, 1715. G

Gage, area, a reduction of, for use at low temperatures,

electronic thickness: circuitry, operating characteristics, and calibration, further studies, 2133.

piston, 2103.

thickness, ceramic coatings, 13. Gages, strain, bonding agents for high-temperature, 2474. wire resistance strain, cryogenic characteristics, 2073. w

T ire strain, 2950. Gaging and testing farm milk tanks, 2134. Gain stable mixers and amplifiers with current feedback,

1022. Gains of finite-size corner-reflector antennas, 2574.

Galactic radio waves, 63, Gallium, alloys of, with powdered metals as possible replacement for dental amalgam, 1613. aluminum phosphate, low cristobalite type, crystal structure, 1923. antimonide, 1007. copper-tin alloys, some physical properties, 1876. orthophosphate, anhydrous gallium, temperature

inversion, 1916. vapor, mass spectrum of, 758. Galvanic, corrosion theory for adherence of porcelain enamel ground coats to steel, 2358.

couples, 138; 141; 142; 143. Galvanomagnetic, effects in InSb, 1352.

effects in n-type indium antimonide, 2135.

effects in n-type InSb at 4.2° K, 1716.

effects in p-type indium antimonide, 2136.

oscillatory effects in n-type indium arsenide, 2678. Galvanometer efficiency as a design parameter, 1717. Games with random payoff matrices, 2137. Gamma, and incomplete gamma function, 3047.

cassiopeiae, variations, TN21 (PB151380).

function, 2974.

irradiation of polymethyl methacrylate and polysty- rene 2138. radiation from Ag105

, 1718. Gamma radiation from Zn63

, 2956.

radiation, multiple-scattered from a plane isotropic source, angular distribution, 1265. radiation near the interface between two media, cal- culation of energy dissipation, 2043.

radiations, penetration of, 2102. Gamma rays, and X-, photographic dosimetry, 2611. backscattering of the cobalt-60, from infinite media,

959. cobalt-60 and cesium- 137, with a free air chamber, measurement of, J 64C2, 87. isotropic sources through aluminum and concrete, penetration, TN11 (PB 15 1370). oblique incidence, 1171.

similarity principle in the backscattering of, 934. X-rays, absorption by concrete, 1250. Gamma-ionization chambers, improvement in response of

4-ir, 735. Gamma-ray, attenuation, 724. backscattering and transmission, Monte Carlo cal- culations of, 1076. degradation spectra, an approximate expression for, RP2788.

diffusion, application of the Monte-Carlo method to a problem, 1618.

doses near the interface between two media, measure- ment, 2628. dosimeter, neutron-insensitive, 2211. dosimetry and X-, stabilization film, processing, emission of radium, determination of, RP2801.

measurements by the magnetic analysis of Compton

electrons, 725. penetration into shelters, RP2827.

penetration theory relevant to shielding problems.

aspects, 2028. penetrations, 847.

scintillation spectrometer pulse-height distributions 2856. spectroscopy, 2139. transport theory, 3051. X-ray spectra between 0.01 and 20 Mev, 1955. Gapless coverage in air-to-ground communications at frequencies above 50 Mc, 457. Gas, absorption systems, 2524.

analyzer, unique thermal conductivity, 2443.

clouds, ionization and shock fronts in collisions, 2496A C02 , nonpolar, 1074. cosmical, dynamics, 2697.

discharge, low temperatures, 3052.

discharge, spectra emitted from a solid nitrogen con- densed at 4.2° K, 1881. elementary phase reactions at high temperatures,

1433.

film, electrolyzed, 865. high pressure, handling equipment for autoclaves in chemical research, 2154.

ideal, thermodynamic functions, high-speed computation, 1357.

internal, counting, 2714.

liquefied, storage vessels, 3049.

natural, analysis of, 25. pound of, 927. properties in terms of molecular clusters, representation of, 815. streams, measurement of high temperature, 85. temperatures, measurement of, by immersion-type

instrument, 867. thermodynamic functions, high-speed machine computation of, 1030. tube stabilized power supplies, 1353. volumes of, meter for timing the flow, 365. Gas-exhaust mixtures at elevated temperatures, determi- nation of viscosity, 989.

Gas-filled candlepower standards, 2860. Gas-free liquid scintillators, temperature effects, 1915. Gaseous, discharges, energetic species trapped at 4.2° K,

2942. heat conduction in dewars, calculation, 2482.

nitrogen, thermodynamic properties, 1964.

state, infrareds of certain solids, 2943. systems, ionized, 2632; 2988. Gases, and vapors on glass spheres, adsorption, 1609. calculation of properties, 2664. compressed, microwave absorption; saturated hydrocarbons, 1778. condensed, liquid level indicator, at low temperatures,

1052. condensed, low-temperature microcell for infrared study, 2619. condensed, temperature microcell for infrared study,

2800. exhaust, corrosion of aluminum alloys by, 979.

five monoatomic, propagation of sound, 1823. flame, sampling, RP2818.

high-velocity exhaust of jet-type engines, 1602.

hot, and flames, experimental temperature measurements, 1340.

hot, energy transfer in, 1016.

hot, temperatures, 1882. high densities, contribution in the study of transport phenomena, 1296.

ionized, internal energy, 3081. 327
ionized, thermal diffusion, 2844.

liquefied, ball bearings submerged in, 3063.

liquefied, long distance transfer, 2177

liquefied, performance of pumps, 2243.

liquefied, single-phase transfer, C596.

liquefied, with sharp-edged orifices 2983. low pressure, an eleven megacycle interferometer for, 648. monatomic, trapped at 4°K, 2546. nonpolar, generalized tables of corrections to ther- modynamic properties, 1721. properties of, 259. pure diatomic, 1326. rare rotating or expanding, cosmic examples of heat

conduction, 2920. sound in, combined translational and relaxational dispersion of, 971. survey of experimental heat capacities, 843. thermodynamic properties of, at high temperature, RP2916.

various buffer, narrow hyperfine absorption lines of C.133

, 2643. water, measurement, RP2864.

Gasoline, aviation, and its correlation with other properties, net heat of combustion, 2646. Gassing of dry cells, 2359. Gated-beam mixer, 243. Gauss', speeding up device in the theory of single step

iteration, 2659. Gerling on relaxation, 244. transformation for improving the condition of systems

of liner equations, extension, 393. Gaussian quadratures of high order, abscissas and weights

for: values for n = 64, 80, and 96, RP2875.

functions, 1221. Gegenbauer and Legendre functions, general, addition theorems, 1253. Gegenschein, absolute photometry, 1919. General, precepts for programers, 545.

relations between fluxes from collimated point and

plane sources of radiation, 2957. system, signal, 826. Generalization, normal basis in abelian algebraic number

field, 1791. theorem of Konig. 1719. theorem of Osgood to the case of continuous ap- proximation, 64. Generalizations of identities for the coefficients of certain modular forms, 1720. Generalized, commutators of matrices and permutations

of factors in a product of three matrices, 1023.

tables of corrections to thermodynamic properties for nonpolar gases, 1721. Generating functions of the Jacobi polynomials, 1426. Generation, and testing of pseudo-random numbers, 1722. Bessel functions on high speed computers, 2140. Coulomb wave function by means of recurrence re- lations, 1532. Generator, electron-tube curve, 440. frequency, wide range, 170. high-power square-pulse, 463. microwave harmonic, 1662. phase, for tropospheric research, 1805.

pulse, and high-speed memore circuit, 1827.

pulse, delay incremental, 191. pulse, high-power, 627.

pulse-pair, crystal-stabilized, 1302. Generators, diathermy, 429. Genuine cooperation between manufacturers and weights and measures officials, 458. Geographic, and temporal distribution of polar blackouts,

1024.

distribution of geophysical stations on the polar cap, 2141. Geographical and height distribution of the gradient of refractive index, 727. Geological application of extreme-value methods to inter- pretation of cobbles and boulders in gravel

deposits, 1723. 320

Geomagnetic, disturbance and velocity of slow-drift solar radio bursts, 2958. disturbances, solar H a filaments, 1489.

eclipse phonomena, survey, 1908.

effects of high-altitude nuclear explosions, 2959. observatories and thesaurus of values, 252. Geometric factors in electrical measurements relating to corrosion and its prevention, 1354. Geometrical, characterization of nuclear states and the theory of angular correlations, 726. factors in fatigue, toric bending specimen for investi- gation, 2442.

optics at V.L.F. sky wave propagation, 2360. Geometry, 2500. Boolean, 403.

integral and differential, metric methods in, 764. metric differential, 87. Geophysical, stations on the polar cap, geographic distri- bution, 2141.

year, International, July 1, 1957-December 31, 1958, radio noise data, TN18 (PB151377). German syntax patterns, proposals for the mechanical

resolution, 290. Germane, methyl, microwave spectrum, 2992. Germanium below room temperature, thermoelectric power of, 897. infrared photoconductivity due to neutral impurities

in, 1039.

single crystals, thermoelectric power in, 896. tetramethyl, small quantities, preparation, 517. Giauque-Kelving proposal, 1025. Gibbs, phenomenon for a class of linear transforms, 500. phenomenon for Euler means, 103. phenomenon for Hausdorff means, 65. Gimbals, high vacuum, 1731.

Glass, analysis, recent trends, 1126. arsenic sulfide, properties, RP2774.

australite (meteoric), 1636.

boroscilicate, after heat treatment, 1844. dewars for optical studies at low temperatures, 2575. fatigue and strength at very low temperatures, an experimental study, 2014.

fiber papers, 1026.

fiber polyester laminates containing a calcium car- bonate filler, determination of resin content, 1672.

fibers, paper from, manufacture, 477. formation in polymers: I. The glass transitions of the

poly-(n-alkyl methacrylates), 2142. formation in polymers. II. The system rubbersulfur, RP2944.

formation, stable, shape of the liquidus surface as a

criterion of, RP2872.

low-loss and quartz, small precision bottles, 2224.

optical, production in the United States, history of, 731. radiant, heating panels, 807.

silica, noncrystal ionic model for, RP2782.

spheres, adsorption of gases and vapors, 1609. strength and fatigue of, at very low temperatures,

2318.

transition temperatures of copolymers, 2576. volumetric apparatus, testing, C602.

Glass-fabric reinforced polysters, 1004.

Glass-fiber reinforced plastics, effects of molding pressure on strength properties, 2533.

Glasses, alkali silicate, density formula for, RP2915.

amelung, compared with some modern commercial

glasses, 387. binary alkali borate and silicate at high pressures, compressibility, 1292. binary alkaline-earth borate, at high pressures, compressibility, 1658.

elastic moduli, at elevated temperatures by a dynamic

method, 1692. infrared energy, transmittance, 1561. molten alkaline-earth borate, with three mole per- cent of potassium oxide, 2864.

optical, relative stress-optical coefficients, RP2779.
sag point as a reference point in heating of, RP2791.

silicate, 2933.

silicate, during annealing, structural rearrangements,

1901. sodium titanium silicate, properties, RP2890.

structure of alkali silicate binary, RP2854.

svstem barium oxide-boric oxide-silicate, some properties, 2763.

three color achromats, 3043.

transmitting, infrared, 1177.

zinc borosilicate, properties, RP2930.

Glassware, railroad-signal, an evaluation of the luminoustrasmittance requirements, RP2849.

Glassy state, polystyrene in, thermal and photochemical

processes in, 1958.

Gloss, color, and haze, measurement of, 760. measurements—past, present, and future, 2143. meter comparisons, 1724. Glucose means of sodium chlorite, 1310.

Glvcol, polvthvlene, electrolytes, punched-cell batteries, 1828. Glycosylamines, mutarotation, hydrolysis, and rearrange- ment reactions, 2642.

Gold, bonding of to fused silica, effect of oxygen, RP2942.

Gold, castings, effectiveness of vacuum investing in the

elimination of surface defects, 697. copper, molybdenum, silver, tantalum, and gold at 662 kev, total photoelectric cross sections, 3101.

electron scattering by, distributoin, 1317. Goniometer, automatic integrating pole-figure, preferred

orientation in stark rubber, 1454.

versatile, for projection photometry, 904. Goniometric method, evaluation of lens distortion by

the modified, J 63C2, 113. Goniophotometric reflection curves, analysis, 397. Goudsmit and Bacher's theory of atomic spectra, comparison of first, second* and third approximations,

2492. Government, and industry use of common standards,

2144.

researchers, 158.

specifications, 1725.

specifications, sources and identifying symbols, 549. Government's bookstore, 2361. Gradient reflections, nature, 586. Graduation of precise circles, 862. Graphical, interpretation of a three-components theory

of chromatic adaption in terms of the CIE

chromaticity diagram, 918. method for single-point determination of intrinsic viscosity, 1235. solution of the single-degree-of-freedom vibration problem with arbitrary damping and restoring

forces, 2145.

Graphite, carbon at 450° C, reaction of carbon monoxide,

2717.

natural, and refractoriness of the ashes, chemical analyses, surface area, and thermal reactions of, 665. Graphites, natural, oxidation studies, 1437. Gravitational, and thermal excitation of atmospheric oscil- lations, 1555. thermal oscillations in the earth's upper atmosphere,

1726. Grav tin crystals and their rate of growth, on the quality, 2672. Grazing, angles, diffraction of electromagnetic waves by smooth obstacles, J 63D2, 181. angles, study at 1,046 megacycles per second of the

reflection coefficient of irregular terrain, J 63D2,

235. Grease consistometer is modified to operate at constant

shear rates, higher viscosities, 245. Green coronal line intensity and geomagnetism, 2960.

Grid, parallel wire, transmission and reflection, J 63D1, 87. Grotrian diagrams, partial, of astrophysical interest, 1758.

Ground, homogeneous curved, transient field of vertical

dipole, 1967. systems, electrically short, fields, J G3D2, 175. wave pulse around a finitely conducting spherical earth from a damped .sinusoidal source current, 3024. waves, transient radiofrequency, over the surface of a finitely conducting plane earth, RP2844. Groundwood papers, effect of light, 693. Ground-based radio ducts, climatology, J 63DI, 29. Ground-to-air cochannel interference at 2900 Mc, 459. Ground-wave propagation, RP2770.

Growth, and infrared transmission of cesium iodide crystals, 460.

preferentially oriented aluminum single crystals, RP2868.

Guayule and chilte rubbers, 119. Guide to tables on punched cards, 177. Gun bores, chromium, 1647. chromium plating, 1648. retard erosion, experimental plating, TN46

(PB151405). Gyromagnetic, materials, cavity containing, 2013. proton, ratio, 2422; 2706. sample and measurements on a ferrite, exact solution, 2552. H3 complex, application of configuration interaction, 2027. HAE coatings, notes on post-treatment, 1786. Hafnium, spectra, improved description, RP2904.

spectrum of, 1208.

Half- life of 863. Half-planes and ribbons, surface currents exicited by an

infinite slot, 1907.

Halloysite, kaolinite, and a related mineral in clays and

soils, criteria for the characterization, 420. Haloaromatic compounds, fluorination, RP2938. Handbook of physics, contributions: 2500. Arithmetic. Color vision and colorimetry. Control mechanisms.

Electrolytic conductivity and electrode processes. Electronic circuits. Elements of probability. Geometry.

Integral equations. Neutron physics. Nuclear electromagnetic radiations.

Statistical design of experiments. Thermometry and pyrometry. Handmade bolts support the Capitol dome, 2577. Hankel, determinants, AMS49.

integrals of order zero, tables relating, errata, 147. Hardwood fibers in offset papers, resin bonding, 302. Haringx diaphragm theory, invited discussion, 2167. Harmonic, generation with ideal rectifiers, 2578.

oscillators, 1847. subharmonic, and linear functions of two variables, 280. Harmonics, radiated, measurement of, source of error, 377. Hausdorff means, Gibbs' phenomenon, 65. Haystaq system: past, present and future, 2815. Hazards from static electricity, 461. Haze, color, and gloss, measurement of, 760. HCO, OH, and CH in flame spectra, using deuterium as

tracer, mechanism of formation, 868. He* scale of temperatures, 1958, J 64A1, 1; Mono. 10. Head regulator for cutoff valve, 2146. Hearing, mechanistic aspects, 2987. Hearing, normal threshold, research, 2735. Heart pump, variable, permitting independent control of

rate, output, and ejection velocity, 381. Heat, and ultraviolet aging of poly (vinyl chloride), RP2863.

capacities of ten technically important gases, 843. capacity and enthalpy from 0° to 900° C of three nickel-chromium-iron alloys of different carbon

contents, RP2870.

329
capacity of aluminum oxide, RP2848.

capacity of aluminum oxide in the range 300° to 700°K, 2362. capacity of crystalline dextrose between 25° and 95°

C, 246. capacity of potassium and three potassium-sodium

alloys between 0° and 800°, the triple point and

heat of fusion of potassium, 462. capacity of sulfur from 25° to 250°, the heats and

temperatures of transition and fusion, 3079. capacity standards for the range 14° to 122° K, 729. combustion (net) and aniline-gravity product of air- craft fuels, relation between, 1128. combustion with a bomb calorimeter, precise measurement, Mono. 7. conduction, cosmic examples, in very rare rotating

or expanding gases, 2920. degradation of collagen by, 2511.

delivery in a compressible flow and applications to hot-wire anemometry, 247. flow in a fluid with eddying flow, 1727.

fusion, and heat content of lead, 1027. fusion and the melting point, heat content from 0° to 900°, lithium fluoride, 1053. gaseous conduction in dewars, calculation, 2482. mixing of polybutadiene and benzene, RP2921.

net of combustion of AN-F-58 aircraft fuels, 265. net of combustion of aviation gasoline and its corre- lation with other properties, 2646. pump, 1227. reaction of diborane with water and the heat of for- mation of boric oxide, RP2927.

reducing, leak through support members in liquefied gas storage vessels, 3049.

specific, enthalpy, entropy, free energy function, vis- cosity, and thermal conductivity of steam, compressibility factor, density, 1657.

specific, of beryllium between 0° and 900° C, 312. treating variables on the martensite transformations

in SAE 1050 steel, 1186. treatment, 199. treatment affects properties of enamel-steel composites, discussion of the paper, 2525. treatment of the susceptibility of sand cast aluminum

alloy 220 to stress corrosion cracking, 2349.

units and temperature scales for calorimetry, 1355. Heat content, of zirconium and of five compositions of zirconium hydride from 0° to 900° C, RP2878.

lead from 0° to 900°, and the heat of fusion, 1027. potassium borohydride, RP2828.

sodium borohvdride and of potassium borohydride from 0° to 400° C, RP2828.

study, some thermodynamic properties, 2839. Heat of formation, of boron trichloride, RP2956.

potassium calcium silicate, RP2955.

sodium calcium aliminate, RP2887.

tetrafluoromethane, 1533. titanium tetrabromide, RP2932.

titanium tetrachloride, RP2928.

titanium tetraiodide, J 63A2, 161. Heat transfer, boiling liquid nitrogen and hydrogen flow- ing axially through narrow annular passages, 2581

effect of internal radiant, on temperature distribution, thermal stress, and deflection in box beams, RP2949.

foams and powders, 2147. laminar flow, 2579. laminar flow through a tube, RP2937.

measurements on refrigerated-food trailers, 2580. Heat-flow analysis, transient, electrical-analog method

for, RP2892.

Heated, electrically filaments, on-off temperature control, 2660. Heating, aerodynamic, 2889.

control, cryostate, amplifier, 2090. elements, silicon carbide, spectral emittance of, RP2810.

glasses, sag point as a reference point in, RP2791.

panels, radiant glass, 807.

Heats, adsorption from charge-transfer complex theory, 2582. combustion of some peroxides and the heats of for- mation of acetate, propionate, and butyrate

radicals, 2148. formation of diborane and pentaborane, RP2901.

liquid metals and liquid salts, specific, 2306.

specific, of collagen and leather, 1502. temperatures of transition and fusion, 3079. wetting of collagen, leather, and other organic and

fibrous materials, 1028. wetting of modified collagen and other materials, 2149. Height, curves, virtual, joint use of the ordinary and ex- traordinary in determining ionospheric layer

profiles, J 64D2, 111. gain and path antenna gain, measurements of correlation, 1401. nightglow 5577, 2817. nightglow by the van Rhijn method, 1534.

pulse, analyzers, multichannel, 2207. Heights, nightglow: a reinterpretation of old data, 1416. Heisenberg and Obukoff theories of turbulence, 1215.

Helical, potentiometers, 1070.

springs, long, under fluctuating load, behavior,

1530. springs of finite thickness, 1427. tungsten, spring balance, 162. Helium, at low temperatures and high pressures, TN8,

(PB151367). Joule-Thomson process in the liquefaction of, RP2834.

large scale, helium liquefaction and transportation, 2797.

liquefaction and transportation, 2855A.

liquefier, National Bureau of Standards, increased

rate of liquefaction, 2157.

liquid, attenuation, 1137.

liquid, bath and reproducibility of resistance ther- mometers, constant temperatures, 2916.

liquid, below 1° K, normal fluid concentration in, 774.

liquid, cryostat with an integral super-conducting

resonator, 26 10A.

liquid, lambda transition, 2475.

II, liquid, rayleigh disk, 157.

II, liquid, second sound propagation in, 821.

(

4 He I), neutral, energy levels and spectrum of, J 64A1, 19. nonventing, liquid dewar, temperature stratification, J 64C1, 19.

4, photodisintegration, 1106.

rarefied, propagation of sound, 115. refrigeration and liquefaction using a liquid hydrogen

refrigerator for precooling, TN39 (PB151398).

vapor-pressure scale of temperature, 1535. vapor-pressure scale of temperatures, 2818. wave equation with the SEAC, numerical solution, 372. Hepp-Scatchard osmometer, improved, 1362. Heptane-air, autoignited, mixtures, emission spectra, 442. Hermite orthogonal functions, 283. Hermitian matrices, by the segment method, bounds for eigenvalues, 1005.

indefinite, 2303.

inequalities concerning positive-definite, 1496. Herzberg bands of 0

2 in an oxygen afterglow and in the night sky spectrum, 1185. Heterogeneity, chain block designs with two-way elimination of, 966. Heterogeneous reaction of chlorine and nickel between

1200° and 1700° K, kinetics of high temperature,

2608. Hevea and Castiloa rubbers, 160. rubber, Mooney viscometer cure characteristics, 1409. Hexabromoosmate, ammonium, 1201. n-Hexadecane, viscosity, RP2912.

Hexafluorobenzene, by electron impact, ionization and

dissociation, 2168.

pyrolysis of tribromofluoromethane, 2151.

reactions, 2718. 330
Hide substance determination, effect of sample preparation on precision in, 1000. Hides, chrome-tanned steer, influence of splitting on the

strength, 468. High energy, electron-nuclear scattering, 1591. radiation effects in polymers, mechanism, 2194. High, frequencies observable over long distances, new

kind of radio propagation, 369. input impedance transistor amplifier, 2586. polymers, thermodynamics of crystallization, 2846.

precision automatic frequency comparator and

recorder, 1356. pressure apparatus, compact multianvil wedge type, J 63C1, 59. pressure gas handling equipment for autoclaves in chemical research, 2154.

pressures and low temperatures, thermodynamic

properties of helium, TN8 (PB151367).

temperature alloys, determination of aluminum in precipitation hardening stainless steel, J 64A2, 181. temperature, broad-band stark cell for microwave

spectroscopy, 178. temperatures, precision thermostat, 110. vacuum gimbals, 1731. vacuum seal-off valve, 919. very, frequency propagation by ionospheric scattering-

" survey of experimental results, 1971.

very, frequency propagation measurements in the Rocky Mountain region, 1972. voltage X-ray tube, 224. High-altitude nuclear explosions on radio noise, effects, J 64D1, 37. High-density theorium oxide, some physical properties, 1877. High-dispersion spectra of Mars, 2152. High-energy, radiation, behavior of polymers exposed,

factors influencing the behavior, 1343.

radiations, degradation and range straggling of, 680. X-rays, 1150. High-frequency, antenna, long distance horizontal radiation pattern, 2371. communication circuits, effect of echo on the operation, 2810. communication circuits, multipath distortion, 3073. communication conditions, 2127. C-W field-intensity records with the aid of simultane- ous pulse data, interpretation, 472. impedance standards at the National Bureau of Standards, 2583. induced electroluminescence in zinc sulfide, 1728.

limit, evaluation of bremsstrahlung cross sections, 2551.

limit of bremsstrahlung in the Sauter approximation,

2961.

limit of 500-kev bremsstrahlung, polarization, 2694. magnetic permeability measurements using toroidal

coils, 2584. measuring, induced electroluminescence, crystal mount and technique, 2074. radiowaves, measurements of coastal deviation, J 64D1, 57. scatter sounding experiments at the NBS, 730. standards for the Electronic Calibration Center, NBSBL, 2585. High-gain antennas for VHF scatter propagation, 1729. High-order harmonics for X-band oscillator stabilization, 2153. High-power, pulse generator, 627. pulser aids cathode studies, 1029. square-pulse generator, 463. High-precision frequency and time standards, 18. High-purity 18-10, sigma phase, 542. High-repetition-rate mercury pulser, 2155. High-resolution grating spectrometer, infrared, RP2922.

High-speed, computation of ideal gas thermodynamic

functions. II. The diatomic free radicals of the

isotopic hydrides of oxygen and sulphur, 1357. computations in the kinetics of free-radical degradation. I. Random initiation, 2587.

flip-flops for the millimicrosecond region, 1730. machine computation of ideal gas thermodynamic

functions, 1030. motion pictures in textile research, 66. stroboscope for acceleromctcr calibration, 1031. High-stability, bridge-balancing oscillator, 1358. frequency standards, 1359. High-temperature, liquids, 1032.

strain gages, bonding agents, 2474. High-vacuum temperature gradient furnace, 2588. High-velocity streams of hot gas, 1163. High-voltage supply, series-resonant, 539. Higher-order approximations in ionospheric wave-propagation, 67. Hilbert, matrix, 2229. space to the calculus of variations, applications of the theory of quadratic forms, 195. Hindered rotation in symmetric-asymmetric molecules,

1732. History, of automation, brief look, 1585.

glass, optical, production in the United States, 731. International Commission on Radiological Protection, 2589.

vertical-incidence ionosphere sounding at the National Bureau of Stantards, TN28 (PB151387).

Hoist, novel rocket, 2430. Hollow square, torsion, 2385. Homogeneity of six proposed NBS-GMC zinc-base spectrographic standards, investigation, 1377. Homogeneous, conductor with a wavy interface, calcula- tion of the field, 3067. curved ground, transient fields of vertical dipole, 1967. media, theory of reflection from a wire grid parallel to an interface, 2238. Horizon, tropospheric propagation, 351. Horizontally polarized radio waves, a very-low-frequency antenna for investigating the ionosphere with, J 64D1, 27. Horner's rule, two problems in abstract algebra connected

with, 1101. Hospital, operating rooms, conductive flooring, J 63C2,

125; Mono. 11. Hot gases, temperatures, 1882. How the National Bureau of Standards contributes to building codes, 1733. How to solve a linear programming problem, 1360. How statistics improve physics, chemical, and engineering measurements, 68. Human enamel and dentin, determination of some compressive properties, 2518. Humidity, absolute, note on the climatic variation, 1991. during fabrication of polyester laminates, effects, 435.

lag apparatus, simple, 1487. Hydrated cement, 2639. Hydrates, calcium silicate, 1172. Hydraulic, dam-break wave, 974. research in the United States: 1957: M221.

1958: M224.

1959: M227.

turbine contra-angle handpiece, 732. Hydrazine, and ammonia with oxygen atoms and hydrogen atoms in atomic flames, reactions, 1948. substitute hydrazines, electron impact studies, 2939. Hydrazoic, acid and methyl azide by electron impact, ioni- zation and dissociation, 2604.

acid, mass spectrometric study of the decomposition

of, by the electric discharge, 2623.

acid, mass spectrometric study of the rate of thermal

decomposition, RP2881.

Hydride bath for the electrodeposition of aluminum, 363. Hydrides, diatomic, electronic structure, 2543. Hydrocarbon, flames, C2 radical, 1434.

flames, isotopic tracer study of carbon formation, 2018. polymers, pyrolysis, 116. Hydrocarbons, and hydrogen, polyhedral Humes, 514. aromatic, electron impact studies, 2938. aromatic, filtered from smoky air, mass spectra, RP2876.

569918 0—61 22 331
liquid and solid state at low temperatures, vapor pres- sures of, TN4 (PB151363).

nitrogen, active, 2982. petroleum, 107. saturated, microwave absorption in compressed gases, 1778. some, two-stage autoignition, 354. Hydrochloride, yohimbine, crystallographic data, 2508. Hydrocolloidal, alignate, dental impression material, 986. Hydrodynamic, data for dilute protein solutions, interpretation, 2668.

stability in a domain containing a transition point, asymptotic solution of the differential equation,

656. Hydrodynamics, note on the circle theorem, 1084. Hydrogen, and boiling liquid nitrogen flowing axially through narrow annular passages, heat transfer, 2581. atoms, the addition, to solid olefins at —195°, 2803. atoms with solid olefins at — 195°, reaction, 2828. bonding in solid H2 0 and H2 0-H2 02 mixtures, 2894. carbon, determination of copolymer composition by

combustion analysis, J 64A2, 157. carbon, oxygen, and nitrogen calorimetric combustion

in a bomb of compounds containing, 1645.

clouds, interstellar neutral, radio observations, 1836. cyanide and deuterium cyanide, infrared spectra, 1739. departures of, from L.T.E. in a stellar atmosphere and

the consequent structure of the solar chromosphere, 2927.

dc, discharge, microwave measurements of the properties, 2200.

deuteride, 153. deuterium molecules, 2410.

electrode, 2260.

electrodes, titration of acids with, RP2769.

hydrocarbons, polyhedral flames, 514. hydrogen evolution reactions, 3007. glow, dc, effect of microwave signals, 2098. improved, atom beam furnace, TN47 (PB 151406).

ion, 3012.

isotopes, distillation, 2526.

isotopes, low temperature distillation, 2618; 2691.

isotopes, microbiological fractionation, 2635.

isotopes, separation, by multicomponent distillation, 2751.

large liquid, bubble chamber, 1984.

large scale liquefaction, some aspects, 1491.

lines, stark broadening function for, C603.

liquefaction by a dual pressure process, 2156.

liquefaction cycles, 2590.

liquefier, large CEL-NBS, vapor phase ortho-para

conversion, 2859.

liquefiers, expansion engines for, J 64C1, 25.

liquid, in the large CEL-NBS liquefier, new arrange- ment for ortho-para conversion, 1988.

liquid, no-loss storage, mechanical refrigeration process, 1986.

liquid, ortho-para catalysis in production, RP2840.

liquid, refrigerator for precooling, TN39 (PB151398).

liquid temperature refrigeration system, design and

construction, TN38 (PB151397).

negative ion, photodetachment of, 1105. nitrogen, oxygen, water, and ammonia, electric dis- charge, 2309. normal, liquid, 1173.

sulfide, infrared spectrum, 1040; 1187; 1740.

sulfide, infrared spectrum of, from 2200-2800 cm"1

, 1741. Hydrogen-oxygen reaction at the second explosion limit, 248. thermal, reaction at relatively low temperatures, 345. Hydrogen-deuterium, mixtures, deterium in, spectroscopic

analysis, 551. mixtures, distillation, 2093. Hydrogen-bonded liquids, dielectric constant, RP2905.

Hydrograph, sudden water release, J 63B2, 117. Hydrographs, river flow, J 63B1, 43.

Hydrolysis, mutarotation, and rearrangement reactions of glycosylamines, 2642. Hydroxyapatite, pure, crystals, preparation, 1816.

synthetic, and rat molar enamel, 2528.

structure, refinement, 2724. Hygrometers, electric, C586. Hygroscopic expansion of dental casting investments, mechanism, 1405. Hyperbolic and inverse hyperbolic functions to many

places, radix table for obtaining, 810. Hyperfine structure formulas for LS coupling, 733. Hypergeometric, series, programs for computing, 1118.

series, representation of a certain integral involving

Bessel functions, 2236. Hypotheses, other, and randomness, independence of tests, 2231. Hysteresis effect in multiplier phototube noise, 1361.

I

131

, disintegration, 150.

half-life, 863.

Identification, microdetermination of nickel, 70. solar lines, 864. Identities and inequalities concerning orthogonal poly- nomials and Bessel functions, 249. Identity, for the coefficients of certain modular forms,

1262. relationship for fractional replicates of the 2" series, Ignition, Kel-F and teflon, 2591.

precipitated basic calcium phosphates, pyrophosphate

formation, 1465.

self, new light, 266. IGY instruction manual, Pt. 1: World days and communications, 2962. ionosphere, program in the Arctic, 1936. NBS equatorial region V.H.F. scatter research program,

2209.

oblique-incidence sporadic-E and F-scatter program, TN48 (PB151407).

observations, day to day, 3068. observations of F-layer scatter in the far east, 2963. Illuminance of a lens interposed between the source and

the illuminated surface, 858. Illumination, color rendition of fluorescent sources, 1651. daylight to incandescent filament, object-color changes

from, 492. shutter, device for the study of phototropic dyes, 374. Image constrast suitable for using square waves targets, J 64C1, 57. photographic, during fixation, J 64C1, 65. Image-forming system, outline of characteristics, 1801. Immiscibility, oxide systems, 2320; 2320A. surface tension of some simple borates, 2592. Impact, absorbing capacity of textile yarns, 2363.

bars, method of controlled slack quenching, 2426.

ionization and dissociation of methyl siloxanes by

electron, 747. properties of slack-quenched alloy steels, RP2799.

properties of yarns made from different fibers, 734. strength of some thermosetting plastics at low temperatures, 464.

test for leather based on an alternating punching

force, 2457.

testing of various alloys at low temperatures, 2819.

tests of textile yarns, RP2866. Impedance boundaries, plane and curved, excitation of surface waves, 2553.

characteristics of a uniform current loop having a

spherical core, J 64D3, 295. corner-reflector antenna as a function of the diameter and length of the driven element, J 64D2, 135. microwave standards and methods of measurement,

2722. standards, high-frequency, 2583.

wire grid parallel to a dielectric interface, 2364. Implications of Liapunov's conditions for stability, 1142.

slant-Es, 2304. 332
Importance of the Faraday to elemental constants and

eleetrieitv standard*. 2593. Impregnation of s'ole leather with polymers, 2594. Improved cuvette densitometer for cardiac output deter- mination bv the dye-dilution method, 650. description of hafnium spectra, RP2904.

dimensional stability in laminated map paper, 2595. 8-hydroxyquinoline method for the determination of

" magnesium oxide in port land cement, 2893.

electrical differentiation of retarding potential measurements, 2596. Hepp-Scat chard osmometer, 1362. hydrogen atom beam furnace, TN47 (PBl 51406).

optical test for spherical abberration, 950. photogrid techniques for determination of strain over short gage lengths, 465.

stainless steel needle valve, 1034. Improvement, gain stability of the superheterodyne mixer through the application of negative feed- back, 466. response of 4-tt gamma-ionization chambers, 735. Improvements in flame photometric determination of sodium in portland cement, 736.

liquid scintillators, 2597; 2964.

In' 17 and Sb117 radioactivity, 1124; 1471; 2711.

Inclusion theorum for modular groups, 2016. Incomplete block designs, 948. equilibrium and temperature measurement, 1735. Inconel and stainless steel, 3053. ceramic coated, and type 321 stainless steel, 3092. Increased rate of liquefaction of the National Bureau of Standards helium liquefier, 2157. Incremental delay pulse generator, 191. Indentation pressure of a smooth circular punch, 1363. Independence of tests of randomness and other hypotheses, 2213. Index, diagnostic tests, rating, 71

.

notation, generalization of, for absolute tensors of arbi- trary order, J 64B2, 99. proposed, of current noise for composition resistors, 1241.

radio refractive, synoptic study of the vertical dis- tribution, J 63D2, 249.

refraction, Mono. 3, Vol. I and II. refraction of fused-quartz glass for ultraviolet, visi- ble, and infrared wavelengths, 1035.

refractive, gradient, geographical and height dis- tribution of the, 727. spectrochemical analysis, literature on, 1036; 2965. Indigo and azo-dyes, steric effects, 1897.

Indirect transitions in indium antimonide, 1736. Indium, anhydrous, phosphate and thallic phosphate by

X-ray diffraction, crystal structure, 1667.

w-type, arsenide, oscillatorv galvanomagnetic effects, 2678. resonance for D-D neutrons in water, 2450. Indium antimonide, electrical and optical properties of intermetallic compounds, 1007.

elastic moduli, 1693.

electrical properties, 703.

indirect transitions, 1736.

rc-type, galvanomagnetic effects, 2135.

piezoelectric effect, 2690.

piezoresistance, 2252.

p-type, galvanomagnetic effects, 2136. thermoelectric power, 1559.

Industrial, and office quieting, technical aspects, 324. beta-ray sources, safe design and use of, H66.

social research, information processing in, 741. Industry, and Government, use of common standards,

2144. NBS and its service to, 1939.

textile, technological challenge, 2002.

Inelastic collisions the Moliere theory of multiple scattering, 1037.

scattering of 20-kev electrons in metal vapors, 2158.

Inequalities ^

^(•ontvrnin.i; positive-delimit. Ilennitian elementary, relating to a gamma and incomplete gamma function, 3047.

ultraspherical polynomials and Bessel functions, Inequality, determinantal, 1232; 2657. Kantorovich's, J 64B1, 33. Robertson, H. P., determinantal, 1980. Infiltration^meter, portable, design and performance,

Infinite integral, note, 270. products, coefficients of, 853.

slot on half-planes and ribbons, surface currents

excited by, 1907. Influence coefficients of tapered cantilever beams computed

on SEAC, 467; 738. copper ions on the adherence of vitreous coatings to

stainless steel, 1737. exposure conditions on the accelerated durability

testing of asphalt, 1738. ground on the calibration and use of VHF field- intensity meters, 151; 739. heat treating variables on the martensite transformations in SAE 1050 steel, 1186. impurities on the pyrolysis of polyamides, J 63A3,

269. lower permissible levels on atomic operations in the United States, 2598.

splitting on the strength of chrome-tanned steer

hides, 468.

strain rate and temperature on the creep of cold drawn ingot iron, 73. sun upon the ionosphere, 250. temperature on the adsorption of chrome (Cr2 03) by calf skin squares, 2159. temperature on the adsorption of water vapor by

collagen and leather, 74. variations in rotors, dies, and rate of shear on Mooney

viscosity, 740. Information processing in social and industrial research,

741. systems, automation and future management, 2467.

theory, 250A.

theory aspects of propagation through time-varying

media, 1143; 1364.

Infrared, bands of deuterium sulfide, RP2789.

emission spectra of flames under high resolution, RP2903.

emission spectra of OH, CO, and C02 from 3/i to

5.5ju, 578. emission spectrum of methane at 3.3 microns, RP2803.

emission spectrum of silicon carbide heating elements, RP2810.

energy by glasses, transmittance, 1561. extension of the second spectrum of zirconium, 717.

far, region, transmittance and reflectance of cesium

iodide, 2852.

far, transmittance of materials, J 64C1, 55. flame spectra, 1366. flame spectra, emission of, under high resolution, RP2903.

growth transmission of cesium iodide crystals, 460. high-resolution grating spectrometer, RP2922.

measurements, 1072. measurements, past and present, 1367. measurements with a cesium iodide prism, 742. measurements with a cesium iodide prism molecular

spectroscopy, 1351. measurements with a small grating from 100 to 300

microns, RP2821.

multiplets and the solar spectrum, 743. near, solar radiation measurements bv balloon to an

altitude of 100,000 ft., 2645. new, band system of FeO, 368. normal spectral emissivitv, apparatus for the measure- ment, J 64C2, 99.

333
phase contrast refractometer, 2600. photoconductivity due to neutral impurities in germanium, 1039. radiant energy, 124; 812. raman spectra of trans-difluorodichloroethylene, 2161.

region, far, small grating spectrometer, 1488.

region, filters for, 450. spectrometry with a cesium iodide prism, 744. studies in the 1- to 15-micron region to 30,000 at- mospheres, J 63A1, 55. studies on' oolymorphs of silicon dioxide and germa- nium dioxide, RP2885.

study of condensed gases, low-temperature microcell, 2619. study of condensed gases, temperature microcell, 2800. study of hydrogen bonding in solid H2 0 and H2 0- H2 02 mixtures, 2894. study of some structural changes in natural rubber

during vulcanization, RP2816.

synthesis absorption spectra of some m-polvphenyls,

1951. transmittance of certain silicate glasses, effect of

fluorides, 2933. transmitting glasses, 1177. wavelengths, ultraviolet, and visible, 1035. Infrared absorption, iodine in its pyridine complexes and

in benzene. 2994.

liquid water from 2 to 42 microns, 1038. oxygen discharge products and ozone at 4° K, 2599.

spectra, analysis, 1569. spectra of some aldopyranosides, conformations of the pyranoid sugars, J 64A3, 239. spectra of some cyclic acetals of sugars, RP2960.

spectra of twelve substituted benzene derivatives from 15 to 40 microns, 75. spectra of urea, thiourea, and some thiourea-alkali halide complexes, 2160. spectrum of methane from 2,470 to 3,200 cm"1

, J 64A3,

201. spectrum of n-dimethyl-amino-diborane, 1365. studies in organic phosphorus chemistry, 2494. Infrared spectra, asphalts, J 63A2, 189. crystalline polyphenyls, RP2829.

hydrogen cyanide and deuterium cyanide, 1739. molecules of the atmosphere, 2377. structure of ethylene, 2833. sugar acetates in solution, RP2772.

thermally degraded poly (vinyl chloride), RP2832.

Infrared spectrum, acetvlene-d,, i934. carbon monoxide, 516; RP2883.

carbonyl sulfide, 2162. hydrogen sulfide, 1040; 1740. hydrogen sulfide from 2200-2800 cm-', 1741. hydrogen sulfide in the 5100 cm-1 region, 1187. nitrous oxide, 1782.

rotational constants of carbon disulfide, 1932. structure of perchlorylfluoride, 1933.

tertiary butyl fluoride, 2820. Infrareds of certain solids condensed to leave discharges in a gaseous state, 2943. Ingot iron, deformation twinning in charpy V-notch spec- imens of, 679.

effect of strain rate and temperature, 73. effect of tensile strain at low temperatures on de- formation twinning in, 695.

Initial and remanent permeability spectra of Yttrium

iron garnet, 2966.

Inlet system of a four-stroke single-cylinder engine, dynamics, 1322. Inner bremsstrahlung from V49

, 1368.

solar corona during June 1959, 3080. Inorganic constitutents in sucrose solutions, determination, 987. Input, high, impedance transistor amplifier, 2586. Input-output, key or bottleneck, 2601. InSb, galvanomagnetic effects, 1352. Instantaneous power spectra, 469.

Institute for Numerical Analysis, 152; 337.

Instructions, operating, for ARN-2 auxiliary log-linear noise recorder, TN45 (PB151404).

Instrument, automatic, for electron scattering measurements, 1274. cables subjected to shock and vibration, electricall noise, 437. measuring marginal power of spectacle lenses, 1369., measuring, piston gage, 877. mechanically differentiating curves, 24. pneumatic, based on critical flow, 14. recording, under dynamic conditions, 2286. Instrumental drift, 1041. Instrumentation, automation, 1370. dental materials, review of 1956 dental research, 2290. documentation, 1682. future of mankind, 1371. meteorological, at the NBS, 1073. perspective, 76. research at the NBS, 1372. revolution in industry, science, and warfare, 1042. where we stand, 2602. Instruments, AC-DC transfer, for current and voltage measurements, 2446.

dental, cutting, 1165. dental materials, 1951-55, 1669. developments, 2519.

electrical, 99. electrical indicating, used in early Edison central

stations, 702.

electrical, testing of, 886. electrothermic, 1012. immersion-type, measurement of gas temperatures,

867. magnetic high frequency measurements, 1043. meters, electrical, 1814. recording, direct-indicating, 690. rotating dental diamond abrasive, 2085. Insulated loop antenna immersed in a conducting medium,

RP2781.

Insulating, concretes, 1742.

materials, comparison, 2416.

materials, electrical, 992.

properties, thermal, of airspaces and fibrous insula- tions bounded bv reflective surfaces, BMS151.

thermal, 1203. Insulation, sound, of wall, floor, and door constructions, BMS144, 2d Suppl.

Insulations, characteristics of some, for liquid oxygen transfer lines, 2054.

Integrabilitv of strain rate and strain, conditions of, RP2813.

Integral,j\-»3 du, table, 320. boundary points of convex polyhedra, 1743.

circulants, unimodular, 1567.

differential equations, 278.

differential geometry, metric methods in, 764. equation approach to the problem of wave propagation over an irregular surface, 394. equations, 2500. equations, symmetric, error bounds for the eigenvalues, 1707.

infinite, note, 270.

large, curves of a non-linear differential equation,

behavior, 2662. transformations, relations between, and summation

methods, J 63B1, 1. Integrals, airy functions, AMS52.

function space, 185. multiple, some Monte Carlo experiments in computing, 1875.

practical evaluation, 1098.

tables of transport: a supplement, J 63B1, 23. Integrating and differentiating bar-magnetic velocity meter

for use in ballistocardiography, 951. Integration, concepts in the terminology of measurement

and control, 1935. parabolic equations by difference methods, 497. 334
[ntensities, absolute, of [01] 5577 in the auroral and subauroral zones, comparison, J 63D1, 19. Intensity distributions in nitrogen bands excited in auroras and bv high-energv protons and hydrogen atoms,

its 1044.

'

Interacting electron beams with application to solar radio

noise, 1418. Interaction of stretching vibrations and inversion in ammonia, 1744. Intercomparing neutron source strengths by means of a manganous sulfate bath, scintillation counter method, RP2952.

Intercomparison, French and U.S. roentgen ray standards,

2017. roentgen standards of Great Britain and USA, 1621. Interconnection of two digital computers, 1536.

Interdisciplinary approach to science personnel, 77. Interfacial waves in viseoelastic media, 1745.

Interference, antioxidant in the determination of low poly- mer in SBR synthetic rubber, 2967.

orbital and spin currents on bremsstrahlung and photag toelectric effect, 2968. patterns in reverberant sound fields, 1373. wide-band FM adapter reduces, 169. Interferometer, electron, 438; 706; 947.

large surfaces, RP2943.

low pressure gases, 648.

tra microwave Fabrv-Perot, reflectors for, 3034.

parallel testing, RP2917.

stroboscopic, for vibration measurement, 2784. Interferometry, electron, 707.

res, Fabry-Perot, phase shift effects, J 64A3, 191. microwave, J 64B1, 1. Interlaboratory comparison of thermal conductivity de- terminations with guarded hot plates, 251. Intermediate and high energy scattering, application of variation methods, 955.

1 Intermetallic compounds, electrical and optical properties, 1330.

optical and electrical properties of, 1007. photoconductivity and photovoltaic, 1806.

J photoeffects, 1444. semiconducting, 823. Intermittent-action camera with absolute time calibration, J 64C2, 159. Intermittent communications with a fluctuating signal, 2163. Internal barrier in ethane, 2603. energy of highly ionized gases, 3081. gas counting, 2714.

reflection in the troposphere and propagation beyond

the horizon, 470. rotation in methyltrifluoromethyl acetylene, 1374. International relations, National Bureau of Standards and

its, 339. Commission on Radiological Units and Measurements,

2366; 3022. comparisons of radioactivity standards, 1746. co-operation on standardization of textile testing methods, 471. exchange of scientific information, 79. Geophysical Year July 1, 1957-December 31, 1958, radio noise data, TN18 (PB151377).

Geophysical Year, radio and ionospheric observations, J 63D1, 1. Geophysical Year: progress report, 1188. methods for testing colorfastness of textiles, 1375.

plastic committee considers standard tests, 1376. Standards Organization Technical Committee 61 re- port, 1477.

textile work shows fast progress, 2164. Interplanetary space and the earth's outermost atmosphere,

2969.

! Interpolation, coefficients for polar complex, 36.

coefficients, tables of osculatory, AMS56.

problem, 782.

series, linear functional equations, 1050.

Interpretation, chemical data, 579. high-frequency C \\ field-intensity records with the ma. ^j*^^ ° 1 OIK ( nsa t( s f 1 0,11 111 ban atmospheres,

radar waves from meteor I rails, 338.' spectra of atoms and molecules in solid nitrogen con- densed at 4.2° K, 1747.

tests for resistance to abrasion of textiles, 473. Intervals for a proportion, confidence, 1660. Intrinsic viscosity, graphical method for single-point deter- mination, 1235. viscosity-molecular weight relationships for dextran,

745. Introduction, July 1956 issue, Revs. Mod. Phys. containing

all papers of the Intern. Conference "Quantum

Interactions of the Free Electron," 1748. VLF papers, 2165. Introductory remarks on the dosimetry of ionizing radiations, 1045. Invariance of insidedness in projective transformations of the Maxwell triangle, 1046. Inverse feedback, intermediate-frequency gain stabilization, 78. nodal slide, evaluation of lens distortion by, J 63C2,

105. Inversion of matrices by random walks, 282. Investigation, bearing creep of two forged aluminum alloys, TN55 (PB161556). homogeneity of six proposed NBS-GMC zinc-base spectrographic standards, 1377. perturbations impassed upon radio waves penetrating

the ionosphere, 2458.

slot radiators in rectangular metal plates, 1622.

structural failures of welded ships, 746. Investigations of the properties of corrugated diaphragms,

1378; 2166. Invited discussion on the Haringx diaphragm theory, 2167.

Iodide, potassium, fast neutron detector, 1451. sodium, scintillation detector to high energy X-rays,

2741. thallium bromide, refraction and dispersion, 1842. titanium tetra-, heat of formation, J 63A2, 161. trace quantities, polarographic determination, 2258. Iodide-cesium, far infrared region, transmittance and re- flectance, 2852.

optical properties, 1436. prism, infrared measurements, 742. prism, infrared spectrometry, 744. prism molecular spectroscopy, further infrared measurements, 1351. prisms, to 50 microns, 1551.

Iodine, analysis of first spectrum, J 63 Al, 1. vapor barriers, 2892.

Ion, atom interchange in air, 1379.

bisulfate, ionization, 3076. exchange columns, automatic cut-off valve, 1273. hydrogen negative, photodetachment of, 1105; 3012.

negative, appearance potentials, 2481. production during measurements, 193.

Ionic, character and elastic moduli of zinc blend lattices, 2367. charge and alkali-aggregate reaction on hydrated

cement, 2639. cubic crystals, lattice energies, 2175.

detergents, electroviscous effect, in dilute aqueous

solutions, 2667.

dissociation of 2,4-, 2,6-, 3,4-dichlorobenzoic acids

in water, 2368.

dissociation of 2,6-dimethylbenzoic acid in water,

2369. model, noncrystal, for silica glass, RP2782.

non-migratable, charges developed by portland and

high-alumina cements during hydration, source, 2768. recombination including ion production during measurements, 193. 335
Ionium (TH230

), alpha-gamma angular correlation, 643. Ionization, average energy loss, secondary electrons, 538.

bisulfate ion, 3076.

cavity, as a function of wall materials, RP2842.

cavity, theory, 1229; 1247; 1606. chambers for radiation data during dental X-ray

exposure, 1380. chambers, free air, design of, H64.

chambers, standard free-air, plate separation re- quirements, 1110. constants, 3076.

detectors, dose measurement in water using scintil- lation and, 995. dissociation of hexafluorobenzene by electron impact,

2168.

dissociation of hydrazoic acid and methyl azide by

electron impact, 2604.

dissociation of methyl siloxanes by electron impact,

747. dissociation of NF3 by electron impact, 1749.

dissociation of oxygen difluoride by electron impact,

2169.

dissociation of perchlorylfluoride by electron impact,

2170.

efficiency curves of hydrogen and deuterium molecules, 2410. gamma, chambers, improvement in response of 4x, 735.

multiple, of sodium vapor by electron impact, 2996.

potential of the CF3 radical and some fluorocarbon bond energies obtained by electron impact, 580. produced in air by alpha particles near 5-Mev and by beta particles, 2912.

rare gases by electron impact, multiple, J 63A3,

201. shock fronts in collisions of gas clouds, 2496A.

sporadic-E, 2885.

Ionized, gases, 2632; 2988; 3081.

gases, thermal diffusion, 2844.

layers, turbulent, aerodynamical mechanisms pro- ducing electronic density fluctuations, 1254. Ionizing radiation, 1151.

biological purposes, 1189. permissible exposure, 1443. Ionograms, facilities for convenient manual reduction, TN14 (PB151373).

night-time low-frequency, interpretation, 2821.

oblique-incidence, TN31 (PB151390).

Ionosphere, 1537; 2700. auroral zone, 2317. disturbances on low frequency propagation, 229. echoes, low frequency, note on the polarization, 371.

effect of small irregularities on the constitutive rela- tions, J 63D2, 135. electron density fluctuations, 2381. 41 Mc/sec, observation on vertical-incidence scatter, 2655. horizontally polarized radio waves, a very-low-fre- quency antenna for investigating the, J 64D1, 27. IGY program in the Arctic, 1936. influence of the sun, 250. lower, and on VHF forward scatter, 2759.

lower, and the [OI] 5577 nightglow emission, 2880.

lower, extreme useful range of VHF transmission by

scattering, 2560.

lower, radio transmission at VHF by scattering and

other processes, 1469.

lower, radio waves, 2661.

lower, stratification in, J 63D2, 117. measurements over a 1,150 km path, 561. multiple reflections between earth and, in VLF propagation, 1781. observations at 50 kc, 80. quiet, mean electron density variations, TN40-1

(PB151399-1); TN40-2 (PB151399-2).

radio waves penetrating, 2458. recorder for low frequencies, 651. soundings covering frequency range from 50 Kc/s to 25 Mc/s, 2064.

theory of reflection of low- and very-low-radiofre- quency waves, J 64D3, 269.

vertical-incidence, sounding at the National Bureau

of Standards, TN28 (PB151387).

Ionospheric absorption, measurement, 3091.

characteristics, use of sweep-frequency backscatter data for determining oblique-incidence, 2838. conditions in the southern auroral zone, 1650.

critical frequencies and sunspot number for different sunspot cycles, 571. data, 1117. detachment rate for O3, experimental photodetach- ment cross section, 2556.

disturbances, continental maps of, 675.

drift measurements in the United States, results, 2288.

effects produced by solar flare radiation, 1750.

fine structure using earth satellites, comparison of phase difference and Doppler shift measurements,

2493. forward scatter, 2171. heights deduced from phase velocity, 2931.

investigations using the sweep-frequency pulse tech- nique at oblique incidence, J 63D2, 151.

irregularities, scattering at oblique incidence, 1482. Ionospheric layer profiles, joint use of the ordinary and

extraordinary virtual height curves in determining, J 64D2, 111.

layers, current nomenclature, 3086.

origin, radio noise, 118. propagation by the scatter-sound method, 2326. propagation, very low frequency, 2203. propagation, V.L.F., for finite ground conductivity, mode theory, 2373. propagation, VLF, mode theory, 2234. propagation, VLF, waveguide mode theory, 2390.

radio, 2490.

reflection coefficients at very low radio frequencies,

calculations, 2044.

reflection coefficients at VLF from sferics measurements, 2172.

scatter communication, 1958 critique of VHF, 2505A.

scatter propagation, 3011.

scattering, modulation studies for VHF, 2639A.

scattering of the VHF radio waves, 1790. scattering-survey of experimental results, very high frequency propagation, 1971. soundings, world-wide, first report of the special committee, 1712. storms, 2884.

vertical soundings, 2173.

vertical soundings for electron density profile data, TN14 (PB151373); TN19 (PB151378).

vertical sounds after the I.G.Y. proposed recommendation, 2704. VHF propagation, regular, 1495. VHF, scatter circuit during the solar event of February 23, 1956, field-strength variations

recorded, 2121. VHF, scattering, frequency dependence, TN9

(PB151368). VLF, propagation, mode theory, 2456. wave-propagation, 67. winds, systematic, 319. world-wide soundings of the URSI/AGI Committee,

second report of the special committee, 2294.

Ions, atmospheric negative, photodetachment, 2245. atoms in the sun, 958

collection of produced by alpha particles in air, 2488. copper, influence, on the adherence of vitreous coatings

to stainless steel, 1737. ions high kinetic energy in mass spectra of polyatomic

molecules, 1144. low energy, in N2 and 02 , 982. molecule, ideal gas thermal functions to 25,000 deg. K for diatomic molecules, oxygen, nitrogen'

nitricocide, 2394.

negative, 2210. 336
negative atomic iodine, nitrogen and argon, G05. negative, diatomic molecular, 2841. negative oxygen, in the upper atmosphere, 1413. negative, photodetaehment studies, 2246.

Irm gamma rays in concrete, steel, and lead, broad and

narrow bean attenuation, 2480. fridium-osmium alloys, 1152. Iron catalyst for production of liquid para-hydrogen,

enameling, during firing, 1153.

ingot, deformation twinning in charpy V-notch specimens of, 679.

ingot, effect of strain rate and temperature, 73. ingot, effect of tensile strain at low temperatuies on

deformation twinning in, 695.

metallic, high purity, preparation, 801.

plastically deformed, residual lattice strains in sectioned

bars, 1479.

tin, copper, silicon, and nickel, electrorefining studies, 2811. Iron-base allovs, NBS spectrograph^ standard samples,

2719." Iron-carbon-nickel alloys, austenite, note on thermal

stabilization, 777.

Iron, cast, nodular graphite in, experimental production,

444.

Irreducible tensorial sets, 2970.

Irregularities, small effect of, on the constitutive relations

for the ionosphere, J 63D2, 135. tropospheric, radio-wave scattering, J 63D2, 205. ISCC—NBS color-name blocks, central notations for the

revised, RP2911.

Isobutvane, tertiary butvl fluoride and trimethlphospine,

2638.

Isolation of the diffusion layer at an electrode and the determination of concentration polarization, 2605. Isomeric polyphenyls by adsorption chromatography,

separation, 2752. Isomers, Cd115

, decay of, 569. Isomorphous substitution in enamel apatite, 748. Isoperimetric inequality, closed curves convex in even- dimensional euclidean spaces, 952. polygons, algebraic proof, 1259. Isotope "analysis using dimethylmercury, 1381.

dilution techniques, structural analysis of clinical dextrans by periodate oxidation, 2319.

effect in oxidation of D-mannitol-2-C 14 by acetabacter suboxydans, 2606.

effect in superconductivity, 581.

effect in the superconductivity or mercury, 81. hydrogen, distillation, 2526. hydrogen, low temperature distillation, 2618; 2691. hydrogen, microbiological fractionation, 2635. hydrogen, separation, by multicomponent distillation, 2751.

radioactive, lower permissible levels, 2099.

radioactive, safe handling of bodies containing, H65.

stable carbon, analysis of optical spectroscopy, 1892. three rare-earth, alignment, 1256.

tin, superconductivity, 560. Isotopic abundance of solids, 180. abundance ratios reported for reference samples

stocked by the National Bureau of Standards, TN51 (PB161552). abundance, reference samples, 1475. hydrides of oxygen and sulphur, diatomic free radicals, 1357.

tracer study of carbon formation in hydrocarbon

flames, 2018.

Isotropic length of polymer networks, 2370. paramagnetic crystal, 981. source, plane, angular distribution of multiple-scat- tered gamma radiation, 1265. sources through aluminum and concrete, gamma rays, TN11 (PB 15 1370).

Iteration, cyclic single step, 781.

Iterations with superlinear convergence, method of speedIterative method for finding characteristic vectors of a symmetric matrix, 192. processes, accelerating convergence, 2447.

Jacobi, polynomials and Whittaker functions, certain series expansions involving, 1424. polynomials, generating functions, 1426. Jerkmeter for ballistocardiography, 1752. Jet abrasive method for measuring abrasion resistance of organic coatings, 1249. engine controls, simulator for use in development,

C584.

engine test cells, measurements on sound absorbers,

1771.

Jets, subsonic air, reverberation chamber study of the sound power output, 2742.

Joint use of the ordinary and extraordinary virtual height curves in determining ionospheric layer profiles, J 64D2, 111.

Joints, flush riveted, fatigue and static tests, 1345. riveted and spot-welded lap, of aircraft materials, creep and creep rupture characteristics, 1299. Joule-Thomson process in the liquefaction of helium, RP2834.

Junction transactor circuit applications, 749. K

Kantorovich's inequality, J 64B1, 33. Kaolinite, halloysite, and a related mineral in clays and

soils, criteria for the characterization, 420. Kel-F and teflon, ignition, 2591. Kinetic data to rate equation, function to the aid in the

fitting, 1983. spectroscopy in the far ultraviolet: the flash photolysis

of ethyl compounds, 2607.

Kinetics, capillary shear degradation in concentrated poly- mer solutions, 1723. chain depolymerization, 474. chemical, stochastic processes, 2898. chemical, the application of the theory of stochastic

processes, 2805.

crystallization in polymers. I. Bulk Polymers, 1047.

crystallization in polymers. II. Polymer-diluent

mixtures, 1382. D atom reactions with H2 , 2971. depolymerization, some aspects, 307. elementary gas phase reactions at high temperatures,

1433.

free-radical degradation, high-speed computations,

2587. high temperature heterogeneous reaction of chlorine and nickel between 1200 and 1700° K, 2608. nitrogen atom recombination, 2972. OH radicals, acetylene-oxygen flame, 476. OH radicals from flame emission spectra, 475. ortho and parahydrogen, 2953. polymeric systems, crystallization, 2507; 2923. reaction between nickel and chlorine above 1,100° K,

2174. Kinorama as an evaluator in aviation lighting, 582. Kjcldhal method, determination of nitrogen in leather, 332. Kleine Bermerkung zur asymptotischen Entwicklung des

fehlerintegrals, 1383. Konig, theorem of, 1719. Kosters double-image prism, 2822. L La recherche sur les radicaux libres au National Bureau of Standards, 2973. Laboratory aging tests for plastics, fluorescent sunlamps,

1713. automation, 2468.

337
field exposure studies of leather fungicides, 1754. government, engineering management in, 712. standard microphones, 1048.

tests with turboprop lubricants, 2610. Lactones, aldonic, sodium borohydride reduction, 1868. Ladders, portable metal, new safety code, 2374. Laguerre orthogonal functions, relative extrema, 105. Lambda transition in liquid helium, 2475. La medida de la luz y el color, 2609. Laminar flow, heat transfer, 2579. through a tube, heat transfer, RP2937.

through a tube, solution of the differential equation

occurring in the problem of heat convection in, 789. Laminated map paper, improved dimensional stability, 2595. Laminates, metal-clad, characteristics, 2053. Lamination, preservation of documents, Mono. 5. Lamp, two secondary tungsten filament, standards, 2716. Lamps, fluorescent, 134. metal-halide, electrodeless, 705. Lanthana-alumina, system, 2472. Laplace's equation, numerical methods associated with,

274. Large liquid hydrogen bubble chamber, 1984. reduction of VHF transmission loss and fading by

the presence of a mountain obstacle in beyondline-of-sight paths, 1384. reductions of VHF transmission loss and fading by

the presence of a mountain obstacle in beyondline-of-sight paths, 750.

surfaces, testing of by interferometer, RP2943.

Latent roots, Fox's escalator formulae, 386. positive matrix, 405. Latin squares, a note on the four by four, 5. partially replicated, 1442. Lattice energies of ionic cubic crystals, 2175. regular rhombohedral, sampling, of Munsell renotation space, 930.

residual, strains in sectioned bars of plastically de- formed iron, 1479.

Lattices, zinc blend, ionic character and elastic moduli,

2367. Layered earth propagation in the vicinitv of Point Barrow, Alaska, J 64D1, 95. Layers, compressible turbulent boundary, with heat

transfer and pressure gradient in flow direction J 63B1, 53. Lead, aluminum, and concrete in the range 275 to 525

kilovolts, X-rav attenuation, 1582. bismuth at 7 Mev, 3014.

concrete, and steel, broad and narrow beam attenuation of Ir 192 gamma rays, 2480.

concrete, attenuation of 86- and 176-Mev synchrotron X-rays, 1635A. gamma-ray flux, 2917. heat content, from 0° to 900°, and the heat of fusion, 1027. niobate PbNb2 06 , unit-cell data, 2401. oxide-niobium pentoxide, phase equilibrium relations

in the binary system, RP2925.

resistance errors in watthour-meter tests, 1049. storage batteries—essential to modern transportation, 751. X-rays scattered in, energy and angular distribution, 2111. Lead-acid storage batteries, 1141. Least pth power polynomials on a real finite point set, 1385. Leather, Castiloa and Hevea rubbers, treatment, 160. chrome-tanned, 558.

collagen, and other organic and fibrous materials, heat of wetting, 1028.

collagen, influence of temperature on the adsorption

of water vapor, 74. collagen, physical and physico-chemical constants,

510.

collagen, pores, 1449.

collagen, specific heats, 1502.

compounds applied to, fungicidal effectiveness, 2131.

cyclic strain testing machine, 1304.

flex tension test for, 917.

fungicides, deterioration, on, 2353.

fungicides, laboratory and field exposure studies 1754.

fungicides, studies, 2788. grease in, 219. heavy, note on the indentation of, 776. heavy, with polyisobutylene and other polymers,

pilot plant study of the process for treating' 1240. impact test for, based on an alternating punching

force, 2457. impregnated, method for restoring original appearance, 1407. Kjeldhal method, determination of nitrogen, 332. polyisobutylene, treatment, 607. power factor, resistivity, dielectric constant, 533. prevention of microbiological deterioration, 1817. sampling of, 3039.

side upper, sampling, 535.

sole, with polymers, impregnation, 2594.

studies on, by means of a sonic technique, 1905. upper, significance of the results of some physical tests, 1485. water vapor permeability, 57. Leathers, chrome-tanned, properties of split and unsplit,

601. military upper, 842. Legendre, Gegenbauer functions, general, addition theo- rems, 1253. polynomials, second order determinants, 305. ultraspherical polynomials, recurrent determinants,

298. Legislative control of radiation, 1755. Lemma, Watson's modification, J 63B1, 15. Length, changes, thermal, of refractory castables, RP2768.

response of a loaded electric dipole in an imperfectly conducting cylinder, J 64D3, 289. standard of and atomic beam sources, 2464. standards and light waves, 1387. standards, calibration at NBS, C572.

Lengths, short gage, improved photogrid techniques for determination, 465. Lens, automatic, design methods, 2034.

design: a new approach, J 63B1, 31. distortion by the inverse nodal slide, evaluation of, J 63C2, 105. distortion by the modified goniometric method, evaluation of, J 63C2, 113. distortion, evaluation of, by visual and photographic methods, RP2920.

effect of illuminance, interposed between the source and the illuminated surface, 858. Lenses, corrected ophthalmic, marginal performance of, RP2869.

photographic, spurious resolution, 315. photographic, testing, 1169. sine-wave response, 2999.

spectacle, instrument for measuring the marginal

power, 1369. Leonard Enid 's integral: a historical profile of the gamma

function, 2974. Lercb zeta functions, 1798. Les Tektites—Ces objets de verre tombes du ciel proviennent-ils d'une planete perdue? 1756.

Letter, outgoing, ma.il characteristics, some applications of

statistical sampling methods, TN16 (PB151375).

Lettermail, incoming, at the Baltimore, Maryland City Post Office, distribution, TN33 (PB151392).

Liapunov's conditions for stability, implications, 1142.

Light, coated groundwood papers, effect, 1327.

color, a new point of view in the measurement, 1989.

color, measurement, 2609; 2627. emission from solid nitrogen during and after electron bombardment, 2975.

emission, radio-astronomical test of the ballistic theory,

2878. 338
molecular constants of carbon monoxide, velocisty, 1574. new, on self-ignition, 266.

polarized, optical rotation, by chemical compounds,

285. scattering and miscelle structure in the system sodium

dodecyl sulfate-sodium chloride-water, 1386. scattering by commercial sugar solutions, J 63 A3, 205. scattering measurements of a fractionated non-ionic

detergent, 2176.

sources, A, B, and C, spectral energy distribution, 834.

vertical distribution of, from gas-filled candlepower

standards, 2860. waves and length standards, 1387.

Lighting, aircraft, NBS research, develop ment and testing, aviation, kinorama as an evaluator, 582.

signal, 2562; 2952. Lightning discharges, VLF radiation spectra of, J 63D2,

199. some properties of, impulses which produce whistlers, 2764.

tree from the viewpoint, 1248.

Lights, condenser-discharge, photometer for measurement

of the effective intensity, 2685.

flashing, effective intensity, 2066; 2101. Lignolsulfonates in vegetable extract blends, cinchonine method for determination, 1979. Lime-alumina-water, a study of the system at 1° C, RP2877.

Limit of spatial resolution of refractometer cavities, J 64D1, 65. Limitations, photographic dosimetry of X- and gammarays, 2611. rapid signal analysis, 1388. Limiting polarization of magneto-ionic waves, 583. resolution of electron spectrometers, 2612. thickness of an electrolyzed gas film capable of sus- taining a given negative pressure, 865. Limits of the power resolution of corpuscular spectrometers, 2791. Lindeck potentiometer, 1389.

Line, shape and f value in the OH2 2+ — V transition, 2976. standards of length and measuring tapes, calibration

at NBS, Mono. 15. strengths for rotational transitions of asymmetric

rotor molecules, tables, 2796. Linear calibration curves, study of accuracy in chemical

analysis, 2328.

differential equations, 932.

elliptic differential equations by difference equations with positive coefficients, 785.

entire functions of n complex variables, 498.

equalities, on systems, 1794. form, certain, minimum, J 64B1, 49. functional equations and interpolation series, 1050. functional defined on classes of analytic functions, 1093. functions of two variables, subharmonic and harmonic

280.

interpolation, rounding off of difference tables, 504.

iteration procedures for symmetric matrices, 1097.

iteration processes, determinants with predominant

principal diagonals and the absolute convergence,

1671. normed, spaces, 2065. Linear equations, determination of eigenvalues, AMS49.

extension of Gauss' transformation for improving the

condition of systems, 393.

iterative solutions, AMS49.

solvability and consistency, 1869.

solving, 831. Linear inequalities, 1196 ; 1197.

solvability and consistency, 1869. two consequences of the transposition theorem, 353. two existence theorems for systems, 608.

transforn

led, 1350.

iS of, Gibbs phenomenon, 500. transforms or convex functions, 2115.

viscoelastic behavior, proposed nomenclature, 2271

viscoelasticity theory: delta-function anpnixiniafions

956. Linear programming, 1757. bid evaluation, 1051.

large-scale, Chebyshev polynomials in the solution, 411. problems, how to solve, 1360. proceedings of the Second Symposium, 1458.

relative damping criterion for, 633. systems, degree of, zeros of polynomials, 790. systems of distinct representatives, 1910. Lines of the chemical elements in astronomical spectra

1758. Liquefaction, helium, RP2834.

helium refrigeration, using a liquid hydrogen refrig- erator for precooling, TN39 (PB151398).

hydrogen, by a dual pressure process, 2156. hydrogen, cycles, 2590. increased rate, of the National Bureau of Standards

liquefier, 2157.

large scale, of hydrogen, some aspects, 1491. transportation of helium, 2855A.

transportation, technical aspects of large scale liquid helium, 2797. Liquefied gas storage vessels, 3049. Liquefied gases, 3063. long distance transfer, 2177. performance of pumps, 2243.

single-phase transfer, C596.

with sharp-edged orifices, 2983.

Liquefier, helium. National Bureau of Standards increased

rate of liquefaction, 2157. hydrogen, expansion engines for, J 64C1, 25. Liquid and solid state at low temperatures, TN4 (PB151363). drops and rigid steel spheres, pits in metals caused by collision, J 64A1, 61. flow boundaries, chemiluminescence as a tool in the

study, 1646. hydrogen, large, bubble chamber, 1984. immiscibility volume in the system barium oxideboric oxide-silica, 2754.

large scale, helium liquefaction and transportation,

technical aspects, 2797.

level indicator for condensed gases at low temperatures, 1052. metals and liquid salts, specific heats, 2306.

nitrogen, photolysis of oxygen in solution, 3013. nonventing, helium dewar, temperature stratification, J 64C1, 19. normal hydrogen, 1173. oxygen, survey of hazards of handling, 2333. oxygen transfer lines, characteristics of some insulations, 2054. para-hydrogen, iron catalyst, 1751.

viscous, 1077. Liquid helium, 1137. based on the "cell" model, treatment, 1562. below 1° K, normal fluid concentration in, 774. cryostat with an integral super-conducting resonator, 2610A.

range 1.4°-4.2° K, measurements on the saturation vapor pressure, 1403. second sound propagation in, 821. thermal Rayleigh disk measurements, 603. Liquid hydrogen in the large CEL-NBS liquefier, new

arrangement for orthopara conversion, 1988.

no-loss storage, mechanical refrigeration process, 1986.

refrigerator for precooling, TN39 (PB151398). 339
temperature refrigeration system, design and construction, TN38 (PB151397).

Liquid scintillation, counters, carbon-14 beta-ray standard, benzoic acid-7-C14 in toluene, J 64A2, 143. counting, 2614. Liquid scintillators, 2597 ; 2964.

gas-free, temperature effects, 1915. oxygen quenching and wavelength shifters, 1439. quenching of, role of oxygen, 1858. three ways to increase efficiency, 1966. Liquid-flowmeter calibration techniques, 2613. Liquid-helium cold cell for use with an X-ray diffractometer, RP2907.

Liquid-hydrogen production, ortho-para catalysis in, RP2840.

Liquid-in-glass thermometers, calibration, C600.

Liquid-scintillator temperature effects, 1759. Liquids, constant-level device, 415. high-temperature, 1032. pure, and dilute solutions, dielectric dispersion data,

tables, C589.

radioactive, 1649.

simple, quantum mechanical effects on the surface

tension, 2708. sing-around ultrasonic velocimeter, 2301.

solids for, note on the displacement pressure method

for measuring the affinity, 490. Liquidus surface, shape of, as a criterion of stable glass formation, RP2872.

Literature on spectrochemical analysis, index to, 1036.

statistical, selected bibliography, J 64B1, 55; J 64B1,

69. Lithium borohydride, tritium-labeled, preparation and

use of, J 63A2, 177.

fluoride: heat content from 0° to 900°, melting point and heat of fusion, 1053. heat content from 0° to 900°, triple point and heat

of fusion, and thermodynamic properties of the

solid and liquid, 1390. Load failure of beams, floors, and roof constructions during fire tests, proposed criteria for defining, J 63C2, 121. Local standards laboratories, 2977. Locating sources of variability in a process, 253. Location of the auroral absorption zone, 1054. Logarithmic attenuator, 935. ohmmeter, 1619.

slidewire for a self-balancing potentiometer, 179. Logarithmic-normal distribution with known variances, 2030. Logarithms, table of natural, for arguments between

five and ten to sixteen decimal places, AMS53.

Log e

xe

v

, formal power series, 1931. Logical design of a one-microsecond parallel adder

using one-megacycle circuitry, 1937.

design, problems, 1818. Long distance horizontal radiation pattern of a high- frequency antenna, 2371. distance pulse-propagation experiment on 20.1 megacycles, 2423.

transfer of liquefied gases, 2177. Long-range correlation model of the photonuclear effect, 2669. Longitudinal impact tests of long bars with a slingshot machine, 1760. spherical aberration, optical T-bench method of measuring, RP2880.

Looking ahead in mechanics, 752. nucleus, 753. Loop, of a uniform current, having a spherical core, impedance characteristics, J 64D3, 295. Loran communications, Bureau of Standards comments,

2039. Lossy cable attenuator pads, 754. Lototsky method for summation, J 63B1, 1. Low and medium frequency radio propagation, 2615.

electrical conduction in magnesium stannide, 1695. even configurations in the first spectrum of ruthenium (Ru I), part 2, J 63 A3, 225. 340

frequencies, technique for sweep frequency polarization measurements, 938.

glass dewars for optical studies, 2575. high pressures, thermodynamic properties, TN8

(PB151367). impact strength of some thermosetting plastics, 464. notch depth, effects of, on the mechanical behavior of an annealed commercially pure titanium, RP2790.

pressure explosions, ultraviolet spectrophotometry,

1565. properties of materials, 2268.

properties of the Cr+++ ion in the paramagnetic

alums, 522. quartz crystal resonators and oscillators, 2734. radio frequencies, 2044.

rates of equilibration in dialysis experiments with ionic surface-active agents, 2232. reduction of area gage, 7. removal of nitrogen from hydrogen with silica gel, 2730. some mechanical properties of Mylar and Dacron

polyester strands, 2761.

stability of quartz resonators, 2315.

stabilization of free radicals, Mono.12; 2316. strength and fatigue of glass, 2318. temperatures, TN4 (PB151363).

voltage regulator, 364. Low, very, frequency, ionospheric propagation, 2203. frequency, noise, 2003. temperature, an experimental study of the strength and fatigue of glass, 2014. Low- and very low-radiofrequency tables of ground wave

parameters for the spherical earth theory: the

roots of Riccati's differential equation, TN7

(PB151366). Low-angle X-ray diffraction of fibrous polyethylene, 2616. Low-capacitance power supply, 1391. Low-cost microvolt potentiometer, 2178. Low-distortion transistor audio oscillator, 755. Low-energy ions in N2 and 02 , 982. Low-energy limit of the photonuclear pseudodeuteron

effect, 2978. Low-frequency band, some results of sweep-frequency in- vestigation, 1146.

echoes, polarization measurements, 513. ground wave, further studies of the influence of a

ridge, RP2884.

ionosphere echoes, note on the polarization, 371. night-time, ionograms, interpretation, 2821. portable antennas operating over ice and snow covered

terrain, 2220. propagation, ionospheric disturbances, 229. propagation paths in arctic areas, J 63D1, 99. radiation from a horizontal antenna over a spherical

earth, 1761. standard transmissions, 2179.

very, standard frequency broadcast, 2270. wing of the NH3 inversion spectrum, absorption, 639. Low-latitude aurora, a monochromatic, J 63D3, 297. Low-pass duplexing system for high-frequency pulse transmitters, 1056. Low-temperature distillation of hydrogen isotopes, 2618;

2691. frequency standard, 1589. microcell for infrared study of condensed gases, 2619.

physics, 1055; 2180.

properties of plastic foams, 2620.

scales from 90° to 5° K, 1392. thermal conductivity of free-machining copper, 1393. thermal conductivity of some commercial coppers, 2181. thermometry, resistance-temperature relation, 9. X-ray studies on Rice's blue material, 2979. Lower and upper bounds for the center of flexure, J 64B2,

105. LR-transformation, solution of eigenvalue problem with, AMS49.
LS coupling, hyperfine structure formulas for, 733. L.T.E., departures of hydrogen from, 2927. Lubricants tests. special 311. turboprop, laboratory tests, 2610. Lubrication of plain journal bearings, 82. oil-soaked felt-paci, of ball bearings at high speed and

high temperature, 1422. Luminescence de L'azote solide (4, 2°K) contenant des

atonies on radicaux fibres, 21S2. Luminescence of solid nitrogen (4.2°K) containing atoms

or free radicals, 2182. containing atoms of free radicals. Effect of traces of oxygen, hydrogen and water vapor. 2622.

solids at low temperatures, 2934. Luminous reaction between carbon monoxide and atomic

nitrogen, 2183. reaction between carbon monoxide and atomic oxygen,

866. Luminous-transmittance requirements for railroad-signal glassware in terms of standard source A of the

International Commission on Illumination, an

evaluation of, RP2849. Lunar and solar atmospheric tides in barometric pressure,

1586.

stratification of the F2 layer at Hyancayo, Peru, 83. Lyanpunov's second method, survey, 2439. Lysine deficiency, calcification, 2040. M

Machine attacks on problems whose variables are permutations, 1762. automatic counting, 398.

cyclic strain testing, for leather, 1304. Machines, computing, 233. retrieving and correlating recorded information, 1763. Macromolecular chemistry, 1394. Macromolecules, fibrous, reversible contractile processes, 2743.

flexible, 1174. Macro-molecules to solid surfaces, sorption, 1500. Magnesium, alloy specimens, effect of an anodic (HAE)

coating on the fatigue strength, 1325.

alloy specimens, fatigue strength, 1531.

alloys and magnesium, 2108. base alloys from alkaline chromate solutions, elec- trolytic, 1332. calcium precipitations, removal of Manganese prior

to, 814. oxide-germanium dioxide, 3094.

oxide, high-grade, drain casting of, 996. oxide in cement, 925. oxide in portland cement, 2893. stannide at low temperatures, electrical conduction,

1695. Magnesium-strontium titanates, note on the dielectric properties, 2221. Magnetic, attenuator, ultra-high frequency, 663; 902. Compton electrons, gamma-ray measurements, 725. cooling, 1395; 2981.

cooling and thermometry below 1° K, new materials,

1783.

dipole, arc-lengths along the lines of force, 1633. drum directory and programming system for codesorting letter mail, TN50 (PB151409). drum memory for the NBS Western automatic computer (SWAC), design features, 424.

electrostatic fields, 56. equator, 50 Mc oblique transmission experiment, 2626.

extractor, pulsed, 929.

field control, nuclear-resonance, 491.

field, earth's, on m.u.f. calculations, 3075.

field from electromagnetic sources immersed in a semiinfinite conducting medium, basic experimental

studies, J 64D1, 21.

field, transverse, on the mode theory of very-low-fre- quency propagation, J 64D3, 265.

fields, note on the focusing of electron beams, 95.

high-frequency measurements, instruments for, 1043. high-frequency, permeability measurements using to- roidal coils, 2584.

interaction, electrons with, double scattering, 1320. interaction of H3 , 3082.

losses at low temperatures, 2980. maps of the sun, study, 1600. measurements, amplifier feedback, 2421. measurements, core losses in ferromagnetic materials

at high flux densities, RP2865.

measurements, stability of austenitic stainless steels at low temperatures, 3093.

nuclear, resonance and infrared absorption studies in organic phosphorus chemistry, 2494.

nuclear, resonance of aligned radioactive nuclei, 778. nuclear, resonance in semiconductors, 3000.

properties below 1° K, 756. properties of polycrystalline materials, 2980A.

properties of uranyl-like ions, 2355. specimen mount for fractography, 2424.

susceptibilities of some U(IV) compounds, 1396.

susceptibility of manganese solenide, 254.

susceptibility of systems with /

2 electron configuration, effect of crystal field and spin-orbit coupling, RP2893.

tape recorders, FM data reduction from, 722. thermal properties of chromic methylamine alum

below 1° K, 1057. threshold field curve of superconductor, 584. Magnetized sphere, 575. Magnetoelastic properties of ferrites, TN49 (PB151408).

Magneto-ionic waves, limiting polarization, 583. Magnetohydrodynamic shock wave in a plasma of infinite conductivity, structure, 1902. Magnets, Cunife wires, RP2808.

Magnetometer, electron beam, J 63C1, 69. Magnification, variation in distortion, 1572. Magnitoye okhlazhdenye, 2981. Magnitude and direction of direct currents, commutator

for periodically changing, 1652. Mail, distribution of, by destination at the San Francisco, Los Angeles, and Baltimore post offices, TN27

(PB151386).

letter, magnetic drum directory and programming

system for codesorting, TN50 (PB151409).

sorting, by conventional methods, TN54 (PB161555).

sorting device, capacity requirement, RP2948; J 63B2,

79. sorting equipment, analytic comparison of suggested

configurations, J 63B2, 83. to given destinations, statistical chain-ratio method

for estimating relative volumes, J 64Cl, 37. Maintenance and preparation of standards of radioactivity, 1944.

electronic equipment, TN41 (PB151400).

preparation, and application of standards of radioactivity, C594. Making one measurement do the work of two, 757. Malic acid, dissociation constant, RP2947.

Maltose-l-C u , maltobionodeltalactone-l-C u , and lithium maltobionate-l-C 14 from 3-(a-D-glucopyianosyl)-

D-arabinose, synthesis, 1909. Man-machine systems, analog-digital simulation for the

design and improvement, 2453. Managanese-52, polarized, beta-gamma correlation, 2473. Management, control, electronic computers aiding, 441.

future, information systems, automation, 2467. Manganese, flame photometric determination, in cement,

1930. removal of, prior to calcium and magnesium percipitations, 814.

solenide, magnetic susceptibility, 254. thermal neutron activation cross section, 1397. Manganous, chloride tetrahydrate at very low temperatures, spin-spin absorption in chronic methyl- ammonium alum, 1887. chloride tetrahydrate, spin-spin absorption, 1888. ferrous carbonates, thermal decomposition, 1960. 341
Manila rope, Becker value, by photoelectric reflectometry,

960. D-mannitol-2-C H

, isotope effect in oxidation, by acetabacter suboxydans, 2606. Manometer, 212. U-typi, 211. Manometers and mercury barometers, Mono. 8. Manufacture of paper from glass fibers, 477. Map, laminated paper improved dimensional stability, 2595. papers, experimental, containing synthetic fibers, 2703. Mapping, stroboscopic, of time-variable fields, 140. Maps, magnetic of the sun, study, 1600. world, of /2 critical frequencies and maximum usable frequency factors, TN2, (PB151361). Marginal performance of corrected ophthalmic lenses, RP2869.

Marine, exposure on some aluminum alloys, effect of 20-

year, 1689. radio communications, propagation characteristics of the frequency band 152-162 MC, 1945. Marking methods and recording surfaces, recorder survey, C601. Mars, high-dispersion spectra, 2152. Martensite transformations in SAE 1050 steel, 1186. Masonry, building code requirements for, 945. cracking and damage caused by moisture expansion

of clay tile, 1058. cracking in, caused by expansion of mortar, 419. requirements up to date, 1059. Mass, measurements on the faraday, effect, 573. spectrometric study of the decomposition of hydrazoic acid by the electric discharge, 2623. spectrometric study of the rate of thermal decomposition of hydrazoic acid, RP2881.

spectrometric study of the reactions of some hydrocarbons with active nitrogen, 2982. spectrum of gallium vapor, 738. Mass spectra, aromatic hydrocarbons filtered from smoky

air, RP2876.

condensates from urban atmospheres, interpretation

of, RP2809.

polyatomic molecules, 1144.

pyrolysis: phosphinoborine compounds, J 63 Al, 63. relative sensitivities of some polyphenyls, RP2831. some deuterostyrenes, RP2926.

thermal decomposition, dimethylphosphinoborine

trimer, 994. Mass spectrometer, 194. analysis of fluorinated polyphenyls, 1263. combination crossed-field and time-of-flight, 360. radio frequency, 117. Mass spectrometry, 478; 1060; 1764; 2624. absorption, polymer degradation studies, 515.

analytical, 1626. study of degradation of polystyrene, 557. Mastoid and forehead, mechanical impedance, 1404. Matching loads on a magic tee, 83A.

Material transport during sintering, mechanisms, 1538. Materials, 255.

aircraft sheet, for large strains, Poisson's ratio, 798. bituminous materials for spinning, preparation, 800. construction: their properties and methods of test, 2625.

dense, atomic theory of electromagnetic interactions, 1635.

flooring, 479. low temperatures, properties, 2268.

refractory, permeability and some other properties

of a variety of, 794. research on effects of prestraining and notch sharpness on the notch strength, 1853.

self-ignition temperatures of, from kinetic-reaction data, RP2909.

small, oil-free bearings, 2184. standard, issued by the NBS, C552, 3d ed.

structural, at low temperatures, mechanical properties, Mono. 13. synthetic, in America in 1959, developments, 21. Mathematical foundations and computational methods

for a digital logic machine, 1061. induction, two forms, 2855.

services useful in industry, 759.

statistics and probability, proceedings of the Berkeley symposium, review, 114. theory of probability, elements, 708. Mathematical tables, addendum to a guide to tables on punched cards, 641.

characteristic values of Mathieu's equation for large values of the parameter, 1523. Coulomb wave functions expressed in terms of Bessel- Clifford functions and Bessel functions.

214. Coulomb wave functions in the transition region, 980. evaluation of Coulomb wave functions along the

transition line, 1018. exponential integral for complex arguments, AMS51.

generation of Bessel functions on high speed computers, 2140. generation of Coulomb wave functions by means of recurrence relations, 1532. guide to tables on punched cards, 177; 641.

integrals of airy functions, AMS52.

integrals of Struve functions, 146. natural logarithms for arguments between five and

ten to sixteen decimal places, AMS53.

osculatory inter-polation coefficients, AMS56.

radix table for trigonometric functions and their inverses to high accuracy, 296.

relating to Hankel integrals of order zero, 147. table of the integral,^* du, 320. tablemaking for large arguments, 272. Mathematics for design, 355. determinantal inequality of H. P. Robertson, 1980. note on values of a quadratic form, 2186.

physical, 1445A. Mathieu's differential equation and the spheroidal wave

equation, programming for finding the characteristic values, 518. equation for large values of the parameter, 1523. Matric, plastic phosphor, for fast-neutron detection, 2593. Matrices, AMS49; 2876; 2886. Matrices, bounds of a one-parametric family, 2663. fc-commutative, space of, J 64B1, 51. commutators of, some remarks, 1145. condition of, RP2815; 1175. doubly stochastic, subdeterminants, 2227.

finite commutativity, 2060. group, 1237. Hermitian, indefinite, 2303. Hermitian, inequalities concerning positive-definite, 1496. normal, comparison theorem for eigenvalues, 1231. normal, eigenvalues of sums, 1425. normal, pairs of, with property L, 792. one parametric family, spectrum, 1100.

pairs of, order two which generate free groups, 2242.

pairs of, with property L, 507; 791; 1440. partitioned, applications of a theorem on, J 63B2, 73. permutations of factors in a product of three matrices, generalized commutations of, 1023. quadratic fields, 205; 412. quaternion, 967. random notes on, RP2850. random payoff, games, 2137. random walks, inversion, 282. second-order, tables for diagonalizing, RP2838.

space of, metric inequalities, 1497. symmetric, convergence of Seidel iterants, 329. symmetric, determination of eigenvectors and eigenvalues, 330. symmetric, linear iteration procedures, 1097.

342
theorem on alternatives for pairs, 1246. transformations, commuting bilinear, 1 (15 1. unimodular, of order two which commute, L969. Matrix, classes corresponding to an ideal and its inverse, condition, 149. doubly stochastic, 300S.

eigenvalues of, circular disks containing, note, 2650.

Hilbert, 2229. inversion by a Monte Carlo method, 84. inversion programs, 2814. minimization problem, 1985. new, transformations for obtaining characteristic vectors, 267. normal, spectrum of, variation, 890.

positive, bounds for the greatest latent root, 405.

positive definite, 284. principal submatrices of a full-rowed non-negative, J 63B1, 19. symmetric, 192. theory, basic theorems, AMS57.

Maximum, permissible body burdens and maximum permissible concentrations of radionuclides in air and in water for occupational exposure, H69.

permissible radiation exposures to man, 2187. usable frequencies and lowest usable frequencies for the path Washington to Resolute Bay, 1062. Maxwell triangle, invariance of insidedness in projective transformations of, 1046. Mc, 50, oblique transmission experiment near the magnetic

equator, 2626. Mean absolute value and standard deviation of the phase

of a constant vector plus a Ravleigh-distributed

vector, RP2950.

deviation of the Poisson distribution, 2823.

electron density variations of the quiet ionosphere, TN40-1 (PB151399-1); TN40-2 (PB151499-2). Meaning and standardization of pH measurements, 1767. Measured frequency spectra of very-low-frequency atmospherics, J 64D1, 41.

statistical characteristics and narrow-band teletype message errors on a single-sideband 600-mile- long ultrahigh-frequency tropospheric radio line, J 64D2, 125.

statistical characteristics of VLF atmospheric radio

noise, 2188.

values, reliability. Part I. Fundamental concepts, 594. Measurement, absolute, 780. absolute capacitance, 2647.

absolute, of Wair for polonium-210 alpha particles, 2444.

accurate, of antenna gain, techniques, C598.

aging of rubber vulcanizates, J 63C2, 141. architectural acoustics, standard methods, 2226. atmospheric noise, 2189. burning velocities, 1064. ceramic materials, specular-gloss, 1886.

characteristics, downcoming radio waves, 2932. conductivity of a fluid contained in a cylindrical

vessel, 2233.

control, integration of concepts in the terminology,

1935.

definition of the time constant and response time of thermal converters, 2809. cobalt-60 and cesium-137 gamma rays with a freeair chamber, J 64C2, 87.

color, gloss, and haze, 760.

color, in industry, 2197. continuous, of atmospheric ozone by an automatic

photoelectric method, 977.

control, frequency multipliers and converters, 1349.

correlation coefficients in reverberant sound fields, 1399. creep of acrylic glazing plastics exposed to temperature gradients, 1065. current with the NBS current balance, RP2846.

direct, of absorption line half-widths and intensities

slit function effects, 1867. distortion produced in guarded electrostatic fields by grounded external plates, 1006. dynamic properties of rubber, 480.

effect of irregular terrain on VHF and CJHF directive antenna patterns, 481.

ell'eet of two-dimensional and three-dimensional roughness elements on boundary-layer transition, 1400.

effective intensity of condenser-discharge lights, photometer, 2085. 6 6-1

electromotive force, 141. 50-kev electrons, bremsstrahlung cross-section, 2477. flame speeds by a nozzle burner method. RP2S07.

flow of liquefied gases with sharp-edged orifices, 29X3. gamma-ray dose near the interface between two media

2628. gas temperatures by immersion-type instruments, 867. ground conductivity at VLF, 2670. high temperature in gas streams, 85. infrared, past and present, 1367.

ionizing radiations for biological purposes, 1189. ionospheric adsorption, 3091.

isotopic abundance of solids, 180.

light and color, 1989; 2609; 2627. low energy X-rays, standard, J 64C1, 49. magnetoelastic properties of ferrites, TN49 (PB151408). making one do the work of two, 757. microwave, of variations in atmospheric refractive index, 585. microwave standing-wave ratios, new technique, 1594. neutron flux, and neutron dosimetry, 3055. normal spectral emissivity in the infrared, apparatus

for, J 64C2, 99. photodetachment cross section for H~, 3035.

physical, and medicine, 795.

precise and race for technological supremacy, 2696.

precise, of heat of combustion with a bomb calorimeter, Mono. 7. precise, of the infrared spectra of molecules of the atmosphere, 2377.

precision, 2261. protective coating adhesion, using an electronic aver- aging device for the adherometer, 2273. radiated harmonics, source of error, 377.

radio, of winds aloft, 524. RF power, 2419.

resistance, of ceramic-type strain-gage cements, 2739.

resistance-strain relation and Poisson's ratio for copper

wires, 1768.

service area for television broadcasting, 2190.

sine-wave response of lenses, 2999. standards of, classification and nomenclature, 2486A.

surface roughness of electrodeposited and electropol- ished surfaces by means of the microinterferometer, 86. systems for high-level dosimetry, 2984. systems, power spectra and the minimum detectable

signal, 1430. technological progress, scientific, 537. temperature, and incomplete equilibrium, 1735.

theoretical study of electrical conductivity and Hall

effect in oxide cathodes, 1063.

thickness, C585. treadwear of commercial tires, 761. vibration amplitudes, acoustic method, 946.

vibration, developments, 1492. vibration, stroboscopic interferometer, 2784. voltage ratio at audio frequencies, 2191. Wnir for sulfur-35 beta-rays, 1769; 2008. Measurements, absolute, at the NBS, status, 2781. balloon to an altitude of 100,000 ft., near infrared solar

radiation, 2645. bremsstrahlung polarization, 1643. chromium potassium alum below 1° K, 1067. coastal deviation of high-frequency radio waves, J 64D1, 57. 343
comparative 100 Mc, at distances far beyond the radio

horizon, 972.

correlation, height gain, and path antenna gain at 1046 Mc on spaced antennas far beyond the radio

horizon, 1401.

cross-section for 0.5- and 1.0-Mev electrons, bremsstrahlung differential, 1278. current and voltage, AC-DC transfer instruments,

2446.

dielectric, from 100 to 400 Mc, variable length re- entrant cavity, 638.

dielectric, up to 500° C, 992. Doppler shift, for studying ionospheric fine structure using earth satellites, comparison of phase dif- ference, 2493.

dose, in water using scintillation and ionization detectors, 995. earth satellites, continuous phase difference, 2499.

electrical, 1008; 2935.

electrical, geometric factors, relating to corrosion and

its prevention, 1354.

electrical, standards, 316. electromotive force, 218. electron scattering, automatic instrument, 1274.

factors affecting the accuracy of distortion, made on

the nodal slide optical bench, 2948.

ferrite, gyromagnetic sample, exact solution, 2552.

flow, review of some methods, 1131. fractionated nonionic detergent, light scattering, 2176. gamma-ray, by the magnetic analysis of Compton

electrons, 725.

gloss—past, present, and future, 2143. heat transfer on refrigerated -food trailers, 2580. impedance coaxial slotted-lime, 234. impedance, determination of attenuation, 45. indentation hardness, time-temperature behavior of rubber, 2848.

infrared .with a cesium iodide prism, 742; 1072; 1351. instruments for magnetic high frequency, 1043. ion production, 193. ionospheric drift in the United States, results, 2288. ionosphere over a 1,150 km path, 561. low-frequency echoes, polarization, 513. made at 418 megacycles per second well beyond the

radio horizon, J 64D3, 255. magnetic, feedback amplifier, 2421. magnetic, stability of austenitic stainless steels at low

temperatures, 3093. mass, on the faraday, effect, 573. methods of, recently developed microwave impedance

standards, 2722. microwave attenuation, with accuracies from 0.0001

to 0.06 decibel over a range of 0.01 to 50 decibels, J 64C2, 139. microwave, of the dielectric properties of gases, 259. microwave, of the properties of a dc hydrogen dis- charge, 2200. microwave power, employing electron beam techniques, 2201. microwave power, field of, 2720. mismatch errors in microwave power, 769. near the radio horizon, tropospheric scatter propagation, 1499.

noise, of composition resistors, 1417. oblique-incidence, of the heights at which ionospheric

scattering of the VHF radio waves occurs, 1790. 1-Mev bremsstrahlung, 993.

optical, 2790. over a 2400-KM path, sweep-frequency pulse-transmission, 1520. permeability in the VHF region, cavity techniques,

1283. permeability, using toroidal coils, high-frequency magnetic, 2854. pH, meaning and standarization, 1767. phase of radio waves received over transmission paths with electrical lengths varying as a result of atmospheric turbulence, 1402.

phase of signals received over transmission paths with

electrical lengths as a result of atmospheric tur- bulence, 1770. phase stability over a low-level tropospheric path, J 63D1, 45. physics, chemical, and engineering, how statistics improve, 68.

pile oscillator, of eta, 3015. plane and circular polarized waves in the Great Lakes area, VHF tropospheric recording, 620. propagation, made at 418 Mc well beyond the radio

horizon, analysis of, TN6 (PB151365).

pulse-height, of recoils from B10 (n, a) Li7

, 1123. radiation protection, brief history of the National Committee, 2478.

radio, 263.

reflectance, with the Beckman quartz spectrophotometer, minimizing anomalies, 484.

refractive index, quantitative determination of natural rubber, 292. report on comparative 100 Mc, for three transmitting antenna heights, 1848. retarding potential, electrical differentiation, 2596. rod samples, cavity resonator dielectric, 2907. saturation vapor pressure of liquid helium in the range 1.4°-4.2° K, 1403.

sets of three, 825.

sferics, ionsopheric reflection coefficients at VLF,

2172.

small-current, automatic timer, 2036. sound absorbers for jet-engine test cells, 1771. standards for electronics, 2776. standards for steep front surge, sphere-gap volt-time

curves, 2314. standards of frequencies and time intervals in the U.S.A. from 1954 to 1957, 2550.

surface tension, with a strain-gauge-type testing machine, 2794. temperature, in flames and hot gases, experimental

1340. temperature, in high-velocity streams of hot gas, 116

temperature, in the Mooney viscometer, 1164. thermal Rayleigh disk, in He3 -He4 mixtures, 895. thermal Rayleigh disk, in liquid helium II, 603. thin-target bremsstrahlung, 1676. uncertainty, 1953.

units, radiological, International Commission, 2366

3022.

velocity, below 1° K, 822. very high frequency propagation, in the Rocky

Mountain region, 1972. viscometric and turbidimetric, on a dilute aqueous

solution of a nonionic detergent, 1225. Measures, vector, relations among certain ranges, 299. Measures and weights, administration in the U. S, 1976

administration, NBS and state, 485. approval scale, 1580.

federal basis for, C593.

officials and manufacturers, genuine cooperation, 458. training program, 182. Measuring abrasion resistance of organic coatings, 1249

affinity of liquids for solids, 490. attenuation of balanced transmission lines, 376.

circuit for radiometers, 1068.

directivity of directional couplers, method, 2425. energy dissipation, 1083. equipment, development, 686. high frequency induced electroluminescence, crystal mount and technique, 2074. marginal power of spectacle lenses, instrument for 1369. mucosal surface contours of impressions, casts and dentures, method, 1987. power factor of low-loss dielectrics, 256.

stiffness of paper, 762. surface flammability of materials using a radiant energy source, method, 1593. system, basis of, 3066. 344
system for three-centimeter radio waves, single path phase, 2758. systems, a source of error in radio phase, 10. systems, radio phase, 180. tapes, calibration of line standards at NBS, C572.

tensile and tear properties of plastic films, comparison of methods, 1290. thermal emittance at high temperatures, 3049A.

time and frequency in Hawaii, 257. With the electron, 2192. Mechanical, failures of metals in service, 2629. impedance of the forehead and mastoid, 1404. properties of direct filling resins, 1069. properties of high polymers, 2630.

properties of insulating plastic foams at low temperatures, 2985. properties of Mylar and Dacron ployester strands

at low temperatures, 2761.

properties of refractory semi-dry press specimens,

2501.

properties of some engineering materials, 2193.

properties of structural materials at low temperatures, Mono. 13. quadratures, problems in the theory, 1423. quantum, calculation of the probability of an ex- change reaction for constrained linear encounters,

3025. quantum, effects on the surface tension of simple

liquids, 2708.

refrigeration process for the no-loss storage of liquid hydrogen, 1986. resolution of German syntax patterns, proposals,

290. shear degradation, temperature dependence, 1527. stops for use with helical potentiometers, 1070.

testing of solid materials, 482.

tests on specimens from large aluminum-alloy for- gings, 1772. theory of transport processes, statistical, 2778. Mechanically differentiating curves, 24. Mechanics, looking ahead, 752. quantum, by density matrix and operator techniques,

description of states, 2081. quantum, polarization, 936.

statistical, quantum, 2340. Mechanism, alkali-aggregate reactions, 1406. autoignition in benzene-air mixtures, 1773. contraction in the muscle fibre - ATP system, 2986. formation of OH, CH, and HCO in flame spectra, using deuterium as tracer, 868. high energy radiation effects in polymers, 2194. hydroscopic expansion of dental casting investments,

1405.

stress-corrosion cracking in the AZ31B magnesium

alloy, RP2919.

transition at subsonic speeds, 2195. Mechanisms, aerodynamical, producing electronic density

fluctuations in turbulent ionized layers, 1254

control, 2500. material transport during sintering, 1538. polymer formation and decomposition, 2631. Mechanistic aspects of hearing, 2987. Mechanized computation of thermodynamic tables at the National Bureau of Standards: The calculation

of the equilibrium composition and thermody- namic properties of dissociation and ionized gaseous systems, 2632; 2988. production, components, 1291. Media, time-varying, propagation through, information theory aspects, 1364. Median hourly values of the cosine of the solar zenith angle (X) for thirty-five locations, tables of, TN5 (PB151364).

Medicine, and physical measurement, 795. Medida del color en la industria, 2197. Megacycle, eleven, interferometer for low pressure gases, 648.

418 per second well beyond the radio horizon, J 64D3

255.

20.1, 2423. Melamine resin on chemical tests of paper, effect of 227 Melting behavior of polybutadienes, 1938. copolymers, 1774.

crystalline polymers, 3083.

transition of poly methylene, 869. Melting-point and phase-equilibrium determinations, 1775 Membranes, collodion, sorption of dextran to, 832. Men and electrons, 2989. Mercury barometers and manometers, Mono.8. 198, impure, spectra, 60. isotope effect, 81. pulser, high-repetition-rate, 2155.

purification of, and its physical properties, 2275. Mercury-, air-, and flat-type cells, dry cell standards broadened—now includes, 1321. Meson, neutral, decay, angular distribution, 2461. Mesons, neutral, from carbon near threshold, nhotonroduction, 2250. Message error in diversity frequency-shift reception, 1071. Metal, fatigue, effect of oleophobic films, J 64C2, 147.

materials, ceramic, 1266. oxides with o-ethyoxybenzoic acid and other chelating

agents, 2829.

plates, rectangular, investigation of slot radiators 1622.

plates, rectangular, radiation patterns and conductances of slots cut on, 1947.

progress, cleaning and finishing, 1459. vapors, inelastic scattering of 20-kev, 21 58. Metal-clad laminates, characteristics, 2053. Metal-halide lamps, electrodeless, 705. Metal-rock salt pairs, epitaxy, 367.

Metallic, iron of high purity, preparation of, 801. porcelain enameling, radioisotope study, 1941.

surfaces at 76°K, 2110. Metals contained in platiniferous materials, chemical methods for separating and determining, 668. electrodeposited, 511; 2936.

electrodeposition of, from organic solutions, 1696;

1697. energy losses, electron characteristic, 1699.

less common, from nonaqeous media, electrodeposition, 1331.

liquid and liquid salts, specific heats, 2306. mechanical failures in service, 2629.

nickel and its alloys, C592.

pits in, by collision with liquid drops and soft metal

spheres, RP2958.

pits in, caused by collision with liquid drops and rigid

steel spheres, J 64A1, 61. powdered, alloys of gallium with, as possible replace- ments for dental amalgam, 1613.

ultrasonic vibrations in, transmission, 2398. Meteor activity with occurrence of sporadic-E reflections, 2. burst for intermittent radio communication, 2389.

bursts, communication, 2491.

bursts, experimental equipment for communication

utilizing, 2117.

trail, nature of the decay, 501.

trails, radar waves from, interpretation, 338.

trails, wave-frequency dependence of the duration of radar-type echoes, 348.

trains, study of radio reflections from, in research on

the upper atmosphere, 144. Meteor-burst communication, transmission error function, 2674. Meteor-train echoes followed by ground scatter, observations of distance, 1421. Meteoric glass, Tektites, 1912A.

Meter, bar-magnetic velocity, 951.

gloss, comparisons, 1724. match, VHF, 15. Meter plots drift, frequency-deviation, 455. portable infiltration, design and performance, 2082. timing the flow of very small volumes of a gas, 365.

345
Meterological effects on radio propagation at 96.3 Mc be- tween Richmond, Va., and Washington, D.C.,

study, 635.

effects on scattered radio waves, 1874. instrumentation at the NBS, 1073. observations in radio wave propagation, 2331. theory of wavelength dependence in ultra-high fre- quency transhorizon propagation, J 64D3, 231. Meters electrical, and instruments, 1814.

field-strength, commercial, calibration, 407. VFH field-intensity meters, 739. water-current, rating, 340. wholesale, testing, 565. Methacrylate, methyl, accelerating effect of aminos on poly- merization, 1608. methyl, sulfinic acid derivatives as accelerators in the polymerization, 1906. polymethyl, 838; 999; 1328. polymethyl, and polystyrene, gamma irradiation, 2138. polymethyl, at various temperatures, stress and strain at onset of crazing, 555; 669. polymethyl, determination of the monomer content,

1673. polymethyl, dilute solution thermodynamic behavior

of flexible chain molecules, 687. polymethyl, fracture phenomena and molecular

weight, 2569. Methane from 2,470 to 3,200 cur1

, infrared absorption spectrum, J 64A3, 201. infrared emission spectrum, at 3.3 microns, RP2S03.

vi band, 2206. Methane-air flames, rotation temperatures of OH, 304. Methanes, deuterated, some vibrational-rotational bands, J 63A2, 145. Method for determination of converging factors, applied

to the asymptotic expansions for the parabolic

cylinder functions, 366. determining rate equation for reactions in which the concentration of the reactant is unknown, 1592. dynamic determination of the elastic, dielectric, and

piezoelectric constants of quartz, Mono.9. measurement of the isotopic abundance of solids, 180. measuring local electron density from an artificial satellite, J 63D3, 325. measuring surface flammability of materials using a radiant energy source, 1593. measuring the directivity of directional couplers, 2425. measuring the mucosal surface contours of impressions, casts, and dentures, 1987. restoring original appearance of impregnated leather, 1407. study of the circulation in the dog using a mechanical

left ventricle, 920. Method of controlled slack quenching of impact bars, 2426. preparing uniform films of bituminous materials, 628. speeding up iterations with superlinear convergence,

2427. Methods, evaluating trends in time series of tropospheric

radio field strength data, 546. experimental physics, 2990. measuring the "Q" of large reactors, 1776. Methods reducing heat leak through support members

in liquefied gas storage vessels, 3049. Methyl, azide and hydrazoic acid by electron impact,

ionization and dissociation, 2604. germane, microwave spectrum, 2992. methacrylate, accelerating effect of aminos on polymerization, 1608. methacrylate, sulfinic acid derivatives as accelerators

in the polymerization, 1906. siloxanes by electron impact, 747. Methylamine, alum, chromic, 1057. microwave spectrum of, 1001. molecule, structure, 2322; 2323.

Methylammonium alum, chromic, as a thermometric

substance, absolute temperature below 1° K.

2009. alum, chromic, spin-spin relaxation at very low temperatures, 1889. chromic, alum and manganous chloride tetrahydrate

at very low temperatures, spin-spin absorption,

1887. Methyltrifluoromethyl acetylene, internal rotation, 1374. Metodi probabilistic per la soluzione numerica di alcuni problemi di analisi, 763. Metric, differential geometry, 87. inequalities in the space of matrices, 1497. methods in integral and differential geometry, 764. Metrology and production, 1777. Mg2-Sn, properties, 1460.

Micelle, critical, concentrations by a bubble pressure method, 787. Microammeter, clamp-on, measures a-c current, 2056. clamp-type alternating-current, 2347. Microbiological deterioration of leather, prevention,

1817. fractionation of the hydrogen isotopes, 2635. Microcalorimeter, a refined X-band microwave, J 63C1,

77. microwave, 1236.

Microcell, infrared study of condensed gases, temperature,

2800. low-temperature, for infrared study of condensed

gases, 2619. Microchemical analysis, multipurpose standard, 2641, Mierodetermmation and identification of nickel, 70. Microinterferometer, measurement of surface roughness

of electrodeposited and electropolished surfaces,

86. Micromethylation of polysaccharides, 2198. Microns, 15 to 40, infrared absorption spectra of twelve

substituted benzene derivatives, 75. 2 to 42, 1038. Microphone, condenser, as a displacement detector cali- brator, 2348.

wireless, uses F-M modulation, 2869. Microphones, condenser, 1114. standard, laboratory, 1048. Micropotentiometers, RF, 806.

calibration of signal generators to 1000 Mc, TN-37

(PB151396).

Microscopic tin filaments, superconductivity, 2329. Microscopy, color phase contrast: requirements and applications, 37. electron, of fibers, 4; 1011 ; 1703.

electron, of soil clays and related materials, 439. Microstructure, dental amalgam, 765. human tooth. A. The dentioenamel junction, 2199. Microvolt, low-cost, potentiometer, 2178. Microvoltages, accurate radio-frequency, 640. Microwave absorption, 1162. nonpolar gas C02 , 1074. compressed gases; saturated hydrocarbons, 1778. compressed oxygen, 1408. spectrum of ND3 , 766. Microwave, antenna, pattern of a flush-mounted, RP2796.

attenuation measurements with accuracies from

0.0001 to 0.06 decibel over a range of 0.01 to 50

decibels, J 64C2, 139. attenuation statistics estimated from rainfall and

water vapor statistics, 88. compact, refractometer for use in small aircraft, 2415. components: precision casting vs. electroforming,

258.

crystal diodes used as rectifiers and harmonic generators, excess noise, 2114. double-sweep method for analysis of time-dependent

cavity characteristics, 2636. Fabry-Perot interferometer, reflectors for, 3034.

frequencies, atmosphere, 240. frequency dividers, 89. harmonic generator, 1662.

346
impedance standards and methods of measurement,

interferometry, J 64B1, 1. measurement of variations in atmospheric refractive index, 585. measurements of the dielectric properties of gases, 259. measurements of the properties of a dc hydrogen

discharge, 2200.

microcaloriineter, 1236. microcalorimeter, a refined X-band, J 63C1, 77. mixers, modulator, 2428. oxygen, absorption as a possible atomic frequency

standard, experimental evaluation, 2555. power measurements employing electron beam techniques, 2201. power measurements mismatch errors in, 769. power measurements, recent developments, 2720. power stabilizer, 90. refractometer, recording, 6; 122. region, dispersion in NH3 , 48. signal source, amplitude stabilization, 2452.

signals incident upon different regions of a dc hydrogen glow, 2098. spectra of deutero-ammonias, 260. spectra of molecules exhibiting internal rotation, 2202; 2637; 2638; 2991. spectroscopy, broad-band coaxial stark cell, 178; 358. spectrum and structure of sulfurylfluoride, 2372. spectrum of benzonitrils, 1075. spectrum of CD3 ND2 , 2322. spectrum of methyl germane, 2992. spectrum of methylamine, 1001. spectrum of perchlorylfluoride, search for. 1863. standing-wave ratios, new technique for measurement,

1594. VHF matching termination, 637. Microwaves, conductivity of plasmas, 2914.

noise comparator, 773. suppressing, by zonal screens, 317. Military field X-ray equipment, 483. Milk containers, paper, 1441. farm, tank testing, 1344; 1711. farm, tanks, gaging and testing, 2134.

Millimeter, wavelength dispersion of water vapor, 767. wavelengths, waveguide components, 2339. Millimicrosecond, coincidence circuits, 1779. pulses using a charge-storage type pulse-height analyzer, 2895.

region, high-speed flipflops, 1730. Mineral, bone, structure, 2383.

fillers, resin bonding of offset papers containing, 303. Minerals, borate, 3057. Miniaturization, electronic, new techniques, 489. Minimax theorems, 768. Minimization, matrix, problem, 1985. Minimizing anomalies in reflectance measurements with

the Beckman quartz spectrophotometer, 484. Minimum of, certain linear form, J 64B1, 49. permanent of a doubly stochastic matrix, 3008. Miscellaneous observations on the alkali-aggregate reaction and the ionic charge on hydrated cement, 2639.

Miscelle structure and light scattering in the system sodium

dodecyl sulfate-sodium chloride-water, 1386. Mismatch errors, cascade-connected variable attenuators,

2993. microwave power measurements, 769. Mixed-path ground-wave propagation: 2. Larger distances, RP2770. Mode, expansion in the low-frequency range for propagation through a curved stratified atmosphere,

J 63D1, 75. theory of VLF ionospheric propagation, 2234. theory of VLF ionospheric propagation for finite ground conductivity, 2373. theory of very-low-frequency propagation in the pres- ence of a transverse magnetic field, J 64D3, 265. V.L.F. ionospheric propagation, 2203.

Model, chromosphere from radio and optical data, 2874. electron^corona with reference to radio observations, epitaxy in metal-rock salt pairs, 367. Models of I lie atmospheric radio refractive index, ;iti(t" Modem, batteries, 220 1. numerical analysis. I. Solution of differential equations by recurrence relations, 97. Modes of vibration of a suspended chain, 1 , "(I Modification, electron microscope for electron optical shadow method, 91. Watson's lemma, J 63B1, 15. Modified, differences, divided, 1092.

locked-oscillator frequency dividers, 261. resonance circuits match impedances, 92. Modular, certain, subgroups, normalizer, 1942. forms and some new congruences for the partition function, 2068. forms, certain, generalizations of identities for the

coefficients, 1720. forms, certain, identity for the coefficients, 1262. forms, coefficients of, further identities and congruences, 2573.

functions, class, 2069. groups, inclusion theorem, 2016.

identities, remarks on, 529. subgroups, structure theorems, 1517. Modulator, diode reactance, 3070. microwave mixers, 2428. Modules, expendable, as bases for disposal-at-failure maintenance, TN41 (PB151400).

Moduli, elastic of glasses at elevated temperatures by a dynamic method, 1692.

elastic of indium antimonide, 1693.

elastic of zinc blend lattices, ionic character, 2367. Modulus, dynamic bulk, apparatus for the direct deter- mination, 1629. variations in preferred, and orientation of elasticity in cold drawn music spring wire, 1573. Young's, of various refractory materials as a function

of temperature, 3114. Moebius function on the lattice of dense subgraphs, J 64B1,

41. Mold growth and the pH of tartrate buffer solutions, 262. Molecular, atomic negative ions in stellar atmospheres,

2463. atomic time standards at the NBS, 2549.

clusters, representation of gas properties in terms of, 815. complexes and their spectra, IX. Infrared absorption by iodine in its pyridine complexes and in benzene,

2994. constants of carbon monoxide, velocity of light, 1574.

crystal structure models, bibliography, Mono. 14. diatomic, negative ions, 2841. dimensions and harmonic frequencies of ammonia and

deuterated ammonia, 2411.

distribution functions for the entropy density in an

infinite system, 2558. spectroscopy, iodide prism, infrared measurements

with a cesium iodide prism, 1351.

still, simple rotating, RP2951.

structure and branching, thermal degration of poly- mers as a function, 1557. structure from spectroscopic data, 2651. weight distribution, 3037. weight in polvmethvl methacrylate, fracture phenomena, 2569. weight on the crazing and tensile properties of poly- methyl methacrylate, 999. Molecule, ions, ideal gas thermal functions to 25,000 deg. K for diatomic molecules, oxygen, nitrogen,

nitricocide, 2394. methvlamine, structure. 2322; 2323. NO, stark effect, 2840. spectrum of the C3 , between 3600 A and 4200 A, 2313.

569918 0—61 23 347
Molecules atmosphere, infrared spectra, 2377.

chain, flexibility, sedimentation equilibrium, 2296. deuterium and hydrogen, 2410. diatomic, 2861.

exhibiting internal rotation, microwave spectra, 2202;

2638; 2991.

flexible chain, dilute solution thermodynamic behavior

of: polymethyl methacrylate, 687.

flexible polymer, crystallization, 1924. microwave spectra of, exhibiting internal rotation, 2637. polymer in solution, rate of thermal diffusion, 1472.

reactant, by chemical reactions, 2671.

solar speGtrum, 2205. symmetric top, nonresonant absorption, 2218; 2648. symmetric-asymmetric, hindered rotation, 1732. Molecules, atoms,* basic physics, 2901. atoms of solid nitrogen, 1104. atoms; spectra in solid nitrogen condensed at 4.2°K,

interpretation, 1747.

rotor, asymmetric, tables of line strength for rotational

transitions, 2796. Moliere theory of multiple scattering, 1037. Molten alkali, borates, viscositv and electrical resistivity

of, 907.

alkali silicates, density, expansivity, and viscositv, 422. alkaline-earth borate glasses with three mole percent

of potassium oxide, 2864. Molybdenum, copper, silver, tantalum, and gold at 662

kev, total photoelectric cross sections, 3101. fused salts, electrolytic preparation, 1333; 2811. oxidation at elevated temperatures, 2705.

oxidation, protection of, 2837. preparation of trichloride and tetrachloride, J 63A2, 185

second, spectrum, description and analysis, RP2856. Moments Of order statistics from the YVcibull distribution, 1428. Monatomic gases trapped at 4°K, 2546. Money-value graduations on a computing scale, 204. Monitoring, radiation, 2710. Monochromatic low-latitude aurora, J 63D3, 207. Monoenergetic positrons and electrons, 1204. Monomer, polymethyl methacrylate, determination, 1673.

residual and some properties of self-curing dental

resins, relationship, 1846. Monopole, antenna, top-loaded, the electric field at the ground plane with special regard to electrically small L- and T-antennas, J 64D2, 139. antenna with symmetrical top loading, earth currents

near, RP2959.

effect of the ground screen on the field radiated, 1688. Monostable multivibrator design, 93. Monoxide, carbon, and atomic nitrogen, luminous reaction, 2183. carbon, in studies of air pollution, 1309. carbon, on tungsten, 2888. carbon, velocity of light from the molecular constants, 1574. carbon, with graphite carbon at 450° C, reaction, 2717.

chlorine, flash photolysis, 2357. Monte Carlo, calculations of 7-ray backscattering and

transmission, 1076. experiments in computing multiple integrals, 1875. method, matrix inversion, 84. method to a problem in gamma-rav diffusion, application, 1618. methods, experiments in the solution of differential equations, 1019. Monthly refractive gradient for the United States and its application to predicting the geographical and

annual trend of VHF transmission loss, 870. Moon, theory of radar scattering, J 64D3, 217. UHF, relay, 396. volcanoes on, 3111. Mooney viscometer, cure characteristics of Hevea rubber,

1409.

die closure, 1082. temperature measurements, 1164.

Morphology of ionospheric storms, 2884. Mortar, expansion in, cracking in masonry, 419. Mortars, cement pastes by the alkali-aggregate reaction, 2699.

certain, effects of weathering on, exposed in brick masonry with and without caps and flashings, 1927. Motion, small particles in skew shape suspended in a vis- cous liquid, 1077. two cylinders in an ideal fluid, RP2889.

Motion, solar atmosphere as deduced from radio measurements, 263. storm-D region, 1078. turbulent, 3104. Motivation for working in numerical analysis, 1410. Movements of airglow cells, 2640.

M/j., low, triodes to series regulator circuits, 1630. Mucosal surface contours of impressions, casts, and dentures, method for measuring, 1987. M.U.F. calculations, effect of the earth's magnetic field, 3075. Multi-anvil wedge type high-pressure apparatus, J 63C1,

59. Multiaxial stretching on crazing and other properties of transparent plastics, 1002. Multichannel pulse height analyzers, 2206. Multicomponent distillation, separation of hydrogen iso- topes, 2751. Multicomputer system, 2692. Multi-factor experiments, 2995. evaluating reliability, 2207.

Multiple, integrals, some Monte Carlo experiments in computing, 1875.

ionization of rare gases by electron impact, J 63A3,

201. ionization of sodium vapor by electron impact, 2996.

reflections between the earth and the ionosphere in VLF propagation, 1781.

scattering, inelastic collisions and the Moliere theory,

1037. scattering of relativistic electrons, 1079. Multiple-purpose orthonormalizing code and its uses, 921. Multiplet table of astrophysical interest, TN36 (PB151395).

Multiplets, infrared, solar spectrum, 743. Multiplication and addition, methods for high-speed, appli- cation of digital computers to, C591, Sect. 1. Multiplier phototube noise, hysteresis effect, 1361.

Multipliers, frequency, and converters for measurements

control, 1349. Multipurpose standard for microchemical analysis, 2641. Multistage autoignition of engine fuels, 1411. Multi-stream charge interaction, radio wave generation,

295. Multivibration, monostable, design, 93. Munsell, renotation space, regular rhombohedral lattice sampling, 930. renotation system, extension, 2559. renotation system to very dark colors extension, 1710. renotations, mechanized conversion of colorimetric data, 2633.

renotations, spcct rophotometric data, 2522. Muscle fibre-ATP system, 2986. Music spring wire, cold drawn, 1573. Music wire, cold drawn, crystallography, 2509. Mutarotation, hydrolysis, and rearrangement reactions of glycosylamines, 2642. Mylar and Dacron polyester strands at low temperatures, some mechanical properties, 2761. N

n-dimethylaminodiborane, 1205. n-dimethyl-amino-diborane, infrared absorption specrum,

1365. n-type, indium arsenide, oscillatory galvanomagnetic

effects, 2678. InSb at 4.2° K, galvanomagnetic effects, 1716, N2 and 02 low energy ions in, 982. Nal (TI) scintillation counters, response function, 1856. 348
Narrow hvperfine absorption lines of C„133 in various

buffer gases, 2643. Narrow-band teletype message errors on a single-sideband 600-mile-long ultrahigh-frequency tropospheric

radio link, measured statistical characteristics, J 64D2, 125.

Vli

- National Bureau of Standards, international relations, 339.

services to industry, 1939.

ltf

- National Committee on Radiation Protection and Measurements, brief history, 2478. National Conference on Weights and Measures:

Fortv-second, 1957, M222.

Forty-third, 1958, M225.

Forty-fourth, 1959, M228.

National physical standards and design of experiment,

2209. Natural aud synthetic rubbers, 94; 264; 487; 772; 1412A.

' review of test methods, 2997. Natural gas, analysis of, 25.

>i Nature, adhesion, 1080. cause and effect of porosity in electrodeposits, 1940.

°' decay of a meteor trail, 501. gradient reflections, 586. Nb91 and Nb92

, disintegration, 1179.

°' NBS, aircraft lighting, research, development and testing, 771. alpha standards, coincidence counting, and radiative electron capture, 2644.

equatorial region V.H.F. scatter research program

for the I.G.Y., 2208. 1000-lb balance, 1539. preferred circuits program, 1412. primary frequency standard, 872. semi-centennial 1901-1951, 486. state weights and measures administration, 485. Near infrared, solar radiation measurements by balloon

to an altitude of 100,000 ft., 2645. spectrum of nitrous oxide, 1782. Nebulae, dense dark, radio observations (al-CM), 1468.

diffuse, bright rims, 2496A; 2479. Necessity for uniformity of test procedures, 587. Need for more knowledge of materials in civil engineering, 2824.

; Needle vacuum, 848. Negative, feedback, improvement in gain stability of the superheterodyne mixer through the application, 466. hydrogen ion, 3012.

ion appearance potentials, 2481.

ion, hydrogen, photodetachment of, 1105. oxygen ions in the upper atmosphere: The affinity and radiative attachment coefficient of atomic

oxygen, 1413. Negative ions, 2210. atmospheric, photodetachment, 2245. atomic and molecular, in stellar atmospheres, 2463. photodetachment studies, 2246. Nehari, estimates, numerical experiments in potential theory, 2654. Neodynium147 and cerium141

, alignment, 1255. Nephelene + albite=2 jadeite, 203. Nerve excitation, automatic computation, 1272. Net heat of combustion, AN-F-58 aircraft fuels, 265. aviation gasoline and its correlation with other

properties, 2646. Neumann series for the product of two Whittaker functions, 630. Neutral meson decay, angular distribution, 2461. Neutron, activation cross section, manganese thermal,

1397. dosimetry and neutron flux measurements, standards, 2777; 3055.

fast, detection, plastic phosphor matrix, 2693.

fast, potassium iodide, detector, 1451.

fast, spectrometer based on the total absorption principle, TN10 (PB151369).

fast, spectrometer, double-pulse total-absorption, TNI (PB151360).

(lux measurement and neutron dosimetry, 3055.

physics, 2500.

radiation up to 30 million electron volts, protection

against, H63.

source strengths, scintillation counter method of intercomparing by means of a manganous sulfate bath, RP2952.

Neutron-insensitive gamma-ray dosimeter, 2211. Neutrons, D-D, in water, age to indium resonance, 2450. degradation des poly meres par les rayons, 681.

fast cosmic-ray, sea-level latitude variation, 343.

fast cosmic-ray, with altitude, variation of intensity, 600.

fast, in water, 1180.

fast, reflection of from water, J 63A2, 101. 14,1-Mev in water, attenuation, 2032. samarium, emission of, 383. New, apparatus at the NBS for absolute capacitance measurement, 2647. arrangement for ortho-para conversion of liquid hy- drogen in the large CEL-NBS liquefier, 1988.

criterion of univalence of transformations in R", 3106.

federal standard on colors, 2212.

frontiers in business management control are being

established by electronic computers, 488. infrared band system of FeO, 368. kind of radio propagation at very high frequencies observable over long distances, 369.

light on self-ignition, 266. materials for magnetic cooling and thermometry

below 1° K, 1783. matrix transformations for obtaining characteristic

vectors, 267. method analyzing extreme-value data, 922. method for determining the value of the Faraday, 3. method of checking the consistency of precedence

matrices, 2876. method of recording the sound transmission loss of walls as a continuous function of frequency, 1414. method of solution for unretarded satellite orbits, J 63B2, 105. paper products in competition with textiles, 1784. point of view in the measurement of light and color, 1989. resolving power test chart, 268. safety code for portable metal ladders, 2374. standard wind load requirements, 2213. standards for science and industry, 2998. technique for the measurement of microwave standing- wave ratios, 1594. techniques for electronic miniaturization, 489. techniques for evaluating natural corundum ores, 1081. techniques for fabrication of airborne electronic equipment, 1415.

tools for research, 269. ultra high strength steel, 2214. Newton's method in complex Banach spaces, 559. NF3 by electron impact, ionization and dissociation, 1749. Nickel, chlorine, above 1,100° K, kinetics of the reaction between, 2174.

chlorine, between 1200 and 1700° K, kinetics of the high temperature heterogeneous reaction, 2608. cold-drawn, creep of, J 63C1, 1. copper, and two nickel-copper alloys, annealed, creep

of, RP2836.

electrodeposited, 511.

identification and microdetermination, 70. plating, electroless, 2327.

tin, iron, copper, and silicon, electrorefining studies, 2811. . . Nickel dip, a radioisotope study of metallic deposits in porcelain enameling, 1941. enameling of sheet steel, 1133. radioisotope study, 1599. Nickel-aluminum alloy coatings for the protection of molybdenum from oxidation, 2837. Nickel-chromium-iron alloys, heat capacity and enthalpy, RP2870.

349
Night afterglow, 3084.

airglow, 2825. Nightglow, 5577, height, 2817.

heights: a reinterpretation of old data, 1416. review of observational results, 1191. van Rhijn method, height, 1534. Night-time low-frequency ionograms, interpretation, 2821. Niobate, lead, P6N62 06 , unit-cell data, 2401. Niobium, pentoxide-lead oxide, phase equilibrium relations

in the binary system, RP2925.

tantalum in titanium-base alloys, determination of, RP2929.

titanium, zirconium, and tantalum in steels, determination of, RP2923.

Nitracocide, diatomic molecules, oxygen, nitrogen, and

their molecule ions, 2394. Nitriding phenomena in titanium and the 6A1-4V titanium

alloy, J 64A1, 119. Nitrogen, active, absorption spectrum of vibrationally excited N2 , 2887.

active, hydrocarbons, 2982. a and /3, 2879. argon, negative atomic iodine ions, 605. atom recombination, kinetics of, 2972. atomic, and carbon monoxide, luminous reaction, 2183. atomic and organic substances, 2544. atoms trapped in solids, 2392. bands excited in auroras and by high-energy protons and hydrogen atoms, intensity distributions, 1044.

boiling liquid and hydrogen flowing axially through narrow annular passages, 2581.

calibration of dead space in gas absorption systems,

2524. carbon, hydrogen, and oxygen, calorimetric combustion in a bomb of compounds containing, 1645. diatomic molecules, oxygen, nitricocide, and their molecule ions, 2394. discharged, 2551A.

emission spectra of, bombarded by high energy protons, 576. energy levels in F18 from alpha-particle reactions, 711. gamma-irradiates solid, electron spin resonance spectra, 2940.

gaseous, thermodynamic properties, 1964. isotope analysis by optical spectroscopy, 2775.

leather by the Kjeldhal method, determination, 332.

liquid, 3013. microwave discharge, thermometric study of the fro- zen products from, 2847. oxygen, and air, rotational relaxation, 3038. oxygen, hydrogen, water, and ammonia, electric dis- charge, 2309. removal, from hvdrogen with silica gel at low temperatures, 2730'.

solid, condensed at 4.2° K from a gas discharge, abundance of free atoms, 1607.

solid, condensed at 4.2° K from a gas discharge, spectra emitted, 1881.

solid, condensed at 4.2° K, interpretation of spectra

of atoms and molecules, 1747.

solid, at 4.2° K, phosphorescence of atoms and molecules, 1104.

solid (4.2° K) containing atoms of free radicals, 2622.

solid (4.2° K), luminescence of, containing atoms or

free radicals, 2182.

solid, gas discharge, 3052.

solid, light emission from, 2975.

sulfur in steel, determination, 426. triatomic, in solids at very low temperatures, 3054. Nitrogen-oxygen mixtures, spectra of after glows and dis- charges, 2307.

Nitrous, acid with collagen, reaction, 1837.

oxide, near infrared spectrum, 1782. NO molecule, stark effect, 2840. Nodal slide, evaluation of lens distortion by the inverse, J 63C2, 105. optical bench, 2948.

Noise, airborne, transmission of, through walls and floors, 2397. atmospheric, measurement, 2189. comparator for microwaves, 773. composition resistors, 1416A.

control requirements in building codes, 2215.

data, radio, TN18-2 (PB151377-2).

investigation at VLF by the NBS, 2216. measurements of composition resistors. I. The

method and equipment. II. Characteristics and

comparison of resistors, 1417.

multiplier phototube, hysteresis effect, 1361.

radio, data for the International Geophysical Year

July 1, 1957-December 31, 1958, TN18

(PB151377).

radio, of ionospheric origin, 118. recorder, ARN-2 auxiliary log-linear, TN45

(PB151404).

solar radio, 1418. Noncrystal ionic model for silica glass, RP2782.

Nonequilibrium rate processes, studies, 2324; 2325; 2786;

2787. systems, transient, specification, 2237. Nonlinear, oscillations, singular perturbation methods,

828. theory of space-charge wave in moving, interacting

electron beams with application to solar radio

noise, 1418.

viscoelastic behavior of rubber in shear, 1419. Non-linear differential equations of the second order with

integrable forcing term, 1429. Non-Maxwellian distribution in a shock front and the anomaly of the chromospheric temperature, 874. Non-self-adjoint boundary value problems in ordinary dif- ferential equations, J 64B2, 83. Nonmetals, creep of crystalline, 2072. Nonresonant absorption of symmetric top molecules: shape

of the nonresonant spectra, 2217; 2648. Normal, distribution, note, 1595.

distribution, property of, 928.

fluid concentration iii liquid helium II below 1° K, 774, Normalizer of certain modular subgroups, 1942. Notation for atomic spectra, 775. Notch depth and low temperatures, effects of, on the mechanical behavior of an annealed commercially pure titanium, RP2790.

Note, accelerating components in particle spectrometers,

2649. adjustment of Mooney viscometer die closure, 1082. bounds for certain determinants, 2218. Bragg-Gray cavity principle for measuring energy

dissipation, 1083.

circle theorem of hydrodynamics, 1084.

circular disks containing the eigenvalues of a matrix, 2650.

climatic variation of absolute humidity, 1991. computation of x

2

, 2877. confidence intervals in regression problems, 2429. determination of molecular structure from spectro- scopic data, 2651.

dielectric properties of magnesium-strontium titanates, 2220. displacement pressure method for measuring the

affinity of liquids for solids, 490. estimation of sodium carbonate in photographic

developers, 1238. focusing of electron beams in certain magnetic fields, 95. four by four Latin squares, 5. group matrices, 1237. indentation of heavy leather, 776.

infinite integral, 270. L.F. portable antennas operating over ice and snow

covered terrain, 2219. measurement of sine-wave response of lenses, 2999. normal distribution, 1595. oxyquinolate determination of magnesium oxide in ce- ment, 925. 350
Vincent's theorem, 96. wave propagation through an inhomogeneous medium,

Notes, care and use of electrical instruments, 99. numerical analysis, 97; 98; 271; 272. post-treatment for HAE coatings, 1786. Nouveaucritere d'univalence des transformations dans un R", 3106. Nova outburst, 3085. Novel rocket hoist, 2430. Nozzle burner method, measurement of flame speeds, RP2867.

Nozzles, two-dimensional, by the method of characteristics, design, 1432. NRL Aleutian radio eclipse expedition, 273.

v 3 band of methane, 2221. Nuclear, absorption and elastic scattering of X-rays,

direct observation, 1312.

elastic scattering of photons, 1086; 1787. electromagnetic radiations, 2500.

explosions, geomagnetic effects of high-altitude, 2959.

high-altitude, explosions on radio noise, J 64D1, 37. magnetic resonance and infrared absorption studies in organic phosphorus chemistry, 2494. magnetic resonance in semiconductors, 3000. magnetic resonance of aligned radioactive nuclei, 778. matter distributions from coherent neutral pion production, 2653. moments of Ac 227

, 1420. moments of technetium-99, 875.

reactors, a survey of ceramics, 12. reactors, ceramic coatings, 1285.

states and the theory of angular correlations, geometrical characterization of, 726. Nuclear-resonance magnetic field control, 491. Nucleation and growth processes, 2834.

Nuclei, deformed, 2772.

point, elastic scattering of electrons and positrons, 1694.

polarized, 2902.

polarized, beta-decay, 2557.

polarized, /3-decay of, further experiments, 2132.

radioactive, aligned, nuclear magnetic resonance of, 778. three odd-A rare-earth, alignment, 1611. Nucleon-nuclei scattering, an optical model, 395. Nucleonics, 1087. Nucleus, looking into, 753. Nuclides, beta-emitting, 1200. Nuclidic masses and atomic weights, 2906. Null detector, pressure-sensitive diaphragm-type, 2698. Number, absolute points of a correlation, 1943.

farthest points, 876. representations of a quadratic form as a sum of four squares, 2375. theory, algebraic, some computational problems,

1873. Numbers, natural, roots of, algebraic equations, 1610. psuedo-random, generation and testing, 1722.

rational, subroutine for computations, 1603. Numerical analysis: accelerating convergence of iterative processes, 2447.

alternative derivations of Fox's esculator formulae

for latent roots, 386. application of the Monte Carlo method to a problem

in gamma-ray diffusion, 1618.

Hi S of variations, 195.

lifferential equations bv difference equate. positive coefficients, 785. asymptotic lower bounds for the frequencies of certain polygonal membranes, 957. asymptotic solution of the differential equation of hydrodynamic stability in a domain containing

a transition point, 656. automatic computation of nerve excitation, 1272. automatic computations with power series, 1638.

basic theorems in matrix theory, AMS57.

Begrundung fur die Beschaftigung mit numerischer

Analysis, 1275. best approximation polynomials of given degree,

1641. bounds for certain determinants, 2218. bounds for the greatest latent root of a positive

. matrix, 405. bounds of a one-parametric family of matrices, 2663.

certain series expansions involving Whittaker functions and Jacobi polynomials, 1424. changes of sign of sums of random variables, 662.

characteristic roots of quaternion matrices, 967. Chebyshev polynomials in the solution of large- scale linear systems, 411.

circular disks containing the eigenvalues of a matrix,

2650.

classes of matrices and quadratic fields, 205.

classes of positive definite unimodular circulants, 2057. commutativity in finite matrices, 2060. comparison theorem for eigenvalues of normal

matrices, 1231. complete sequences and approximations in normal

linear spaces, 2065. complex biorthogonality for certain sets of poly

nomials, 975. computation of cyclic cubic units, RP2783.

computation of the capacity of a cube, 779. computation of vibration modes and frequencies on SEAC, 1293. computational experience in solving linear programs,

672. computational problems in algebraic number theory,

1873. condition of a certain matrix, 149. condition of certain matrices, III, RP2815.

condition of matrices, 98. congruences for the coefficients of modular forms and some new congruences for the partition function, 2068. construction and application of a class of modular

• functions, 2069. continued fractions in high-speed computing, 612. convergence of a method of solving linear problems,

417. convergence of numerical iteration, 856. convergence of Seidel iterants of nearly symmetric

matrices, 329. convergence of the Rayleigh quotient iteration for the computation of characteristic roots and

vectors, 3003; 3004. dense subgraphs and connectivity, 2925. derivative of a polynomial and Chebyshev approxi- mation, 786. determinantal inequality, 1232; 2657. determinantal inequality of H. P. Robertson, 1980. determinanten mit ueberwiegender Hauptdiagonale und die absolute Konvergcnz von linearen Iterationsprozessen, 1671. determination of eigenvectors and eigenvalues of symmetric matrices, 330. 351
determination of the extreme values of the spectrum

of a bounded self-ajoint operator, 220.

direct approach to the problem of stability in the numerical solution of partial differential equations, 1588.

discrete analogs of inequalities of Wirtinger, 1313.

discrete approximations to elliptic differential equations, 1314. eigenvalues of sums of normal matrices, 1425. elementary inequalities relating to a gamma and

incomplete gamma function, 3047.

error bounds for the eigenvalues of symmetric integral equations, 1707. estimationof quadrature errors for analytic functions, 1096. European experience with electronic computers, 1336. evaluation of matrix inversion programs, 2814. evaluation of the integral e~ u2~ <*' u> du, 716. existence theorems and extreme solutions for ine- qualities concerning convex functions for linear transforms, 2115. experiments in the solution of differential equations,

1019. extension of Gauss' transformation for improving the condition of systems of linear equations, 393. extreme value results for indefinite Hermitian matrices, 2303. formal power series for log e

xe", 1931. formulas for calculating the error function of a complex variable, 241. formulas for finding the arguments for which a function has a given derivative, 242. formulas for numerical differentiation in the complex

plane, 453. formulas for numerical integration of first and second

order differential equations in the complex

plane, 61. foundations for applications, 1275. further contributions to the solution of simultaneous

linear equations and the determination of Eigenvalues, AMS49.

Gauss' speeding up device in the theory of single step iteration, 2659. Gauss to Gerling on relaxation, 244. generalization of a theorem of Osgood to the case of continuous approximation, 64. generation and testing of pseudo-random numbers,

1722. Gibbs' phenomenon for Euler means, 103. Gibbs' phenomenon for Hausdorff means, 65. Hilbert matrix, 2229. how to solve a linear programming problem, 1360.

identities and inequalities concerning orthogonal poly- nomials and Bessel functions, 249.

inequalities concerning ultraspherical polynomials and

Bessel functions, 72.

infinite integral, 270. Institute for Numerical Analysis of the National Bureau of Standards, 152; 337. integration of parabolic equations by difference methods, 497. inversion of matrices by random walks, 282. kleine Bemerkung zur asymptotischen Entwicklung

des Fehlerintegrals, 1383. Leonard Euler's integral: a historical profile on the gamma function, 2974.

linear functional equations and interpolation series, 1050.

linear iteration procedures for symmetric matrices,

1097. machine attacks on problems whose variables are per- mutations, 1762. mathematical services useful in industry, 759. matrix inversion, 84. matrix minimization problem, 1985. matrix, principal submatrices of a fullrowed non-negative, J 63B1, 19.

method for the determination of converging factors, applied to the asymptotic expansions for the parabolic cylinder functions, 366. method of speeding up iterations with superlinear convergence, 2427. methods for evaluating trends in time series of tropospheric radio field strength data, 546. metodi probabilistici per la soluzione numerica di alcuni problemi di analisi, 763. minimum of the permanent of a doubly stochastic matrix, 3008. modified divided differences, 1092. Monte Carlo calculations of 7-ray backscattering and

transmission, 1076. Monte Carlo experiments in computing multiple integrals, 1875. motivation for working in numerical analysis, 1410. multiple-purpose orthonormalizing code and its uses, 921. Neumann series for the product of two Whittaker

functions, 630. new matrix transformations for obtaining characteristic vectors, 267. number of absolute points of a correlation, 1943. number of representations of a quadratic form as a sum

of four squares, 2375. numerical analyst's fifteen-foot shelf, 631. numerical experiments in potential theory using ortho- normal functions, 1789. numerical experiments in potential theory using the Nehari estimates, 2654. numerical integration of periodic analvtic functions,

3009. numerical methods associated with Laplace's equation,

274. numerical solution of equations involving differential operators with constant coefficients, 502. numerical solution of the helium wave equation with SEAC, 372. numerical study of Dedekind's cubic class number for- mula, RP2798.

over and under relaxation in the theory of the cyclic single step iteration, 781.

pairs of matrices of order two which generate free groups, 2242.

pitfalls in computation, 1809. polya frequency functions. Ill, The positivity of translation determinants with an application to the interpolation problem of spline curves, 782.

practical evaluation of integrals, 1098. probability of a saddle point, 2379. problem in the theory of mechanical quadratures, 1423. proceedings of the Second Symposium in Linear Pro- gramming, held jointly by the National Bureau

of Standards and the United States Air Force,

1458. radix table for obtaining hyperbolic and inverse hyperbolic functions to many places, 810.

relative extrema of Bessel function, 104.

relative extrema of the Hermite orthogonal functions,

283. relative extrema of the Laguerre orthogonal functions,

105. relative extrema of ultraspherical polynomials, 106. relaxation and step-by-step methods, 301. relaxation method for linear inequalities, 1196; 1197. remark on the smoothing problem, 931. representation for solutions of analytic systems of lin- ear differential equations, 932. representation of a certain integral involving Bessel functions by hypergeometric series, 2236. rounding off of difference tables for linear interpolation, 504. smoothing operations and their generating functions,

783. solution of differential equations, by recurrence rela- tions, 97. solving linear algebraic equations can be interesting, 831.
some inequalities concerning positive-definite Hermitian matrices, 149G.

stable systems of differential equations with integrable

forcing term, 1893. subdeterminants of doubly stochastic matrices, 2227. subroutine for computations with rational numbers,

1603.

sufficient conditions for the convergence of Newton's method in complex Banach spaces, 559. summation method of 0. Perron, 102. summation of slowly convergent series, 145. symmetric functions of eigenvalues, 1990. systems of equations, matrices, and determinants, 562. systems of inequalities involving convex functions,

" 2335. Tauberian theorem for Abel summability, 275. Tauberian theorems for summability, 321. theorem of Ostrowski and Taussky, 1091. theorem of M. Riesz, RP2935.

topological proofs for certain theorems on matrices with non-negative elements, 2850. two consequences of the transposition theorem on lin- near inequalities, 353. two explicit formulae for the distribution function of the sum of n uniformly distributed independent

variables, 609. two problems in abstract algebra connected with Horner's rule, 1101. uniqueness theorv for asvmptotic expansions in general regions, 2400. values of a quadratic form, 2186.

variation of the determinant of a positive definite matrix, 284. vibration of a square clamped plate, 1435. Vincent's theorem, 96. use of random numbers, 613. weighted restricted partitions, 3112.

zero of I„+,(i)Jn(a;)I»+i(*), 624.

zeros of polynomials and the degree of linear systems,

790. Numerical, computation, exponential integral, RP2941.

differentiation in the complex plane, formulas, 453. evaluation of the Fermi beta-distribution function,

100. evaluation, Simpson's rule, Weiner's integrals in function space, 185. experiments in potential theory using orthonormal

functions, 1789. experiments in potential theory using the Nehari

estimates, 2654.

integration, formulas for, 61. integration of periodic analytic functions, 3009.

integrations of differential equations and for Gaussian

quadrature, use of sub-routines SEAC, 598.

iteration, convergence of, 856. methods associated with Laplace's equation 274. solution of certain problems in analysis, probability methods, 763. solution of equations involving differential operators with constant coefficients, 502. solution of partial differential equations, 1588. solution of the helium wave equation with the SEAC,

372. study of Dedekind's cubic class number formula, RP2798.

values of the intensities of the Stark components of the hydrogen lines and the Stark broadening

functions, C603. Nylon, cotton, and wool fabrics at different temperatures and relative humidities, 2793. 02 , and N2 , low energy ions in, 982. photodetachment, 2684. Obituary notices on L. F. Richardson, 1088. Object-color changes from daylight to incandescent fila- ment illumination, 492. Oblique incidence propagation at 300 kc using the pulse technique, 493. Oblique-incidence, ionograms, TN31 (PB151390).

osphe e at 41

measurements of the heights at which ionospheric

scattering of the VHP radio waves occurs, I 7'M). Observation, audio-frequency electromagnetic noise during a period of solar disturbance, 2019.

vertical-incidence scatter from tl Mc/sec, 2655. Observations, abrasion testing, 1089. distance meteor-trail echoes followed by ground scatter, 1421. evaporation of water from cellulose, 547.

field exposures of enameled ranges, 1090. hydrated monocalcium aluminate and monostrontium

aluminate, RP2777.

miscellaneous, on the ;il kali-aggivgat i- read ion and I he

ionic charge on hydrated cement, 2639.

outlying, rejection of, 813. second sound radiation by the thermal Pitot tube, 101. sweep-frequency backscatter, note on, 924. Observatories, geomagnetic and thesaurus of values, 252. Observer differences in color-mixture functions studied by means of a pair of metameric grays, RP2825!

Obukoff and Heisenberg theories of turbulence, 1215. Ocular pigmentation, tritanopia, 161. OD and OH in electrodelen discharge through water vapor,

rotational intensity distributions of, 817. o-fluoro-benzidines, 837. Otr-path propagation at VHF, 2656. OH, OD in electrodelen discharge through water vapor,

rotational intensity distributions of, 817. CH, and HCO in flame spectra, using deuterium as

tracer, mechanism of formation, 868.

effects of vibrational state on rotational intensity

distribution, 701. emission in the earth's atmosphere, 3001. emission spectrum, from 1.4 to 1.7 y., 860.

flames, effects of self-absorption of rotational "temperatures", 700. methane-air flames, rotation temperatures, 304. several flames, rotational temperatures, 534.

radical, dissociation energy, 1503.

rotational "temperature", in diluted flames, 818. rotational "temperatures" in low pressure flames, ex- perimental evidence for existence of abnormal,

1339.

solar spectrum, J 63A3, 279.

(22+) in flames, 1348; 2941.

2 2+, wall effects on rotational population, 2865. Ohmmeter, logarithmic, 1619.

Oil flow in plain journal bearings, 494. Oil-soaked felt-pad lubrication of ball bearings at high speed and high temperature, 1422.

Oils used in oil-extended rubber, RP2771.

Olefins, solid, at —195°, reaction of hydrogen atoms, 2828.

solids at —195°, the addition of hvdrogen atoms, 2803. Oleophobic films on metal fatigue, effect of, J 64C2, 147. On-off temperature control for electrically heated fila- ments, 2459; 2660. One-microsecond, adder using one-megacycle circuitry, 1596. , . , parallel adder using one-megacycle circuitry, logical design, 1937. Operating, characteristic of the average chart, 588. instructions for ARN-2 auxiliary log-linear noise re- corder, TN45 (PB151404).

rooms, conductive flooring for hospital, J 63C2, 1/5. Operation, bearings and pumps at low temperatures, 2676. construction of a high pressure diff usion cloud chamber,

construction of thoria resistor-type furnaces, 328. smoothing, and their generating functions, 783. Operations research, design of experiments, 1670.

Optical, bench, 2948. , i . ,. detection of narrow Rb87 hyperfine absorption lines, 2677. ,. . , , electrical properties of gray tin, studies of crystal growth, 1518.

electrical properties of intermetalhc compounds, 1UU/,

1330.

electron, exploration of space, 230. 353
electron, properties of space charged clouds, 53. glass production in the United States, history of, 731.

glasses, relative stress-optical coefficients of, RP2779.

image, electron, of an atomic beam, 1704. image evaluation, report on the NBS, symposium, 532. measurements, 2790. merit function and its derivatives with respect to the system parameters, calculation, 2041. model for nucleon-nuclei scattering, 395. properties of cesium iodide, 1436. radio data, 2874.

rotation of polarized light by chemical compounds,

285. shadow method, electron, modification of electron microscope, 91. spectrophotometric analysis of hydrogen-deuterium

mixtures in presence of air, 505. spectroscopy, stable carbon isotope analysis, 1892. spectroscopy, stable nitrogen isotope analysis, 2775.

studies at low temperatures, 2575. system, 235. systems for increasing the available intensity from

flames, 506. T-bench method of measuring longitudinal spherical aberration, RP2880.

test for spherical aberration, 950.

Optics, applied, at NBS, 226; 655.

electron, 286. geometrical at V.L.F. sky wave propagation, 2360. Optimum, antenna height for ionospheric scatter propagation, 3011. frequencies for outer space communication, J 64D2,

105. grouping on one-criterion variance components analysis, 1102.

Orbits, satellite, effect of transverse atmospheric drag, 2532.

satellite, unretarded, new method of solution, J 63B2,

105. Ores, corundum, 1081. Organic, coatings, abrasive jet method for measuring

abrasion resistance, 1249. evaluation of adhesion of, by ultracentrifugal and

other methods, 715. Organic, phosphorus chemistry, 2494.

plastics, 109. solutions, electrodeposition of metals, 1696; 1697.

solvents, electrolysis of, with reference to the elec- trodeposition of metals, 2936. substances and atomic nitrogen, 2544. Organizing a network of computers to meet deadlines, 2240. Orientation, variations in preferred, and modulus of

elasticity in cold drawn music spring wire, 1573.

Orifice meter tests, 128. Origin, current nomenclature for the ionospheric layers, 3086.

electronically excited C2 radical in hydrocarbon

flames, 1434.

[OI] 5577 in the airglow and the aurora, J 63D1,

15. "very-low-frequency emissions", J 63D1, 21. Ortho and parahydrogen, flow conversion kinetics, 2953. Orthogonal, Hermite, functions, 283. Laguerre, functions, relative extrema, 105. polynomials, AMS49.

polynomials and Bessel functions, 249. Orthonormalizing code, multiple-purpose, its uses, 921. Orthoparahydrogen conversion catalyst, 3017. Ortho-para, catalysis in liquid-hydrogen production, RP2840.

conversion of liquid hydrogen in the large CEL-NBS

liquefier, new arrangement, 1988. Ortho-parahydrogen, conversion, catalysis, 2048. converters, design data, 2514. mixtures, continuous analysis, 1294. Orthophosphate, anhydrous gallium, temperature in- version, 1916.

Oscillations, nonlinear, singular perturbation methods,

superposed fluids, stability, 1890.

Oscillator, audio, low-distortion transistor, 755. cathode-coupled, 62. constant-amplitude, 210. high-stability bridge-balancing, 1358. locked, modified, frequency dividers, 261. locked, pulse timer, 634. R-C, wide-range, 171. stable-output, 552.

transistor, precision, 799. X-band, stabilization, high-order harmonics, 2153.

Oscillators, anharmonic, the vibrational relaxation of a system, 2786. harmonic, 1847; 2235. harmonic, the relaxation of a system, 2324.

rotating, 2787. subharmonic crystal, 1154.

Oscillatory, galvanomagnetic effects in re-type indium

arsenide, 2678. interpolation coefficients, tables, AMS56.

interpolation in the complex plane, formulas for, RP2792.

Osgood, theorem of, to the case of continuous approximation, generalization, 64. Osmometer, block-type, design and performance, RP2931.

Hepp-Scatchard, improved, 1362. Outgoing letter mail characteristics, some applications of

statistical sampling methods, TN16 (PB151375).

Outline of characteristics of an image-forming system, 1801. Output of a sound source in a reverberation chamber and

other reflecting environments, 2679. Output-input, key or bottleneck, 2601. Over and under relaxation in the theory of the cyclic single step iteration, 781. Oxidation, behavior of enameling iron during firing, 1153.

cellulose by ozone in small concentrations, 589.

cool flame, of propane-2-C13

, products, 2702.

cool flame, of propane, separation, 2753. D-mannitol-2-C14 by acetabacter suboxydans, isotope

effect, 2606. elevated temperatures, protection of molybdenum

from, 2705. periodate, and isotope dilution techniques, 2319.

studies of some natural graphites, 1437. Oxidative degradation, series of deuterated styrene polymers, 2680. styrene and a-deuterostyrene polymers, 1802. Oxide, binary, systems, zirconia reactions, 1978. cathodes, measurement and theoretical study of electrical conductivity and Hall effect, 1063. ceramic, single crystals, plastic deformation, 2253.

electrode, silver-silver, 1998. high-density thorium, some physical properties, 1877. magnesium, in cement, 925.

nitrous, near infrared spectrum, 1782. potassium, 3059. strontium, content of portland cements, 2382.

tin or titania containing varying proportions or rare- earth oxides, dielectric properties, 2520. tribenzylamine, in benzene and water, 1195. Oxide systems, immiscibility in, structural interpretation, 2320; 2320A.

structural interpretation of immisicibility, 2320; 2785. Oxide-germanium, magnesium dioxide, 3094. Oxides, metal, with o-ethyoxybenzoic acid and other

chelating agents, 2829. R2 03 , studies of beryllium chromite and other beryllia compounds, J 64A1, 103. Oxyacetylene (lame spectra, emission of, under high resolution, RP2903.

Oxygen, carbon, hydrogen, and nitrogen, calorimetric combustion in a bomb of compounds containing,

1645. chemisorption on carbon adsorbents, 1438. compressed, microwave absorption, 1408.

354
content of the furnace atmosphere on the adherence of vitreous coatings to iron, effect, 1329. diatomic molecules, nitrogen, nitricocide, and their molecule ions, 2394.

difluoride by electron impact, 2169. discharge products and ozone at 4°K, infrared absorption, 2599.

effect on the bonding of gold to fused silica, RP2942.

5577 emission in the upper atmosphere, excitation mechanisms, J 03D3, 319. Herzberg band of O2

, 1185. hydrogen atoms in atomic flames, reactions of ammonia and hydrazine, 1948. hydrogen, reaction at the second explosion limit, 248.

ions, negative, in the upper atmosphere, 1413.

liquid, survey of hazards of handling, 2333.

liquid, transfer lines, characteristics of some insulations, 2054. microwave absorption as a possible atomic frequency

standard, experimental evaluation, 2555.

nitrogen, and air, rotational relaxation, 3038.

nitrogen, hvdrogen, water, and ammonia, electric discharge', 2309.

photolvsis, in solution in liquid nitrogen and in liquid carbon monoxide at 1849 A, 3013. quenching and wavelength shifters in liquid scintil- lators, 1439. red lines in the airglow, 2681. red lines in twilight, excitation, 2554.

role of, in the quenching of liquid scintillators, 1858. storage dewars, breathing, 2038. sulphur, diatomic free radicals of the isotopic hvdrides,

1357. water vapor absorption of radio waves in the atmosphere, 2241. Oxvgen, atomic, and carbon monoxide, 866. electron affinity, 1334; 2812. low temperatures, 2954. photodetachment cross section and the electron affinity, 2683.

solid ozone, note on the preparation, 1239. Oxyquinolate determination of magnesium oxide in cement,

925. Ozone, atmospheric, 977. atomic oxygen at low temperatures, 2954. 4°K, infrared absorption of oxvgen discharge products,

2599. oxidation of cellulose, in small concentrations, 589.

solid and atomic oxygen, note on the preparation,

1239. p

p-dihalobenzenes, preparation of two fluorinated, 879. Packages, checking, H67.

Pads, attenuator, lossy cable, 754.

Pairs, of matrices of order two which generate free groups, 2242. matrices with property L, 507; 791; 1440. normal matrices with property L, 792. Panoramic X-ray dental machine, 1993. Paper and pulp, 805. annual review, 1466; 2024.

industry, annual review, 1627. Paper, bursting test, diaphragm error and testing rate, 428. chemical tests, 227. chromatographic analysis for collagen and collagen

derivatives, 1597.

glass fibers, manufacture, 477. laminated map, improved dimensional stability, 2595. measuring the stiffness, 762. milk containers, 1441. new, products in competition with textiles, 1784. production on the upswing, 1103.

stiffness of, 883. Papers, coated groundwood, effect of light, 1327. cylinder functions, asymptotic expansions, 366. equations by difference methods, integration, 497. experimental map, containing synthetic fibers, 2703.

glass fiber, 1026.

record, and their preservation, 1S40. Parahydrogen and ortho, flow conversion kinetics, 2953.

Parallel testing interferometer, RP2917.

Paramagnetic, relaxation, dispersion function, 2418.

salts, properties of, 2408. Parameter, continuous time, sequential decision problems

for processes, 824.

design, galvanometer efficiency, 1717.

large values of, Mathieu's equation, 1523. Parameters, certain stochastic processes, estimation, 334.

circuit, effect of variation, on the excitation of spectra by capacitor discharges, 696. 15-Mev X-rays scattered by C12

, 1803. Parity conservation, scintillation counting in experiments,

2749.

Partial, Grotrian diagrams of astrophysical interest, 1758.

reflections in tropospheric propagation, 508.

Partially, balanced designs, 1148. replicated latin squares, 1442. Path antenna gain in an exponential atmosphere, J 63D3,

273. Pattern, of a flush-mounted microwave antenna, RP2796.

antenna on a curved lossy surface, 2682. synthesis for slotted-cylinder antennas, J 63D3, 303. Patterns, of a slot-array antenna on a finite and imperfect ground plane, 2826. smooth, of production, 1139. Payroll processes at the National Bureau of Standards,

conversion, 2070. Peek-a-boo system, 3087.

Pellat-tvpe electrodynamometer, measurement of current, RP2845.

Pellets, preparation of sodium amalgam in the form of, J 64A1, 135. Penetration, and diffusion of hard X-rays: polarization

effects, 793.

diffusion of X-rays: calculation of spatial distribu- tions by semi-asymptotic methods, 509.

electron, theory, 1548. gamma rays from isotropic sources through aluminum

and concrete, TN11 (PB151370).

Pentaborane-air flames and explosions, spectroscopic

observations, 1883. Pentafluorohalobenzenes, reactions, J 63A2, 167. Pentosan, aldehyde, carboxyl, and degree of polymerization data on the ICCA "standard" pulps, 2890.

Perchloric acid-silver perchlorate solutions and conductivity water, stability of silver and Pyres, J 64A1,

127. Perchlorylfluoride by electron impact, dissociation and

ionization, 2170.

dipole moment, 2089.

infrared spectrum and structure, 1933. search for the microwave spectrum, 1863. Performance, of pumps with liquefied gases, 2243. three-millimeter harmonic generators and crystal detectors, 2244.

Periodicals and serials received in the NBS Library, C563,

1st Suppl. . Permeability and some other properties of a variety ot refractory materials, 794. Permissible, body burdens and maximum permissiblr concentrations to radionuclides in air and in water

for occupational exposure, H69.

exposure to ionizing radiation, 1443. lower, levels of atomic operations in the United States,

influence, 2598. Perron, O., summation method, 102. Perturbation, characteristic functions and their application to electron optics, 286. petroleum, hydrocarbons, 107. vibrational equilibrium distribution reactant molecules by chemical reactions, 2671. pH. and the modern analyst, 2242A. 35^
control, alkaline solutions, 1612. measurements, meaning and standardization, 1767. standards at 60° to 95° C, RP2797.

tartrate buffer solutions, 262. values in nonaqueous solutions, 1563. Phase, constant vector plus a Rayleigh-distributed vector, mean absolute value and standard deviation RP2950.

diagrams distribution, of interest to ceramists, 1318. diagrams of interest to ceramists, compilation, 1656.

equilibria in the subsystem barium disilicate-dibarium

trisilicate, RP2953.

equilibrium diagram of the binary system calcia- titania, showing the compound Ca4 Ti'3 Oio, re- vision, RP2913.

equilibrium relations in the binary system lead oxide-niobium pentoxide. RP2925.

generator for tropospheric research, 1805.

shift effects in Fabry-Perot interferimetry, J 64A3,

191.

stability, measurements of, over a low-level trop- ospheric path, J 63D1, 45. Phenomena, electron scattering, 2

1 09. Phenomenological theory of induced electrical polarization, 2431. Philosophy underlying radiation protection, 2376. Phosphate, aluminum and gallium, low cristobalite type,

crystal structure, 1 923. anhydrous indium and thallic phosphate by X-ray

diffraction, crystal structure, 1667. anhydrous scandium, structure, 1950. determination, by differential spectrophotometry,

685. hydrate, tricalcium, crystallographic investigation, 421.

silicate, and arsenate, separation and determination, RP2954.

zinc, and silicate cements, 2873. Phosphates, calcium, precipitated basic, pyrophosphate

formation upon iginition, 1465. Phosphinoborine compounds: mass spectra and J 63 Al,

63. Phosphor matric, plastic, for fast-neutron detection, 2693. Phosphorescence of atoms and molecules of solid nitrogen

at 4.2°K, 1104. Photochemical, and thermal processes in polystyrene in the glassy state, 1958. degradation of solid polymers, 2455. Photoconductivity, and photovoltaic effect in inter- metallic compounds, 1806.

infrared, due to neutral impurities in germanium,

1039. Photocross, analysis, 2460. Photodetachment, atmospheric negative ions, 2245.

cross section and the electron affinity of atomic

oxygen, 2683.

cross section and the ionospheric detachment rate for 0~

2 , 2556.

cross section for H

-

, relative measurement, 3035.

cross section of the negative hydrogen ion, 3012. diatomic molecular negative ions, 2841.

electrons from H- and D-, experimental cross section, 1338.

05, 2684. hydrogen negative ion, 1105. studies of negative ions, 2246. Photodisintegration of helium 4, 1106. Photoeffects in intermetallic compounds, 1444. Photoelastic constants of some optical glasses, RP2779.

Photoelasticity to the design of tensile specimens for ceramic metal materials, application, 1266.

Photoelectric, and bremsstrahlung, effect as inverse

processes, 2905.

cross sections of copper, molybdenum, silver, tantalum, and gold at 662 kev, 3101.

determination of image contrast suitable for using

j square wave targets, equipment and method,

J 64C1, 57.

effect, Sauter theory, 3040. followup and recording system, and its application to remote observations of the beam in high precision balances. J 63C2, 91. method, automatic, continuous measurement of at- mospheric ozone, 977. multiplier tubes, 27. reflectometry, Becker value of manila rope by, 960. \ Photoemission from silver into sodium chloride, thallium

j chloride, and thallium bromide, 1807. Photoflash cells, standard test, 1506. Photographic, developers, sodium carbonate in, note on ! the estimation, 1238. dosimetry at total exposure levels below 20 mr, TN29 ! (PB151388).

dosimetry of X- and gamma-rays, 2611.

film and dental X-ray film, 2091. image, formation of silver sulfide in, during fixation, i J 64Cl,^5.

lenses, spurious resolution, 315.

lenses, testing, 1169. personnel dosimeter for X-radiation in the range from \ 30 kev to beyond 1 Mev, 1994.

Photolysis, absolute light-scattering: I. Design and J operation, RP2946.

determination of tungsten in steel and titanium alloys i with dithiol, RP2812.

flame, determination of manganese in cement, 1930. flame, determination of strontium in portland cement,

1346.

flash, of chlorine monoxide, 2357. measurement of the effective intensity of condenser- \ discharge lights, 2685. observations of the airglow, 2247. oxygen in solution in liquid nitrogen and in liquid carbon monoxide at 1849 A, 30 i 3. unit for the airglow and aurora, 1598. Photometry, absolute, of the Gegenschein, 1919.

airglow, review of observational results, 1242.

projection, versatile goniometer for, 904. Photomicrography, high speed, cutting characteristics of j dental burs, 2076. Photon, scattering and self absorption in lead and bismuth

at 7 Mev, 3014.

self-absorption and scattering by the 15.1-Mev level in C12

, 2248. Photoneutron, yields in the rare earth region, 2249; 2686. Photons, cascade, and electrons, energy spectra, RP2824.

elastic scattering of, 1006.

elastic scattering of, by tantalum, 2535.

1 Mev, 1170. nuclear elastic scattering, 1086; 1787.

vs electrons: a comparison of microscopes, 54. X-rays, 1136. Photonuclear, effect, long-range correlation model, 2669. pseudodeuteron effect, 2978.

reactions, 2497. Photoproduction of neutral mesons from carbon near

threshold, 2250. Photoreconnaissance, aerial, and spectrophotometry, 2308. Phototropic dyes, shutter-illumination device for the study,

374. Phototroprism and cis-trans isomerism in aromatic azo compounds, 593. Phototube noise, multiplier, hysteresis effect, 1361. Photovoltaic and photoconductivity effect in intermetallic compounds, 1806. Physical, and chemical properties of chrome-tanned leather and the election of sampling location, study of the variation, 558. chemical properties of split and unsplit chrome-tanned

leathers, variation, 601. chemical properties, review, direct and indirect filling resins, 688. 356
chemical properties within and between vegetable re- tanned cow and steer sides, variations, 618. chemistry of synthetic rubbers, 1107. constants at the (United States) NBS, present status

of research, 2263.

equilibria and related properties of some cryogenic systems, a bibliography, TN56 (PB161557).

mathematics, 1445A. measurement and medicine, 795. phvsico-chemical constants of leather and collagen, 510. properties of chromium cobalt alloys, 2687.

properties of electrodeposited metals, I: Nickel, 3: The effect of plating variables on the structure and properties of electrodeposited nickel, 511. properties of gallium copper-tin alloys, 1876. properties of glass-fabric reinforced polyesters, 1004. properties of high-density thorium oxide, 1877. properties of plastic teeth, 2688.

properties of terpenes. III. The vapor pressures of alpha pinene and beta pinene, 1191A.

standards for the electronics industry, 1808. standards, national, and design of experiment, 2210. titanium carbide type cermets at elevated temperatures, characteristics, 1445. Physical-chemical studies of the destructive alkali-aggre- gate reaction in concrete, RP2780.

Physics, and electronics, dictionary of, contributions, 1660A.

elasticity of rubber, 2251.

electrostatic field and the symmetry of snowflakes,

2689. chemical and engineering measurements, how statistics improve, 68. experimental, 2990. low temperature, 1055; 2180. measure for measure: some problems and paradoxes

of precision, 287. neutron, 2500. polymer, and their relation to dielectric properties, 2440. pure and applied, 189. units and dimensions, 611. Physiological monitor for anesthesia, 1446.

Picric acid, 1085.

Piezoelectric, accelerometers, cemented, 660. constants of alpha- and beta-quartz at various temperatures, 108.

effect in indium antimonide, 2690.

elastic, dielectric constants of quartz, method for dynamic determination, Mono. 9. Piezoresistance of indium antimonide, 2252.

Piezoresistivity of semiconductors, apparatus for measuring, RP2814.

Pigmentation, ocular, tritanopia, 161.

Pile oscillator measurements of eta, 3015.

Pillowcases and sheets, standards help in the selection, 136. PILOT, a new multiple computer system, 3016. NBS multicomputer system, 2692. plant studies of the low temperature distillation of hydrogen isotopes, 2691. plant study of the process for treating heavy leather with polyisobutylene and other polymers, 1240. Pion, coherent neutral, production, nuclear matter distri- butions, 2653. Pipe flow, fully developed, structure of turbulence, 884.

Pipes, asbestos-cement, 998.

Piston, attenuator, chart for TEn model, 664. gage as a precise measuring instrument, 877. gage, dead weight, 2103. gage for pressures below one-half inch of mercury,

tilting air-lubricated, J 63C1, 47.

Pitfalls in computation, 1809.

Pits, in metals caused by collision with liquid drops and

rigid steel spheres, J 64A1, 61. metals caused by collision with liquid drops and soft metal spheres, RP2958.

Plan for studying the accuracy and precision of an analytical procedure, 926. Planet, lost, and Tektites, 1525; 1912. Plant fibers, 1181. Plasma, electromagnetic waves, 3023.

infinite conductivity, structure of a magnetohydro- dynamic shock wave, 1902.

jet as a spectroscopic source, 3088.

oscillations, solar "enhanced radiation", 544.

solar, condition for radiation, 414. Plasmas, conductivity of, to microwaves, 2914.

Plaster, setting of, 3058.

Plastic, acrylic, glazing, 699.

elastic behavior of the ferrite lattice in low-allov steel, 1691. Committee, International, considers standard tests, 1376. deformation of ceramic-oxide single crystals, 1 108 ; 2253.

electrets and their applications, 797.

electrets, transparent, 796.

films, and coated fabrics, 1337.

films, comparison of methods of measuring the tensile and tear properties, 1290.

films, properties of, 1122.

fired, refractories and other more resilient materials, dynamic and static tests for mechanical properties, 1684. foams, low temperature properties, 2620.

insulating, foams at low temperatures, 2985. phosphor matrix for fast-neutron detection, 2693.

refractories, 2289.

springs, 1810.

springs, reinforced, 1843.

steel surfaces on clotting time of human blood, effect

of, 1003.

teeth, bonding of, to heat cured denture base resin, 402.

teeth, physical properties, 2688.

teeth, proposed specification, 2272.

Plastics, 512; 1811; 2254.

aircraft, 2255. eye protection, spectratransmissive properties, 1547.

filled, surface erosion, 2792.

glass-fiber reinforced, effects of molding pressure on

strength properties, 2533.

glazing, acrylic, 1065.

glazing, by multiaxial stretching, 2084.

industry, standardization research, 1857. industry, standards and research for, 1130.

irradiated, films, 3056. laboratory aging tests for, fluorescent sunlamps,

1713. laminated, fuel-immersion, 50. literature in Government reports, 1109.

organic, 109. resistance to tension, 1855. standards, 1509. tension testing, 2341.

test, methods, specifications, and standards, 1167. thermosetting, at low temperatures, 464. transparent, creep behavior, 2921. transparent, effects of multiaxial stretching on crazing, 1002. transparent, effects of multiaxial stretching on crazing and other properties, 1690. year 1952 in review, 894. Plate separation requirements for standard free-air ioniza- tion chambers, 1110.

Plates, electrostatic deflection for cathode-ray tubes, J 64C2, 103. external, grounded, electrostated fields, 1066.

ship, analysis of brittle behavior, 954. square clamped, vibration, 1435. Plating at NBS, research, 2736.

electroless, 1010.

electroless nickel, 2327. , m-Kr A a experimental, of gun bores to retard erosion, lJN4b (PB151405).

standards and specifications, 1447. 357
Platiniferous materials, chemical methods for separating and determining metals contained in, 668. Platinum-uranium system, J 64A1, 107. Plumbing, drains, capacities, 2489.

stacks, capacity, 1281. system design, 239. Pneumatic, components and systems, pressure drop, 1456. components, determination and correlation of flow

capacities of, C588.

valves, characteristics, pressure flow, discussion of paper, 2092. Point Barrow, Alaska, layered earth propagation in the

vicinity of, J 64D1, 95. Point-to-point radio relaying via the scatter mode of tropospheric propagation, 1812. Poisoning and reactivation of orthoparahydrogen conversion catalyst, 3017.

Poisson, and Bernoulli, positive, variables, tables of ex- pected values of 1/X, 1161.

distribution, mean deviation, 2823. Poisson's ratio for copper wires, measurement of the re- sistance-strain relation, 1768.

ratio of aircraft sheet materials for large strains, 798. Poker model, continuous, symmetric, J 64B1, 35. Polar, blackout occurence patterns, 2256. blackouts, geographic and temporal distribution of, 1024.

Polarization, bremsstrahlung, measurements, 1643. concentration, 2605.

effects: penetration and diffusion of hard X-rays,

793. energy for 3d and 4p electrons, 1448. high-frequency limit of 500 bremsstrahlung, 2694. induced electrical, 2431.

limiting, of magneto-ionic waves, 583. low frequency ionosphere echoes, 371. measurements of low-frequency echoes, 513. quantum mechanics, 936.

sferics, 2257. sweep frequency, measurements at low frequencies, technique for, 938. Polarized CO56 and CO68

, absence of interference effects

in the /3-decay, 2006.

light, optical rotation, by chemical compounds, 285. manganese-52, beta-gamma correlations, 2473.

nuclei, beta-decay, 2557.

nuclei, /3-decay of, further experiments, 2132.

nuclei, beta gamma correlation, 2902. waves, VHP1 tropospheric recording measurements of plane and circular, in the Great Lakes area, 620. Polarographic determination of trace quantities of iodide, 2258.

Pollution, air, determination of carbon monoxide in studies, 1309. Polya freauency functions, III, The positivity of transla- tion determinants with an application to the

irterpolation problem by spline curves, 782.

Polyacrylonitrile, polybutadiene, and copolymers of butadiene with acrylonitrile and styrene, thermal

degradation, RP2888.

Poly-alpha-methylstyrene, pyrolysis, 2707. Polyamides, influence of impurities on the pyrolysis, J 63A3, 269. pyrolysis of, RP2819.

Polyatomic molecules, 1144. Polybutadiene, and benzene, heat of mixing, RP2921.

Polybutadiene-benzene, some thermodynamic properties of the system, RP2820.

Polybutadienes, melting behavior, 1938. Poly(chlorotrifluoroethylene), semicrystalline, specific volume and degree of crystallinitv, RP2862.

specific volume and degree of crystallinity, 2831.

Polycrystalline aluminum alloys, crystal orientation on

fatique-crack initiation, 2096.

materials, magnetic properties, 2980A.

Polyester, film, tensile properties, 2354.

laminates, effect of humidity during fabrication, 435. 358

Polyesters, absorption on glass, silica, and alumina, RP2933.

glass-fabric reinforced, 1004. Polyethylene, and fibrous, low-angle X-ray diffraction, 2616.

glycol electrolytes, punched-cell batteries, 1828. oxide and polypropylene oxides, thermal degradation,

3100. polymethylene, depolymerization, 985. polystyrene in a vacuum, rates of thermal degradation,

526. polystyrene, thermal degradation, 1209. Polygonal membranes, asymptotic lower bounds for the frequencies of, 957. Polygons, algebraic proof of the isoperimetric inequality, 1259. Polyhedra, convex, integral boundry points, 1743. flames with hydrogen and hydrocarbons, 514. Polyisobutene-benzene, some thermodynamic properties of the systems, RP2820.

Polyisobutylene, and other polymers, pilot plant study of the process for treating heavy leather, 1240. dynamic compliance, dynamic modulus, and equivalent Voight and Maxwell models, 692. dynamic mechanical properties, 1183. rheology, 1132; 3037. treatment of leather, 607.

viscosity, 1182. Polyisobutyienes on shearing in solution, degradation, 682. Polymer, crystals with folded chains in dilute solution, theory of formation of, J 64A1, 73. degradat ion studies bv absorption and mass spectrometry, 515.

dilute, solutions, 141; 166. formation and decomposition, 2631. molecules, flexible, crystallization, 1924. molecules in solution, rate of thermal diffusion, 1472. networks formed from oriented chains of natural rubber, some properties, 2765. networks, isotropic length, 2370.

physics, and their relation to dielectric properties, 2440.

solutions, concentrated, kinetics of capillary shear degradation, 1753.

solutions, effects of capillary shape of flow characteristics and degradation, RP2839.

structure research at the National Bureau of Standards. 1813. Polymer-diluent mixtures, 1382. Polymeric, amorphous high, systems, viscoelastic phenomena, 2863. systems, crystallization kinetics, 2507; 2923. Polymerization, data on the ICCA "standard" pulps, 2890. methyl methacrylate, accelerating effect of aminos,

1608. methyl methacrylate, sulfinic acid derivatives as accelerators, 1906. shrinkage and water sorption, dimensional changes:

direct filling resins, 689. sorption of water by polymethyl methacrylate, effect of temperature and degree, 1328. temperature rise, direct resinous filling materials, 223. Polymers, a and /3 deuterostyrene, pyrolysis, 1464. amorphous, over an extended temperature range, volume temperature, 1975. atomic radiation, 1634. chemical structure and stability relationships. 2910.

crystalline, 3083. degradation of, 976. deuterated styrene, 2680.

effect of structure on the thermal decomposition of, RP2860.

effects in, mechanism of high energy radiation, 2194.

effects of atomic radiation on, 698. exposed to high-energy radiation, factors influencing the behavior, 1343.

glass formation in: the glass transitions of the poly-

(n-alkyl methacrylates), 2142.
glass formation. II. Rubber-sulfur system, RP2944.

high, degradation, 43. high, mechanical properties, 2630. high temperatures, thermal degradat ion, J 03 A3, 201. high, thermodynamics of crystallization; gutta

high, thermodynamics of crystallization: natural

rubber, 1558.

high, thermodynamics of crystallization, polyethylene), 2846. hydrocarbon, pyrolysis, 116. kinetics of crystallization in, 1047; 1382.

les rayons et les neutrons, degradation, 681.

sole leather, impregnation, 2594.

solid, photochemical degradation, 2455. styrene and acrylate, in a vacuum, 811. styrene and a-deuterostvrene, oxidative degradation,

1802. thermal decomposition, 1556. thermal degradation at low rates, RP2957.

thermal degradation of, as a function of molecular

structure and branching, 1557. thermal degradation, temperatures up to about 800-900°C, 2843. Polymethyl, alpha-chloro-acrylate, properties, 520. melting transition of, 869. methacrylate, 838; 999; 1328. methacrylate and polystyrene, gamma irradiation, 2138. methacrylate at various temperatures, stress and

strain at onset of crazing, 555; 669. methacrylate, determination of monomer content,

1673. methacrylate: dilute solution thermodynamic behavior

of flexible chain molecules, 687. methacrylate, fracture phenomena and molecular

weight, 2569. polyethylene, depolymerization, 985. Polymorphism in barium disilicate, 3018. Polymorphs of silicon dioxide and germanium dioxide, infrared studies, RP2885.

Polynomial Chebyshev approximation, derivative, 786. legendre, 659. Polynomials, Chebyshev, in the solution of large-scale

linear systems, 411. Chebychev, use of, in thin film computations, J 63A3,

297. complex biorthogonality for certain sets of, 975. given degree, best approximation, 1641.

least pth power, on a real finite point set, 1385. Legendre, second order determinants, 305. orthogonal, and Bessel functions, 249.

ultraspherical, 276; 298.

ultraspherical, and Bessel functions, inequalities, 72. ultraspherical, relative extrema, 106.

zeros, J 63B1, 21. zeros of, and the degree of linear systems, 790. Polyphenyls, crystalline, infrared spectra, RP2829.

fluorinated, by mass spectrometer, analysis, 1263.

fluorinated, synthesis and properties, 1521.

isomeric, by adsorption chromatography, separation, 2752. mass spectra and relative sensitivities, RP2831.

m-polyphenyls, synthesis and infrared absorption spectra, 1951. Polypropylene oxides and polyethylene oxide, thermal

degradation, 3100. Polysaccharides, and cellulose, 2403.

application of viscosity methods to the study of branching in, 654. carbon-14, carboxy-labeled, RP2880.

micromethylation, 2198.

reaction with carbon-14-labeled cyanide, determination of reducing sugars and reducing end groups,

2517. Polystyrene, 1220. glassy state, thermal and photochemical processes, 1958. polyethylene, degradation, thermal, 1209.

polyethelene in a vacuum, rates of thermal degradation, 526. polymethyl methacrylate, gamma irradiation, 2138. study of degradation, by means of mass spectrometry,

557. Polytetrafluoroethylene, thermal conductivity, RP2805

Polyvinyl chloride), heat and ultraviolet aging, R 1*2803. infrared spectra of thermally degraded, RP2832.

thermal decomposition, 3099. Population, normal, estimating the standard deviation of, Porcelain, enamel ground coats to steel, 2358. enamel to sled, adherence of, relation between roughness of interface and adherence, 2281. enameled hot water tanks, 2745. enameling, a radioisotope study of metallic deposits

in, 1941. enameling industry, practical test methods, 1452. enamels, weathcrability, 1578; 1579. jacket crowns, 2000.

thin, enameled sheet steel, flexibility, 2126. Pore conductors, properties, 1461. Pores in collagen and leather, 1449. Porosity in electrodeposits, nature, cause and effect, 1940. Portable potentiometer and thermostated containers for standard cells, 1450. Portland and high-alumina cements during hydration, 2768. Portland cement, 736. chemistry, 327. flame photometric determination of strontium, 1346. hydrated, some factors affecting the surface area, RP2806.

past, some effects of aging on the surface area, J 64A2,

163. reaction with carbon dioxide, RP2858.

Positive harmonic functions of ultra-spherical polynomials,

Positrons, and electrons, 1204.

electrons, backscattering, 567.

electrons, elastic scattering by point nuclei, 1694.

electrons, energy loss and range of, C577 Suppl.

electrons, relative back-scattering, 300.

electrons, transmission, 1560. energy loss and range of, C577 Suppl.

Possible movements of 5577 airglow, 2695. Potassium, alum, chromium, 1067. borohydride, heat content of, from 0° to 400° C, RP2S28.

bromide for infrared radiant energy, 812. calcium silicate, heat of formation, RP2955.

chromate as a transmittance standard in the ultraviolet, alkaline solution, 388. iodide fast neutron detector, i451.

oxide, 2364; 3059. three potassium-sodium alloys between 0° and 800°, the triple point and heat of fusion of potassium, heat capacity, 462. Potential, retarding, measurements, electrical differentiation, 2596. theory using the Nehari estimates, numerical experi- ments, 2654. Potentiometer, and thermostated containers for standard

cells, portable, 1450. Lindeck, 1389. low-cost microvolt, 2178.

self-balancing, 179. Potentiometers, helical, 1070. Pound of gas, 927. Powder, dry, fire extinguishment, 2123. Powder patterns, diffraction, standard X-ray, C539, Vols.

7, 8, 9. Powders and foams, heat transfer, 2147. Power, loss and operating temperature of tires, J 64C1, 1. microwave, measurements, 2720. microwave, measurements, mismatch errors in, 769.359
Power output of a sound source in a reflecting environ- ment, 3089. requirements and choice of an optimum frequency for a worldwide standard-frequency broadcasting station, J 63D1, 35. resolution of corpuscular spectrometers, 2791. spectra and the minimum detectable signal in meas- urement systems, 1430.

spectra, instantaneous, 469.

stabilizer, microwave, 90. supplies for 60-cycle tests of electrical instruments and

meters, 1814. supply, low-capacitance, 1391.

test chart, new, resolving, 268.

pr(n), some theorems, 2305.

Practical, evaluation of integrals, 1098. suggestions for reducing radiation exposure in diagnostic examinations, 2259.

test methods for the Porcelain Enameling Industry,

1452. Prandtl number, 1207.

Precise, coulometric titrations, 1815. coulometric titration of acids and bases, J 63A2, 153. evaluation of surface area with indirectly calculated dead space, RP2826.

intercomparison of acids by differential potentiometric titration with hydrogen electrodes, RP2769.

intercomparison of acids by differential potentiometric titration with the hydrogen electrode, 2260. measurement and race for technological supremacy,

2696. measurement of heat of combustion with a bomb cal- orimeter, Mono. 7. measurement of the infrared spectra of molecules of the atmosphere, 2377. measurements in the infrared spectrum of carbon monoxide, 516. time synchronization of widely separated clocks, TN22

(PB151381).

Precision, 5-10 kv high-voltage supply, 1453. measurement, 2261.' problems and paradoxes, 287. quartz resonator frequency standards, 1111. thermostat for high temperatures, 110. transistor oscillator, 799. Predicted lines of Fe i in the arc and in the sun, 111. Prediction, cumulative distribution with time ground wave

and tropospheric wave transmission loss. Part 1. The prediction formula, TN15 (PB151374).

pressure drop in two-phase single-component fluid flow, 3019. study of complex systems, some aspects, 2225. sunspot numbers for cycle 20, 3020. system behavior, 2660A. system performance from information on component

performance, 2223. Predictions of the present sunspot cycle, 1112.

Predictor-corrector, alternative, process, 389. Preface to Proc. 3d Symp. on cosmical gas dynamics, 2697.

Preferred, circuits manual with engineering notes, 1113.

circuits program, NBS, 1412.

orientation in stark rubber studied with an automatic

integrating pole-figure goniometer, 1454. Preliminary, analysis of amplitude scintillations of radio

stars observed at Boulder, Colorado, TN20

(PB151379).

list of levels and fir-values for the first spectrum of thorium (Th i), J 63 A3, 275.

results of the National Bureau of Standards radio and

ionospheric observations during the International Geophysical Year, J 63D1, 1. study of radiometeorological effects on beyondhorizon propagation, J 64D3, 239. Prelubricated and unlubricated ball bearings at high speeds and extreme temperatures, friction and en- durance of, J 63C1, 19. Prepackaged commodities, checking, H67.

Preparation, and maintenance of radioactive standards by

the NBS, 1455. bituminous materials for spinning, 800. carbon-14-labeled cyanide, 2262. high-purity hydrogen deuteride, 153. maintenance, and application of standards of radioactivity, C594. maintenance of standards of radioactivity, 1944. metallic iron of high purity, 801. new solution standards of radium, RP2924.

pure hydroxyapatite crystals, 1816. small quantities of germanium tetramethyl, 517. some aryl silanes, 1192.

trichloride and tetrachloride of molybdenum, J 63A2, 185. two fluorinated p-dihalobenzenes, 879. Preparing cuprammonium solvent and cellulose solutions, 112. Present, experimental status of rare-earth spectra, 3090

status and future prospects of emission spectroscopy,

3021.

status of color television, 154. status of research on the physical constants at the (United States) NBS, 2263.

status of standards for shoe last sizes, 113. status of temperature scales, 590. Preservation, of documents by lamination, Mono. 5. Declaration of Independence and the Constitution

of the U.S., 288. record papers, 1840

Press specimens, semi-dry, 2501. Pressure calibration of condenser microphones above

10,000 cps, 1114. drop in pneumatic components and systems, 1456. drop in two-phase single-component fluid flow, 3019. Pressure-flow characteristics of pneumatic valves, dis- cussion of the paper, 2092.

Pressure-sensitive diaphragm-type null detector, 2698. Pressure-volume temperature relations of liquid normal

deuterium, 1115.

Pressures, developed in cement pastes and mortars by the

alkali-aggregate reaction, 2699. wind, in various areas of the United States, B MS152. Pretied tie for communication line wires, 2432. Prevention of microbiological deterioration of leather, 1817. Primary, standard of frequency, 737. standards, atomic definition, 28. Principal submatrices of a full-rowed nonegative matrix, J 63B1, 19. Principle of randomization in the design of experiments,

2378.

Principles of experimental design, 880. Prism, cesium iodide, infrared measurements, 742. Prism, cesium iodide, infrared spectrometry, 744. Prism, effect, camera tipping, and tangential distortion, 2264. Kosters double-image, 2822.

location of the principal point, effect, 2350.

Probability, distribution of the amplitude of a constant

vector plus a Rayleigh-distributed vector, 1541. distribution of the phase of the resultant vector sum

of a constant vector plus a Rayleigh distributed

vector, 591. elements, 2500. elements of a mathematical theory, 708.

limits for the average chart when process standards

are unspecified, 1116. methods for the numerical solution of certain problems

in analysis, 763. saddle point, 2379. theory and differential and integral equations, 278. Probe tube method for the transfer of threshold standards between audiometer earphones, 632. Probing the ionosphere, 2700. Problem, in matrix minimization, 1985.

self-heating of a spherical body, RP2773.

360
stability in the numerical solution of partial differential equations, 1588. y theory of mechanical quadratures, 1423. | Problem, smoothing, remark on, 931. Problems, algebraic number theory, some computational,

1873.

arising in engineering investigations, 1457. drainage and venting, 289.

linear programming, how to solve, 1360.

logical design, 1818. multiply connected domains, boundary value, 404. random walks in space, 310. theorv of non-linear vibrations, 277. ultramicrotomy, 309. unsolved, in review, 1568. Procedure, analytical, 926. improve the quality of ionospheric data, 1117. Procedures for the rejection of suspected data, 784, Proceedings, of the Berkeley symposium on mathematical

statistics and probability, 114. Processing, denture base resins: heat-curing type, 1819. mechanized, components, 1291. production, and metrology, 1777. products, of cool flame oxidation of propane-2-C 13

, 2702. second symposium in Linear Programming, 1458. smooth patterns, 1139. square temperature wave in a filament operating at low temperatures, 2701. two-dimensional patterns by scanning techniques, 802.

volatilized from a channel and a furnace black on

heating to 1,000° C, 803.

Profiles, ionospheric layer, joint use of the ordinary and

extra-ordinary virtual height curves in determining, J 64D2, 111. Program, of the International Commission on Radiological Units and Measurements, 3022.

training and graduate instruction in dental materials

at the NBS, 2827.

training, weights and measures, 182. Programmers, some general precepts, 545. Programming, for finding the characteristic values of Mathieu's differential equation and the spheroidal wave equation, 518.

linear, 1458; 1757.

linear, in bid evaluation, 1051.

linear, systems of distinct representatives, 1910. problems, linear, how to solve, 1360.

scientific computers, 1820. system for codesorting letter mail, TN50 (PB151409). Programs for computing hypergeometric series, 1118. Progress, in metal cleaning and finishing, 1459. report by Committee of Optical Society of America

on Uniform Color Scales, 1459A.

report on automatic data processing in Government

(1956), 1822. report on SEAC, 1995. Projected images used with range finders, 'RP2851-

Prolonged space-wave fadeouts at 1,046 Mc observed in Cheyenne Mountain propagation program, 1119. Proof testing rubber tires, 519. Propagation, and initiation of fatigue crack, distinction between, 1925. around a sphere, an exact earth-flattening procedure,

J 64D1, 61. beyond-horizon, preliminary study of radiometeorological effects on, J 64D3, 239.

characteristics of the frequency band 152-162 Mc

which is available for marine radio communications, 1945. constant in rectangular wave guide of finite conductivity, 1120. curved stratified atmosphere, mode expansion in the low-frequency range, J 63D1, 75. electromagnetic and acoustic pulses, Part I: diffrac- tion of pulses by wedges, 1799. electromagnetic waves along a curved surface, 2673.

errors in spectrophotometric colorimetry, 804.

errors in tristimulus colorimetry, 2266. ground wave pulse around a finitely conducting

spherical earth from a damped sinusoidal source

current, 3024.

ionospheric, by the scatter-sound method, 2326. ionospheric scatter, 3011.

ionospheric, very low frequency, 2203. long waves, 2721. low frequency, ionosphere disturbances, 229. low-frequency, in arctic areas, J 63D1, 99. measurements, an analysis of, made at 418 megacycles

per second well bevond the radio horizon (a di- gest), J 64D3, 255. measurements made at 418 Mc well bevond the radio

horizon, analysis of, TN6 (PB151365). measurements near the radio horizon, tropospheric

scatter, 1499. oblique incidence, at 300 kc using the pulse technique,

off-path,' at VHF, 2656. production of electromagnetic waves in a plasma,

3023. pulse across a coast line, 2265.

radio, at 96.3 mc between Richmond, Va., and Washington, D.C., study of some of the meteorological

effects, 635. radio electrical, 2405.

radio frequency ground wave transient sinusoidal over a finitely conducting plane earth, 2267.

radio ground waves, RP2770.

radio, in the TV and FM bands, factors affecting, 1342.

radio, low and medium frequency, 2615.

radio, new kind, at very high frequencies observable over long distances, 369. radio research at the NBS, 2713.

radio, transmission loss in, 90. radio, transmission loss, II, TN12 (PB151371).

radio, transmission power, 3102. radio wave, 2331.

radio wave, beyond the horizon, 228. radio wave, in an inhomogeneous atmosphere, TN24

(PB151383).

research, fading rate recorder, 2949.

scatter, 1544. second sound, in liquid helium, II, 821. sound in five monoatomic gases, 1823. sound in rarefied helium, 115. sweep-frequency, 1498.

terrestrial, of very-low-frequency radio waves—a theoretical investigation, J 64D2, 153. time-varying media, information theory, aspects, 1143;

1364. transient ground wave, note, 1992. tropospheric, beyond the horizon, 351; 470. tropospheric, beyond the horizon, role of partial re- flections, 595. tropospheric forward scatter, TN53 (PB161554).

tropospheric 1948-1956, TN26 (PB151385).

tropospheric, partial reflections, 508. tropospheric, point-to-point radio relaying via the scatter mode, 1812. tropospheric, radio wave scattering in, 808. tropospheric radio wave, some aspects, 1872. tropospheric scatter and atmospheric circulations, J 64D1, 81. turbulent atmosphere over irregular terrain, 1550. turbulent atmosphere, rate of fading, 1542. very high frequency by ionospheric scattering-survey

of experimental results, 1971. very high frequency measurements in the Rocky

Mountain region, 1972. VHF ionospheric, regular, 1495. VHF over irregular terrain, 1663. VHF scatter, high-gain antennas, 1729. very-low-frequency, in the presence of a transverse magnetic field, J 64D3, 265. VLF ionospheric for finite ground conductivity, VLF ionospheric, mode theory, 2234; 2456. 361
VLF ionospheric, waveguide mode theory, 2390. VLF multiple reflections between the earth and the

ionosphere, 1781. very-low-frequency pulses to great distances, RP2898. VLF radio waves, TN58 (PB161559). VLF skywave geometrical optics, 2360. VLF using atmospheric waveforms, 2760. very low radio frequencies, transmission loss curves, 2851.

vicinity of Point Barrow, Alaska, layered earth, J 64D1, 95. Propagation, wave, 1147.

anisotropic, inhomogeneous medium, 910. breaking velocities, strain energies, and theory neglecting, 1277. ionospheric, 67. long textile yarns impacted transversly, 2783. over an irregular surface, integral equation approach

to the problem, 394. through an inhomogeneous medium, 629. Propane-2-C13

, products of cool flame oxidation, 2702. separation of the products of cool flame oxidation, 2753. Properties of arsenic sulfide glass, RP2774.

concrete at high rates of loading, 1824. corrugated diaphragms, investigations, 1378; 2166. Cr+++ ion in the paramagnetic alums at low temperatures, 522. diamond, 2762.

fibers, 1121.

fluorine compounds, the vibrational spectrum of tetra- bromoethylene, 1825. gases at elevated temperatures, 2664.

glasses in the system barium oxide-boric oxide-silica, 2763. impact, boron-treated steels, study, 1601.

intermetallic compounds, electrical and optical, 1007. lightning impulses which produce whistlers, 2764. magnetic, below 1° K,' 756. materials at low temperatures, 2268. mechanical, of some engineering materials, 2193. mechanical, of structural materials at low temperatures, Mono. 13. Mg2 -Sn, 1460.

physical, chromium cobalt alloys, 2687.

plastic films, 1122. properties of flameproof fabrics, 3050.

similarity, of the two-fluid model of superconductivity, 543. struve functions, 2269. thermodynamic, of helium at low temperatures and

high pressures, TN8 (PB151367).

transport, of dilute alloys of copper, 2852A.

Property, of additively closed families of distributions, 2433. experimental map papers containing synthetic fibers, 2703. normal distribution, 928. polymer networks formed from oriented chains of natural rubber, 2765. polymethyl alpha-chloro-acrylate, 520. pore conductors, 1461. Portland cement pastes cured at elevated temperatures and pressures, 1826. rayon fabrics, factors affecting, 446.

self-curing denture base resins, 521. sodium titanium silicate glasses, RP2890.

synthesis of fluorinated polyphenyls, 1521.

zinc borosilicate glasses, RP2930.

Propionate, acetate, and butyrate radicals, heats of combustion of some peroxides and the heats of for- mation, 2148. Proposal for standard frequency broadcast at very low

frequency, 2270. Proposals for the mechanical resolution of German syntax

patterns, 290. Proposed, criteria for defining load failure of beams, floors, and roof constructions during fire tests, J 63C2,

121.

index of current noise for composition resistors, 1241. nomenclature for linear viscoelastic behavior, 2271. I recommendation on ionospheric vertical soundings > after the I.G.Y., 2704.

specification for dental chromium-cobalt casting i alloys, 1996.

specification for plastic teeth, 2272. standard for facilities for scientific conferences, 2434. j Prosthetic, dentistry, acrylic resins, 2449.

dentistry, resins, 2738. Protection, design, Roentgen ray, editorial, 433. ionizing radiation, 1151. low-strategic alloys with a chromium boride-nickel cermet coating, 1463. molybdenum from oxidation at elevated temperatures, ! 2705. neutron radiation up to 30 million electron volts, H63.

use of dental roentgenographic equipment, 1462. Protective coating adhesion measurement using an elec- tronic averaging device for the adherometer.

2273.

Protein, dilute, solutions, interpretation of hydrodynamic

data, 2668. Proton, gyromagnetic ratio, 2422; 2706. Proton, high energy, emission spectra of nitrogen bom- j barded, 576. Protons, high-energy, and hydrogen atoms, intensity

distributions in nitrogen bands excited in auroras,

1044. Pyrolysis of poly-alpha methylstyrene, 2707. Pseudo-analytic functions, expansion theorem, 577. Pseudo-random numbers, generation and testing, 1722. Pseudoternary svstem calcium oxide-monocalcium alumi- nate (CaO-Al.O-)-dicalcium ferrite (2CaOFe2 03), I RP2900.

pth power polynomials on a real finite point set, 1385. Pulp and paper, 805. annual review, 1466. Pulp and paper industrv, annual review, 1627; 2024. Pulps, ICCA "standard", 2890.

Pulse, across a coast line, propagation, 2265.

circuit, accurate time-modulated, 646. generator and high-speed m<5moire circuit, 1827. generator, incremental delay, 191. height analyzers, multichannel, 2207. height measurements of recoils from B10 (n,x) Li7

,

! 1123. method for determining dynamic stress-strain re- lations, 1997. sky wave phenomena observed at 100 Kc, 2274. Pulsed magnetic extractor for removing the electron beam

from a betatron, 929. Pumps, and bearings at low temperatures, operation, 2676. performance of, with liquefied gases, 2243. Punched, cards, tables, 177. cards, tables on, addendum to guide, 641.

cell batteries with polyethylene glycol electrolytes, 1828. Purification of mercury and its physical properties, 2275. Pyranoid sugars, conformations of. II. Infrared absorption spectra of some aldopyranosides, J 64A3,

239. Pyrex and silver, stability in perchloric acid-silver per- cholrate solutions in conductivity water, J 64A1, f 127. Pyrolysis, of a and deuterostyrene polymers, 1464. j hydrocarbon polymers, 116. mixtures of ethane and ethane-de, 291. polyamides, RP2819.

polyamides, influence of impurities, J 63A3, 269. tribromofluoromethane, hexafluorobenzene, 2151. P^rometry and thermometry, 2500. Pyrophosphate formation upon ignition of precipitated

basic calcium phosphates, 1465. O

Quadratic fields, and matrices, classes, 412. form, a note on values, mathematics, 2186. 362
Quadrature errors for analytic functions, 1096. Quality of gray tin crystals and their rate of growth, 2672. Quantitative, chromotographic procedure for determining

dextrose in sugar mixtures 2276. determination of copper in natural rubber, 523. determination of natural rubber hydrocarbon by

refractive index measurements, 292. Quantum, interactions of the free electron. 1659; 1829. mechanical calculation of the probability of an ex- change reaction for constrained linear' encounters,

3025. mechanical effects on the surface tension of simple

liquids, 2708. mechanics by density matrix and operator techniques,

description of states, 2081. Quarterlv radio noise data—March, April, May 1959, TN18-2 (PB151377-2).

Quartz, alpha- and beta-, piezoelectric constants at various temperatures, 108. anelasticity of, 653.

crystal resonators and oscillators at low temperatures,

2734.

crystalline, 2022.

crystals, detwinning, TN3 (PB151362).

elasticity and dielectric loss, 1620. method for the dynamic determination of the elastic, dielectric, and piezoelectric constants of, Mono.9. precision, resonator frequency standards, 1111. resonators at very low temperatures, stability, 2315. small precision bottles, and low-loss glass, 2224. Quaternion matrices, 967. Quaternions, powers of, elementary note, 390. R Rn

, new criterion of uni valence of transformations, 3106. Rack for standard resistors, 3026. Radar, scattering by the moon, theory, J 64D3, 217. waves from meteor trails, interpretation, 338. Radar-type, echoes from meteor trails, wave-frequency dependence of the duration, 348.

reflections, 176. Radial distribution of the center of gravity of random

points on a unit circle, RP2847.

Radiant, energy source, method for measuring surface flammability of materials, 1593. energy, unpolarized, in the analysis of infrared absorption spectra, 1569.

glass heating panels, 807. Radiated harmonics, measurement of, source of error, 377. Radiation, atomic, and polymers, 1634. atomic, on polymers, effects of, 698. attenuation data, 3027. contribution of the annihilation, to the gamma-ray

flux in lead, 2917.

dangers, 1305. data during dental X-ray exposure, ionization chambers, 1380. enhanced, solar, and plasma oscillations, 544. exposure and the use of radioisotopes, 2277. exposure as a reasonable calculated risk, 2709. exposures to man, maximum permissible, 2187.

field from a rectangular source, J 64C2, 121. gamma, from Ag105

, 1718. gamma, from Zn63

, 2956. gamma, multipled-scattered, from a plane isotropic source, angular distribution, 1265. gamma, near the interface between two media, calculation of energy dissipation, 2043. general relations between fluxes from collimated point and plane sources, 2957. high-energy, behavior of polymers exposed, factors influencing the behavior, 1343. high energy, effects in polymers, mechanism, 2194.

ionizing, permissible exposure, 1443.

legislative control, 1755. low frequency, from a horizontal antenna over a

spherical earth, 1761. 569918 0—61 24

neutron, up to 30 million electron volts, protection

against, H63.

pattern, horizontal, of a high-frequenoy antenna, long

distance, 2371. pattern of an antenna mounted on a surface of large radium of curvature, 1946. patterns and conductances of slots cut on rectangular metal plates, 1947. patterns of circumferential slots on moderately large conducting cylinders, 1830. permissible, exposure levels, 2075. point source, 1267. reducing, exposure in diagnostic examinations, practical suggestion, 2259.

regulations, 1832.

resistance of dipoles in an interface between two dielectrics, 1833.

safety, 1280.

scattered, 1135.

slots on dielectric-clad and corrugated cvlinders, RP2802.

small loop immersed in a semi-infinite conducting medium, 3028.

solar flare, ionospheric effects, 1750.

solar plasma, condition, 414,

spectra, VLF, of lightning discharges, J 63D2, 199. survey meters, pocket chambers and dosimeters, X-ray

calibration, 172. thermal Pitot tube, 101. Radiation protection, H65.

basis for standards, 1639. education, 1324. general practitioner, 1831. measurements, brief history of the National Committee, 2478. philosophy, 2376.

regulations, exposure standards, 2947. therapeutic radiology, 1467. Radiations, dosimetry of ionizing, introductory remarks on, 1045. gamma, penetration of, 2102. high-energy, degradation and range straggling of, 680.

ionizing, for biological purposes, 1189. nuclear electromagnetic, 2500.

parallel angular moments, angular correlations, 2021. Radiative, electron capture in cesium-131, 1834. electron capture, NBS alpha standards, coincidence

counting, 2644.

orbital electron capture in vanadium, 1835.

transitions on the relaxation behavior, the effect of, 2235. Radiators, slot in rectangular metal plates, investigation, 1622. Radical, C2 , in hydrocarbon flames, 1434.

distribution studv of vitreous barium borate, J 64A3,

229.

free, degradation, high-speed computations in the

kinetics, 2587.

free, stabilization in condensed phases, 2570. OH, dissociation energy, 1503. Radicals, acetate, propionate, and butyrate, heats of combustion of some peroxides and the heat of formation, 2148. diatomic free, of the isotopic hydrides of oxygen and

sulphur, 1357.

frozen, chain reactions, 3030. low-pressure acetylene-oxygen flames, 2311. trapped, 2853. Radicals free, 2622. atoms, luminescence of solid nitrogen 1,4.2° K), 2182.

frozen, 2129.

frozen: the problem and the program at the National Bureau of Standards, 2130. low temperatures, stabilization of, Mono. 12; 2316. research at the National Bureau of Standards, 2973. 363
research symposium, 2572.

stabilized, 2774. Radio, atmosphere at short ranges, waveform, 1800. atmospheric, refractive index, 3002. climatology, 2564. communication, intermittent, utility of meteor burst, 2389. ducts, ground-based, climatology, J 63D1, 29.

eclipse, expedition, NRL, Aleutian, 273.

electrical propagation, 2405.

field strength data, tropospheric, 362.

frequencies, constants in the equation for atmospheric

refractive index, 855. frequencies in the band 25 to 60 Mc, TN13 (PB151372)

frequency ground wave transient sinusoidal over a

finitely conducting plane earth, propagation, 2267. frequency mass spectrometer, 117. ionospheric observations during the International Geophysical Year, J 63D1, 1. ionospheric world-wide soundings Committee, 2490.

low, frequencies, calculations of ionospheric reflec- tions, 2044.

low, frequencies, transmission loss curves for propagation, 2851. marine, communications, propagation characteristics

of the frequency band 152-162 Mc which is avail- able for, 1945.

measurement of winds aloft. 524. measurements, 263.

multiple, interference to FM and television service,

statistical apDroach to the problem, 378. observations, model of the electron corona, 2875. observations (al-CM) of dense dark nebulae, 1468. observations of interstellar neutral hydrogen clouds,

1836. optical data, 2874.

outbursts, solar, an estimate of the density and motion

of solar material from observed characteristics,

649. phase measuring systems, a source of error, 10; 186. photo-transmissions, spectrum of frequencv-shift,

1884. point-to-point, relaving via the scatter mode of tropospheric propagation, 1812. ray bending, TN44 (PB151403).

rays at small elevation angles, 2388.

reflections from meteor trails in research on the upper

atmosphere, study, 144.

solar, astronomy at the NBS, 1490.

solar, bursts, 2958.

stars observed at Boulder, Colorado, amplitude scintillations, preliminary analysis, TN20 (PB151379).

surveying systems, phase measurement type, 22. transmission at VHF by scattering and other processes

in the lower ionosphere, 1469. transmission loss vs distance and antenna height at 100 Mc, 1470. tropospheric, field strength data, 546. tropospheric, wave propagation, some aspects, 1872. VLF, waves, propagation, TN58 (PB161559). waveguide components, electroforming, C587. Radio horizon, an analysis of propagation measurements made at 418 megacycles per second, J 64D3, 255. analysis of propagation measurements, TN6 (PB151365). comparative 100 mc measurements at distances far beyond the, 972. spaced antennas far beyond, 1401. tropospheric scatter propagation measurements, 1499. Radio noise, atmospheric, from statistical moments, deter- mination of the amplitude-probability distribu- tion J 64D1, 49. atmospheric, report, 1851. cosmic, intentities in the VHF band, 418. data, quarterly, TN18-2 (PB151377-2).

effects of high-altitude nuclear explosions, J 64D1, 37. International Geophysical Year July 1, 1957-December 31, 1958, TN18 (PB151377).

ionospheric origin, 118. 364

solar, 1149; 1418. VLF atmospheric, 2188. Radio propagation, excitation of surface waves on conducting, stratified, dielectric-clad, and corrugated

surfaces, RP2807.

fields of an insulated loop immersed in a conducting medium, RP2781.

low and medium frequency, 2615. mixed-path ground-wave propagation, RP2770. new kind, at very high frequencies observable over

long distances, 369. 96.3 mc between Richmond, Va., and Washington,

D.C., study of some of the meteorological effects, 635. pattern of a flush-mounted microwave antenna, RP2796.

research at the National Bureau of Standards, 2713. transmission loss, 901; TN12 (PB151371).

transmission power, 3102. TV and FM bands, factors affecting, 1342. Radio wave, bending from normal, calculation of the de- partures, J 64D3, 259. generation by multi-stream charge interaction, 295. propagation, 2331. propagation in an inhomogeneous atmosphere, TN24

(PB151383).

propagation, system loss, J 63D1, 53. scattering by tropospheric irregularities, J 63D2, 205. scattering in tropospheric propagation, 808. Radio waves, TN52 (PB161553).

atmosphere, oxygen and water vapor absorption,

2241. atmospheric bending, 2806. downcoming, 2932.

galactic, 63. lower ionosphere, 2661. measurement of the phase, received over transmission paths with electrical lengths varying as a result

of atmospheric turbulence, 1402. measurements of coastal deviation of high-frequency, J 64D1, 57. penetrating the ionosphere, 2458.

scattered, some meteorological effects, 1874.

three-centimeter, single path phase measuring system,

2758. VLF frequency characteristics, 2345. VLF waveguide mode theory, 2391

Radio-astronomical test of the ballistic theory of light emission, 2878. Radio-frequency microvoltages, accurate, 640. Radio-ray, average, refraction in the lower atmosphere,

400. Radio-refractive-index, climate near the ground, J 63D3,

259.

air, slide rule computes, 829. synoptic study of the vertical distribution, J 63D3, 249. synoptic variation, J 63D1, 91. Radioactive, fallout prediction, analog computer, 1616.

isotopes, bodies containing, safe handling of, H65.

isotopes, new lower permissible exposure levels, 2099.

liquids, 1649.

nuc"ei, aligned, nuclear magnetic resonance of, 778. standards, preparation and maintenance by the NBS,

1455. Radioactivity, assay, of tritium compounds, J 63 A2, 177. In"7 and Sb"7

, 1124; 1471. In .20 Sb120

, 2711. preparation and maintenance of standards, 1944. standardization in the United States, 2712. standards, international comparisons, 1746. standards of, applications, 1631. standards, preparation, maintenance, and application, C594.

standards program, 2714.

units, 163. Radioassay of tritium-labeled compounds in "infinitely thick" films with a windowless, gas-flow, proportional counter, tritium-labeled compounds I., J 63 A2, 171.
Radiofrequency, ground waves, transient, over the surface

of a finitely conducting plane earth, RP2844.

induction-heating unit, automatic controller for, 047. low, tables of ground wave parameters for the spherical earth theory: the roots of Riccati's ditr.-ivntial equation, TNT (PB151366).

ionosphere, J 04D3, 269. Radiographic rooms, dose to walls, 1319. Radioisotope study, of metallic deposits in porcelain enameling, nickel dip, 1941. nickel dip, 1599. Radioisotopes, radiation exposure and the use, 2277.

Radiological, applications of gamma-rav transport theory, 3051.

physics, 1125.

units and measurements, International Commission,

2366; 3022. Radiological protection, International Commission, his- tory, 2589. Radiology, biology, 1125.

science, 1483.

therapeutic, radiation protection, 1467. Radiometeorological effects on bevond-horizon propagation, preliminary study of, J 64D3, 239. Radiometers, measuring circuit, 1068. Radiometry, filter, some of its applications, 720. Radionuclides in air and in water for occupational ex- posure, maximum permissible body burdens and maximum permissible concentrations, H69.

Radiophotoluminescence dosimetry system of the U.S. Navy, 809. Radiowave propagation beyond the horizon, 228. Radium, determination of the gamma-ray emission of, RP2801.

large, of curvature, radiation pattern of an antenna mounted on a surface, 1946. preparation of new solution standards, RP2924.

small amounts in solution, report on the determination, 2733. standards, internal gas counting and the United

States radioactivity standards program, 2714. Radius, large, of curvature, currents excited on a conducting surface, 1668. Radix table, for obtaining hyperbolic and inverse hyperbolic functions to many places, 810. trigonometric functions and their inverses to high accuracy, 296. Railroad-signal glassware in terms of a standard source A

of the International Commission on Illumination, an evaluation of the luminous-transmittance re- quirements for, RP2849.

Rain, erosion damage to solids caused by high-speed collision with, RP2882.

Rainfall, attenuation, 29. Raman, spectra, infrared, of trans-difluorodichloroethylene, 2161. spectrum of triethylborane, 2278. Ramberg vacuum tube accelerometer, recent develop- ments, 297. Random, flight with multiple partial correlations, 525. notes on matrices, RP2850.

numbers, use, 613.

variables, changes of sign of sums, 662. Random walks, duration, 281. inversion of matrices, 282. space, problems, 310. Randomization, certain statistical decision procedures and

zero-sum two-person games, 231. design of experiments, principle, 2378. Randomly inhomogeneous atmosphere, scattering of elec- tromagnetic energy, 536. Randomness and other hypotheses, independence of tests, 2231. Range finders, unsymmetrical, cross-field errors, 1300. using projected images, RP2851. Range straggling of high-energy electrons in carbon, 2279. Rapid City, South Dakota, the aurora of October 22/23, 1958, J 64D2, 205.

Rapid extraction of resins from chilte and guavule rubbers,

119. impact loading of textile yarns, 2715. impact loading, yarns subjected to, stress-strain rela- tionships, 1899. Rapport sur l'etalonnage de deux lampes etalons secon- dares a ruban de tungstene par quatre laboratories nationaux, 2716. Rare earth region, photoneutron yields, 2249; 2686. Rate, nonequilibrium processes, studies, 2786. fading in propagation through a turbulent atmosphere,

1542. shrinkage of tendon collagen: further effects of tan- nage and liquid environment on the activation constants of shrinkage, 120. thermal diffusion of polymer molecules in solution, 1472. Rates, activation energies of thermal degradation of sty- rene and acrylate polymers in a vacuum, 811. thermal degradation of polystyrene and polyethelene

in a vacuum, 526. Rating of water-current meters, 340. Ratio, Poisson's, of aircraft sheet materials for large

strains, 798. proton gyromagnetic, 2422; 2706. Ratio-recording spectroradiometer, J 64C2, 151. Rational numbers, subroutine for computations, 1603. Ray, reflected suppression, 123. roentgen, standards, intercomparison of French and

U.S., 2017.

tracing, effect of atmospheric horizontal inhomogeneity, J 63D3, 287. Rayleigh, disk in liquid helium II, 157. disk measurements in liquid helium II, thermal, 603. distributed vector, 591; 1541. quotient iteration for the computation of characteristic roots and vectors, 3003; 3004. waves across an ocean floor with two surface layers, transmission, 2387. waves with depth in a medium with two surface layers, attenuation, 2344. Rayon fabrics, properties, factors affecting, 446. properties of, 718. Rayons et les neutrons, degradation des polymeres, 681. Rb87 narrow hyperfine absorption lines, 2677. R-branch heads of some C02 , 293. R-C bridge, selective, note, 370.

oscillator, wide-range, 171. Reaction, carbon monoxide with graphite carbon at 450° C, 2717. dimeric 5-aldo-l,2-0-isopropylidene-D-xylo-pentofur- anose with cyanide and the preparation of calcium l,2-0-isotropylidene-L-idofururonate-6- C» dihydrate, 2280. hydrogen atoms with solid olefins at— 195°, 2828. metal oxides with o-ethyoxybenzoic acid and other

chelating agents, 2829.

nitrous acid with collagen, 1837. sodium chorite with some aldoses and modified

celluloses, 1473. Reactions ammonia and hydrazine with oxygen atoms and hydrogen atoms in atomic flames, 1948. aromatic fluorocarbons with hydrogen, RP2940.

frozen radicals, chain, 3030. hexafluorobenze, 2718. Reactions en chaine de radicaux geles, 3030. Reactive, cylindrical structure excited by an axial line source, surface-wave resonance effect in a, J 64D1, 13. substances, highly, cryoscopic determination of purity, 1666. Reactors, large, methods for measuring the "Q", 1776.

nuclear, a survey of ceramics, 12. nuclear, ceramic coatings, 1285. Reagent chemicals, American Chemical Society specications, 1474. Receiving tubes, tabulation of data, H68. 365
Recent, advances in cryogenic engineering, 3031. developments in NBS spectrograph^ standard samples of iron-base alloys, 2719. developments in the field of microwave power

measurements at the National Bureau of Standards, 2720 developments in the Ramberg vacuum tube acceler- ometer, 297. experimental evidence favouring the pKi (p) correlation function for describing the turbulence

of refractivity in the troposphere and stratosphere, 3032

theoretical studies of the propagation of long waves,

2721. trends in glass analysis, 1126. Recently developed microwave impedance standards and methods of measurement, 2722. Reception of space diversity transmitters, 3033. Reciprocity law for X-rays, 1838; 1839. Recombination and attachment in the F-region during the

eclipse of May 20, 1957, 121. Record papers and their preservation, 1840. Recorded information, retrieving and correlating, machines, 1763. Recorder, simple type X(t)-Y, 184. survey: recording surfaces and marking methods,

C601.

Recorders, autographic stress-strain, 2465. magnetic tape, FM data reduction from, 722. Recording, instruments, direct-indicating, 690. instruments under dynamic conditions, 2286. microwave refractometer, 6; 122. sound transmission loss of walls as a continuous

function of frequency, new method, 1414. surfaces and marking methods, recorder survey, C601.

system, a photoelectric followup and its application

to remote observations of the beam in high precision balances, J 63C2, 91. torsion testing machine for wire 2435. Rectangular waveguide, 2012. half-round inductive obstacles, J 64B2, 113.

Rectifiers, ideal, harmonic generation, 2578. Recurrent determinants of Legendre and of ultraspherical polynomials, 298. Red lines in the airglow, oxygen, 2681. Redetermination of mass spectra of deuteromethanes, RP2896.

Reduction, adjacent-channel interference components

from frequency-shift-keyed carriers, 2723. adjacent-channel interference from on-off keyed,

carriers, 1841. area gage for use at low temperatures, 7. Reexamination of the crystal structure of a and 0 nitrogen, 2879. Reference, materials, certified, 3078. samples of isotopic abundance, 1475. samples stocked by the National Bureau of Standards,

isotopic abundance ratios, TN51 (PB161552).

Refined X-band microwave microcalorimeter, J 63C1, 77. Refinement, crystal structure of triclinic magnesium pyroborate, RP2936.

hydroxyapatite structure, 2724. Reflected ray suppression, 123. Reflection, coefficient of irregular terrain at grazing angles, study at 1,046 megacycles per second, J 63D2,

235.

curves, goniophotometric, analysis, 397.

fast neutrons from water, J 63 A2, 101. low- and verv-low-radiofrequency waves from the iono- sphere, J 64D3, 269. transmission by a parallel wire grid, J 63D1, 87. Reflectionless waveguide termination, 183. Reflections, gradient, nature, 586. Reflective surfaces, thermal resistance of airspaces and

fibrous insulations bounded by, BMS151.

Reflectors for a microwave Fabry-Perot interferometer, 3034.

Refraction, dispersion of thallium bromide iodide, 1842. focusing, and defocusing in a circularly stratified at- 1 mosphere, J 64D3, 287. Refractive index, arsenic trisulfide, 2726. atmosphere at microwave frequencies, 240.

elastic moduli of a borosilicate glass after heat treat- ment, 1844. equation for atmospheric, at radio frequencies, 855. geographical and height distribution of the gradient

of, 727.

indices of cesium bromide, 527. measurements, quantitative determination of natural

rubber, 292. potassium bromide for infrared radiant energy, 812.

radio, synoptic variation, 63D1, 91.

silver chloride for visible and infrared radiant energy,

124. synthetic sapphire, 2727. Refractivity in troposphere and stratosphere, 3032. Refractometer. cavities, limit of spatial resolution, J 64D1,

65. compact microwave, for use in small aircraft, 2415.

infrared phase contrast, 2600. microwave, recording, 6; 122. Refractories industry in some European countries, 592. Refractory castables, elasticity, strength, and other re- lated properties, 2536. preparation and some properties, 125. thermal length changes of, RP2768.

Refractory materials, permeability and some other properties of a variety of, 794. Refrigerants, bubbling in boiling, suppression, 2330. Refrigerated-food trailers, heat transfer measurement?

2580.

Refrigeration, helium, and liquefaction using a liquid hy- drogen refrigerator for precooling, TN39 (PB151398). mechanical, process for the no-loss storage of liquid hydrogen, 1986. system, determination of water content in Freon-12

circulation in, 990. system, liquid hydrogen temperature, design and construction, TN38 (PB151397).

Refrigerators, entrapment in, behavior of young children under conditions simulating, 2471. Regression problems, a note on confidence intervals, 2429. Regular, Coulomb wave functions, irregular, expressed in terms of Bessel-Clifford functions, 1127. rhombohedral lattice sampling of Munsell renotation

space, 930. Regulated supply offsets line changes, 2728. Regulations, radiation, 1832. Regulator, low voltage, 364. Reinforced, concrete, cracking of, flexural members, 1665.

plastic springs, 1843. Rejection of outlying observations, 813. Relation, among the blocks of symmetrical group divisi- ble designs, 548. occlusal surfaces to the stability of artificial dentures,

1194. _ I Relation between, absorption spectra and the chemical

constitution of dyes. XXIV. Absorption spectra of some thioindigo dyes in sulfuric acid, 342. absorption spectra and the chemical constitution of dyes. XXII. Cis-trans isomerism in thioindigo

dyes, 341. absorption spectra and the chemical constitution of dyes. XXVI. Effect of solvent and of temperature on the cis-trans isomerization of azo

dyes, 881. absorption spectra and the chemical constitution of dyes. XXV. Phototroprism and cis-trans isomerism in aromatic azo compounds, 593. absorption spectra and the chemical constitution of dyes. XXVIII. The hydration of azo dyes in organic solvents, 1543. actual and artificial weathering, 2729. conductance and the noise power spectrum of certain

electronic streams, 503. 366
net heat of combustion and aniline-gravit v product of aircraft fuels, 1 1 28. refractive index and elastic moduli of a borosilicate

Relationship between residual monomer and some properties of self-curing dental resins, 1846.

' between the lower ionosphere and the [OI] 5577 night- glow emission, 2880. between sporadic-E and aurora echoes at Barrow,

Alaska, 1845. dental materials to clinical subjects, 1476. Relative, back-scattering of electrons and positrons, 300.

basicities of tribenzylamine and tribensylainine oxide

in benzene and water, 1195. damping criterion for linear systems, 633. measurement of the photodetachment cross section

for H-, 3035.

stress-optical coefficients of some National Bureau of Standards optical glasses, RP2779.

Relative extrema, Bessel function, 104. Hermite orthogonal functions, 283. Laguerre orthogonal functions, 105. ultraspherical polynomials, 106. Relaxation, method for linear inequalities, 1196; 1 197-

reliability, measured values. Part I. Fundamental

concepts, 594.

starts with circuit design, 283. vibrational nonequilibrium distributions, 1847; 2235; 2324; 2786.

Reliable locked-oscillator pulse timer, 634. Remark, M. M. Day's characterization of inner-product

spaces and a conjecture of L. M. Blumenthal, 373. smoothing problem, 931. Remarks, commutators of matrices, 1145. some modular identities, 529. Remote-control method of opening ampoules of active

materials, 8. Removal, manganese prior to calcium and magnesium

precipitations, 814. nitrogen from hydrogen with silica gel at low temperatures, 2730. Report of the, Committee on atomic weights of the American Chemical Society, 127; 531; 1129. committee on the American Standards Association, 3036. subcommission on the question: What are the most

readily measured characteristics of terrestrial radio noise from which the interference to dif- ferent types of communications systems can be determined? 2284. Report on, atomic weights for 1956-57, 2731. comparative 100 Mc measurements for three transmitting antenna heights, 1848. International Standards Organization Technical Committee 61, 1477. Joint Commission for spectroscopy meeting, June

1956, 1849. reducing sugars, 2732. reducing sugars, effect of clarification with neutral

lead acetate before determining reducing sugars

in molasses, 1850.

revision of atmospheric radio noise data, CCIR Report

No. 65, VIII Plenary Assembly, 1851. sugars and sugar products, 1852. Report on the, determination of small amounts of radium

in solution, 2733. methods used in the 1949 AGA-ASME orifice meter

tests, 128.

NBS optical

delinrd on classes of analytic functions, 1003.

finite groups, 499. Reproducibility of a pen-and-chart type of recording in- strument under dynamic conditions, 2286. Reproducible and stable 1 silver-silver oxide electrode, 1998. Research, atmospheric, 2031 ; 2462. automotive at the NBS, 399. basic in Europe, 2470. building in the U.S. before 1947, 1279. corrosion at the NBS, 1297; 2503.

dental, 2079.

dental, resume, 1480. development and testing, NBS, aircraft lighting, 771.

effects of prestraining and notch sharpness on the notch strength of materials, 1853. everybody's business, 2737.

fire, in the United States, 2563.

highlights at the National Bureau of Standards. Annual Report, 1958: M226; 1959: M229. NBS Boulder Laboratories on quartz crystal reso- nators and oscillators at low temperatures, 2734. new tools for, 269. normal threshold of hearing, 2735.

operations, design of experiments, 1670. physical constants at the (United States) NBS, pres- ent status, 2263.

plating at NBS, 2736.

radio propagation at the NBS, 2713.

recent, in the propagation of VLF radio waves,

bibliography and survey, TN58 (PB161559).

roofings, 129.

social and industrial, information processing in, 741. standards for the plastics industry, 1130. sterochemical, 554. symposium, free radicals, 2572. systematic, 3060. Researchers, Government 158. Residual lattice strains in sectioned bars of plastically deformed iron, 1479. Resin, cements and posterior-type direct-filling resins, 1854. u . , coating methods and other variables on physical

properties of glass-fabric reinforced polyesters,

effects of, 1004. bonding of hardwood fibers in offset papers, 302. bonding of offset papers containing mineral fillers, 303. Resinous filling materials, 223. Resins, acrylic, crazing, 1298.

acrylic, in prosthetic dentistry, 2449. denture base, dimensional stability, 2523. denture, some properties, effect of molding processes,

direct filling, 1069. epoxy, as cryogenic structural adhesives, 2547.

filling, direct and indirect: a review of some physical and chemical properties, 688.

filling, direct, color stability of, 854.

filling, direct: dimensional changes resulting from

polymerization shrinkage and water sorption,

689. prosthetic dentistry, 2738. rapid extraction, from chilte and guayule rubbers,

119. 367
repair, self-curing, American Dental Association

specification No. 13, 1257. Resistance, abrasion, 2005. diode bridge circuit for temperature control, TN34

(PB151393). measurement of ceramic-type strain-gage cements,

2739. tension in plastics, 1855. Resistance-temperature relation for low temperature thermometry, 9. Resistencia a la tension de los plasticos, 1855.

Resistivity, dielectric constant, and power factor of leather, 533.

Resistors, composition, proposed index of current noise, 1241. noise in composition, 141 6A.

standard, rack for, 3026. Resolution of the dissociation constants d,l-malic acid from 0° to 50° C, RP2947.

Resolving, new, power test chart, 268. Resonance, effect in a reactive cylindrical structure excited by an axial line source, surface-wave, J 64D1, 13. frequencies, flexural and longitudinal, of uniform bars, comparision of experimental and theoretical re- lations between Young's modulus, J 64A2, 147. Resonator, integral super-conducting, liquid helium

cryostat, 261 OA.

Resonators, crystal, underearth, 903. quartz, at very low temperatures, stability, 2315. wide-range for VHF and UHF, 357. Response, earphones in ears and couplers, 1199. function of Nal (TI) scintillation counters, 1856. functions of total-absorption spectrometers, 2740.

large sodium iodide scintillation detector to high

; energy X-rays, 2741. loaded electric dipole in an imperfectly conducting

cylinder of finite length, J 64D3, 289. Results of Bureau of Standards 45-year corrosion study,

2287. ionospheric drift measurements in the United States, 2288. laboratory tests of high duty and super duty fireclay plastic refractories, 2289. sweep-frequency investigation in the low frequency

band, 1146. sweep-frequency propagation experiment over an 1150-KM east-west path, 1498. Resume of dental research, 1480. Retarding potential measurements, electrical differentia- tion 2596. Reverberant, sound fields, interference patterns, 1373. sound fields, measurement of correlation coefficients, 1399. sound through double walls, 159. sound through walls, 1214. Reverberation chamber, other reflecting environments, output of a sound source, 2679. study of the sound power output of subsonic air nets, 2742. Reversible contractile processes in fibrous macromolecules,

2743. Review, analytical distillation, 2744. dental research, 1956: dental materials and instru- mentation, 2290. methods of flow measurements, 1131. observational results in airglow photometry, 1242.

plastics, year 1952, 894. pressure drop across columns of bone char, 1243. proceedings of the Berkeley symposium on mathematical statistics and probability, 114. state of the art and future trends in electrochemical battery system. I. The more common systems,

2436. Revised analysis of the solar spectrum from 2990 to 2635A, 368

Revision of, American Dental Association specification No. 3 for dental impression compound, 1244. Commercial Standard CS 115-44 porcelain enameled

hot water tanks, 2745. phase equilibrium diagram of the binary system cal- cium-titania, showing the compound Ca4 Ti30i0 , RP2913. RF, micropotentiometer, 806. micropotentiometers for calibration of signal generators to 1000 Mc, TN37 (PB151396). permeameter techniques for testing ferrite cores, 2746. power measurement, 2419.

solenoid design chart, 294. voltmeter calibrating consoles, 2747. Rhenium (Re n), term analysis of the second spectrum, RP2914. Rhenium, term analysis of the first spectrum, RP2804.

Rheology of polyisobutylene, 1132; 3037. Rhombohedral, regular, lattice sampling of Munsell renotation space, 930. Rib flexibility, effect on the vibration modes of a delta- wing aircraft, RP2852.

Ribbons and half-planes, surface currents excited by an

infinite slot, 1907.

Ricctai's differential equation, J 64B2, 95. Ricerca e normalizzazione per I'Industria delle materie

plastische, 1857. Richardson, L. F., obiturary notice, 1088. Ridge, further studies of the influence of a, on the low- frequency ground wave, RP2884.

Riesz, M., theorem of, RP2935.

Ring conformation of sugar acetates, RP2772.

Rings; rubber, tension testing, 2801. Riometer—a device for the continuous measurement of ionospheric absorption, 3091. Riveted and spot-welded lap joints of aircraft materials, creep and creep rupture characteristics, 1299. Robertson, H. P., a determinantal inequality, 1980. Rocket hoist, 2430. Roentgen, ray protection design, editorial, 433. ray standards, intercomparison of French and U.S., 2017. standards of Great Britain and USA, intercomparison,

1621. Roentgenographs dental equipment, protection in the use, 1462. Role of, electronic computers in air traffic control, 2380.

nickel dip in the enameling of sheet steel, 1133. oxygen in the quenching of liquid scintillators, 1858.

partial reflections in tropospheric propagation beyond

the horizon, 595. Roofings, research, 129. Roots of natural numbers, algebraic equations, 1610. Rotating, dental cutting instruments, 1165. dental diamond abrasive instruments, 2085. molecular still, simple, RP2951.

Rotation, dynamic characteristics of, 913.

internal, in methyltrifluoromethyl acetylene, 1374. temperatures of OH in methane-air flames, 304. Rotation-vibration spectra of deuterated water vapor,

1859; 1949. Rotational, distributions, nonthermal, of OH (

2 2+) in flames, 1709.

intensity distributions of OH and OD in electrodelen discharge through water vapor, 817.

lines of CH, OH and CN in the solar spectrum, 2292.

relaxation in nitrogen, oxygen, and air, 3038. temperature of OH in diluted flames, 818. temperatures of OH in several flames, 534. vibrational relaxation of a system of rotating oscil- lators, 2787.

vibrational "temperatures" of CH in flames at at- mospheric pressure, 816. viscous flow through a tube, 1094. Rotator, single-axis in a crystalline field, theory of dielectric relaxation, 1554. Rotors, dies, and rate of shear on Mooney viscosity, 740. Rounding off of difference tables for linear interpolation, 504.
Rowland's table, second revision, of solar wave-lengths,

report, 1478. Rubber, compounds, temperature control, 1526. crude natural, ASTM subcommittee, 3065. dynamic properties of, measurement, 480.

elasticity, 2810A.

elasticity, physics, 2251. GR-S, solution, Mow behavior, 58. GR-S, solutions, viscosities of 0.25 to 90 percent, 621. Hevea, Moonev, viscometer cure characteristics, 1409. natural, 909. natural, hydrocarbon by refractive index measurements, quantitative determination, 292.

natural, infrared study of some structural changes in during vulcanization, RP2816.

natural, quantitative determination of copper, 523. natural, some properties of polymer networks formed

from oriented, chains, 2765.

natural, standard, 1505.

natural, symposium on recent developments in the

evaluation of, 844. natural, thermodynamics of crystallization in high polymers, 1558. oil-extended, oils used in, RP2771.

pure-gum, vulcanizates, elastic properties, 2534. pure gum, vulcanizates in tension, behavior, 1640.

rings, tension testing, 2801.

shear, nonlinear viscoelastic behavior, 1419.

stark, 1454. synthetic, 2967. time-temperature behavior, from measurements of indentation hardness, 2848.

tires, proof testing, 519.

tool in testing, statistics, 1512. unvulcanized and vulcanized in a vacuum, thermal

degradation, 1961.

vulcanizates, determination of sulfur, 1311.

vulcanizates, measurement of the aging, J 63C2, 141. vulcanizates, pure-gum, stress-strain relation in compression and tension, RP2837.

Rubbers, Castiloa and Hevea, treatment of leather, 160.

chilte and guayule, 119.

different, values of phvsical constants, 1222. natural and synthetic, 94; 264; 487; 772; 1412A; 2997. natural and synthetic, analytical procedures, 2020.

synthetic, physical chemistry of, 1107.

Russell, Henrv Norris, 2150. Ruthenium, 1228. (Ru i), analysis of the first spectrum, J 63A3, 213. (Ru i), low even configurations in the first spectrum,

part 2, J 63A3, 255. (Ru n), second spectrum, RP2908. (Ru i), supplementary Zeeman data for the first spec- trum, J 63A3, 253. Rydberg constant, value of, 3109.

S Saddle point, probability, 2379.

Safe, design and use of' industrial beta-ray sources, H66.

floors and floor finishes, 130. handling of, cadovers containing radioactive isotopes, Safety, code, new, for portable metal ladders, 2374.

color codes, 1481; 1861.

radiation, 1280. Sag point as a reference point in the heating of glasses, RP2791.

Salt pairs, metal-rock, epitaxy, 367.

Salts, fused, electrolytic preparation of moldybdenum,

1330; 2811.

liquid and liquid metals, specific heats, 2306. paramagnetic, properties of, 2408. Samarium, emission, spontaneous, of neutrons, 383. Samples, reference, of isotopic abundance, 1475. standard, 835. standard, and reference materials issued by the NBS,

C552, 3d ed.

Sampling flame gases, RP2818.

leather, 3039.

side upper leather II, 535.

statistical, methods to outgoing letter mail characteristics, some applications, TN16 (PB151375).

variables, 16. Sand, cast aluminum alloy 220 to stress corrosion cracking, 2349.

in "no-fines" concrete, 190. molding, 846. Sapphire, synthetic, refractive index, 2727.

Satellite, artificial, method for measuring local electron

density, J 63D3, 325.

orbits, effect of transverse atmospheric drag, 2532.

orbits, unretarded, new method of solution for, J 63 B2.

105.

Satellites, earth, comparison of phase difference and Doppler shift measurements for studying ionospheric

fine structure using, 2493. continuous phase difference measurements, 2499. Saturation backscattering of positive electrons, 131. Sauter theory of the photoelectric effect, 3040. Sb"7 and In 11

?, radioactivity, 1124; 1471.

Scale, amplitude, and spectrum of refractive index inhomogeneities in the first 125 meters of the ionosphere,

1258. He4

, of temperatures, 1958, J 64 A 1, 1; Mono. 10. reading errors of electrical indicators, 1134. temperature, helium vapor-pressure, 1535. weights and measures, 1580.

Scales, atomic weights and nuclidic masses, 2906. low temperature, from 90° to 5° K, 1392. temperature, present status, 590. Scandium, anhydrous, phosphate, structure, 1950. Scatter propagation issue, 1544. Scatter-sound method, ionospheric propagation, 2326. Scattered radiation contribution to depth dose data for 35-Mev and 90-Mev synchrotron X-rays, 1135.

Scattering, cross sections, variational calculation, 617. double, of electrons with magnetic interaction, 1320. electromagnetic energy in a randomly inhomogeneous

atmosphere, 536. oblique incidence from ionospheric irregularities, 1482.

radar, by the moon, J 64D3, 217. Schiefer abrasion testing machine, 382. Science, basic standards, 198.

fairs, 3041.

personnel, interdisciplinary approach, 77. radiology, 1483.

Scientific, conferences, proposed standard for facilities, 2434. developments and methods in practice (Dentristry in 1967), 2748. information, international exchange, 79. measurement and technological progress, 537. standardization, fifty years, 236. teamwork in a Computation Laboratory, 819.

Scientists' and public's responsibility, 2293.

Scintillation, and ionization detectors, dose measurements

in water using, 995. counter method of intercomparing neutron source

strengths by means of a manganous sulfate bath, RP2952.

counters, Nal (TI) response function, 1856. counting in experiments on parity conservation, 2749. counting of beta emitters, 2750. crystal-TV device X-rays objects in motion, 1484.

detector, large sodium iodide, to high energy X-rays,

2741. gamma-ray, spectrometer pulse-height distributions, 2856.

liquid, counting, 2614. spectrometers for measuring total energy of X-ray

photons, 1136.

Scintillator, liquid, temperature effects, 1759.

Scintillators, liquid, improved 2597.

gas-free liquid, temperature effects, 1915.

liquid, oxvgen quenching and wavelength shifters, 1439." 369
liquid, quenching of, role of oxygen, 1858.

liquid, three ways to increase efficiency, 1966. Screw thread, standardization, 1862. standardization, another milestone, 2025. standards for Federal Services, H28 (1957) Part II. why, must be everybody's business, 1977. world unification, 1581. SEAC, 820. computation of vibration modes and frequencies, 1293. construction and use of subroutines for, 416. influence coefficients of tapered cantilever beams

computed, 467; 738. numerical solution of the helium wave equation, 372. progress report, 1995. use of sub-routines, for numerical integrations of

differential equations and for Gaussian quadrature, 598. Sea-level latitude variation of fast cosmic-ray neutrons,

343. Search for the microwave spectrum of perchlorvlfluoride, 1863. Second, order determinants of Legendre polynomials,

305. report of the special committee on world-wide iono- spheric soundings of the URSI/AGI Committee,

2294. sound attenuation in liquid helium II, 1137. sound propagation in liquid helium II, 821. sound velocity measurements below 1°K, 822. spectrum of ruthenium (Ru n), RP2908.

Secondary, chromatic aberration, 2295.

electrons: average energy loss per ionization, 538. Sedimentation equilibrium of flexible chain molecules,

2296. Segment method, bounds for eigenvalues of Hermitian

matrices, 1005.

Seidel iterants of nearly symmetric matrices, convergence,

329. Selected bibliography on building construction and maintenance, BMS140, 3d ed. Selecting engineering adhesives, 306.

Selection, glasses for three color achromats, 3043.

limited number from many possible conditioning treatments for alloys to achieve best coverage and statistical evaluation, 155. Selenium-73, disintegration, 1316; 1680. Self-absorption in 47r-counter sources, RP2859.

Self-balancing direct-current bridge for accurate bolometric power measurements, RP2776.

Self-curing denture base resins, properties, 521. Self-heating of a spherical body, RP2773.

Self-ignition temperatures of materials from kinetic- reaction data, RP2909.

Semiautomatic Townsend balance system, 3044. Semiconducting intermetallic compounds, 823. Semiconductors, apparatus for measuring the piezoresis- tivity of, RP2814. compound, 2495.

electrical properties of titanium dioxide, 704. nuclear magnetic resonance, 3000. Semicrystalline poly (chlorotrifluoroethylene), specific volume and degree of crystallinity of, and es- timated specific volumes of the pure amorphous

and crystalline phases, RP2862.

Semi-infinite conducting medium, basic experimental

studies of the magnetic field from electromagnetic

sources immersed, J 64D1, 21. Semi-micro dilution viscometer, 1245. Sensitivity and life data on Bourdon tubes, 1864. Sen- White paper on atmospheric oscillations, extension

of, 1341. Separation, and determination of phosphate, silicate, and arsenate, RP2954.

determination of small quantities of aluminum in

steel, J 64A3, 235. hydrogen isotopes by multicomponent distillation, 2751.

isomeric polvphenyls by adsorption chromatography,

2752. products of cool flame oxidation of propane, 2753. Sequential, decision problems for processes with continuous time parameter, 824. flow cooling of electronic equipment, 1865. Series-resonant high-voltage supply, 539.

Service, area of an airborne television station, TN35

(PB151394).

Nation's technology, 1999. range for air-to-ground and air-to-air communications

at frequencies above 50 Mc, 540.

tests of boys' shoes, 541. Sets of three measurements, 825.

Sferics, measurements, ionospheric reflection coefficients at VLF, 2172.

polarization, 2257. spectrum analysis, 2312. Shape of, high-energy end of the electron bremsstrahlung

spectrum, 2755.

liquid immiscibility in the system barium oxideboric

oxide-silica, 2754. liquidus surface as a criterion of stable glass for- mation, RP2872.

Sharp line absorption in silica near 3400 cm-1

, 2297. Shear, degradation of polymers, 976. modulus and torsional resonance frequencies of bars

of rectangular cross section, RP2861.

rubber in, nonlinear viscoelastic behavior, 1419. Sheet steel, 1133. Sheets and pillowcases, standards help in the selection, 136.

Sheffield smoothness testers, use of the sensitivity criterion for comparison, 1970.

Shellac, 2298.

Shelters, gamma-ray penetration, RP2827.

Shielding, problems, aspect of gamma-ray penetration

theory, 2028.

transient electromagnetic dipole field by a conductive

sheet, 1866.

Ships, welded, investigation of structural failures, 746. Shock wave experiments, 2896. Shoe, last sizes, 113. research, suggested problem for industry-sponsored,

379. Shoes, boys', durability, 691. service tests, 541. Shutter-illumination device for the study of phototropic

dyes, 374. Sieve problems for all-purpose computers, 882. Sigma phase in high-purity 18-10, 542.

Signal, analysis, transients, 1968.

fluctuating, intermittent communications, 2163. generator system for low output levels, 826. generators to 1000 Mc, calibration of, TN37

(PB151396).

glassware, railroad, an evaluation of the luminoustransmittance requirements, RP2849.

lighting, 2562; 2952. minimum detectable, measurement systems, power

spectra, 1430. range of FM and television broadcasting stations, variation with frequency, 347. rapid, analysis, limitations, 1388. source, microwave, amplitude stabilization, 2452.

Significance of the results of some physical tests on upper

leather, 1485.

Silanes, aryl, 1192.

Silica gel, a thermochemical study of the reaction of, RP2785.

low temperatures, 2730.

Silica, glass, noncrystal ionic model for, RP2782.

near 3400 cm"1

, sharp line absorption, 2297. Silica-gypsum investiments, 1184.

Silicate, and binary alkali borate glasses at high pressures, compressibility, 1292. calcium, hydrates, 1172. cement, dental, 20. 370
cement: how to select and use them, 2290; 2756. cement: method of mixing in a closed container bo cements, deterioration in the tropics, 217.

glasses, alkali density formula, UP2<)lf>. glasses (luring annealing, structural rearrangements.

1901.

glasses, infrared transmissions, 2933.

glasses, role of vitrons in alkali, RP2854.

phosphate, and arsenate, separation and determina

tion, RP2954.

Silicates, molten alkali, density, expansivity, and viscosity, 422.

Silicon, carbide heating elements, infrared emission spec- trum of, RP2810.

tin, iron, copper, and nickel, electrorefining studies, 2811.

Siloxanes, methyl, by electron impact, 747.

Silver, and Pyrex, stability in perchloric acid-silver per- chlorate solutions and in conductivity water,

J 64A1, 127.

Silver, chloride for visible and infrared radient energy,

refractive index, 124. copper, molybdenum, tantalum, and gold at 662 kev,

total photoelectric cross sections, 3101.

electrode, 1486.

silver chloride electrode, standard electrode potential, 1895. sodium chloride, thallium chloride, and thallium bro- mide, photoemission, 1807.

sulfide in the photographic image during fixation, formation of, J 64C1, 65. Similarity, principle in the backscattering of 7-rays, 934. properties of the two-fluid model of superconductivity,

543. Simple, humidity lag apparatus, 1487. rotating molecular still, RP2951.

technic for making porcelain jacket crowns, 2000. technique for diplexing 10,000 Mc and video signals on coaxial cables, 2300. type X{t) — Y recorder, 184. Simplified, apprach to spin in Dirac theory, 2757. method for measuring the attenuation of balanced

transmission lines, 376. method of locating the point of symmetry, 2001. Simpon's rule for the numerical evaluation of Weiner's

integrals in function space, 185. Simulator for use in development of jet engine controls, C584. Simultaneous linear equations, determination eigenvalues, AMS49.

Sing-around ultrasonic velocimeter for liquids, 2301.

Single frequency filters, design, TN23 (PB151382). path phase measuring system for three-centimeter

radio waves, 2758. Single-phase transfer of liquefied gases, C596.

Singular, perturbation methods for nonlinear oscillations, 828. perturbation problems in theory of non-linear vibrations, 277. Sinusoidal, damped, source current, 3024. Skew shap suspended in a viscous liquid, motion of small

particles in, 1077.

Skin, calf, squares, influence of temperature on the adsorption of chrome (Cr2 03 ), 2159.

Skins, fur, aging of karakul and seal, 19. Sky, and eye, 2830. wave, pulse, phenomena observed at 100 Kc, 2274. Slack-quenched alloy steels, impact properties, RP2799.

Slant-Es, some implications, 2304.

Slide rule computes radio refractive index of air, 829.

Slit function effects in the direct measurement of absorption line half-widths and intensities, 1867.

Slots, conductance, 1796. Slotted-cylinder antennas, pattern synthesis, J 63 D3, 303. Small, current-measurements, 2036. grating spectrometer for the far infrared region, 1488. precision bottles of quartz and low-loss glass, 2224.

Smog at bos Angeles, sped ral radiant energy from I lie sun

Smooth-obstacle diilradion of electromagnetic waves for

Sodium, amalgam in the form of pellets, preparation of, J 64A1, 135. borohydride, heat content of, from 0° to 400° C, RP2828.

borohydride reduction of aldonic lactones, 1868. calcium aluminate, heat of formation, RP2887.

carbonate in photographic developers, note on esti- mation, 1238. chloride solutions, turbidity and viscosity measure- ments in, RP2778.

chloride, thallium chloride, and thallium bromide, photoemission from silver into, 1807.

chlorite, determination of glucose, 1310.

chlorite with some aldoses and modified celluloses, reaction, 1473. dodecyl sulfate-sodium chloride-water, light scattering and miscelle structure, 1386. flame photometric determination, in portland cement,

736. hydroxide and sulfuric acid methods for analysis of wool admixed with cotton and viscose rayon, 973. iodide scintillation detector to high energy X-ravs,

2741. vapor by electron impact, multiple ionization, 2996.

Soil clays and related materials, electron microscopy, 439.

Solar, atmosphere, motion in, as deduced from radio measurements, 263. chromosphere, 2927.

cycle influence on the lower and on VHF forward

scatter, ionosphere, 2759. disturbance, observation of audiofrequency electro- magnetic noise, 2019. "enhanced radiation" and plasma oscillations, 544.

flare radiation, ionospheric effects, 1750. Ha filaments and geomagnetic disturbances, 1489.

indexes, variously derived, comparison, 40. inner, corona during June 1959, 3080.

lines, identification of, 864. lunar atmospheric tides in barometric pressure, as re- gards to their worldwide distribution of ampli- tude and phase, 1586. plasma, condition for radiation, 414. radiation, near infrared, measurements by balloon to an altitude of 100,000 ft., 2645. radio astronomy at the NBS, 1490. radio bursts, 2958. radio noise, 1149; 1418. radio outbursts, an estimate of the density and motion

of solar material from observed characteristics, 649. spectrum, analysis, revised, 933. spectrum, CH, J 63A1, 19. spectrum, infrared multiplets, 743. spectrum, molecules, 2205. spectrum, OH, J 63A3, 279. ^ nnn

spectrum, rotational lines of CH, OH, and CN, 2292. wave-lengths, Rowland's report on the second revision, 1478. zenith angle (x) for thirty-five locations, tables of median hourly values of the cosine of, TN 5 (PB151364).

Solderless electronic assembly with cellular units, 830.

Sole leather with polymers, impregnation, 2594.

Solenide, manganese, magnetic susceptibility, 254. Solenoid, coils, coupling chart, 41. design chart, R-F, 294.

Solid, materials, mechanical testing, 482. nitrogen condensed at 4.2° K from a gas discharge, spectra emitted, 1881. 371
nitrogen (4.2° K) containing atoms of free radicals, 2622.

state, liquid, at low temperatures, TN4 (PB151363).

Solids, at low temperatures, 2934. elementary shape, temperature-induced, Mono. 2. Solution, of the caterer problem, 1099.

differential equation occurring in the problem of heat

convection in laminar flow through a tube, 789. Solutions, cuprammonium and cellulose, 112. dilute polymer, 166. Solvability and consistency for linear equations and

inequalities, 1869. Solving linear algebraic equations can be interesting, 831. Sonic technique, studies on leather by means of, 1905. L-Sorbose-C14

, synthesis of, RP2800.

Sorption, of dextran to collodion membranes, 832. macro-molecules to solid surfaces: sorption of dextran

to cellulose nitrate membranes in the presence

of serum albumin and surface-active agents, 1500.

Sorting, device (mail), capacity requirement of, J 63B2,

79. equipment (mail), analytic comparison of suggested

configurations for, J 63B2, 83. Sound, absorbers for jet-engine test cells, measurements*

1771. absorption coefficient from acoustic measurement,

46.

fields, reverberant, interference patterns, 1373.

insulation of wall, floor, and door constructions, BMS144, 2d Suppl. patches of absorbent materials, 2010. power output of subsonic air jets, reverberation chamber study, 2742. propagation of, in five monoatomic gases, 1823. propagation, second, in liquid helium II, 821.

rarefied helium, propagation, 115. reverberant, fields, measurement of correlationcoefficients, 1399. reverberant through double walls, 159. reverberant, through walls, 1214. source in a reverberation chamber and other reflect- ing environments, output, 2679. speed of, in water, by a direct method, RP2795.

speed of, in water, effect of dissolved air, 1686. speed of, in water near the turning point, temperature

coefficient, 1914. transmission loss of walls as a continuous function of frequency, new method of recording, 1414.

velocity measurements below 1° K, second, 822. Sounding, vertical-incidence ionosphere, at the National Bureau of Standards, TN28 (PB151387).

Source of error in the measurement of radiated harmonics,

377.

error in radio phase measuring systems, 10. function in a non-equilibrium atmoshpere. II. Depth

dependence of source function for resonance and

strong subordinate lines, 2767. non-migratable ionic charges developed by portland and high-alumina cements during hydration,

2768. Sources of error in various methods of airplane camera

calibration, 1878. identifying symbols of Government specifications, 549. transport coefficients and correlations of thermody- namic and transport data, 1501; 1879. Space, communication, outer, optimum frequencies, J 64D2, 105. diversity transmitters, reception, 3033. edge of, 2849. ^-commutative matrices, J 64B1, 51. problems on random walks, 310.

vehicles, coatings for, 2910A. waves propagated over irregular terrain, transmission

loss, 606.

Space-charge, wave amplification in a shock front and the I fine structure of solar radio noise, 1149. wave in moving, interacting electron beams with ap1 plication to solar radio noise, nonlinear theory,.' 1418. Space-charged clouds, electron optical properties, 53. j Space-wave fadeouts at 1,046 Mc, 1119.

Spatial, distribution of energy dissipation by high-enerev ' X-rays, 1150. **

j resolution of refracto meter cavities, J 64D1, 65. Spatially variable flow, determination of critical depth

425. Special lubricants tests, 311.

Specific, dental silicate cement, No. 9, American Dental

Association, 20. heat of beryllium between 0° and 900° C, 312. heats of collagen and leather, 1502. heats of liquid metals and liquid salts, 2306. volume and degree of crystallinity of poly(chlorotri- fluoroethylene), 2831. volume and degree of crystallinity of semicrystalline poly(chlorotrifluoroethylene), and estimated specific volume of the pure amorphous and crystalline phases, RP2862.

Specification, for cells (dry) and batteries, H71.

color rendering properties of fluorescent lamps, 134. proposed, for dental chromium-cobalt casting alloys, 1996.

transient nonequilibrium systems, 2237.

Specifications, American Chemical Society, reagent chemical, 1474. American Dental Association, for dental materials, 2451.

certain, properties of building brick and effects of differences in raw materials and methods for forming, relations, 528.

certification, dental materials, annual for 1943, 1307.

color, 52. color-rendering properties of fluorescent lamps, 833. dental materials, American Dental Association, 1614. electrodeposited coatings, 313. government, 1725. government, sources and identifying symbols, 549. standards and codes, governmental aspects, 1880. standards for plating, 1447. Spectacle lenses, instrument for measuring the marginal

power, 1369. Spectra, absorption, and chemical constitution of dyes>

relation between, RP2823.

absorption, of solids condensed at low temperatures from electric discharges, 2445. afterglows and discharges from nitrogen-oxygen

mixtures, 2307. astronomical, lines of the chemical elements, 1758. atomic, 1269. atomic, data concerning, 677. atomic, for the astrophysicist, 197. atomic, notation for, 775. atomic—their role in astrophysics, 1974. atomic, with electronic digital computers, analysis, 1624. bremsstrahlung, 1211.

electron spin resonance, from gamma-irradiated

solid nitrogen, 2940.

emission, autoignited heptane-air mixtures, 442. emission, of first-stage combustion in an engine, 333. emitted from solid nitrogen condensed at very low

temperatures from a gas discharge, 3052. emitted from solid nitrogen condensed at 4.2° K

from a gas dischargee, 1881. energy, of cascade electrons and photons, RP2824.

flame emission, kinetics of OH radicals, 475. gamma-ray degradation, an approximate expression

for, RP2788.

impure mercury 198, 60. infrared absorption, 75; 1569.

infrared absorption, of some cyclic acetals of sugars, RP2960. 372
infrared absorption, of urea, thiourea, and some thio- urea-alkali halide complexes, 2 Kit). infrared and raman of trans-difluorodichloroethylene, 2161.

infrared flame, 1366.

infrared, of asphalts, J63A2, 189. infrared, of crystalline polyphenols, RP2829.

infrared, of hvdrogen cyanide and deuterium evanide,

1739.

infrared, of molecules of the atmosphere, 2377.

infrared, of sugar acetates in solution, RP2772.

infrared, of thermally degraded polv(vinvl chloride), RP2832.

mars, high-dispersion, 2152. mass, and relative sensitivities of some polvphenvls, RP2831.

mass, of aromatic hydrocarbons filtered from smoky

air, RP2876.

microwave, of deutero-ammonias, 260. microwave of molecules exhibiting internal rotation, 2202; 2637; 2638; 2991. molecular complexes, 2994. power, and the minimum detectable signal in meas- urement systems, 1430. power, instantantaneous, 469.

rare-earth, 3090.

rotation-vibration, of deuterated water vapor, 1859;

1949. shape of the nonresonant, 2218.

synthesis and infrared absorption, of some m-polyphenyls, 1951.

tables, 2337. thorium, new description, Mono. 17. trifluoroethylene, 1224. various times after fission, 3105. VLF radiation, of lightning discharges, J 63D2, 199. Yttrium iron garnet, 2966.

Spectral, absorbency of 4-chloro-4'-aminodiphenylsulfone, RP2794.

absorption method for determining population "temperatures" in hot gases, 1882. band-pass determinations by a dynamic approach,

2770. emittance of a silicon carbide heating element, RP2810.

emittance of ceramic-coated and uncoated specimens

of Inconel and stainless steel, 3053. Spectral emittance of uncoated and ceramic coated Inconel an type 321 stainless steel, 3092. energy distribution to the International Commission

on Illumination light sources A, B, and C, 834.

lines as frequency standards, 550. radiant energy from the sun through varying degrees

of smog at Los Angeles, 1545. Spectral-transmissive, properties of plastics for use in eye

protection, 1547. properties of some of the tektites, 1546. Spectrochemical analysis, index to the literature, 1036 ; 2965. Spectrographs, emission, standards, 232. standard samples of iron-base alloys, 2719. standards, investigation of homogeneity of six pro- posed NBS-GMC zinc-base, 1377. Spectrometer, electron absorption, 2541.

fast neutron, TNI (PB151360); TN10 (PB151369).

infrared high-resolution grating, RP2922.

mass, analysis of fluorinated polyphenyls, 1263. mass, analysis of solids, 194. mass, combination crossed-field and time-of-flight, 360. mass, radio frequency, 117. pulse-height distributions, 2856. small grating, for the far infrared region, 1488. Spectrometers, beta-ray, 657.

calibration of, from 2 to 16 microns, Mono. 16. corpuscular, 2791.

electron, 2612.

particle, note on accelerating components, 2649. response functions of total-absorption, 2740.

scintillation, for measuring, 1136.

scintillation, in the study of continuous gamma- and

X-ray spectra between 0.01 and 20 Mev, use, 1955. Spectrometric, mass, study of the decomposition of hydrazoic acid by the electric discharge, 2623. mass, study of the reactions of some hydocarbons with

active nitrogen, 2982. Spectrometry, infrared, with a cesium iodide prism, 744. mass, 478; 1060; 1764; 2624. mass, analytical, 1626. mass, and absorption, polymer degradation, 515. mass, study of degradation of polystyrene, 557. Spectrophotometer, Beckman quartz, 484. Spectrophotometers in the 210-760 m/j region, 625. Spectrophotometry colorimetry, propagation of errors in, 804. data to Munsell renotations, 2522. evidence for the absence of free aldehyde groups in periodate-oxidized cellulose, 314.

optical, analysis of hydrogen-deuterium mixtures in presence of air, 505. Spectrophotometry and aerial photoreconnaissance, 2308. determination of phosphate, 685. low pressure explosions, ultraviolet, 1565.

precision, colorimetry, 2487. Spectroradiometer, grading, design and construction of a blackbody and its use in the calibration, 2513.

ratio-recording, J 64C2, 151. Spectroscopic, analysis of deuterium in hydrogen-deute- rium mixtures, 551. data, determination of molecular structure, 2651. determination of the dissociation energy of the OH

radical, 1503. evidence for triatomic nitrogen in solids at very low

temperatures, 3054. observations on pentaborane-air flames and explosions, 1883.

source, plasma jet, 3088.

studies of solids condensed at 4.2°K from electric discharge through nitrogen, oxygen, hydrogen,

water, and ammonia, 2309. study of electronic flame temperatures and energy

distributions, 2771; 2310. study of oils used in oil-extended rubber, RP2771.

survey of energy distributions of OH, C2 , and CH

radicals in low-pressure acetylene-oxygen flames,

2311. Spectroscopy, 1504. cesium iodide prism molecular, further infrared measurements, 1351. chemical, 35. emission, 443; 1013; 1705; 2545; 3021. gamma-ray, 2139.

kinetic, in the far ultraviolet, 2607. meeting, June 1956, Report on Joint Commission,

1849. microwave, broad-band coaxial stark cell, 178; 358.

optical, stable carbon isotope analysis, 1892.

optical, stable nitrogen isotope analysis, 2775. what use is it, 622. Spectrum, absorption, of vibrationally excited N2 in active

nitrogen, 2887. amplitude, and scale of refractive index in homogeneities in the first 125 meters of the atmosphere,

1258. analysis of sferics, 2312. bounded self-adjoint operator, 220. bromotrifluoroethylene, 1206. C3 molecule between 3600 A and 4200 A, 1885; 2313-

electron density fluctuations in the ionosphere, 2381. energy levels of neutral helium (

4 He I), J 64A1, 19. bremsstrahlung, electron, 2755. D2 0, vibration-rotation, 891. dynamic, for Sacremonto Peak, 1233. emission, of OH from 1.4 to 1.7m, 860. emission of OH from 218 to 4.1m, 2356. energy, resulting from electron slowing down, 1015 373
first, of iodine, description and analysis of, J 63A1, 1. frequency-shift radio phototransmissions, 1884. hafnium, 1208. HDO, vibration-rotation, 892. infrared absorption, of n-dimethyl-amino-diborane,

1365.

infrared, and rotational constants of carbon disulfide, 1932.

infrared, and structure of perchlorylfluoride, 193. infrared, hydrogen sulfide, 1187. infrared emission, of methane at 3.3 microns, RP2803.

infrared multiplets, 743.

infrared, of acetylene-di, 1934.

infrared, of carbonyl sulfide, 2162.

infrared, of hydrogen sulfide, 1040; 1740.

infrared, of hydrogen sulfide from 2200-2800 cm"1

, 1741.

infrared, of nitrous oxide, 1782.

infrared, of perchlorylfluoride, 1933.

infrared, of tertiary butyl fluoride, 2820.

inversion, absorption in the low-frequency wing of the NH3 , 639. mass, of gallium vapor, 758. methane from 2,470 to 3,200 cm-1

, infrared absorption, J 64A3, 201. microwave, and structure of sulfurylfluoride, 2372. microwave, benzonitrils, 1075. microwave, of methyl germane, 2992. microwave, of perchlorylfluoride, search for, 1863. ND3 , microwave absorption, 766. normal matrix, variation, 890. molecules, 2205. OH, J 63A3, 279. one parametric family of matrices, 1100. raman of triethylborane, 2278. rhenium, first, term analysis of, RP2804.

rotational lines of CH, OH, and CN, 2292. second, of molybdenum, description and analysis, RP2856.

second, of zirconium into the infrared, extension of, 717.

solar, CH, J 63A1, 19. solar, rotational, of CH, OH, and CN, 2292. Spectrum, vibrational, of chlorotrifluoroethylene, 893. 1-fluoro-l-chloroethylene, 1576. fluorotrichloroethylene, 1577. tetrabromoethylene, 1973. Specular-gloss measurement of ceramic materials, 1886. Speed, of sound in water by a direct method, RP2795.

sound in water near the turning point, temperature

coefficient, 1914. Sphere, an exact earth-flattening procedure in propagation, J 64D1, 61. Sphere-gap volt-time curves—standards for steep front surge measurements, 2314.

Spherical, aberration, improved optical test, 950. body, a problem in self-heating, RP2773

core, impedance characteristics of a uniform current

loop, J 64D3, 295. earth from a sinusoidal source current, 3024.

spheroidal, and cylindrical bodies, J 64B1, 15. wave pulse by a half plane screen, diffraction, 2086.

Spheroidal, spherical, and cylindrical bodies, J 64B1, 15. wave equation, 518. Spin-spin, absorption in chronic methylammonium alum

and manganous chloride tetrahydrate at very low

temperatures, 1887. absorption in manganous chloride tetrahydrate, 1888. relaxation at very low temperatures in chromic methylammonium alum, 1889. Spinning, preparation of bituminous materials for, 800.

Splitting of the giant resonance for deformed nuclei, 2772. Sporadic E, and aurora, echoes at Barrow, Alaska, rela- tionship, 1845. F-scatter program, TN48 (PB151407).

ionization, 2885.

reflections, 2. television reception, effect on, 574; 859.

VHF oblique incidence circuits, 2773. VHF transmission in North America, 3074.

Springs, plastic, 1810.

plastic, reinforced, 1843. Spurious resolution of photographic lenses, 315. Square, clamped plates, vibration, 1435. hollow, torsion, 2385. Squares, Latin, a note on the four by four, 5. Stability, of austenitic stainless steels at low temperatures

as determined by magnetic measurements, 3093.

interfacial waves between two streams, approximate

theory, 1632.

oscillations of superposed fluids, 1890. phase, measurements of over a low-level tropospheric

path, J 63D1, 45. quartz resonators at very low temperatures, 2315.

silver and Pyrex in perchloric acid-silver perchlorate

solutions and in conductivity water, J 64A1, 127.

Stabilization, amplitude of a microwave signal source, 2452.

film processing for X- and -y-ray dosimetry, 1891.

free radical, in condensed phases, 257.

free radicals ai. low temperatures, Mono. 12; 2316.

Stabilized free radicals, 2774.

Stabilizer, power, microwave, 90. Stable, carbon isotope analysis of optical spectroscopy,

1892.

electronic voltage regulator, 135. nitrogen isotope analysis by optical spectroscopy,

2775. systems of differential equations with integrable

forcing term, 1893. voltage controlled logarithmic attenuator, 935. Stable-output oscillator, 552. Stacks, plumbing, capacity, 1281.

Stainless steel, austenitic, stress corrosion cracking of type

304, 1898. determination of aluminum in high temperature

alloys, J 64 A2, 181. 17-7 PH, 2883. Standard, American, building code requirements for masonry, 945. chamber for the measurement ot low energy X-rays, J 64C1, 49.

cells, portable potentiometer and thermostated containers, 1450. deviation of a normal population, estimating, 713. electrode potential of the silver, silver chloride elec- trode, 1895.

federal, new, on colors, 2213.

free-air ionization chambers, plate separation require- ments, 1110. frequency and time, atomic clock, 148. materials, issued by the NBS, C552, 3d ed. methods of measurement in architectural acoustics, 2226. microphones, laboratory, 1048. multipurpose for microchemical analysis, 2641. natural rubber, 1505. primary, of frequency, 737. proposed, for facilities for scientific conferences, 2434.

resistors, rack for, 3026. samples, 835. samples and reference materials, issued by the NBS,

C552, 3d ed.

test for photoflash cells, 1506.

transistor frequency, 900. transmissions, low frequency, 2179. transmittance, in the ultraviolet, 388. wind load requirements, new, 2214. WWV, frequency transmissions, 2871; 2872. X-ray diffraction powder patterns, C539, Vols. 7, 8, 9. Standard, frequency, at low temperatures, 1589. broadcast at very low frequency, 2270. broadcast reception, world-wide, 623. broadcasting station, world-wide, the power re- quirements and choice of an optimum frequency, J 63D1, 35. NBS primary, 872. 374
station WWVH, 42. transmission and time signals, 3054A.

Standardization, of beta-emitting nuclides, 1200. moaning of pH measurements, 1767.

radioactivity, in the United States, 2712. research in the plasties industry, 1857. screw thread, 1862. screw thread, another milestone, 2025.

sulfur-35 by 47r-eounting, RP2859.

textile testing methods, international cooperation, 471, Standards, and codes, governmental aspects, specifications, 1880. Association, American, report of the committee, 3036.

basic, for science and industry, 2037. common, government and industry use, 2144 development of VHF field-intensity, 427.

dielectric, American, 944. dimensions, and units, 2088.

electrical measurements, 316.

electronics, 1508. emission spectrographs, 232. frequency, 456. frequency, precision quartz resonator, 1111. frequency, spectral lines, 550. good and bad, 2777A.

help in the selection of sheets and pillowcases, 136. high-frequency impedance, 2583.

laboratories, local, 2977. length and light waves, 1387. measurement, classification and nomenclature, 2486A. measurements for electronics, 2776. measurements of frequencies and time intervals in the U.S.A. from 1954 to 1957, 2550. NBS, 1507. national physical, and design of experiment, 2210. neutron flux measurement and neutron dosimetry,

3055. new, for science and industry, 2998. pH measurements from 60° to 95° C, RP2797.

physical for the elctronics industry, 1808.

plastics, 1509. primary, atomic definition, 28. radiation protection, 1639. radiation protection regulations, exposure, 2947.

radioactive, preparation and maintenance by the NBS,

1455.

radioactivity, applications, 1631.

radioactivity, international comparisons, 1746.

radioactivity, preparation and maintenance, 1944.

radioactivity, preparation, maintenance, and application, C594.

radioactivity, program, 2714. range 14° to 122° K, heat capacity, 729. research for the plastics industry, 1130. roentgen of Great Britain and USA, intercomparison,

1621. roentgen ray, intercomparison of French and U.S., 2017.

science, 198.

scientific, fifty years, 236. screw-thread for Federal Services, H28 (1957) Part II. shoe last sizes, 113. specifications for plating, 1447. temperature, 836. time, at the NBS, molecular and atomic, 2549.

time, precision, 209. X-ray, comparison, 916; 1230. Stannide, magnesium at low temperatures, electrical conduction, 1695.

Stark, broadening function for the hydrogen lines, C603.

effect, 1510.

effect of NO molecule, 2840.

Stars, radio, observed at Boulder, Colorado, ampli- tude scintillations, preliminary analysis, TN20

(PB151379).

State, control of protection against ionizing radiation, 1151. NBS weights and measures administration, 485.

Static calorimeter, applicatioi

tics of medium-pricei

2061. approach to the problem of multiple radio interference to FM and television service, 378. aspects of analytical determinations, 553. chain-ratio method for estimating relative volumes of mail to given destination, J 64C1, 37. characteristics and narrow-hand teletype message

errors on a single-sideband 600-tnilo-long ul- trahigh-frcquency tropospheric radio link, measured, J 64D2, 125. characteristics of VLF atmospheric radio noise, measured, 2188.

decision procedures and zero-sum two-person games,

design of experiments, 2500. designs for experiments, 133. dry, for rf power measurement, 2419. dynamic tests for mechanical properties of fired plastic refractories and other more resilient materials, 1684.

electricity, hazards from, 461. fatigue tests of flush riveted joints, 1345. methods in chemistry, 1896; 2779. prediction of radio ray bending, TN44 (PBl 51403).

principles of testing, 1511.

results and their shortcomings concerning the iono- sphere within the auroral zone, 2317. sampling methods to outgoing letter mail characteristics, some applications, TN16 (PB151375). treatment of analytical data, 2780.

Statistical engineering: acceptance sampling by variables, 16. acceptance sampling of electroplated articles, 940. analysis for some partially balanced incomplete block

designs having a missing block, 953. analysis of covariance for incomplete block design, 2342.

analysis of incomplete block designs, 2343. analyzing straight-line data, 652. aspects of prediction in the study of complex systems,

2225. asymptotic behavior of tests on the mean of a log- arithmic-normal distribution with known variances, 2030. asymptotic transformation of certain distributions into the normal distribution, 1795.

certain Fourier transforms of distributions, 202. certain fourier transforms of distribution: II, 965. chain block design, 852. chain block designs with two-way elimination of heterogeneity, 966. changes of sign of sums of random variables, 662. comparative tests in a single laboratory, 39 components of variance in preparing schedules for sampling of baled wool, 346. computation of x

2

, 2877. computers in statistics, 2404. confidence and tolerance intervals for the normal

distribution, 674. confidence intervals for the expectation of a Poisson

varible, 2915. confidence intervals in regression problems, 2429. . connections between probability theory and differentail and integral equations, 278. contributions to Dictionary of Physics and Electronics, 1660. contributions to Handbook of Physics, 2500. contributions to the theory of rank order statistics

the two sample case, 1661. control charts may be all right but—, 676. design of experiments in operations research, 1670. design of experiments in research and development,

2083. deviation of the Poisson distribution, 2823.

distribution of a serial correlation coefficient near the ends of the range, 2527. duration of random walks, 281. 375
elements of a mathematical theory of probability,

708. elimination of randomization in certain statistical decision procedures and zero-sum two-person

games, 231. embedding theorem for balanced incomplete block

designs, 948.

essential property of the Fourier transforms of dis- tribution function, 391. estimating the standard deviation of a normal population, 713. estimation of parameters in certain stochastic processes, 334. evaluation, 155. evaluation of analytical methods by the sensitivity

criterion, 2112. exact evaluation of the variances and covariances of order statistics in samples from the extreme-value

distribution, 788. examples of the use of high-speed computers in statistics, 2302. experimental statistics, 445. experiments with many factors, 2120. Fisherian revolution in methods of an experimentation, 335.

fitting a straight line to certain types of cumulative

data, 2125.

four by four Latin squares, 5. fractional factorial experiment designs for factors at three levels, AMS54.

fractional factorial experiments of 2m3" series, 2568. function to aid in the fitting of kinetic data to a rate equation, 1983. further contributions to the solution of simultaneous

linear equations and the determination of Eigenvalues, AMS49.

geological application of extreme-value methods to interpretation of cobbles and boulders in gravel

deposits, 1723. index for rating diagnostic tests, 71. information theory aspects of propagation through

time varying media, 1143. instrumental drift, 1041. interpretation of chemical data, 579.

literature, 1930 to 1957, selected bibliography, J64B1

55; J 64B1, 69. locating sources of variability in a process, 253. making one measurement do the work of two, 757. mathematical services useful in industry, 759. mechanical point of view, Boltzmann equation, 1922. mechanical theory of transport processes, 2778. mechanics, quantum, 2340. multi-factor experiments, 2995. multi-factor experiments for evaluating reliability, 2207. National physical standards and design of experiment,

2209. new method of analyzing extreme-value data, 922. normal distribution, 1595. operating characteristic of the average chart, 588. optimum grouping in one-criterior variance components analysis, 1102.

partially balanced designs, 923. Physics. Measure for measure: some problems and

paradoxes of precision, 287. prediction of system performance from information on component performance, 2223.

principle of randomization in the design of experi- ments, 2378.

principles of experimental design, 880. probability distribution of the amplitude of a constant vector plus a Rayleigh-distributed vector, 1541. probability distribution of the phase of the resultant vector sum of a constant vector plus a Rayleigh

distributed vector, 591. probability limits for the average chart when process standards are unspecified, 1116. problems on random walks in space, 310.

procedures for the rejection of suspected data, 784. property of additively closed families of distributions, 2433. property of the normal distribution, 928. random flight with multiple partial correlations, 525. rejection of outlying observations, 813.

relations among certain ranges of vector measures, 299. relations among the blocks of symmetrical group divisible designs, 548.

reliability of measured values, 594. sampling of leather, 3039.

selection of a limited number from many possible conditioning treatments for alloys to achieve best coverage and statistical evaluation, 155. sequential decision problems for processes with con- tinuous time parameter, 824.

sets of three measurements, 825. smooth patterns of production, 1139.

statistical approach to the problem of multiple radio

interference to FM and television service, 378.

statistical aspects of analytical determinations, 553.

statistical designs for experiments, 133.

statistical methods in chemistry, 1896; 2779.

statistical principles of testing, 1511.

statistical results and their shortcomings concerning

the ionosphere within the auroral zone, 2317.

statistical treatment of analytical data, 2780.

statistician and the post office: a case history in operations research, 2881.

statistics—a tool in testing rubber, 1512.

statistics and planning tests at elevated temperatures,

137.

statistics in analytical chemistry, 138. stochastic independence of symmetric and homogeneous linear and quadratic statistics, 596. strongly continuous stochastic processes, 1095. study of accuracy in chemical analysis using linear calibration curves, 2328. studying the accuracy and precision of an analytical procedure, 926. suppression of bubbling in boiling refrigerants, 2330. survey of adhesion and types of bonds involved, 1157. tables for constructing and for computing the operating characteristics of single sample plans, 563. tables of the bivariate normal distribution function and related functions, AMS50.

technique for locating sources of variability in a process, 324. theory of extreme values, 3096. uncertainty of measurements, 1953. uniqueness of the triangular association scheme, 2835. use of statistics to determine precision of test methods,

165. weighted compounding of two independent signifi- cance tests, 3098.

Statistician and the post office: a case history in operations research, 2881.

Statistics—a tool in testing rubber, 1512. analytical chemistry, 138. computers in, 2404. determine precision of test methods, use, 165. experimental, 445.

free radical, 2571. high-speed computers in, some examples, 2302. improve physics, chemical, and engineering measurements, 68. order, in samples from the extreme-value distribution, 788. planning tests at elevated temperatures, 137. symmetric and homogeneous linear and quadratic,

stochastic independence, 596. two sample case, contributions to the theory of rank

order, 1661. Weibull distribution, moments of order, 1428. Status, of absolute measurements at the National Bureau

of Standards, 2781. ASTM methods and standards for appearance evaluation, 3055A.

Steam, thermal conductivity, 1657. 376
Steam-driven water jets for propulsion purposes, RP2830.

Steel, action of boron in enhancing the hardenability of, 851. Austenitic stainless, 2789. Austenitic stainless, stress corrosion cracking of tvpe

304, 1898. boron-treated, temper brittleness, 1913. cathodic protection in salt water, RP2833.

concrete, and lead, broad and narrow beam attenuation of Ir 192 gamma rays, 2480. determination of nitrogen and sulfur, 426. high resistivity environment, current and potential

relations for the cathodic protection of, J 63C1,

37. low-allov, ferrite lattice in, elastic and plastic behavior,

1691. photometric determination of tungsten in, RP2812.

plastic surfaces on clotting time of human blood, effect

of, 1003. porcelain enamel ground coats, 2358.

reinforcing, bv means of tensile bond specimens, 2113. SAE 1050, 1186. separation and determination of small quantities of aluminum in, J 64A3, 235. 17-7 PH stainless, 2883.

stainless, Inconel, 3053.

stainless, influence of copper ions on the adherence of vitreous coatings, 1737.

stainless, needle value, improved, 1034.

stainless, type 321 and Inconel, ceramic coated, 3092.

strength, new ultra high, 2215.

thin porcelain enameled sheet, flexibility, 2126.

Steels, boron, 1642. boron-treated, study of the impact properties, 1601. determination of titanium, zirconium, niobium, and

tantalum, RP2923.

high strength fatigue properties, 2951.

selected, tensile properties of, as a function of temperature, 2384. slack-quenched alloy, impact properties, RP2799.

stainless, austenitic, at low temperatures as deter- mined bv magnetic measurements, 3093.

Stellar atmospheres, 2463. atmospheres, aerodynamic phenomena, TN30 (PB151389).

Steric, effects in azo- and indigo dyes, 1897. hindrance to coplanarity in o-fluoro-benzidines, 837. Sterochemical research, 554.

Stiffness, of paper, 883. paper, measuring, 762.

tester, NBS, extending the range of, 1020.

Stochastic, doubly, transforms of a vector, 2658. independence of symmetric and homogeneous linear and quadratic statistics, 596. matrices, doublv, subdeterminants, 2227. matrix, doubly, 3008. problems in wave propagation, 1147.

processes, 1095.

processes, certain, estimation of parameters, 334. processes in arbitrary sets, with applications to processes with absorbing regions and to the problems

of loops in Markoff chains, time discrete, 1286. processes to chemical kinetics, the application of the

theory, 2805; 2898.

)kes flow problem for a class of axially symmetric bodies, 2832. Stokes-parameter technique for the treatment of polarization in quantum mechanics, 936.

Storage, Dewars, breathing oxygen, 2038.

lead, batteries, 751. Storm-D region, motion of, 1078.

Strain, gages at elevated temperatures, 2420.

gages, bonding agents for high-temperature, 2474.

rate and strain, compatibility equations and conditions of integrability, RP2813.

Strain-gage-type testing machine, surface tension measurements, 2794.

Strains in beams having diagonal cracks, 2782.

Stratification, in the lower ionosphere, J 63D2, 117. lunar, of the F2 layer at Hyancayo, Peru, 83. Stratosphere and troposphere, refractivity, 3032. Strength, and fatigue, of glass at very low temperatures,

2318. experimental study, 2014.

Stress and strain at onset of crazing of polymethyl methacrylate at various temperatures, 555; 669; 838. Stress-corrosion cracking, of Austenitic stainless steel, 2789. AZ31B magnesium alloy, mechanism of, RP2919.

gold wedding ring, 1513. type 304 austenitic stainless steel, 1898.

Stress-solvent crazing of acrylics, 839.

Stress-strain, curves from strain waves in long bars, de- termination of dynamic, 684. elongation graphs for alclad aluminum alloy 24S- T86 sheet, 139. recorders, autographic, 2465.

relation of pure-gum rubber vulcanizates in compression and tension, RP2837.

relations, dynamic pulse method for determining,

1997.

relationships in yarns subjected to rapid impact

loading, RP2866; 1514; 1515; 1516; 1899; 2783.

relationship in yarns tested at rates of straining up

to a million percent per minute, 1900.

Stress studies of bulkhead intersections for welded tankers, 556. Stresses (residual) in two-phase alloys, RP2793.

thermal, determination of loads in the presence of, 988. Stressing fatigue, damaging effect, 1566.

Strips with holes loaded through pins, elastic deformation, RP2945.

Stroboscope, high-speed, for accelerometer calibration, 1031. Stroboscopic interferometer for vibration measurement,

2784. mapping of time-variable fields, 140. vibration analyzer, J 63C2, 97. Strongly continuous stochastic processes, 1095. Strontium, aluminate hydrate, observations on, RP2777.

Portland cement, flame photometric determination,

1346. oxide content of portland cements, 2382.

Structural, analysis and influence coefficients for delta wings, 840. analysis of clinical dextrans by periodate oxidation and isotope dilution techniques, 2319. anomalies in pure cristobailite, 3048. changes in irradiated plastics films, 3056. changes in natural rubber during vulcanization, in- frared study, RP2816.

failures of welded ships, investigation of, 746. interpretation of immiscibility in oxide systems, 2320; 2320A; 2785. materials at low temperatures, mechanical properties, Mono. 13. rearrangements in silicate glasses during annealing,

1901.

Structure, in alkali silicate binary glasses, RP2854.

anhydrous scandium phosphate, 1950. bone mineral, 2383. ethylene from infrared spectra, 2833. 5-aldo-l,2-0-isopropylidene-D-xylo-pentofuranose 2321. iridium-osmium alloys, 1152. magnetohydrodynamic shock wave in a plasma of

infinite conductivity, 1902. methylamine molecule. I. Microwave spectrum of CD3ND2, 2322. methylamine molecule. II. Theory of internal motions and application to CD3NO2, 2323. polymer research at the National Bureau of Standards,

1813. theorems for modular subgroups, 1517. turbulence in fully developed pipe flow, 884.

377
vibration-rotation, in absorption bands for the cali- bration of spectrometers from 2 to 16 microns, Mono. 16. Struve functions, properties, 2269.

tables of intervals, 146. Student research on ASTM problems, 1903.

Studies, of atmospheric transmittance on Mauna Loa, RP2910.

beryllium chromite and other beryllia compounds

with R2 03 oxides, J 64A1, 103. borate minerals. VI: Veatchite, 3057.

crystal growth, and electrical and optical properties

of gray tin, 1518. dose distributions in water for betatron X-rays to 37 Mev, 1904.

electroless nickel plating, 2327. galvanic couples. I. Measurement of electromotive

force and internal resistance of cells during

current flow, 141. galvanic couples. II, Some potential-current rela- tions in galvanic corrosion, 142. galvanic couples. III. Polarization and cathodic

protection 143. leather by means of a sonic technique, 1905.

leather fungicides, 2788. nonequilibrium rate processes. I. The relaxation

of a system of harmonic oscillators, 2324. nonequilibrium rate processes. II. The relaxation

of vibrational nonequilibrium in distributions

in chemical reactions and shock waves, 2325. nonequilibrium rate processes. III. The vibrational relaxation of a system of anharmonic oscillators, 2786. nonequilbrium rate processes. IV. The rotational and vibrational relaxation of a system of rotating

oscillators, 2787. oxidation behavior of enameling iron during firing, 1153. polar amino acid content of collagen and related

material, 841.

stress corrosion cracking of Austenitic stainless steel, 2789. transequatorial ionospheric propagation by the

scatter-sound method, 2326. Study, of accuracy in chemical analysis using linear cali- bration curves, 2328. burst test as applied to military upper leathers, 842. degradation of polystyrene by means of mass spec- trometry, 557. earth currents near a VLF monopole antenna with a

radial wire ground system, 2437. experimental, of the strength and fatigue of glass at very low temperatures, 2014. impact properties of boron-treated steels, 1601. limb flares and associated events, 2882. magnetic maps of the sun, 1600

1,046 megacycles per second of the reflection coefficient of irregular terrain at grazing angles, J 63D2,

235. meteorological effects on radio propagation at 96.3 Mc between Richmond, Va., and Washington,

D.C., 635. morphology of ionospheric storms, 2884. operations involved in cement analysis, 937. radio reflections from meteor trails in research on the upper atmosphere, 144. setting of plaster, 3058.

17-7 PH stainless steel, 2883. thermistor materials for use as temperature-sensing elements in the high-velocity exhaust gases of jet-type engines, 1602. upper atmosphere in the auroral zone, 2766.

variation of the physical and chemical properties of chrome-tanned leather and the selection of sampling location, 558. VLF field strength data: both old and new, 2438.

Styrene, acrylate polymers in a vacuum, 811. a-deuterostyrene polymers, oxidative degradation,

1802.

Subdeterminants of doubly stochastic matrices, 2227. Subgraphs, dense, moebius function on, J 64B1, 41. Subharmonic crystal oscillators, 1154. harmonic and linear functions of two variables, 280. Sub matrices of a full-rowed non-negative matrix, principal, J 63B1, 19. Subroutine for computations with rational numbers, 1603. Subsonic air jets, reverberation chamber study of the sound power output, 2742.

speeds, mechanism of transition, 2195. Sucrose solutions, determination of inorganic constituents

in, 987.

viscosities of, at various temperatures: tables of recal- culated values, C440 Suppl.

Sufficient conditions for the convergence of Newton's method in complex Banach spaces, 559. Sugar, acetates, infrared spectra, RP2772.

mixtures, determining dextrose in, quantitative chro- motographic procedure for determining, 2276. products, color and tubidity of, 970.

refining, bone char process, 132.

solutions, commercial, light scattering, J 63A3, 205. Sugars, conformations of the pyranoid, J 64A2, 171; J 64A3, 239.

higher, branched-chain, 2476; 2903; 2904.

infrared absorption spectra of some cyclic acetals, RP2960.

reducing and reducing end groups in polysaccharides by reaction with carbon-14-labeled cyanide, de- termination, 2517. reducing, report, 1850; 2732. sugar products, report, 1852.

tritium-labeled, J 64A2, 177. Suggested problem for industry-sponsored shoe research, 379.

Sulfate susceptibility test for portland cements, 11. Sulfide, carbonyl, infrared spectrum, 2162. hydrogen, " infrared spectrum of, from 2200-2800 cm"1

, 1741.

silver, in the photographic image during fixation, formation of, J 64C, 65. Sulfinic acid derivatives as accelerators in the polymerization of methyl methacrylate, 1906.

Sulfur, atomic and empirical affinities of light elements,

electron affinity, 1698. dioxide and sulfuryl fluoride, electron impact studies, 2542. nitrogen in steel, determination, 426. oxygen, diatomic free radicals of the isotopic hydrides,

1357. rubber vulcanizates, 1311. Sulfur-35 beta decay, average energy, RP2859.

Sulfuric acid, absorption spectra of some thioindigo dyes, 342. methods for analysis of wool admixed with cotton and

viscose rayon, 973.

Sulfurylfluoride, microwave spectrum and structure, 2372. Summary of, symposium on color of transparent and

translucent products, 1155. VHF and UHF tropospheric transmission loss data, TN43 (PB151402). Summation method of 0. Perron, 102. Summation methods and integral transformations, J 63B1, 1. Summation of slowly convergent series, 145. Sums of dihedral and trihedral angles in a tetrahedron, 597. Sun, and the arc, predicted lines of Fe 1, 111. atoms and ions in, 958. study of magnetic maps, 1600. technetium in, 322. upon the ionosphere, 250. Sunlamps, fluorescent, in laboratory aging tests for plastics, 1713. Sun's atmosphere, elements in, 1138. Sunspot, cycle, 1112. numbers for cycle 20; 571; 3020. Superconducting transitions in tin whiskers, 1519. Superconductivity, isotope effect, 581. isotopes of tin, 560. microscopic tin filaments, 2329.
Superconductor, field curve, magnetic threshold, 584. Superconductors, 1212. Superposed fluids, stability of oscillations, 1890. Supplementary Zeeman data for the first spectrum of ruthenium (Ru i), J 63 A3, 253. Suppressing microwaves by zonal screens, 317. Suppression of bubbling in boiling refrigerants, 2330.

optical measurements, aid in, 2790. Sur les limites du pouvoir de resolution des spectrometres

corpusculaires, 2791. Sur 1'utilization des observations meteorologiques cour- antes en propagation radioelectrique, 2331.

Surface, currents excited bv an infinite slot on halfplanes and ribbons, 1907. erosion of filled plastics, 2792. Surface area, hydrated portland cement, determination by

water-vapor and nitrogen adsorption, RP2806.

precise evaluation of, with indirectly calculated dead

space, RP2826.

Surface reactivity, buffer solutions, RP2811.

cotton, wool, and nylon fabrics at different temperatures and relative humidities, 2793. Surface tension, alkaline-earth borates containing 3 mole

percent of potassium oxide, 3059.

density, viscosity, and electrical resistivity of molten

binary alkaline-earth borates, 1156. measurements with a strain-gauge-type testing machine, 2794. some simple borates, 2592. with body and surface concentrations, variations, 3110. Surface waves, excitation, on conducting, stratified, di- electric-clad, and corrugated surfaces, RP2807.

Surface-wave resonance effect in a reactive cylindrical structure excited by an axial line source, J64D1, 13. Survey, recorder, C601. Survey of, adhesion and types of bonds involved, 1157. application of ceramics as vacuum tube envelopes,

1604. audio-frequency power amplifier circuits, 187. bibliography of recent research in the propagation of VLF radio waves, TN58 (PB161559).

Central Radio Propagation Laboratory research in tropospheric propagation 1948-1956, TN26 (PB151385). ceramics for nuclear reactors, 12. computer development and applications, 2332. experimental heat capacities of ten technically important gases, 843. geomagnetic eclipse phenomena, 1908. hazards of handling liquid oxygen, 2333. Lyapunov's second method, 2439. present knowledge of sporadic-E ionization, 2885. recent advances in polymer physics, and their relation

to dielectric properties, 2440. Suspended chain, modes of vibration of, 770. SWAC, NBS Western Automatic computer, design features

of a magnetic drum memory, 424. use of subroutines, 614. SWAC-design features and operating experience, 885. Swedish free-air chamber, portable, equipment at the NBS,

calibration, 1644. Sweep-frequency, backscatter data for determining oblique-incidence ionospheric characteristics, use, 2838. backscatter observations, note on, 924. backscatter—some observations and deductions, 1158. oblique-incidence ionosphere measurements over a

1,150 KM path, 561. polarization measurements at low frequencies, 938. pulse technique at oblique incidence, ionospheric in- vestigation using, J 63D2, 151. pulse-transmission measurements over a 2400-KM

path, 1520. Swelling of collagen and modified collagen, 1159. Switch aids, ultrasonic, diversity reception, 1564. Symbolic designations for electrical connections, 2334. Symbols, units and nomenclature, pure, and applied

physics, 189. 569918 0—61 25

Symmetric, continuous poker model, J 64B1, 35. functions of eigenvalues, note, 1990.

integral equations, error bounds for the eigenvalues,

1707. matrix, 192. top molecules, nonresonant absorption, 2648. Symmetric matrices, determination of eigenvectors and

eigenvalues, 330.

linear iteration procedures, 1097. Symmetric-asymmetric molecules, hindered rotation, 1732. Symmetrical group divisible designs, blocks, 548. Symmetry, point, simplified method of locating, 2001. Symposium, color of transparent and transulcent products,

1155.

crystal chemistry, 215. NBS optical image evaluation, report, 532. recent developments in the evaluation of natural rubber, 844.

research, free radicals, 2571.

second, in Linear Programming, proceedings, 1458. temperature stability of electrical insulating materials, 992. Synchronization, precise time, of widely separated clocks, TN22 (PB151381).

Synoptic, study of the vertical distribution of the radio

refractive index, J 63D21, 249. variation of the radio refractive index, J 63D1, 91. Syntax, German, patterns, proposals for the mechanical

resolution, 290. Synthesis, and infrared absorption spectra of some ra-poly- phenyls, 1951. C14 -labeled [.-sorbose and L-ascorbic acid, RP2800.

functional, of linear plots, J 64C2, 115. maltose-l-C14

, maltobionodeltalactone-l-C14

, and lith- ium maltobionate-l-C14 from 3-(a-D-glucopyranosyl)-D-arabinose, 1909. properties of fluorinated polyphenyls, 1521.

slotted-cylinder antennas, 63D3, 303. somedisubstituted 3,4,5,6-tetrafluorobenzes, RP2939.

Synthetic, and natural rubbers, 264; 487; 772; 1412A; 2997.

cuspidine, 2795.

detergents, 318.

fibers, properties of some experimental map papers

containing, 2703. materials in America in 1949, developments, 21. rubbers, physical chemistry of, 1107. sapphire, refractive index, 2727.

single crystal corundum, elastic constants of, at room

temperatures, J 64A3, 213.

textiles, 845; 1522. Synthetically bonded molding sand, 846. System, behavior, prediction of, 2660A.

design of digital computers at the NBS: methods for high-speed addition and multiplication, C591,

Sect. 1. lime-alumina-water at 1° C, RP2877.

loss in radio wave propagation, J 63D1, 53. magnesium oxide-germanium dioxide, 3094. names for binary numbers, 2441. Systematic, calculations of gamma-ray penetration, 847. ionospheric winds, 319.

research, 3060. Systems, distinct representatives and linear programming,

1910. equations, matrices, and determinants, 562.

inequalities involving convex functions, 2335.

linear, zeros of polynomials and the degree of, 790. tuning, amplifiers, feedback, 352. vibrating, decay constant in, 678. Systems of, distinct representatives, 1793.

linear inequalities, 1794. Table, coefficients of the powers of y(y), 1605.

first moment of ranked extremes, RP2787.

radix, for obtaining hyperbolic and inverse hyperbolic

functions to many places, 810. wavenumbers, Mono.3, Vol. I and Vol. II. Wilson quotients and the third Wilson prime, 636.379
Tables, bivariate normal distribution function and related

functions, AMS50.

characteristic values of Mathieu's equation for large values of the parameter, 1523. constructing and for computing the operating characteristics of single sample plans, 563. diagonalizing second-order matrices, RP2838.

dielectric dispersion data for pure liquids and dilute

solutions, C589.

difference, for linear interpolation, rounding off, 504. expected values of 1/X for positive Bernoulli and

Poisson variables, 1161. exponential integral for complex arguments, AMS51.

4f-l through 4f-6 on thermal expansion, 2336.

generalized, of corrections to thermodynamic properties for nonpolar gases, 1721.

integral, J%~"

3 du, 320.

intervals of Struve functions, 146.

line strengths for rotational transitions of asymmetric

rotor molecules, 2796. median hourly values of the cosine of the solar zenith angle (x) for thirty-five locations, TN5

(PB151364).

natural logarithms for arguments between five and

ten to sixteen decimal places, AMS53.

1958 He4 temperature scale, J 64 A 1-25; Mono. 10. 142 to 144, thermal expansion, 1160. osculatory interpolation coefficients, AMS56.

physical, 1138. punched cards, a guide, 177. punched cards, a guide, addendum, 641.

radix, for trigonometric functions and their inverses

to high accuracy, 296. recalculated values: viscosities of sucrose solutions at various temperatures, C440 Suppl.

relating to Hankel integrals of order zero, errata, 147

spectra, 2337. speed of sound in water, 3061.

statistical prediction of radio ray bending, TN44

(PB151403). thermodynamic, mechanized computation at the NBS, 2632; 2988. transport integrals, C595.

transport integrals: a supplement, J 63B1, 23. viscosities of sucrose solutions at various temperatures: tables of recalculated values, C440 Suppl. Tabulation of data on receiving tubes, H68. Tacan coverage and channel requirements, 2337A.

Taillights and brakelights, configuration, 1587. Tangential distortion, prism, effect, and camera tipping, 2264. Tank, farm milk, testing, 1344. Tankers, welded, stress studies of bulkhead intersections, 556. Tantalum, copper, molybdenum, and gold at 662 kev,

total photoelectric cross sections, 3101.

elastic scattering of photons, 2535. niobium, titanium, and zirconium in steels, deter- mination, RP2923.

titanium-base alloys, determination of niobium, RP2929. Tape recorders, magnetic, FM data reduction from, 722. Tapered cantilever beams computed on SEAC, influence

coefficients, 467. Tapes, testing of measuring, C572.

Targets, square wave, J 64C1, 57. Tartrate buffer solutions, 262. Tauberian, theorem for Abel summability, 275. theorems for summability (Pm), 321. Tchebycheff approximations, criteria for the existence and equioscillation, J 64B2, 91. Teaching pay in the Soviet Union, 1524. Technetium in the sun, 322. Technetium-99, nuclear moments, 875. Technical aspects, industrial and office quieting, 324.

large scale liquid helium liquefaction and transportation, 2797. 380

Technical considerations leading to an optimum alloca- tion of radio frequencies in the band 25 to 60 Mc, TN13 (PB151372). Technique for, cutting very thin sections and its application to the electron microscopy of fibers, 4. locating sources of variability in a process, 323. monitoring tritiated-water vapor in air, 2338. sweep frequency polarization measurements at low

frequencies, 938. Techniques, accurate measurement of antenna gain, C598.

electroforming of precision waveguide components in the millimeter wavelengths, 2339. scanning, processing of two-dimensional patterns,

802. theory of fast coincidence experiments, 1911. Technological, challenge to the textile industry, 2002. measurement progress, scientific, 537.

society, demands on teachers, 2512. supremacy, precise measurement and race for, 2696. Technology, Nation's, service for, 1999. Tee, magic, matching loads, 83A.

Teeth, fluorescence of, 721. fluorescence of: a means of investigating their structure, 452.

plastic, bonding of, to heat cured denture base resin, 402.

plastic, physical properties, 2688.

plastic, proposed specification, 2272.

Teflon, insert makes needle vacuum tight, 848. Kel-F, ignition, 2591.

transition in, volume-temperature relationships for the room temperature, 356. Tektites, lost planet, 1525; 1912. meteoric glass, 1912A.

spectral-transmissive properties, 1546. these glass objects fallen from the sky; do they come

from a lost planet? 1756. Telemetering and fax: how FM expedites weather data

distribution, 69. Television, airborne, station, TN35 (PB151394). bandwidth conservation, communication theory as- pects, TN25 (PB151384).

broadcasting, measurement of a service area, 2190.

color, 38.

color, present status, 154. FM broadcasting stations, variation with frequency

of the signal range, 347. FM service, statistical approach to the problem of multiple radio interference, 378.

reception, effect of sporadic E, 574; 859. Temper brittleness of boron-treated steel, 1913. Temperature, absolute, below 1° K: chromic methylam- monium alum as a thermometric substance, 2009. adsorption of water vapor by collagen and leather, 74. aluminum alloys under various conditions, 2505. between 0° and 75° C and at pressures up to 2500

atmospheres, thermal conductivity of argon,

1952. chromospheric, 874.

coefficient of the speed of sound in water near the turning point, 1914.

coefficients of non-Newtonian viscosity at fixed shear- ing stress and at fixed rate of shear, 849. constant, liquid helium bath and reproducibility of resistance thermometers, 2916. degree of polymerization on the sorption of water by

polymethyl methacrylate, effect, 1328. du point du zinc et comparison de deux determinations du point du soufre dans un appareil fermi, 2799.

effects in gas-free liquid scintillators, 1915.

effects, liquid-scintillator, 1759. emission corona, 2930.

function, tensile properties of selected steels, 2384. function of, Young's modulus of various refractory

materials, 3114. helium vapor-pressure scale, 1535.

high, alloys, 3072.

high, ceramics and cermets, Mono.6.
high, heterogeneous reaction of chlorine and nickel between 1200 and 1700° K, kinetics, 2608.

high, laundering, test for dimensional changes in woven fabrics, 2802.

high, liquids, 1032.

high, strain gages, bonding agents, 2474. high-vacuum gradient furnace, 2588.

influence of, on the adsorption of chrome (Cr2 03) by

calf skin squares, 2159.

influence of strain rate, on the creep of cold drawn

ingot iron, 73. nversion in cristobalite, RP2902.

nversions of anhydrous gallium orthophosphate, 1916.

low, data: properties of paramagnetic salts, 2408

low, distillation of hydrogen isotopes, 2618; 2691. ow, microcell for infrared study of condensed gases, 2619.

off, physics, 1055; 2180. ow, properties of plastic foams, 2620. ow, reduction of area gage, 7. ow, scales from 90° to 5° K, 1392.

low, thermal conductivity of free-machining copper,

1393. measurement and control, C590. measurement and incomplete equilibrium, 1735.

microcell for infrared study of condensed gases, 2800.

on-off, control for electrically heated filaments, 2660. power loss and operating, of tires, J 64C1, 1. prediction in electronic design, 564. pressure-volume, relations of liquid normal deuterium,

1115. range, extended, volume temperature relations of amorphous polymers, 1975.

resistance, relation for low temperature thermometry,

9. room, thermoelectric power of germanium, 897.

rotational, of OH in diluted flames, 818.

scale below 1° K, adiabatic demagnetization, 384. square, wave in a filament operating at low temperatures, 2701.

stability of electrical insulating materials, 992. standards of, 836.

stratification in a nonventing liquid helium Dewar,

J 64C1, 19. studies of air in a truck tire, 1917.

transition in teflon, 356. very low, an experimental study of the strength and

fatigue of glass, 2014. volume, relations of amorphous polymers over an

extended temperature range, 1975. zinc point and the comparison of two kinds of deter- minations of the sulfur point in a closed apparatus, 2799. Temperature control, cryostat, wide-range, 3113. during mixing of rubber compounds, 1526. resistance diode bridge circuit, TN34 (PB151393).

wide-range, design of simple DC resistance thermometer bridges, 2515. Temperature dependence, breakdown field of barium titanate, 3062.

characteristic energy loss of electrons in aluminum,

2798.

distribution functions in quantum statistical mechanics, 2340. mechanical shear degradation, 1527. microwave absorption of NH3 , 1162. Temperature measurements, flames and hot gases, experi- mental, 1340. high-velocity streams of hot gas, 1163. Mooney viscometer, 1164. Temperature scales, heat units for calorimetry, 1355. present status, 590. Temperature-independent paramagnetism of ammonium

hexabromoosmate, 1201. Temperature-induced stresses in solids of elementary

shape, Mono. 2. Temperature-sensing elements in the high-velocity exhaust

gases of jet-type engines, 1602.

Temperatures in atomic explosions, 1528. copolymers, glass transition, 2576. developed in rotating dental cutting instruments,

1165.

electronic flame, and energy distributions, spectroscopic study, 2310.

elevated, calculation of properties of gases, 2664.

elevated, creep behavior of transparent plastics, 2921.

elevated, determination of viscosity of exhaust-gas

mixtures, 989. elevated, elastic moduli of glasses, by a dynamic

method, 1692. elevated, evaluation of resistance strain gages, 2420.

elevated, physical characteristics of titanium carbide type cermets, 1445. elevated, protection of molybdenum from oxidation,

2705. elevated, statistics and planning, 137.

gas, measurement of, by immersion type instruments,

867. heats of transition and fusion, 3079. helium-vapor pressure scale, 2818.

high, kinetics of elementary gas phase reactions, 1 433.

high, measurement in gas streams, 85. high, measuring thermal emittance, 3049A.

high, precision thermostat, 110. high, thermodynamic properties, 2394. hot gases, 1882.

low, TN4 (PB151363); 2730.

low, calibration of thermocouples, 2483.

low, copper functions, 2537.

low, effect of tensile strain, on deformation twinning

in ingot iron, 695.

, electrical conduction in magnesium stannide,

1695. ow, form electric discharges, absorption spectra of

solids condensed, 2445. ow, formation of ozone from atomic oxygen, 2954. ow, frequency standards, 1589. ow, from a gas discharge, 3052. ow, glass dewars for optical studies, 2575.

, impact strength of some thermosetting plastics, 464.

•, impact testing of various alloys, 2819

low, liquid level indicator for condensed gases at, 1052. luminescence of solids, 2934. magnetic losses, 2980. mechanical properties of insulating plastic foams,

2985. mechanical properties of structural materials, Mono. 13. low, operation of bearings and pumps, 2676.

low, properties of materials, 2268.

low, properties of the Cr+++ ion in the paramagnetic

alums, 522.

low, quartz crystal resonators and oscillators, 2734. some mechanical properties of Mylar and Dacron

polyester strands, 2761

.

.ow, stability of austenitic stainless steels, as de- termined by magnetic measurements, 3093.

stability of quartz resonators, 2315. ow, stabilization of free radicals, 2316; Mono. 12. strength and fatigue of glass, 2318. ow, thermal conductivity of some commercial coppers,

2181.

.ow, triatomic nitrogen, 3054. ow, wide-range control, design of simple resistance thermometer bridges, 2516. 1958 He4 scale, J 64A1, 1; Mono.10.

piezoelectric constants of alpha- and beta-quartz,

108.

relatively low, thermal hydrogen-oxygen reaction, 345. rotational and vibrational, of CH in flames at at- mospheric pressure, 816.

rotational, of OH in methane-air flames, 304.

rotational, of OH in several flames, 534.

381
stress and strain at onset of crazing of polymethyl

methacrylate, 838. up to about 800-900° C, thermal degradation of polymers, 2843.

various, stress and strain at onset of crazing of poly- methyl methacrylate, 555. various, viscosities of sucrose solutions: tables of recalculated values, C440 Suppl. very low, in chromic methylammonium alum, spin- spin relaxation, 1889. very low, spin-spin absorption in chromic methylam- monium alum and manganous chloride tetrahydrate, 1887. Tendon collagen, shrinkage, 120.

Tensile, behavior of titanium and a titanium alloy, effect of strain-temperature, RP2897.

crazing properties of acrylic plastic glazing, effects of moderate biaxial stretch-forming, 436.

forces in tightened bolts, 344. impact strength of annealed and welded 5086 alumi- num down to 20° K, 3095.

properties of polyester film, 2354.

properties of selected steels as a function of temperature, 2384. strength and extreme values, two early papers on the

relation between, 1219. Tension, creep in, bend-test method of determining the

stress required, 1584A.

surface, measurements with a strain-gauge-type test- ing machine, 2794.

testing of plastics, 2341.

testing of rubber rings, 2801. Tensorial sets, 2970. Tensors, absolute, of arbitrary order, generalization of the index notation, J 64B2, 99. Term analysis of the first spectrum of rhenium, (Re i), RP2804.

(Re n), RP29U.

Terminology, describing the performance of analytical and

other precise balances, 1166. measurement and control, integration of concepts,

1935. Terpenes, physical properties, 1191 A.

Terrain, irregular, study at 1 ,046 megacycles per second of the reflection coefficient of, at grazing angles, J 63D2, 235.

Terrestrial, propagation of very-low-frequency radio waves—a theoretical investigation, J 64D2, 153. radio noise, 2284. Tertiary butyl fluoride, 2820. trimethylphospine, isobutyane, 2638.

Test, chart, power, 268. dimensional changes in woven fabrics in high temperature laundering, 2802.

flex tension, for leather, 917. procedure—error evaluation, 39. procedures, necessity for uniformity, 587. Test methods, practical, for the Porcelain Enameling

Industry, 1452.

specifications, and standards for plastics, 1167.

Tester, voltage breakdown, 908. Testing, colorfastness of textiles, international methods>

1375.

electrical instruments, 886. farm milk tank, 1344. generation of pseudo-random numbers, 1722.

glass volumetric apparatus, C602.

impact, of various alloys at low temperatures, 2819. machine for wire, recording torsion, 2435. machine, strain-gauge-type, surface tension measurements, 2794. mechanical, of solid materials, 482. operation of ball bearings submerged in liquefied gases, 3063. photographic lenses at the NBS, 1169. quick-weighing balance, 1168.

research, development, NBS, aircraft lighting, 771.

statistical principles, 1511.

thermocouples and thermocouple materials, methods

of, C590.

wholesale meters, 565.

Tests, colorfastness of textiles under consideration in the

International Organization for Standardization,

850.

diagnosis, index for rating, 71. independence, of randomness and other hypotheses,

2231. laboratory, with turboprop lubricants, 2610.

lubricants, special, 311. Tetrabromoethylene, vibrational spectrum, 1973. vibrational spectrum, properties of fluorine compounds, 1825. Tetrachloride, diboron, vibrational spectrum and force constants, 2409.

trichloride of molybdenum, preparation, J 63A2,

185. Tetrachlorohydroquinone, colorimetric determination, 670. Tetrafluorobenzenes, disubstituted 3,4,5, 6-synthesis, RP2939.

Tetrafluoromethane, heat of formation, 1533. Tetrahedron, sums of dihedral and trihedral angles, 597. Tetraiodide, titanium, heat of formation J 63A2, 161. Tetramethyl, germanium, small quantities, preparation,

517. Textile fiber structure on wear resistance effect, 610. Forschung and Prufung am NBS, 325. industry, technological challenge, 2002. research and testing at NBS, 325. research, high-speed motion pictures, 66. testing methods, standardization of, international

co-operation, 471. work, international, shows fast progress, 2164.

Textile yarns, characterization of the high-speed impact, behavior, 2909. impact absorbing capacity, 2363.

long, impacted transversely, wave propagation, 2783. rapid impact loading, 2715. rapid impact testing, RP2866.

Textiles, 188. abrasion of, interpretation of tests for resistance, 473.

at the NBS, 1529. international methods for testing colorfastness, 1375. new paper products in competition, 1784. synthetic, 845; 1522.

tests for colorfastness, 850

Textural stresses in two-phase alloys, RP2793.

Thallium, bromide iodide, refraction and dispersion, 1842. bromide, sodium chloride, and thallium chloride, photoemission from silver into, 1807.

chloride, sodium chloride, and thallium bromide, photoemission from silver into, 1807. Theorem, alternatives for pairs of matrices, 1246. convex cones, with applications to linear inequalities, 380. embedding, for balanced incomplete block designs, 948. expansion, for pseudo-analytic functions, 577. modular groups, 2016

Ostrowski and Taussky, 1091.

Riesz, M., RP2935.

Tauberian, for Abel summability, 275. transposition, on linear inequalities, two consequences,

353. Theorems, about pr(n), 2305.

basic, in matrix theory, AMS57.

minimax, 768. partially balanced designs, 1148.

structure, for modular subgroups, 1517. Tauberian, for summability (Ri), 321. Theoretical, analysis of fractionating process of adsorption, 156. electromotive forces for cells containing a single solid or molten chloride electrolyte, 1957.

investigation, terrestrial propagation of very-low- frequency radio waves, J 64D2, 153. 382
Theory, cavity ionization, 1247; 1606.

cyclic single step iteration, over and under relaxation

in, 781.

dielectric relaxation for a single-axis rotator in a

crystalline field, 1554.

diffraction in microwave interferometry, J 64B1, 1. effect of drag on the orbital inclination of an earth

satellite, RP2934.

electrochemical, fifty years, 448. electron penetration, 1548. extreme values, 3096. fading properties of a fluctuating signal imposed on

a constant signal, C599.

fast coincidence experiments, techniques, 1911. forbidden transitions of nitrogen atoms trapped in

solids, 2392. formation of polymer crystals with folded chains in dilute solution, J 64A1, 73. information, 250A.

non-linear vibrations, singular perturbation problems,

277. production of VLF noise (so-called drawn chorus) by traveling wave amplification in the exosphere

of the earth, 2003. propagation of electromagnetic waves along a curved

surface, 2673. radar scattering by the moon, J 64D3, 217.

reflection from a wire grid parallel to an interface between homogeneous media, 2238; 3010.

reflection of low- and very-low-radiofrequency waves

from the ionosphere, J 64D3, 269. stark effect of the NO molecule, 2840.

three-crystal electron interferometer, 1202. threshold energy dependence of photodetachment

of diatomic molecular negative ions, 2841. wavelength dependence on ultrahigh frequency trans- horizon propagation based on meteorological

considerations, J 64D3, 231. Thermal, analysis above 1200° C, differential, 2521.

batteries, 602. converters, 2809.

diffusion in ionized gases, 2844.

electrical conductivity of aluminum and aluminum

alloys, 2841A.

electrical conductivity of pure copper, 2841B.

electromotive force, tables of transport integrals, C595. E.M.F. of several thermometric alloys, 2833A. emf of some thermometric alloys, 2844A.

emittance at high temperatures, measuring, 3049A.

gravitational excitation of atmospheric oscillations, 1555. gravitational oscillations in the earth's upper atmosphere, 1726. hydrogen-oxygen reaction at relatively low temperatures, 345. insulating value of airspace, 1203. length changes of some refractory castables, RP2768.

photochemical processes in polystyrene in the glassy

state, 1958. Rayleigh disk in liquid helium II, 157. Rayleigh disk measurements in liquid helium II, 603. Rayleigh disk measurements in He3 -He4 mixtures,

895. resistance of airspaces and fibrous insulations bounded

by reflective surfaces, BMS151.

stress in box beams, effect of internal radiant heat

transfer, RP2949.

Thermal conductivities, common commercial aluminum

alloys, 2842. copper and copper alloys, 2393. Thermal conductivity, 1207. argon for temperatures between 0° and 75° C and at pressures up to 2500 atmospheres, 1952. beryllium oxide from 40° to 750° C, RP2775.

commercial coppers, low-temperature, 2181. determinations with guarded hot plates, 251. free-machining copper, low temperature, 1393. gas analyzer, unique, 2443.

solids at low temperatures, RP2805.

steam, 1657.

tables of transport integrals, C595. Thermal decomposition, manganous and ferrous carbonates, 1960. mass spectra, dimethylphosphinoborine trimer, 994. polymers, 1556. polymers, effect of structure, RP2860.

poly (vinyl chloride), 3099.

rate of hydrazoic acid, mass spectrometric study, RP2881. Thermal degradation, cellulosic materials, RP2853.

polyacrylonitrile, polybutadiene and copolymers of butadiene with acrylonitrile and styrene, RP2888.

polyethylene oxide and polypropylene oxides, 3100. polymers as a function of molecular structure and

branching, 1557. polymers at high temperatures, J 63A3, 261. polymers at low rates, RP2957.

polymers at temperatures up to about 800-900° C, 2843. polystrene and polyethylene, 1209. polystyrene and polyethelene in a vacuum, rates, 526. styrene and acrylate polymers in a vacuum, 811. unvulcanized and vulcanized rubber in a vacuum,

1961. Thermal expansion, 1160. silica-gypsum investiments, 1184.

tables 4f-l through 4f-6, 2336. Thermal stresses, deformation in beams, 1962. determination of loads in the presence of, 988. Thermally degraded poly (vinyl chloride) infrared spectra, RP2832.

Thermistor materials for use as temperature-sensing ele- ments in the high-velocity exhaust gases of jet- type engines, 1602. Thermochemical study of the reaction of calcium hydroxide, silica gel, and water, RP2785.

Thermochemistry and thermodynamics of substances,

1963. Thermoconductivity of tin-indium alloys in the normal

state, 2845. Thermocouple testing and materials, C590. Thermocouples, development and evaluation of ceramic

coatings, 1674. low temperatures, calibration, 2483. Thermodynamic, acidity constants, 991.

dilute solution, behavior of flexible chain molecules: polymethyl methacrylate, 687. driving force in nucleation and growth processes, 2834.

gas, functions, high-speed machine computation of, 1030. transport data, sources of transport coefficients and

correlations, 1501; 1879. Thermodynamic properties, from a heat content study,

2839. gaseous difluorodichloromethane (freon-12), 604. gaseous nitrogen, 1964. gases at high temperature: 1. Chemical equilibrium among molecules, atoms, and atomic ions considered as clusters, RP2916.

helium at low temperatures and high pressures, TN8,

(PB151367).

high temperatures: ideal gas thermal functions to 25,000 deg. K for diatomic molecules, oxygen,

nitrogen, nitrococide, and their molecule ions, 2394. nonpolar gases, generalized tables of corrections, 1721. polybutadiene-benzene, RP2820.

pure diatomic gases, effect of dissociation, 1326.

solid and liquid, triple point and heat of fusion, 1390. Thermodynamic tables, at the National Bureau of Standards, mechanized computation, 2632; 2988. Thermodynamics and thermochemistry of substances,

1963. Thermodynamics of crystallization in high polymers; gutta

percha, 1965. natural rubber, 1 558. poly (ethylene), 2846. 383
Thermoelastic solid, plane waves in, comments on a recent paper by Beresiewicz, 2058. Thermoelectric power, germanium below room temperature, 897. germanium single crystals, 896. indium antimonide, 1559.

tables of transport integrals, C595. Thermometer, bridges design of simple DC resistance, for wide-range temperature control, 2515. design of simple resistance, bridges for wide-range

control of low temperatures, 2516. Thermometers, clinical, aging changes, 385.

liquid-in-glass, calibration, C600.

resistance, 2916. Thermometric, calorimetric procedures, comparison of cryoscopic determinations of purity of benzene,

2062. study of the frozen products from the nitrogen micro- wave discharge, 2847. substance, chromic methylammonium alum, absolute temperature below 1° K, 2009. Thermometric alloys, 2833A.

thermal emf, 2844A. Thermometry, below 1° K, new materials for magnetic

cooling, 1783. low-temperature, resistance-temperature relation, 9. pyrometry, 2500. Thermoplastic materials for use as iodine vapor barriers, 2892. Thermostat, electronic, time-proportional, 939.

precision, for high temperatures, 110. Thermostated containers for standard cells, portable potentiometer, 1450. Thick target bremsstrahlung spectra for 1.00-, 1.25-, and

1.40- Mev electrons, 1211. Thickness, compressibility of fabrics, 898. gage -for ceramic coatings, 13. measurement of, C585.

Thioindigo dyes, cis-trans isomerism, 341.

sulfuric acid, absorption spectra, 342. Thiourea, urea, and some thiourea-alkali halide complexes,

infrared absorption spectra, 2160. Thoria resistor-type furnaces, construction and operation,

328. Thorium, oxide, high-density, some physical properties, 1877.

spectra, new description, Mono. 17. (Th i), a preliminary list of levels and ^-values for the

first spectrum of, J 63A3, 275. Thorium-halide lamps, wavelengths from, RP2891

Thread, screw, standardization, 1862. Threads, screw, must be everybody's business, 1977. screw, world unification, 1581. Three ways to increase efficiency of liquid scintillators, 1966. Three-crystal electron interferometer, 1202. Threshold field properties of some superconductors, 1212. Thunderstorms, distribution of electrical conduction cur- rents in the vicinity, 432.

Tile, acoustical, evaluation of adhesives, 55.

clay, moisture expansion of, 1058.

Tilting air-lubricated piston gage for pressures below onehalf inch of mercury, J 63C1, 47. Time, calibration, absolute, intermittent-action camera, J 64C2, 159. constant and response time of thermal converters, 2809.

discrete stochastic processes in arbitrary sets, with

applications to processes with absorbing regions and to the problems of loops in Markoff chains, 1286.

series of tropospheric radio field strength data, 362.

signals, standard frequency transmission, 3054A.

standard and atomic frequency, 2804. synchronization of widely separated clocks, TN22

(PB151381). Time and frequency, Hawaii, measuring, 257. standard, atomic clock, 148.

standard, new type, need for, 1190. standards in the U.S.A. from 1954 to 1957, 2550. Time standards, adjustment of high-precision frequency, NBS, atomic and molecular, 2549.

precision, 209. Time-dependent cavity characteristics, 2636. Time-proportional electronic thermostat, 939. Time-temperature behavior of rubber from measurements

of indentation hardness, 2848. Time-variable fields, stroboscopic mapping, 140. Timer, automatic, simplified small-current measurements,

2036.

Tin, crystals, gray, 2672.

iron, copper, silicon, and nickel, electrorefining studies, 2811.

isotopes of, superconductivity, 560. oxide or titania containing varying proportions or rare-earth oxides, dielectric properties, 2520.

whiskers, superconducting transitions, 1519. Tin-indium allovs in the normal state, thermoconductivity, 2845.

Tire, truck, temperature studies of air in, 1917.

Tires, commercial, measurement of treadwear, 761. power loss and temperature, J 64C1, 1. road wear, some factors influencing, 308. rubber, proof testing, 519. treadwear of, influence of type of rubber and black,

350. Titanate, barium, 3062. barium, sammarium doped, electrical properties, 2105.

Titanates, magnesium-strontium, note on the dielectric properties, 2221. Titania or tin oxide containing varying proportions or rare- earth oxides, dielectric properties, 2520. Titanium, adhesion of electroplated coatings, 1920.

alloys with dithiol, RP2812.

carbide type cermets at elevated temperatures, physical characteristics, 1445. dioxide simiconductors, electrical properties, 704.

effects of low temperatures and notch depth on the mechanical behavior of, RP2790.

6A1-4V titanium allov, nitriding phenomena, J 64A1,

119. tetrabromide, heat of formation, RP2928; RP2932.

tetraiodide, heat of formation J 63 A2, 161. titanium alloy, effect of strain-temperature history on

the tensile behavior, RP2897.

zirconium compounds in nonaqueous media, 2106. zirconium, niobium, and tantalum in steels, determination, RP2923.

Titanium-base alloys, determination of niobium and tan- talum, RP2929.

Titration, acids, differential, RP2769.

predise coulometric, of acids and bases, J 63A2, 153. Tooling, trickery, tough problems solved, 2395.

Tools, new, for research, 269.

small, a delegate reports, 2417. Tooth, human, microstructure. A. The dentioenamel

junction, 2199.

structures, X-ray diffraction studies, 1583. Top-loaded monopole antenna, earth currents near, RP2959.

Topological proofs for certain theorems on matrices with non-negative elements, 2850. Toric bending specimen for investigation of geometrical

factors in fatigue, 2442. Toroidal coils, high-frequency magnetic permeability measurements, 2584. Torsion, of a hollow square, 2385.

testing machine for wire, recording, 2435. Total-absorption X-ray spectrometry, application to beta- tron experiments, 1213. Total, collision cross sections of negative atomic iodine

ions in nitrogen and argon, 605. photoelectric cross sections of copper, molybdenum,

silver, tantalum, and gold at 662 kev, 3101. Tough problems solved with tricky tooling, 2395. 384
Townsend balance system, semiautomatic, 3044. Trade wind inversion as a transoceanic duct, J 64D3, 247.

Trailers and trucks, 3103. Transactor circuit, junction, 749. Trans-difluorodichloroethvlene, infrared and raman spectra, 2161. Transfer of liquefied gases, long distance, 2177. Transfluorodichloroethvlene, infrared and raman spectra, 2161. Transformations, integral, relations between and summation methods, J 63B1, 1. matrices, commuting and bilinear, 1654.

projective, of the Maxwell triangle, invariance of in- sidedness in, 1046. Transformer, double-slug, determination of impedance,

570. Transforms, trigonometric, 279. Transient, electromagnetic ground wave on a spherical

earth, behavior, 2386.

error, uniform, RP2879.

fields of a vertical dipole over a homogeneous curved

ground, 1967. radio waves, RP2844.

Transients in signal analysis, 1968.

Transistor, amplifier, 2586. band spotter, 899. beta tester, 2396. frequency standard, 900.

low-distortion, audio oscillator, 755.

oscillator, precision, 799. Transition region, coulomb wave functions in, 980. Transitions, indirect in indium antimonide, 1736. rotational of asymmetric rotor molecules, tables of

line strengths, 2796.

tin whiskers, superconducting, 1519. Transmission, air-borne noise through walls and floors, 2397. cesium iodide crystals, growth and infrared, 460.

error function for meteor-burst communication, 2674. 50 Mc oblique, experiment near the magnetic equator,

2626.

lines, balanced, measuring the attenuation of, 376. monoenergetic positrons and electrons, 1204. positrons and electrons, 1560. power in radio propagation, 3102.

radio at VHF by scattering and other processes in the lower ionosphere, 1469.

radio, loss vs distance and antenna height at 100 Mc,

1470. Rayleigh waves across an ocean floor with two sur- face layers, 2387.

reflection by a parallel wire grid, J 63D1, 87. reflection of electromagnetic waves in the presence

of stratified media, RP2899.

reverberant sound through double walls, 159. reverberant sound through walls, 1214. ultrasonic vibrations in metals, 2398. Transmission loss, curves for propagation at very low

radio frequencies, 2851. fading range for propagation through a turbulent atmosphere over irregular terrain, 1550. radio propagation, 901. radio propagation. II, TN12 (PB151371).

space waves propagated over irregular terrain, 606. tropospheric forward scatter propagation, TN53

(PB161554).

Transmissions, standard, low frequency, 2179. WWV standard frequency, 2871; 2872. Transmittance cesium bromide crystals, 349. infrared energy by glasses, 1561. materials in the far infrared, J 64C1, 55. reflectance of cesium iodide in the far infrared region, 2852. Transmitters, high-frequency pulse, 1056. space diversity, reception, 3033. Transparent, plastics, 1002. translucent products, 1155.

Transport, coefficients and correlations of thermody- namic and transport data, 1879. data, thermodynamic, 1501.

integrals, tables, C595.

integrals, tables of: a supplement, J 63B1, 23. phenomena in gases at high densities, contribution

to the study, 1296. processes as functions of the Heisenberg and Obukoff

theories of turbulence, 1215.

processes, statistical mechanical theory, 2778.

properties of dilute alloys of copper, 2852A.

Transportation, liquefaction of helium, 2855A.

liquefaction, technical aspects of large scale liquid helium, 2797. Transposition theorem on linear inequalities, two consequences, 353. Transulcent and transparent products, 1155. Transverse strength testing machine for denture resins, 1216. Trapped radicals, 2853. Treadwear of, commercial tires, measurement of, 761.

tires, influence of type of rubber and black, 350. Treatment of, leather with Castiloa and Hevea rubbers,

1600. leather with polyisobutylene, 607.

liquid He3 based on the "cell" model, 1562. Tree from the viewpoint of lightning, 1248. Triangular association scheme, uniqueness, 2835. Triathanolamin als puffersubstanz, 1217. Triathanolamine as a buffer substance, 1217. Triatomic nitrogen in solids at very low temperatures,

3054. Tribenzylamine oxide in benzene and water, 1195. Tribromofiuoromethane, hexafluorobenzene from the pyrolysis, 2151. Tricalcium phosphate hydrate, crystallographic investigation, 421. Trichloride and tetrachloride of molybdenum, preparation, J 63A2, 185. Triethylborane, raman spectrum, 2278.

Trifluoroethylene, 1224. Trigonometric, functions and their inverse to high accuracy, radix tables, 296. transforms, 279. Trihedral and dihedral angles, sums of, in a tetrahedron,

597. Trimethylphospine, isobutyane, and tertiary butyl fluoride, 2638. Tristimulus colorimetry, propagation of errors, 2266.

Trisulfide, arsenic, refractive index, 2726. Tritanopia with abnormally heavy ocular pigmentation,

161. Tritiated-water vapor in air, technique for monitoring,

2338. Tritium, carbon-14 for the study and characterization of

cellulose and other polysaccharides, 2403. oxide and tritium-labeled lithium borohydride, general-purpose apparatus for preparation, analysis and use of, J 63A2, 177. Tritium-labeled compounds I. Radioassay of tritiumlabeled compounds in "infinitely thick" films with a windowless, gasflow, proportional counter, J 63A2, 171.

II. General-purpose apparatus, and procedures for the preparation, analysis, and use of tritium oxide and tritium-labeled lithium borohydride, J 63A2,

177.

III. Aldoses-l-f, J 64A2, 177. Tritrations, precise coulometric, 1815. Troposphere, propagation beyond the horizon, 470. stratosphere, refractivity, 3032. Tropospheric, effects on 6-MC pulses, 2854. forward scatter propagation, TN53 (PB161554).

irregularities, radio-wave scattering by, J 63D2, 205. path, low-level, measurements of phase stability over, J 63D1, 45. radio field strength data, 362; 546

radio wave propagation, some aspects, 1872.

385
research, phase generator, 1805.

scatter propagation and atmospheric circulations, J 64D1, 81. scatter propagation measurements near the radio hori- zon, 1499.

signal characteristics in the Pacific coast region, effect of super-refractive layers, 2100. transmission loss data, TN43 (PB151402).

ultrahigh-frequency, radio link, measured statistical characteristics and narrow-band teletype message

errors on a single-sideband 600-mile long, J 64D2,

125. VHF, recording measurements of plane and circular polarized waves in the Great Lakes area, 620. wave transmission loss, TN15 (PB 15 1374). Tropospheric propagation, beyond the horizon, 351. beyond the horizon, role of partial reflections, 595. 1948-1956, TN26 (PB151385).

partial reflections, 508. point-to-point radio relaying via the scatter mode

1812. radio wave scattering in, 808. Trucks and trailers, 3103. Tubes, gas, stabilized power supplies, 1353. rotational viscous flow, 1094.

transfer, vacuum-insulated, 2406. Tubes, Bourdon, sensitivity and life data, 1864. cathode-ray, electrostatic deflection plates, J 64C2,

103. photoelectric multiplier, 27. receiving, tabulation of data, H68.

Tungsten, carbon monoxide, 2888.

helical spring balance, 162.

steels, photometric determination, RP2812. Tuning systems employing feedback amplifiers, 352. Turbidity and viscosity measurements on some cationic detergents in water and in sodium chloride

solutions, RP2778.

Turbine, hydraulic, contra-angle handpiece, 732. Turbulence, 1215.

fully developed pipe flow, structure of, 884. Turbulence-measuring equipment, development, 686. Turbulent, boundary layers with heat transfer and pressure gradient in flow direction, J 63B1, 53. flow, difussion of particles, 2929. motion, 3104.

processes as observed in boundary layer and pipe, 1218. TV and FM bands, factors affecting radio propagation,

1342. Twilight, oxygen red lines, excitation, 2554. Twinned epitaxy of copper on copper, RP2873. Two, consequences of the transposition theorem on linear

inequalities, 353. cylinders in an ideal fluid, on the motion, RP2889.

early papers on the relation between extreme values and tensile strenght, 1219.

existence theorems for systems of linear inequalities, 608.

explicit formulae for the distribution function of the sums of n uniformly distributed independent

variables, 609. forms of mathematical induction, 2855. independent variables, function generator, 1590. problems in abstract algebra connected with Horner's

rule, 1101. resistance-type hot-pressing furnaces for laboratory

use, 2399.

variables, subharmonic, harmonic, and linear, 280. Two-dimensional, nozzles by method of characteristics, design, 1432. patterns by scanning techniques, processing of, 802. Two-stage autoignition of some hydrocarbons, 354. u U236 fission product decay spectra at various times after

fission, 3105. U(IV) compounds, magnetic susceptibilities, 1396. U-type manometer, 211. 386

Uber pH-Werte nichtwasseriger losungen, 1563. den Einfluss der Gewebekonstrukcon auf den Scheuerwiderstand, 610.

die Funktionen von Gegenbauer, 1221. Ultra-high frequency, characteristics of the magnetic

attenuator, 663. directive antenna patterns, measurement of the effect of irregular terrain, 481. magnetic attenuator, 902. moon relay, 396.

oscillator attenuator, 216. transhorizon propagation based on meteorological

considerations, J 64D3, 231. tropospheric transmission loss data, TN43 (PB151402)

wide-range resonators, 357. Ultra high strength steel, new, 2215.

Ultracentrifugal, and other methods, evaluation of adhesion of organic coatings by, 715. Ultramicrotomy, problems, 309. Ultrasonic, measurements, a method for calculation, 2407. sing-around, velocimeter for liquids, 2301. switch aids diversity reception, 1564.

vibrations, characteristics, 2055. vibrations in metals, transmission, 2398. Ultraspherical polynomials, 298.

relative extrema, 106. Ultraviolet, alkaline solution of potassium chromate as a transmittance standard, 388.

far, kinetic spectroscopy, 2607. heat aging of poly (vinyl chloride), RP2863.

spectrophotometry of low pressure explosions, 1565.

visible, and infrared wave-lengths, 1035. Uncertainty of measurements, 1953. Underearth crystal resonators, 903. Underground, service, electrical measurements in the selection of bolt material, 1008. Understressing as a means of eliminating the damaging

effect of fatigue stressing, 1566. Uniform asymptotic expansions for Weber parabolic

cylinder functions of large orders, J 63B2, 131. color scales, progress report by Committee of Optical Society of America, 1459A.

transient error, RP2879. Unimodular circulants, 2057. groups, alternative proof of a theorem, 1260.

integral circulants, 1567. matrices of order two which commute, 1969. Unique thermal conductivity gas analyzer, 2443. Uniqueness theory for asymptotic expansions in general

regions, 2400. triangular association scheme, 2835.

Unit-cell data of the lead niobate P6Nb2 09 , 2401. United States planning for the large scale liquefaction and

transportation of helium, 2855A.

Units, cellular, 830. dimensions, and standards, 2088. dimensions in physics, 611. does rationalization change, 2094.

heat, and temperature scale for colorimetry, 1355. measurements, radiological, 3022. measurements, radiological, International Commission,

2366.

radioactivity, 163. Unpolarized radiant energy in the analysis of infrared absorption spectra, 1569. Unscrambling of gamma-ray scintillation spectrometer

pulse-height distributions, 2856. Unsolved problems in review, 1568. Unsteady nonlinear waves in sloping channels, 2857. Unsymmetrical range finders, cross-field error, 1300. Uranium dioxide specimens, effect of particle size on the bulk density and strength properties, 1926. Uranium-platinum system, J 64A1, 107. Urban atmospheres, interpretation of condensates from, RP2809.

Urea, thiourea, and some thiourea-alkali halide complexes,

infrared absorption spectra, 2160. two, addition compounds, analysis of dielectric loss, 2454.
U.S.A. National Committee Report, URSI subcommission 6.3, antennas and waveguides and annotated

bibliography, 3108; 2402. Use of, AC bridge to measure core loss at high induction,

1954. admixtures as integral waterproofing and dampproofing materials, 164. angular distance in estimating transmission loss and

fading range for propagation through a turbulent atmosphere over irregular terrain, 1550. carbor-14 and tritium for the study and characterization of cellulose and other polysaccharides, 2403. cesium iodide prisms to 50 microns, 1551. Chebychev polynomials in thin film computations,

J 63A3, 297. components of variance in preparing schedules for sampling of baled wool, 346. computers in statistics, 2404. continued fractions in high-speed computing, 612. current meteorological observations in radio wave,

propagation, 2331. deuterium to investigate extent of branching in polystyrene, 1220.

direct current amplifier and recorder to balance a Mueller resistance bridge, 3107.

early Balmer lines to extend the photospheric model,

2675. group divisible designs for asymmetrical factorial arrangements, 2836. nickel-aluminum alloy coatings for the protection of molybdenum from oxidation, 2837.

partially oriented solid samples and unpolarized radi- ant energy in the analysis of infrared absorption

spectra, 1569. random numbers, 613.

scintillation spectrometers in the study of continuous gamma- and X-ray spectra between 0.01 and

20 Mev, 1955.

sensitivity criterion for the comparison of the Bekk

and Sheffield smoothness testers, 1970.

statistics to determine precision of test methods, 165. subroutines on SWAC, 614. sub-routines on SEAC for numerical integrations of

differential equations and for Gaussian quadrature, 598. surface weather observation to predict the total at- mospheric bending of radio rays at small elevation

angles, 2388. sweep-frequency backscatter data for determining

oblique-incidence ionospheric characteristics, 2838. zonal constants in the calculated of beam flux, 887. Using, arc-discharge tubes in regulated low-voltage supplies, 615.

electronic computer to reduce weathering test data, 2858. mathematics for design, 355.

Utility of meteor burst for intermittent radio communication, 2389.

Utilization of observations of meterological occurrence in radio electrical propagation, 2405.

Utilizzazione delle osservazioni meterologiche correnti

nella propagation radio-electrica, 2405. V

V, fundamental of C2 F6) 888. Vacuum, high, gimbals, 1731.

needle, 848. tube, accelerometer, recent developments, 297. tube, experimental, drain casting of a high-grade magnesium oxide support used in, 996. Vacuum-insulated transfer tube, 2406.

Value, class of mean, functions, 1. Faraday, 3. Rydberg constant, 3109.

^-values for the first spectrum of thorium (Th i), a pre- liminary list of levels, J 63A3, 275. Values of physical constants of different bubbers, 1222.

Valve, cold fluids, 1570.

cutoff, heat regulator, 2146.

needle, improved stainless steel, 1034.

seal-off, high vacuum, 919. Van Rhijn method, height of the nightglow, 1534. Vanadium, radiative orbital electron capture, 1835. Vapor, gallium, mass spectrum of, 758. phase ortho-para conversion in the large CEL-NBS

hydrogen liquefier, 2859. water, millimeter wavelength dispersion of, 767. water, permeability of leather, 57. water, rotational intensity distributions of OH and OD in electrodelen discharge through, 817. Vapor pressure, benzene above 100° C, 616. He '-He4 mixtures, 599. helium, scale of temperature, 1535.

saturation, of liquid helium in the range 1.4°—4.2° K,

measurements, 1403. Vapor pressures, deuteromethanes, 889. some hydrocarbons in the liquid and solid state at low temperatures, TN4 (PB151363). Vapors and gases on glass spheres, adsorption, 1609.

Variability, in a process, technique for locating source, 323. wool content in part wool blankets, 1571. Variable capacitor calibration with an inductive voltage

divider bridge, TN57 (PB161558).

Variable, heart pump permitting independent control of

rate, output, and ejection velocity, 381. lenght re-entrant cavity for dielectric measurements

from 100 to 400 Mc, 638. Variables, two independent, function generator, 1590.

Variation, determinant of a positive definite matrix, 284.

distortion with magnification, 1572.

elastic constants and static strains with hydrostatic

pressure: a method for calculation from ultrasonic measurements, 2407. frequency of the signal range of FM and television broadcasting stations, 347. intensity of fast cosmic-ray neutrons with altitude, 600. physical and chemical properties of split and unsplit chrome-tanned leather, 601. spectrum of a normal matrix, 890. synoptic, of the radio refractive index, J 63D1, 91. Variational, calculation of scattering cross sections, 617.

principles for the acoustic field, 1223. Variations, calculus of, elementary introduction, 23. gamma cassiopeiae, TN21 (PB151380).

physical and chemical properties within and between

vegetable retanned cow and steer sides, 618. preferred orientation and modulus of elasticity in cold drawn music spring wire, 1573. surface tension with body and surface concentrations, 3110.

Veatchite, 3057.

Vector, double stochastic transforms, 2658. measures, relations among certain ranges, 299. Vectors, constant, plus a Rayleigh-distributed, mean

absolute value and standard deviation of the

phase, RP2950.

symmetric matrix, 192. Vegetable extract blends, lignolsulfonates 1979.

Vehicles, space, coatings for, 2910A.

Velocimeter, sing-around ultrasonic for liquids, 2301.

Velocities, burning, measurement of, 1064.

Velocity, light from the molecular constants of carbon monoxide, 1574. measurements below 1° K, 822. meter, bar magnet, 174. Venting and drainage, problems, 289.

Ventricle, mechanical left, method for the study of the

circulation in the dog, 920

Ventricular, right, failure in dogs maintained with an

extracorporeal left ventricle, 1685.

Versatile, core bozes, 619. goniometer for projection photometry, 904. pneumatic instrument based on critical flow, 14. Vertical distribution of light from gas-filled candlepower

standards, 2860. 387
Vertical-incidence, ionosphere sounding at the National Bureau of Standards, TN28 (PB151387).

scatter from the ionosphere at 41 Mc/sec, observation, 2655. VHF band, cosmic radio noise intensities, 418.

field-intensity meters, 739.

field-intensity standards, development, 427. forward scatter and the lower oinosphere, 2759.

intensity meters, 151. ionospheric propagation, regular, 1495. ionospheric scatter circuit during the solar event

of February 23, 1956, field-strength variations recorded, 2121. ionospheric scatter communication, 1958 critique, 2505 A. ionospheric scattering, frequency dependence, TN9

(PB151368).

ionospheric scattering, modulation studies, 2639A. match meter, 15. microwave matching termination, 637. oblique incidence circuits, 2773.

off-path propagation, 2656. propagation by ionospheric scattering-survey of ex- perimental results, 1971. propagation measurements in the Rocky Mountain

region, 1972. propagation over irregular terrain, 1663. radio transmission at, by scattering and other processes in the lower ionosphere, 1469. radio waves, oblique-incidence measurements of the

heights at which ionospheric scattering occurs, 1790.

region, permeability measurements, cavity techniques, 1283.

scatter propagation, high-gain antennas, 1729. scatter research program for the I.G.Y., NBS equatorial region, 2209. transmission by scattering from the lower ionosphere, extreme useful range, 2560. transmission in North America, effect of Sporadic

E, 3074. transmission loss, 750; 870; 1384. tropospheric recording measurements of plane and

circular polarized waves in the Great Lakes

area, 620. UHF directive antenna patterns, measurement of the effect of irregular terrain, 481. UHF tropospheric transmission loss data, TN43

(PB151402). UHF wide-range resonators, 357. VLF, antenna for investigating the ionosphere with hori- zontally polarized radio waves, J 64D1, 27. atmospheric noise, 2351. atmospheric radio noise, 2188. emissions generated in the earth's exosphere, 3097.

emissions, origin of, J 63D1, 21.

field strength data, study, 2438. ionospheric propagation, 2203; 2234; 2456; 2390. ionospheric propagation for finite ground conductivity, mode theory, 2373. ionospheric reflection coefficients at, from sferics measurements, 2172. measurement of ground conductivity, 2670. monopole antenna with a radial wire ground system,

2437.

noise investigation, by the NBS, 2217.

noise, theory of production, 2003. papers, introduction, 2165. propagation, multiple reflections between the earth and ionosphere, 1781. propagation using atmospheric waveforms, some characteristics, 2760.

pulses, propagation of, to great distances, RP2898.

radiation spectra of lightning discharges, J 63D2, 199. radio waves, frequency characteristics, 2345. radio waves, propagation, TN58 (PB161559).

radio waves, waveguide mode theory, 2391. sky wave propagation, geometrical optics, 2360.

Very low temperature, an experimental study of the

strength and fatigue of glass, 2014. data: properties of paramagnetic salts, 2408.

Vessel, cylindrical, conductivity of a fluid contained in, measurement, 2233. Vibrating systems, decay constant in, 678. Vibration, measurement, developments, 1492. measurement, stroboscopic interferometer, 2784. problem with arbitrary damping and restoring forces, 2145. square clamped plates, 1435. stroboscopic analyzer, J 63C2, 97. suspended chain, modes of, 770. thin elastic plates with free edges, RP2784.

wind-induced, of telephone and distribution conductors, 2868. Vibration-rotation, bands of ammonia, 2411; 2862. bands of ammonia: 1. The combination bands

"2-("u "s), RP2894.

spectrum of D O, 891. spectrum of HDO, 892. structure in absorption bands for the calibration spectrometers from 2 to 16 microns, J 64A1, 29; Mono. 16. Vibrational, energy exchange between diatomic molecules and a surface, 2861. energy of deuterium cyanide, 1575. equilibrium distribution reactant molecules by chemical reactions, 2671. nonequilibrium distributions, relaxation, 1847; 2235

2324; 2786.

relaxation data in shock wave experiments, 2896. relaxation of a system of anharmonic oscillators, 2786. Vibrational spectra, n-dimenthylaminodiborane, 1205. trifluorethylene and trifluorethylene-d, 1224. Vibrational spectrum, bromotrifluoroethylene, 1206. chlorotrifluoroethylene, 893. fluorotrichloroethylene, 1577.

1-fluoro-l chloroethylene, 1576.

force constants of diboron tetrachloride, 2409. structure in the ionization efficiency curves of hydro- gen and deuterium molecules, 2410. tetrabromoethylene, 1825; 1973. Vibrational-rotational bands of deuterated methanes, J

63A2, 145. Vibrations, stretching and inversion in ammonia, interaction, 1744.

ultrasonic, characteristics, 2055.

ultrasonic in metals, transmission, 2398. Video signals on coaxial cables, 2300. Vincent's theorem, note, 96. Viscoelastic, linear, behavior, proposed nomenclature,

2271. media, interfacial waves, 1745. phenomena in amorphous high polymeric systems,

2863. rubber in shear, nonlinear, 1419.

Viscoelasticity, linear, theory: delta-function approximations, 956. Viscometer, Mooney, 1164; 1409. semi-micro dilution, 1245. Viscometric and turbidimetric measurements on dilute aqueous solutions of a nonionic detergent, 1225. Viscometry, capillary, 2047A.

Viscose and cotton rayon, 973.

Viscosities, higher, grease consistometer is modified to operate at constant shear rates, 245. sucrose solutions at various temperatures: tables of recalculated values, C440 Suppl. very dilute polymer solutions, 166. 0.25 to 90 percent GR-S rubber solutions, 621.

Viscosity, density and electrical resistivity of molten alkaline-earth borate glasses with three mole percent

of potassium oxide, 2864.

electrical resistivity of molten alkali borates, 907. exhaust-gas mixtures at elevated temperatures, deter- mination of 989. expansivity and density, molten alkali silicates, 422.

388
intrinsic, graphical method for single-point determination, 1235. methods to the study of branching in polsaccharides, application of, 654. Moonev, 740. n-hexadecane, RP2912.

non-Newtonian, 849.

specific heat, enthalpy, entropy, free energy function, and thermal conductivity of steam, compressibility factor, density, 1657. thermal conductivity, and Prandtl number for air, 0., N,( NO, H2 /CO, C02) HA He and A, 1207. turbidity measurements of some cationic detergents

in water and sodium chloride solutions, RP2778.

Viscosity-molecular, intrinsic, weight relationships for

" dextran, 745.

Visible, ultraviolet, and infrared wavelengths, 1035.

Vision, color and colorimetry, 2500.

color-defective and normal, according to the three- components theory, entroptic color-perceptions

of the macular pigment by observers, 1706. Voltage, breakdown tester, 908. divider bridge, inductive, TN57 (PB 161558).

electronic, regulator, 135.

error, detector, broadband, 914. low, regulator, 364.

ratio at audio frequencies, measurement, 2191.

Visual auroral observations, 2412. Vitreous coatings to stainless steel, adherence of, influence

of copper ions, 1737. Vitro production of experimental enamel caries, 1734. Vitron, noncrystal ionic model for silica glass, RP2782.

Vitrons in alkali silicate binary glasses, RP2854.

Volcanoes on the moon, 3111. Voltmeter, RF, calibrating consoles, 2747. Volume, changes in small concrete cylinders during freez- ing and thawing, 167. temperature relations of amorphous polymers over an extended temperature range, 1975. Volume-temperature relationships for the room temperature transition in teflon, 356. Volumetric apparatus, glass, testing, C602. VTM circuits, 168. Vulcanizates, electrical resistance, 408. pure-gum rubber, 2534. rubber, determination of sulfur, 1311. Vulcanization, characteristics of natural rubber, 909. natural rubber, infrared study of structural changes, RP2816. w WBir for plonium-210 alpha particles, absolute measurement, 2444.

sulfur-35 beta-rays, measurement, 1769. Wall, effects on rotational population of OH2 S+, 2865.

floor, and door constructions, sound insulation, BMS144, 2d Suppl.

material, cavity ionization as a function of, RP2842.

Walls, double, reverberant sound, 158.

floors, transmission of airborne noise, 2397. radiographic rooms, dose, 1319. War games, analytic study, 1264. Washington area scientists-for-teachers program, 1956. Water, a thermochemical study of the reaction of, RP2785.

content in Freon-12, circulating in a refrigeration system, determination of, 990. current meters, rating, 340. demand rates for electric drinking-water coolers of the bubbler type, 1226. deuterated, vapor, rotation-vibration spectra, 1949. dose distributions in, for betatron X-rays to 37 Mev,

studies, 1904. dose measurements, using scintillation and ionization

detectors, 995.

effect of dissolved air on the speed of sound, 1686. evaporation, from cellulose, 547. freezing of, in pipes and vessels, 861.

jets, steam driven, for propulsion purposes, RP2830.

liquid, infrared absorption, from 2 to 42 microns, 1038.

nitrogen, oxygen, and ammonia, electric discharge, 2309.

porcelain enameled hot, tanks, 2745.

release, effect on the free outflow hydrometer, J 63B2,

117. speed of sound in, near the turning point, temperature

coefficient, 1914. speed of sound, tables, 3061.

storage, analytical integration of the differential equation, J 63B1, 43.

tritiated, vapor in air, technique for monitoring, 2338. Water vapor, determination from the change in electrical resistance of a hygroscopic film, RP2864.

deuterated, rotation-vibration spectra, 1859.

dielectric constant, 431. influence of temperature on the absorption, by colla- gen and leather, 74. millimeter wavelength dispersion of, 767. oxygen absorption of radio waves in the atmosphere,

2241. permeability of leather, 57.

rainfall, statistics, microwave attenuation, 88. rotational intensity distributions of OH and OD in electrodelen discharge through, 817. Water-soluble degradation products of asphalts, 2413. Water-vapor and nitrogen adsorption, determination of surface area of hydrated portland cement by, RP2806.

Waterdrops, fragmentation in the zone behind an air shock, RP2843.

Waterproofing and dampproofing materials, 164. Watson's lemma, modification, J 63B1, 15. Watthour-meter test, 1049. Wave action in diffusers for exhaust-pipe systems, with

special reference to the scavenging of two-stroke

engines, 1679. Wave-frequency dependence of the duration of radar-type

echoes from meteor trails, 348. Wave, function, Coulomb, by means of recurrence relations, generation, 1532.

pulse, spherical, by a half plane screen, diffraction, 2086.

radio, bending from normal, calculation of the departures, J 64D3, 259. transient ground, note on the propagation, 1992. transmission loss, tropospheric, TN15 (PB151374). Wave propagation, 1147.

anisotropic, inhomogeneous medium, 910. breaking velocities, strain energies, and theory neglecting, 1277. inhomogeneous medium, 629.

iosopheric, 67. irregular surface, integral equation approach to the problem, 394. long textile yarns impacted transversely, RP2866.

tropospheric radio, some aspects, 1872. Waveform of a radio atmosphere at short ranges, 1800. Waveguide components, millimeter wavelengths, precision, 2339. millimeter-wavelength range, electroforming of, C587. mode theory of the propagation of VLF radio waves,

2391. mode theory of VLF ionospheric propagation, 2390.

rectangular, adjustable sliding termination, 2012. rectangular, half-round inductive obstacles, J 64B2,

113. termination, reflectionless, 183. Waveguides and antennas, 2402; 2897. Wavelength, dependence in ultrahigh frequency trans- horizon propagation based on meteorological

considerations, J 64D3, 231. dispersion of water vapor millimeter, 767.

shifters and oxygen quenching in liquid scintillators, 1439. Wavelengths from thorium-halide lamps, RP2891. Wavenumbers, tables of, Mono. 3, Vol. I and Vol. II. Waves, electromagnetic, along a curved surface, theory of propagation, 2673.

interfacial between two streams, 1632. 389
interfacial in vlscoelastic media, 1745.

light and length standards, 1387.

long, propagation, 2721.

nonlinear, in sloping channels, unsteady, 2857.

pulses, on the diffraction and reflection of, by wedges and corners, RP2906.

radio, atmospheric bending, 2806.

radio, penetrating the ionosphere, 2458. scattered radio, some meteorological effects, 1874.

surface, on plane and curved impedance boundaries,

excitation, 2553. three-centimeter radio, single path phase measuring

system, 2758. Wax batteries, 2866. Wear prevention, 59. Weather data distribution, how FM expedites: fax and

telemetering, 69. Weatherability of porcelain enamels, 1578. Weathering, certain mortars exposed in brick masonry with and without caps and flashings, effects, 1927. porcelain enamel, 157. relation between actual and artificial, 2729.

test data, using an electronic computer to reduce, 2858. Weber parabolic cylinder functions of large orders, uniform

asymptotic expansions. J 63B2, 131. Wedges and corners on the diffraction and reflection of waves and pulses by, RP2906.

Weibull distribution, moments of order statistics, 1428. Weight, intrinsic viscosity-molecular, 745. molecular in polymer methacrylate, fracture phenomena, 2569. molecular, on the crazing and tensile properties of polymethyl methacrylate, effect of, 999. piston gage, 2103. Weighted, compounding of two independent significance

tests, 3098.

restricted partitions, 3112. Weights, atomic, 127. 1956-57, report, 2731. report of the committee of the American Chemical

Society, 531; 1129. Weights and measures, administration in the U.S., 1976. administration, NBS and state, 485. approval scale, 1580. checking prepackaged commodities, H67.

federal basis for, C593.

National Conferences:

Forty-second, 1957, M222

Forty-third, 1958, M225

Forty-fourth, 1959, M228

National Conference Reports, (See National Conference on Weights and Measures),

officials and manufacturers, genuine cooperation, 458. training program, 182. Weiner's integrals in function space, 185. Welded ships, investigation of structural failures, 746. What is the heat pump? 1227. use is spectroscopy? 622. Whistlers, some properties of lightning impulses which

produce, 2764. Whittaker functions, Jacobi polynomials, certain series expansions involving, 1424. product of two, Neumann series, 630. Why screw threads must be everybody's business, 1977. Wide-band FM adapter reduces interference, 169. Wide-range, calibrator for vibration pickups, 911. cryostat temperature control, 3113. decade frequency generator, 170. R-C oscillator, 171. resonators for VHF and UHF, 357. Wilson quotients and the third Wilson prime, table, 636. Wind, load requirements, new standard, 2214.

pressures in various areas of the United States, BMS152.

trade, inversion as a transoceanic duct, J 64D3, 247. Wind-induced vibration of telephone and distribution conductors, 2868.

Winds, aloft, radio measurement, 524. ionospheric, systematic, 319. Wings, delta, structural analysis and influence coefficients

for, 840. Wire, buried, ground systems, calculations of transverse I current loss, 2665. cold drawn music, crystallography, 2509. endurance of helical springs related to properties of, I 710. grid parallel to a dielectric interface, impedance, 2364.

grid parallel to an interface between homogeneous I media, theory of reflection, 2238.

length, minimum total, formal procedures for con- I necting terminals, 2128. magnets, Cunife, RP2808.

music spring, cold drawn, 1573. recording torsion testing machine, 2435.

resistance strain gages, cryogenic characteristics, I 2073.

strain gages, 2950. Wireless microphone uses F-M modulation, 2869. Wires, copper, measurement of the resistance-strain rela- m

tion and Poisson's ratio, 1768.

line, pretied tie for communication, 2432. Wood, baled, use of components of variance in preparing I schedules for sampling, 346. cotton, and nylon fabrics at different temperatures and relative humidities, 2793. Wool content in part wool blankets, variability, 1571. World maps of f2 critical frequencies and maximum usable frequency factors, TN2 (PB151361).

unification of screw threads, 1581. World-wide, ionospheric soundings, first report of the |0 special committee, 1712. soundings committee: Memorandum 17—Future work,

2870. standard frequency broadcast reception, 623. standard frequency broadcasting station, the power

requirements and choice of an optimum frequencv

for, J 63D1, 35. WWV, standard frequency transmissions, 2871; 2872. standard frequency station, 42. X

X- and 7-ray dosimetry, stabilization film processing, 1891. gamma-rays, photographic dosimetry, 2611. X-band, ceramic, cavity resonators, 2561.

oscillator stabilization, high-order harmonics, 2153. 1 X-radiation in the range from 30 kev to beyond 1 Mev,

photographic personnel dosimeter, 1994. X-ray, absorption spectra, 1655. attenuation coefficients from 10 kev to 100 Mev, C583 Suppl. attenuation in lead, aluminum, and concrete in the range 275 to 525 kilovolts, 1582. beam, 1400 kv, calorimetric determination of the power, 2047.

calibration of radiation survey meters, pocket chambers and dosimeters, 172. dental, film, 2091. dental machine, panoramic, 1993.

diffraction, crystal structure of anhydrous indium

phosphate and thallic phosphate, 1667.

diffraction powder patterns, standard, C539, Vols. 7, 8, 9. diffraction studies of tooth structures, 1583. equipment, military field, 483. exposure, dental, radiation data during, ionization chambers, 1380. gamma-spectra between 0.0; and 20 Mev, 1955. low-angle, diffraction of fibrous polyethylene, 2616. low-temperature, studies on Rice's blue material, 2979. microscope, field emitter point projection, 1982. photons, 1136. spectrometry, 1213. standards, comparison, 916; 1230. study of textural stresses in two-phase alloys, RP2793.

tube, high voltage, 224. 390
X-rays betatron, 961. betatron, to 37 Mev, studies of dose distributions in water, 1904. concrete and lead, attenuation of 86- and 176-Mev

synchrotron, 1635A. gamma-rays, absorption by concrete, 1250. hard, penetration and diffusion of: polarization effects, high-energy, 1150; 2741. low energy, standard free-air chamber for measure- ment, J 64C1, 49. nuclear absorption and elastic scattering, direct observations, 1312. penetration and diffusion, 509. reciprocity law, 1838; 1839. scattered by C12

, parameters of the 15-Mev, 1803. scattered in lead, energy and angular distribution, 2111.

scintillation crystal-TV, 1484. synchrotron, 1135. Y

Yarns, from different fibers, impact properties, 734.

stress-strain relationships in, RP2866.

stress-strain relationships, subjected to rapid impact

loading, 1899; 2783. subjected to rapid impact loading, stress-strain, 1514;

1515; 1516. tested at rates of straining up to a million percent

per minute, stress-strain relationship, 1900.

textile, high-speed impact behavior, 2909.

textile, impact absorbing capacity, 2363.

textile, rapid impact loading, 2715. Yohimbine hydrochloride, crystallographic data, 2508. Young's modulus, flexural and longitudinal resonance

frequencies of uniform bars, comparison of ex- perimental and theoretical relations, J 64A2, 147. ious refractory materials as a function of temperature, 3114.

Yttrium iron garnet, spectra, 2966.

Zeeman data, supplementary, for the first spectrum of ruthenium (Ru i), J 63A3, 253. Zeeman effect, 1584.

first spectrum of hafnium, 1208. spark lines of ruthenium, 1228. Zeeman-split absorption lines as very narrow pass filters, 3115. Zero pressure gradient, characteristics of turbulence in a boundary layer, 968.

Zeros, certain polynomials, J 63B1, 21. certain polynomials, J 63B1, 21. derivative of Bessel functions of fractional order, 912.

I n+1 OE)Jn(x)+J„+.(z)In(x), 624. polynomials and the degree of linear systems, 790. Zeta functions, Lerch, 1798.

Zinc, blend lattices, ionic character and elastic moduli,

2367.

boroxilicate glasses, properties, RP2930.

phosphate and silicate cements, 2873.

point, temperature, 2799.

sulfide, high frequency induced electroluminescence,

1728.

Zirconia, alumina shapes, 173. reactions in binary oxide systems, 1978. Zirconium, extension of the second spectrum, into the

infrared, 717.

five compositions of zirconium hydride, heat content

of from 0° to 900° C, RP2878.

titanium compounds in nonaqueous media, 2106. niobium, titanium, and tantalum in steels, deter- mination, RP2923.

Zirconium-hydrogen system: some thermodynamic properties from a heat content study, 2839. Zone, auroral absorption, location of, 1054.

391

U.S. GOVERNMENT PRINTING OFFICE:1961 O—569918

U.S. DEPARTMENT OF COMMERCE

Luther H. Hodges, Secretary NATIONAL RUREAU OF STANDARDS

A. V. Astin, Director THE NATIONAL BUREAU OF STANDARDS

The scope of activities of the National Bureau of Standards at its major laboratories in Washington, D.C., and Boulder, Colo.,

s suggested in the following listing of the divisions and sections engaged in technical work. In general, each section carries out

Specialized research, development, and engineering in the field indicated by its title. A brief description of the activities, and of the resultant publications, appears on the inside of the front cover. WASHINGTON, D.C. ELECTRICITY. Resistance and Reactance. Electrochemistry. Electrical Instruments. Magnetic Measurements.

Dielectrics. METROLOGY. Photometry and Colorimetry. Refractometry. Photographic Research. Length. Engineering Metrology. Mass and Scale. Volumetry and Densimetry. HEAT. Temperature Physics. Heat Measurements. Cryogenic Physics. Equation of State. Statistical Physics. RADLVTION PHYSICS. X-Ray. Radioactivity. Radiation Theory. High Energy Radiation. Radiological Equipment.

Nucleonic Instrumentation. Neutron Physics,

j ANALYTICAL AND INORGANIC CHEMISTRY. Pure Substances. Spectrochemistry. Solution Chemistry. Analytical Chemistry. Inorganic Chemistry. MECHANICS. Sound. Pressure and Vacuum. Fluid Mechanics. Engineering Mechanics. Rheology. Combustion ORGANIC AND FIBROUS MATERIALS. Rubber. Textiles. Paper. Leather. Testing and Specifications. Polymer

Structure. Plastics. Dental Research. METALLURGY. Thermal Metallurgy. Chemical Metallurgy. Mechanical Metallurgy. Corrosion. Metal Physics,

i Electrodeposition.

I MINERAL PRODUCTS. Engineering Ceramics. Glass. Refractories. Enameled Metals. Crystal Growth. Constitution

i BUILDING RESEARCH. Structural Engineering. Fire Research. Mechanical Systems. Organic Building Materials.

1 Codes and Safety Standards. Heat Transfer. Inorganic Building Materials. APPLIED MATHEMATICS. Numerical Analysis. Computation. Statistical Engineering. Mathematical Physics. DATA PROCESSING SYSTEMS. Components and Techniques. Digital Circuitry. Digital Systems. Analog Systems.

I Applications Engineering. ATOMIC PHYSICS. Spectroscopy. Radiometry. Solid State Physics. Electron Physics. Atomic Physics.

I INSTRUMENTATION. Engineering Electronics. Electron Devices. Electronic Instrumentation. Mechanical Instruments.

I Basic Instrumentation.

{ PHYSICAL CHEMISTRY. Thermochemistry. Surface Chemistry. Organic Chemistry. Molecular Spectroscopy.

| Molecular Kinetics. Mass Spectrometry. Molecular Structure and Radiation Chemistry.

| • Office of Weights and Measures,

j BOULDER, COLO. CRYOGENIC ENGINEERING. Cryogenic Equipment. Cryogenic Processes. Properties of Materials. Gas Liquefaction. IONOSPHERE RESEARCH AND PROPAGATION. Low Frequency and Very Low Frequency Research. Ionosphere

Research. Prediction Services. Sun-Earth Relationships. Field Engineering. Radio Warning Services. RADIO PROPAGATION ENGINEERING. Data Reduction Instrumentation. Radio Noise. Tropospheric Measurements. Tropospheric Analysis. Propagation-Terrain Effects. Radio-Meteorology. Lower Atmosphere Physics. RADIO STANDARDS. High Frequency Electrical Standards. Radio Broadcast Service. Radio and Microwave Materials. Atomic Frequency and Time Interval Standards. Electronic Calibration Center. Millimeter-Wave Research. Microwave

Circuit Standards.

| RADIO SYSTEMS. High Frequency and Very High Frequency Research. Modulation Research. Antenna Research.

I Navigation Systems. Space Telecommunications.

\ UPPER ATMOSPHERE AND SPACE PHYSICS. Upper Atmosphere and Plasma Physics. Ionosphere and Exosphere

| Scatter. Airglow and Aurora. Ionospheric Radio Astronomy.