Fuel-Steam Calculator Circular Slide Rule for Norfolk & Western Railway, invented by Fred Q. Saunders
date: label: date made
content: 1943-1959
name: label: maker
content: Whitehead & Hoag Company
notes: label: Description
content: This two-sided white plastic circular slide rule helped railroad procurement officers determine the amount and cost of coal or oil needed to efficiently operate the boiler of a train engine. It consists of three concentric discs, with the two smaller discs on the front and back and one large disc in the middle. The metal fastener holding the discs together is tarnished. On the front, the outer edge of the large disc bears an evenly-divided scale for "Fuel Cost per Million Btu's and Steam Cost per 1000 lbs." The smaller disc has scales for coal cost per ton/oil cost per gallon, BTUs per pound, and evaporation for a high viscosity of fuel. A bell-shaped indicator has a scale for the weight of oil in pounds per gallon.
label: Description
content: On the back of the instrument, from the outside in, there are scales and windows for reading the feed water temperature (in degrees Fahrenheit), difference in height (in BTUs per pound), steam pressure (in pounds per square inch), boiler efficiency, the heat value of fuel (in BTUs per pound), a boiler at high pressure, the factor of evaporation and equivalent evaporation, saturated steam pressure (in degrees Fahrenheit), and steam pressure (in pounds per square inch). There is a hairline indicator. The instrument fits into a black leather case.
label: Description
content: The front of the device is marked: FRED Q. SAUNDERS (/) RICHMOND, VIRGINIA; FUEL-STEAM CALCULATOR; PAT. 2,328,881. The indicator on the front is marked: N & W (/) Ry. (/) CARRIER OF (/) FUEL SATISFACTION. This is the logo for the Norfolk & Western Railway, which transported coal east from the Pocahontas Coal and Coke Company in the Appalachian mountains. N&W was a relatively small railroad with a significant role in American transportation in the 19th and 20th centuries. It expanded into other activities in 1964 by merging with several other railroads; around this time, it also completed the transition from steam-powered to diesel locomotives. In 1998, the company was merged into Norfolk Southern Corporation.
label: Description
content: Inside one of the windows on the back of the instrument is marked: 459; WHITEHEAD-HOAG, NEWARK, N.J. Founded in 1892 and in business until 1959, Whitehead and Hoag was a major producer of paper and plastic advertising novelties. Headquartered in Newark, it had branch offices in about thirty cities around the world. For other slide rules made by this company, see 1987.0221.02 and those described by the MIT Museum and Dick Rose's Catalog for Vintage Instruments (October 2000) at their web sites.
label: Description
content: Besides his patent on this device, Fred Q. Saunders of Richmond, Va., copyrighted a "Fuel Steam Calculator Manual" on July 2, 1945 (cit. no. 21463). In 1952, he received patent no. 2,763,873 for a portable, collapsible bath tub to be used on hospital beds.
label: Description
content: References: Fred Q. Saunders, "Fuel Engineer's Calculator" (U.S. Patent 2,328,881 issued September 7, 1943); Library of Congress Copyright Office, <i>Catalog of Copyright Entries: Part 1, Books, Group 2, Pamphlets, Etc.</i>, new ser. 42 (1945): 397; Mason Y. Cooper, "An Introduction to the Norfolk & Western Railway," Norfolk & Western Historical Society, http://www.nwhs.org/about_nw.html; Thomas W. Dixon, Jr., <i>Appalachian Coal Mines & Railroads</i> (Lynchburg, Va.: TLC Publishing, Inc., 1994); Joseph T. Lambie, <i>From Mine to Market: The History of Coal Transportation on the Norfolk and Western Railway</i> (New York: New York University Press, 1954); "Whitehead and Hoag Collection," Nehushtan Antiques, http://www.nehushtanantiques.com/whitehead_and_hoag.html.
label: Location
content: Currently not on view
place: label: place made
content: United States: New Jersey, Newark
topic: label: Subject
content: Patented
label: Subject
content: Rule, Calculating
label: Subject
content: Railroads
label: Subject
content: Mathematics
setName: label: See more items in
content: Medicine and Science: Mathematics
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content: Science & Mathematics
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content: Slide Rules
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 1984.1080.01
label: accession number
content: 1984.1080
label: catalog number
content: 1984.1080.01
objectType: label: Object Name
content: slide rule
physicalDescription: label: Physical Description
content: plastic (overall material)
label: Physical Description
content: metal (part material)
label: Measurements
content: overall: 15.3 cm x 15.3 cm x .9 cm; 6 1/32 in x 6 1/32 in x 11/32 in