Chemical Slide Rule
date: label: date made
content: after 1933
name: label: maker
content: Keuffel & Esser Co.
notes: label: Description
content: Chemical slide rule designed by Raymond Harmon Ashley (ca. 1895-), a chemist teaching at the University of Maine. The form was available by 1914, and said to be suitable for all the computations that would be carried out by a chemist or a chemical engineer.
label: Description
content: Inscriptions on this example read "KEUFFEL & ESSER CO. N.Y." AND "PAT. 1,930,852" AND "MADE IN U.S.A."
label: Description
content: Ref: R. Harmon Ashley, <i>The Chemist’s Duplex Slide Rule</i> (New York, 1923).
label: Description
content: Adolf W. Keuffel, "Slide Rule," U.S. Patent 1,930,852 (Oct. 17, 1933).
label: Location
content: Currently not on view
place: label: place made
content: United States
setName: label: See more items in
content: Medicine and Science: Chemistry
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: CH.337236
label: catalog number
content: 337236
label: accession number
content: 1979.0768
label: patent number
content: 1,930,852
objectType: label: Object Name
content: Slide Rule, Chemical
physicalDescription: label: Measurements
content: overall: 320 mm x 51 mm x 12 mm; 12 5/8 in x 2 in x 1/2 in
label: Measurements
content: overall: 12 1/2 in x 2 in x 7/16 in; 31.75 cm x 5.08 cm x 1.11125 cm