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slide rule, chemical

slide rule, chemical

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