Instruction Manual for Keuffel & Esser Polyphase Duplex Pocket Slide Rule

This 70-page booklet was received with 1993.0357.01. The book explains how to operate model 68–1555, which was model 4168 before 1962. Its citation information is: Keuffel & Esser Polyphase Duplex Pocket Slide Rule . . . Instruction Manual, 2nd ed. (New York: Keuffel & Esser Co., 1947). Presumably only the cover and illustration of the slide rule were updated in the 1960s. Topics covered include: multiplication and division, proportion, squares and square roots and cubes and cube roots, and plane trigonometry. Answers are provided at the back.
Currently not on view
Object Name
date made
Keuffel & Esser Co.
Physical Description
paper (overall material)
overall: 19.8 cm x 13.4 cm; 7 25/32 in x 5 9/32 in
place made
United States: New York, New York
ID Number
accession number
catalog number
Slide Rules
Science & Mathematics
Rule, Calculating
See more items in
Medicine and Science: Mathematics
Slide Rules
Data Source
National Museum of American History, Kenneth E. Behring Center
Credit Line
Gift of Alfred E. Brown

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