Instruction Manual for Keuffel & Esser Polyphase Duplex Pocket Slide Rule

Instruction Manual for Keuffel & Esser Polyphase Duplex Pocket Slide Rule

Usage conditions apply
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.
place made
United States: New York, New York City
Physical Description
paper (overall material)
overall: 19.8 cm x 13.4 cm; 7 25/32 in x 5 9/32 in
ID Number
accession number
catalog number
Credit Line
Gift of Alfred E. Brown
Rule, Calculating
See more items in
Medicine and Science: Mathematics
Science & Mathematics
Slide Rules
Data Source
National Museum of American History
Nominate this object for photography.   

Our collection database is a work in progress. We may update this record based on further research and review. Learn more about our approach to sharing our collection online.

If you would like to know how you can use content on this page, see the Smithsonian's Terms of Use. If you need to request an image for publication or other use, please visit Rights and Reproductions.


Add a comment about this object