Keuffel & Esser Log Log Duplex Decitrig Slide Rule Documentation


This green softcover instruction manual, advertising pamphlet for various pocket-sized Keuffel & Esser slide rules, and leaflet on "How to Take Care of Your Slide Rule" were received with 2007.0181.01. The citation information for the manual is: Lyman M. Kells, Willis F. Kern, and James R. Bland, Slide Rule Manual: Log Log Duplex Decitrig, 4th ed. (New York: Keuffel & Esser Co., 1955). Kells, Kern, and Bland were all mathematics professors at the U.S. Naval Academy. The cover indicates that the manual is model "No. 68 2047 (/) OLD NO. 4187S," suggesting it was printed after 1962, when K&E changed all of its model numbers. The 125-page manual is designed for self-study and covers multiplication and division; proportion; squares, cubes, and roots; trigonometry; the log log scales; and logarithms and the slide rule. Answers to the exercises are in the back of the manual. See also 1987.0085.02.

The pamphlet is marked with the motto: calculate wherever you circulate. It measures 2-1/4 X 8-1/4 inches and was copyrighted in 1960, 1962, and 1964. Information is provided for five-inch versions of K&E's Deci-Lon, Jet-log Jr., Polyphase Duplex Decitrig, Modern Polyphase, Polyphase, and Merchants slide rules. The leaflet is small (4 X 3 inches) and was copyrighted in 1944, 1949, 1958, and 1962. Users are to clean the slide rule only with a moistened cloth. Instructions are provided for adjusting and aligning the slide rule.

Date Made: 1964

Maker: Keuffel & Esser Co.

Location: Currently not on view

Place Made: United States: New York, New York City

Subject: MathematicsRule, CalculatingEducation


See more items in: Medicine and Science: Mathematics, Science & Mathematics, Trigonometry, Slide Rules


Exhibition Location:

Credit Line: Gift of Marvin Coolidge

Data Source: National Museum of American History

Id Number: 2007.0181.01.01Accession Number: 2007.0181Catalog Number: 2007.0181.01.01

Object Name: book

Physical Description: paper (overall material)Measurements: overall: 20.5 cm x 13.5 cm x 1 cm; 8 1/16 in x 5 5/16 in x 13/32 in


Record Id: nmah_1418225

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.