- 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
- Data Source
- National Museum of American History
- Keuffel & Esser Co.
- date made
- Credit Line
- Gift of Alfred E. Brown
- Physical Description
- paper (overall material)
- overall: 19.8 cm x 13.4 cm; 7 25/32 in x 5 9/32 in
- Object Name
International media Interoperability Framework
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