Keuffel & Esser 4088-3 Polyphase Duplex Slide Rule

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This ten-inch duplex linear slide rule is made from boxwood faced with white celluloid and held together with L-shaped metal end pieces. On one side, the base has DF and D scales, with CF, CIF, and C scales on the slide. The bottom of the base is marked: KEUFFEL & ESSER CO. N. Y.; PAT. JUNE 5, '00 DEC. 22, '08. On the other side, there are K, A, D, and L scales on the base and S, T, and CI scales on the slide. Both pieces of the base and the slide are stamped on one end: 13. The indicator is glass in a metal frame with vertical bars on the sides.
Keuffel & Esser introduced this form of slide rule in 1913 as model 4088-3 and sold it with a leather case for $7.00. This style of indicator was used only from 1913 to 1915, when K&E switched to its "frameless" glass cursor. This example thus dates to 1913–1915. Compare to MA.321778, 1981.0933.03, and MA.318480.
References: Willie L. E. Keuffel, "Slide-Rule" (U.S. Patent 651,142 issued June 5, 1900) and "Slide-Rule" (U.S. Patent 907,373 issued December 22, 1908); Catalogue of Keuffel & Esser Co., 34th ed. (New York, 1913), 304a; Catalogue of Keuffel & Esser Co., 35th ed. (New York, 1915), 307b.
Currently not on view
date made
Keuffel & Esser Co.
place made
United States: New York, New York
Physical Description
boxwood (overall material)
metal (part material)
celluloid (laminate material)
glass (cursor material)
overall: 1 cm x 4 cm x 31 cm; 13/32 in x 1 9/16 in x 12 7/32 in
ID Number
catalog number
accession number
Credit Line
Gift of Keuffel & Esser Company
Rule, Calculating
See more items in
Medicine and Science: Mathematics
Science & Mathematics
Slide Rules
Data Source
National Museum of American History


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