Keuffel & Esser 4088-3 Polyphase Duplex Slide Rule
date: label: date made
content: 1920s-1930s
name: label: maker
content: Keuffel & Esser Co.
notes: label: Description
content: This ten-inch mahogany duplex linear slide rule is coated with white celluloid and held together with L-shaped metal end pieces. The front of the base has DF and D scales, with CF, CIF, and C scales on the slide. The right end of the slide is marked in red: < 4088-3 >. The bottom of the base is marked in red: PAT. JUNE 5. '00 DEC.22.'08 KEUFFEL & ESSER CO. N.Y. MADE IN U.S.A. The back of the base has K, A, D, and L scales, with B, S, T, and CI scales on the slide. A serial number is at the left end of the slide: 207989. A different serial number is on the front edge: 206079. The indicator is the second generation of Keuffel & Esser's "frameless" glass style, with white plastic edges and metal screws. One edge is marked: KEUFFEL & ESSER CO. The other edge is marked: PATENT 2,086,502.
label: Description
content: K&E sold model 4088-3 from 1913 to 1939. From 1913 to 1936, the patent dates were indicated as they are on this instrument. Beginning in 1936, the number of a 1933 patent is shown on drawings of the instrument in K&E catalogs. The B scale was added to the slide in 1922. Both serial numbers are consistent with manufacturing dates in the late 1920s. This style of indicator was introduced in 1936 and patented in 1937. The different serial numbers and the discrepancy in dating between the rule and the indicator suggest that this example consists of components mixed from three slide rules. Compare to MA.318476, MA.321778, and 1981.0933.03. For instructions, see 1981.0933.04 and 1981.0933.06.
label: Description
content: References: Adolf W. Keuffel, "Runner for Slide Rules" (U.S. Patent 2,086,502 issued July 6, 1937); Keuffel & Esser Co., <i>Slide Rules and Calculating Instruments</i> (New York, 1922), 8–9; <i>Catalogue of Keuffel & Esser Co.</i>, 38th ed. (New York, 1936), 314–315; Ed Chamberlain, "Estimating K&E Slide Rule Dates," 27 December 2000, http://www.sphere.bc.ca/test/ke/320-k+e_date2.jpg; Clark McCoy, ed., "Collection of Pages from K&E Catalogs for the 4088 Family of Slide Rules," http://www.mccoys-kecatalogs.com/KEModels/ke4088-3family.htm.
label: Location
content: Currently not on view
place: label: place made
content: United States: New York, New York City
topic: label: Subject
content: Mathematics
label: Subject
content: Rule, Calculating
setName: label: See more items in
content: Medicine and Science: Mathematics
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content: Science & Mathematics
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content: Slide Rules
creditLine: label: Credit Line
content: Gift of Keuffel & Esser Company
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: MA.318480
label: accession number
content: 235479
label: catalog number
content: 318480
objectType: label: Object Name
content: slide rule
physicalDescription: label: Physical Description
content: mahogany (overall material)
label: Physical Description
content: celluloid (laminate material)
label: Physical Description
content: glass (cursor material)
label: Physical Description
content: metal (part material)
label: Measurements
content: overall: 1 cm x 31 cm x 4.1 cm; 13/32 in x 12 7/32 in x 1 5/8 in