Keuffel & Esser 4092-3 Log Log Duplex Slide Rule
date: label: date made
content: ca 1936
name: label: maker
content: Keuffel & Esser Co.
notes: label: Description
content: This ten-inch mahogany two-sided linear slide rule is coated with white celluloid and held together with L-shaped metal end pieces. On one side, the base has K, DF, D, and L scales, with CF, CIF, CI, and C scales on the slide. The right end of the slide is marked in red: < 4092-3 >. The bottom of the base is marked in red: KEUFFEL & ESSER CO. N.Y.; PAT. JUNE 5. '00 DEC. 22. '08 APRIL 1 '24; MADE IN U.S.A. On the other side, the base has LL0, A, LL3, LL2, and LL1 scales, with B, S, T, and C scales on the slide. The left end of the slide and the front of the base are marked with a serial number: 373480.
label: Description
content: The indicator is frameless glass with plastic edges held together with metal screws. One edge is marked: K&E.CO.N.Y. (/) PAT.8.17.15. The rule fits in a brown leather case, which is marked on the front of the flap: 4092-3S. The top of the flap is marked: K & E (/) LOG LOG DUPLEX (/) SLIDE RULE. The names of several former owners of the rule are written on the case, including: Bill A.'s; Charles Potter; Theta Xi; Wm. Lund (/) 407 Delaware (/) Ave. (/) Bethlehem Penn.
label: Description
content: For information on the patents, see 322761, 318475, and 318479. Keuffel & Esser of New York introduced model 4092-3 in 1922 and in 1925 added a K scale to the rule and an N to the prefix of the model number. The prefix was dropped in 1936, but the indicator was replaced with a new version of K&E's frameless indicator. K&E stopped selling model 4092-3 in 1938, when it was priced with a leather case at $11.75. The serial number on this example is consistent with a manufacture date between 1936 and 1938, but the indicator is of the pre-1936 style. Compare to 1981.0933.01.
label: Description
content: References: <i>K&E Slide Rules and Calculating Instruments</i> (New York, 1922), 10–11; <i>K&E Slide Rules and Calculating Instruments</i> (New York, 1925), 10–11; <i>Catalogue of Keuffel & Esser Co.</i>, 38th ed. (New York, 1936), 318–319; Ed Chamberlain, "Estimating K&E Slide Rule Dates," 27 December 2000, http://www.sphere.bc.ca/test/ke/320-k+e_date2.jpg.
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
label: See more items in
content: Science & Mathematics
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content: Slide Rules
creditLine: label: Credit Line
content: Gift of Edward L. Heller
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 1984.1068.02
label: catalog number
content: 1984.1068.02
label: accession number
content: 1984.1068
objectType: label: Object Name
content: calculating rule
label: Object Name
content: slide rule
physicalDescription: label: Physical Description
content: plastic (laminate material)
label: Physical Description
content: mahogany (overall material)
label: Physical Description
content: metal (part material)
label: Physical Description
content: glass (cursor material)
label: Physical Description
content: leather (case material)
label: Measurements
content: overall: 2.8 cm x 33.2 cm x 6.3 cm; 1 3/32 in x 13 1/16 in x 2 15/32 in