Keuffel & Esser 4070-3 Polyphase Duplex Trig Slide Rule
date: label: date made
content: 1954-1962
name: label: maker
content: Keuffel & Esser Co.
notes: label: Description
content: This ten-inch mahogany duplex slide rule is coated with white celluloid and held together with metal endpieces that are significantly corroded. On one side, the base has DF, D, and L scales, with CF, CIF, CI, and C scales on the slide. The top of the base is marked in faded red: KEUFFEL & ESSER CO.; PATS. 2,500,460 2,168,056 2,170,144 PAT. PEND.; MADE IN U.S.A. The right end of the slide is marked in red: © (/) K + E; < 4070-3 >. On the other side, the base has K, A, D, and DI scales, with B, T, ST, and S scales on the slide. The left end of the slide has a serial number: 952594. The top and bottom of the base are both marked at the left end: 594. The indicator is glass with plastic edges; it is so corroded that it has fallen apart and is no longer on the rule.
label: Description
content: There is a green leather case with white inlays on the holder for the flap. The flap is marked: K + E. Inside the flap is written in ink: Jeffery (/) Smith (/) P 68. An orange chamois case holds a magnifier with two lenses and a metal frame. On one side, the frame is marked: K + E. On the other side, the frame is marked: PAT. NO. 2556806. A green cardboard box, missing one end, holds the rule, its case, the magnifier, and its case.
label: Description
content: For information on the patents on the rule, see 1993.0482.01 and 2007.0181.01. Paul E. Gaire of Manasquan, N.J., received a patent for the magnifier in 1951, replacing his earlier attempt at a magnifier, which could only be used on one side of a slide rule at a time. This double magnifier was first advertised in Keuffel & Esser's 1954 catalog and first pictured in the 1962 catalog; it sold for $5.50. K&E sold this version of the model 4070-3 slide rule from 1952 to 1962, at a price of $20.50.
label: Description
content: References: Paul E. Gaire, "Magnifying Runner for Slide Rules" (U.S. Patent 2,556,806 issued June 12, 1951); <i>K + E Catalog</i>, 42nd ed. (New York: Keuffel & Esser Co., 1954), 276–277; Keuffel & Esser Co., <i>Slide Rules</i>, Catalog 8 (Hoboken, N.J., 1962), 29–30; Clark McCoy, ed., "K&E Catalogs and Price Lists for Slide Rules," http://www.mccoys-kecatalogs.com/KEmain.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 Alice W. Smith
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 1990.0317.03
label: catalog number
content: 1990.0317.03
label: accession number
content: 1990.0317
objectType: label: Object Name
content: calculating rule in case
label: Object Name
content: slide rule in case
physicalDescription: label: Physical Description
content: mahogany (overall material)
label: Physical Description
content: celluloid (laminate material)
label: Physical Description
content: metal (part material)
label: Physical Description
content: glass (cursor material)
label: Physical Description
content: leather (case material)
label: Physical Description
content: cardboard (part material)
label: Measurements
content: overall: 3.8 cm x 7 cm x 33 cm; 1 1/2 in x 2 3/4 in x 13 in