Keuffel & Esser 68-1555 Doric Duplex Slide Rule
date: label: date made
content: 1962-1971
name: label: maker
content: Keuffel & Esser Co.
notes: label: Description
content: This turquoise plastic 5-inch duplex slide rule has DF, D, and L scales on the front of the base and CF, CI, and C scales on the slide. The top of the base is marked: PAT. PEND.; CELANESE CELCON; MADE IN U.S.A. The right end of the slide is marked: DORIC (/) K & E CO. On the back, the base has K, A, D, and T scales, and the slide has B, ST, and S scales. The indicator is plastic, and the endpieces are metal.
label: Description
content: The rule fits in a black leather sheath, embossed with the K+E logo and imprinted in gold: CELANESE CELCON (/) DESIGNED FOR THE ENGINEER ∙ ENGINEERED FOR THE DESIGNER. The sheath and a leaflet, "How to Take Care of Your Slide Rule," fit in a cardboard box covered with green vinyl. The end of the box bears a label marked: K+E (/) 68 1555 (/) POCKET SLIDE RULE (/) LEATHER SHEATH (/) MADE IN U.S.A.; TRADE MARKS ®. It is also marked there: OLD (/) 4168.
label: Description
content: According to the donor, “The Celcon rule is significant because this is the first use of this very durable engineering plastic or resin in a slide rule. This durable material, trademarked Celcon, was an American invention made in the laboratories of the Celanese Corporation.” The donor was corporate research director at Celanese Corporation before he retired in December 1981. The 1962 Keuffel & Esser Catalog lists a 5" slide rule with model number 68 1555 made of “Ivorite.” The instrument is shown in the 1964 and 1967 catalogs (still as made of “Ivorite”) and called the “Doric.” It is not shown in the 1972 catalog. Celanese Corporation first used the term “Celcon” to refer to a thermoplastic in 1945, and trademarked the term in 1960. It seems likely that this rule was produced especially for Celanese Corporation in the period 1962–1971. This was the only time K&E manufactured a slide rule that was not white.
label: Description
content: References: Joseph L. Soper, "The Celanese Celcon Promotional Slide Rule," in <i>K&E Salisbury Products Division Slide Rules</i> (Pleasanton, Calif.: The Oughtred Society, 2007), 115; 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: Rule, Calculating
label: Subject
content: Plastics
label: Subject
content: Mathematics
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 Alfred E. Brown
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 1993.0357.01
label: accession number
content: 1993.0357
label: catalog number
content: 1993.0357.01
objectType: label: Object Name
content: slide rule
physicalDescription: label: Physical Description
content: plastic (overall material)
label: Physical Description
content: leather (case material)
label: Physical Description
content: paper (case material)
label: Measurements
content: overall: 3.7 cm x 21.4 cm x 7.8 cm; 1 15/32 in x 8 7/16 in x 3 1/16 in