Ricoh Duplex Slide Rule Sold by Staedtler-Mars (944-24)
date: label: date made
content: 1960-1972
name: label: maker
content: Ricoh Measuring Instruments
notes: label: Description
content: Numerous slide rule manufacturers also sold rules made by other companies. For instance, the German pencil-manufacturer Staedtler, which used the trade name Mars for slide rules, marketed this ten-inch bamboo rule coated with white plastic and held together with metal L-shaped endpieces. Staedtler's own rules had distinctive light blue slides, but this rule is entirely white. It was made as model 151 between about 1960 and 1972 by the Japanese firm known as San-Ai Measuring Instruments and then as Ricoh Measuring Instruments. Several companies besides Staedtler sold these rules, including Lutz.
label: Description
content: On one side, the base has LL/1, LL/2, LL/3, DF, D, LL3, LL2, and LL1 scales, with CF, CIF, CI, and C scales on the slide. The right end of each scale identifies the meaning of the letters, i.e., the C and D scales are marked with an x. The right end of the slide has the company logo of a Greek soldier's head and is marked: STAEDTLER (/) MARS (/) 944 24. On the other side, the base has LL/0, L, K, A, D, DI, P, and LL0 scales, with B, S, ST, T, and C scales on the slide. The indicator is clear plastic with white plastic edges. The bottom edge of the rule is marked: JAPAN.
label: Description
content: The rule fits in a brown leather case with a loop for attaching to a belt. The flap is marked: STAEDTLER (/) MARS. The back bottom of the case is marked: JAPAN. A blue and white cardboard box is marked on the end: STAEDTLER MARS (/) 1 BAMBOO SLIDE RULE 944 24 (/) Duplex Log Log 10". See 2009.0019.02.01 for instructions. Compare to 1986.0790.04.
label: Description
content: The mathematician and theoretical computer scientist Harley Flanders received this instrument as a gift, but he never used it.
label: Description
content: References: "A Modern Brand Rich in Tradition," Staedtler, http://www.staedtler.com/brand_with_tradition_gb.Staedtler?ActiveID=3049; David A. Davis, "Relay/Ricoh Archive," http://www.oocities.org/usra482b/page3.html; Peter M. Hopp, <i>Slide Rules: Their History, Models, and Makers</i> (Mendham, N.J.: Astragal Press, 1999), 213.
label: Location
content: Currently not on view
place: label: place made
content: Japan: Japan
topic: label: Subject
content: Mathematics
label: Subject
content: Rule, Calculating
label: Subject
content: Engineering, General
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 Harley Flanders
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 2009.0019.02
label: accession number
content: 2009.0019
label: catalog number
content: 2009.0019.02
objectType: label: Object Name
content: slide rule
physicalDescription: label: Physical Description
content: bamboo (overall material)
label: Physical Description
content: plastic (laminate material)
label: Physical Description
content: metal (part material)
label: Physical Description
content: leather (case material)
label: Physical Description
content: paper (case material)
label: Measurements
content: overall: 3 cm x 38 cm x 8 cm; 1 3/16 in x 14 31/32 in x 3 5/32 in