Relay/Ricoh Duplex Slide Rule for Lutz (151P)
date: label: date made
content: 1968
name: label: maker
content: Ricoh Measuring Instruments
notes: label: Description
content: This ten-inch, two-sided bamboo rule is coated on all sides with white plastic and has a plastic indicator with white plastic edges. Metal L-shaped endpieces hold the rule together. On one 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 top left edge of the base has a date stamp: Q.S–3. The right end of the slide is marked: LUTZ (/) NO.151P. It is also marked U.S. The bottom right corner of the base is marked: MADE IN JAPAN.
label: Description
content: On the other 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 rule fits in an orange leather case marked on the flap: LUTZ (/) SLIDE RULE. Inside the flap is written in pen: PHIL (/) KRUPEN (/) 9518 SEMINOLE ST (/) SILVER SPRING, MD. The back of the case is marked: MADE IN JAPAN.
label: Description
content: The Lutz Company began to manufacture drawing instruments and artists' materials in Guttenberg, N.J., around 1892. After World War II, the firm imported slide rules made in Japan by Ricoh Measuring Instruments (known from 1948 to 1950 as the Nippon Slide Rule Company, from 1950 to 1958 as Relay Industries, and from 1958 to 1963 as San-Ai Measuring Instruments). The letter Q in the date stamp suggests that the slide rule was made in 1968. Compare to 2009.0019.02; unlike this rule, that rule defines the mathematical meaning of each scale.
label: Description
content: The physicist Philip Krupen (1915–2001) donated this slide rule to the Smithsonian in 1986. Krupen received his B.S. degree from Brooklyn College in 1935, worked on the development of the proximity fuze during and after World War II, earned a master's degree in physics from George Washington University, and spent a total of 38 years working for the U.S. government before his retirement in 1973.
label: Description
content: References: State of New Jersey, <i>Manual of the Legislature of New Jersey</i> (Trenton: T. F. Fitzgerald, 1902), 296–297; Paul Ross, "Relay/Ricoh Slide Rules," <i>Journal of the Oughtred Society</i> 9, no. 2 (2000): 64; "Philip Krupen," <i>Washington Post</i>, February 23, 2001, B07.
label: Location
content: Currently not on view
place: label: place made
content: Japan: Japan
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 Philip Krupen
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 1986.0790.04
label: accession number
content: 1986.0790
label: catalog number
content: 1986.0790.04
objectType: label: Object Name
content: slide rule
physicalDescription: label: Physical Description
content: plastic (laminate material)
label: Physical Description
content: bamboo (overall material)
label: Physical Description
content: leather (case material)
label: Physical Description
content: plastic (cursor material)
label: Measurements
content: overall: 2.5 cm x 36.7 cm x 7.5 cm; 31/32 in x 14 7/16 in x 2 15/16 in