Hemmi Simplex Slide Rule Retailed by Post (1447)
date: label: date made
content: 1969-04
name: label: maker
content: SUN HEMMI JAPAN CF
label: retailer
content: Frederick Post Co.
notes: label: Description
content: This ten-inch one-sided bamboo rule is coated with white celluloid only on the front. There is no indicator. The base has A, D, and K scales. The slide has B, CI, and C scales on one side and S, L, and T scales on the other side. The CI scale is numbered in red. The base is held together with a sheet of metal and with clear celluloid that has red hairlines at each end. The back of this metal and celluloid backing contains a chart on white plastic. The chart provides various relationships or conversions between the C and D scales as well as fundamental trigonometric relationships.
label: Description
content: The instrument is marked in red at the top center of the base: FREDERICK POST CO. 1447. It is marked in black at the top right: HEMMI JAPAN. The Post logo (in red) appears at the right side of the slide. The back is stamped with the date code TD, indicating the rule was manufactured in April 1969. The style of the Post logo is consistent with this date.
label: Description
content: The Frederick Post Company of Chicago imported slide rules made by the Japanese firm of Hemmi from about 1932 to the 1970s, with a brief interruption during World War II. Post sold Model 1447 from about 1949 to about 1971.
label: Description
content: Chemist Albert S. Matlack donated this slide rule. He recalled that it was mainly used by his laboratory technician at the Hercules Research Center in Wilmington, Del.
label: Description
content: References: International Slide Rule Museum, "Slide Rule Dates and Time-Lines," http://sliderulemuseum.com/SR_Dates.htm; <i>Drafting Materials for Engineering, Architecture, and Art by Post</i>, 19th ed. (Chicago: The Frederick Post Co., 1949–1950), 68–69; Carmen Drahl, "The Guy With the Questions at NOS: Albert S. Matlack," 7 June 2011, http://cenblog.org/newscripts/2011/06/the-guy-with-the-questions-at-nos-albert-s-matlack/..
label: Location
content: Currently not on view
place: label: place made
content: Japan: Tōkyō, Tokyo
topic: label: Subject
content: Mathematics
label: Subject
content: Engineering
label: Subject
content: Rule, Calculating
label: Subject
content: General Calculation
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 Albert S. Matlack
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 1989.0032.02
label: accession number
content: 1989.0032
label: catalog number
content: 1989.0032.02
objectType: label: Object Name
content: slide rule
physicalDescription: label: Physical Description
content: bamboo (overall material)
label: Physical Description
content: metal (part material)
label: Physical Description
content: celluloid (laminate material)
label: Measurements
content: overall: .8 cm x 28 cm x 2.8 cm; 5/16 in x 11 1/32 in x 1 3/32 in