Hemmi-Sun 255 Duplex Slide Rule
date: label: date made
content: 1952
name: label: maker
content: SUN HEMMI JAPAN CF
notes: label: Description
content: This ten-inch bamboo rule is coated on both sides and its long outer edges with white celluloid. The rule is held together with metal posts. The glass indicator has a metal frame with bamboo and celluloid sides. The rule is marked on the base's upper right front corner: SUN (between two drawings of the sun) HEMMI JAPAN CL NO. 255.
label: Description
content: Hemmi designed this model for electrical engineers. The front of the base has L, K, DF, D, χ, and θ scales. The front of the slide has CF, CIF, CI, and C scales. The back of the base has Sh1, Sh2, Th, A, D, LL3, LL2, and LL1 scales, with B, TI2, TI1, SI, and C scales on the back of the slide.
label: Description
content: The rule is stored in a green rectangular fabricoid and cardboard box which is opened by removing the right end. This end is marked: SUN (between two drawings of the sun) (/) HEMMI BAMBOO (/) SLIDE RULE. There are two stars where the box joins together. Both ends of the box are heavily taped.
label: Description
content: After 1950, Hemmi rules were stamped with codes indicating the year and month of manufacture. According to the code on this instrument (CL), it was made in December 1952. The donor reported that he purchased it in Japan in 1955.
label: Description
content: Reference: International Slide Rule Museum, "Slide Rule Dates and Time-Lines," http://sliderulemuseum.com/SR_Dates.htm.
label: Location
content: Currently not on view
topic: label: Subject
content: Mathematics
label: Subject
content: Engineering, Electrical
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 Clyde S. Freint
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 1992.0574.01
label: accession number
content: 1992.0574
label: catalog number
content: 1992.0574.01
objectType: label: Object Name
content: slide rule
physicalDescription: label: Physical Description
content: paper (case material)
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: glass (cursor material)
label: Measurements
content: overall: 2 cm x 33.1 cm x 6.5 cm; 25/32 in x 13 1/32 in x 2 9/16 in