Hemmi-Sun Mannheim Slide Rule

Description
This small (4-inch) one-sided rule is bamboo with a metal backing, entirely covered with white celluloid. A magnifying glass indicator has a metal frame. There are A and D scales on the base. The slide has B and C scales on one side and S, L, and T scales on the other side. The lower edge of the base has a scale of centimeters divided to millimeters. The upper edge of the base has a scale of inches divided to thirty-seconds of an inch.
The D scale is marked at each end: Quot (/) +1; Prod (/) -1. The back of the slide rule is marked: "SUN" (between two drawings of the sun); HEMMI; MADE IN JAPAN. A brown leather case is stamped in gold on the flap: BAMBOO (/) SLIDE RULE (/) "SUN" (between two drawings of the sun) (/) HEMMI. Written in pen inside the flap is: BOB YINGLING.
According to the donor, a colleague used this slide rule in a training program at the American Brass Company Division of Anaconda Mining Company in Waterbury, Conn., in the 1940s. He used it for such problems as calculating the weight of samples from their volume and density.
Location
Currently not on view
date made
ca 1940
maker
SUN HEMMI JAPAN CF
place made
Nihon: Japan
Physical Description
celluloid (laminate material)
bamboo (overall material)
leather (case material)
Measurements
overall: 1.6 cm x 13.1 cm x 3.4 cm; 5/8 in x 5 3/16 in x 1 5/16 in
ID Number
1995.0087.01
accession number
1995.0087
catalog number
1995.0087.01
Credit Line
Gift of William E. Gilbert
subject
Mathematics
Rule, Calculating
General Calculation
See more items in
Medicine and Science: Mathematics
Science & Mathematics
Slide Rules
Data Source
National Museum of American History, Kenneth E. Behring Center

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