Hemmi-Sun Mannheim Slide Rule

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.
Currently not on view
Object Name
calculating rule
slide rule
date made
ca 1940
Physical Description
celluloid (laminate material)
bamboo (overall material)
leather (case material)
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
place made
Nihon: Japan
ID Number
accession number
catalog number
Slide Rules
Science & Mathematics
Rule, Calculating
General Calculation
See more items in
Medicine and Science: Mathematics
Slide Rules
Data Source
National Museum of American History, Kenneth E. Behring Center
Credit Line
Gift of William E. Gilbert
Additional Media

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