Beam Compass

Description
This instrument consists of a wooden beam and a single German silver trammel with a micrometer and needle point. A large round hole in one end of the beam allows the instrument to be hung. The other end of the beam is marked in pencil at each of the first six inch points. The trammel is similar but not fully identical to Dietzgen's model number 646, which sold with a pair of trammels, two needle/pencil points, and a pen point for $9.20 in 1904–1905. This instrument was owned by the renowned American designer of steam engines, Erasmus Darwin Leavitt Jr. (1836–1916), and donated by his granddaughter, Margaret van D. Rice.
Reference: Catalogue & Price List of Eugene Dietzgen Co., 7th ed. (Chicago, 1904), 71.
Location
Currently not on view
date made
ca 1900
Physical Description
metal (overall material)
wood (overall material)
Measurements
overall: 34.5 cm x 6.4 cm x 1.4 cm; 13 19/32 in x 2 17/32 in x 9/16 in
ID Number
1977.0460.04
accession number
1977.0460
catalog number
336075
Credit Line
Gift of Margaret van D. Rice
subject
Mathematics
Drawing Instruments
Engineering
See more items in
Medicine and Science: Mathematics
Science & Mathematics
Dividers and Compasses
Data Source
National Museum of American History, Kenneth E. Behring Center

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