Drawing Instrument, Triangulator

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Description
This instrument supplies a grid of lines for measuring photographs. The fitted compartments of the wooden case hold a socket wrench, an open end wrench, brass pin guides in two sizes, brass nuts, brass bolts, pins, and arms with slots down the middle and a hole at each end that may be joined together by nuts and bolts. These arms are made in three different lengths.
A paper tag reads in part: Serial No. 227. It also reads in part: Date SEP 28 1943. It also reads: ABRAMS INSTRUMENT CO. (/) LANSING, MICHIGAN, U.S.A.
For a related object, see MA*336631.
Reference:
Talbert Abrams, Essentials of Aerial Surveying and Photo Interpretation, New York: McGraw-Hill, 1944, pp. 218-244.
Location
Currently not on view
date made
ca 1943
1943
maker
Abrams Instrument Corporation
place made
United States: Michigan, Lansing
Physical Description
metal (parts material)
wood (case material)
paper (tag material)
Measurements
overall: 8.7 cm x 44 cm x 19.4 cm; 3 7/16 in x 17 5/16 in x 7 5/8 in
ID Number
MA.333632
catalog number
333632
accession number
300659
Credit Line
Gift of the University of Missouri - Columbia
subject
Mathematics
Drafting, Engineering
See more items in
Medicine and Science: Mathematics
Science & Mathematics
Single Drawing Instruments
Data Source
National Museum of American History, Kenneth E. Behring Center

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