Drafting Triangle

This 7-1/2" 30°-60°-90° triangle has a beveled hypotenuse and a 9/16" round hole at the center for positioning and holding the instrument. Compare to MA*304826.137 and MA*335331. See also 1983.0238.01 and 1979.0876.01. The triangle was found in the Physical Sciences collections in 1979 with objects that suggest an association with Cleveland Abbe (1838–1916), an American engineer, astronomer, and meteorologist who worked for the U.S. Weather Service from 1871 until shortly before his death.
Reference: accession file.
Currently not on view
Object Name
date made
late 19th century
Physical Description
wood (overall material)
overall: 11 cm x 19 cm x .2 cm; 4 11/32 in x 7 15/32 in x 3/32 in
ID Number
catalog number
accession number
Squares and Triangles
Science & Mathematics
Drawing Instruments
See more items in
Medicine and Science: Mathematics
Squares and Triangles
Data Source
National Museum of American History, Kenneth E. Behring Center
Additional Media

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