Object Details
maker
Felsenthal
Description
This clear plastic semicircular protractor is divided by twenties and marked by two hundreds from 0 to 3,200 and from 3,200 to 6,400. A pinhole is at the origin point. The interior is labeled: ANGULAR MILS; 8016738. This protractor was item no. FAO-44. Felsenthal Instruments Company manufactured it for the U.S. Army about 1958.
The Felsenthal Instruments Company was the leading supplier of mathematical instruments to the U.S. Army Air Force and the U.S. Navy Bureau of Aeronautics, particularly during World War II (when the firm was known as G. Felsenthal & Sons). After the company ceased operations in approximately 1976, it provided a large sample of its products to the Smithsonian.
See also 1977.1141.01, 1977.1141.02, 1977.1141.03, 1977.1141.05, 1977.1141.08, 1977.1141.09, 1977.1141.11, 1977.1141.12, 1977.1141.18, 1977.1141.19, 1977.1141.20, 1977.1141.21, 1977.1141.22, 1977.1141.23, 1977.1141.24, 1977.1141.30, and 1977.1141.39.
Location
Currently not on view
Credit Line
Gift of Ben Wharton Rau and Margery Felsenthal Rau
date made
ca 1958
ID Number
1977.1141.10
accession number
1977.1141
catalog number
336394
Object Name
protractor
Physical Description
plastic (overall material)
Measurements
overall: .2 cm x 15.2 cm x 8.3 cm; 3/32 in x 5 31/32 in x 3 9/32 in
place made
United States: Illinois, Chicago
See more items in
Medicine and Science: Mathematics
Science & Mathematics
Protractors
Data Source
National Museum of American History
Subject
Mathematics
Protractor
Link to Original Record
Record ID
nmah_904367