Protractor and Ruler Scale

Description
According to the accession record, this "special protractor and scale" is attributed to the factory operated by William and Lewis Ephraim Gurley in Troy, N.Y. No examples of this protractor could be identified in Gurley catalogs, although the "special" may refer to a special order placed by the U.S. Geological Survey, which in 1907 declared this instrument "obsolete" and transferred it to the Smithsonian.
This semicircular steel protractor within a rectangular frame is exactly like ID number MA*247967, except that there is no second scale to replace the sliding scale screwed to the top of the protractor. The number 1 is marked on the bottom of each of these two screws. This instrument also retains the bottom half of its original mahogany case, which is lined with blue velvet and bears two brass hooks for latching the case. The protractor is disassembled from the straight edge on which it slides so that both pieces fit in the case.
Reference: Deborah J. Warner, "Browse by Maker: Gurley," National Museum of American History Physical Sciences Collection: Surveying and Geodesy, http://americanhistory.si.edu/collections/surveying/maker.cfm?makerid=14.
Location
Currently not on view
Object Name
protractor
date made
1879-1907
maker
W. & L. E. Gurley
Gurley, Lewis E.
Gurley, William
Physical Description
mahagony (overall material)
steel plate (overall material)
copper (overall material)
Measurements
overall: 2 cm x 23 cm x 30.5 cm; 25/32 in x 9 1/16 in x 12 in
place made
United States: New York, Troy
ID Number
MA*247968
accession number
47736
catalog number
247968
subject
Protractors
Science & Mathematics
Mathematics
Protractor
Surveying
See more items in
Medicine and Science: Mathematics
Protractors
Data Source
National Museum of American History, Kenneth E. Behring Center
Credit Line
Transfer from U.S. Geological Survey
Additional Media

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