Protractor and Ruler Scale
date: label: date made
content: 1879-1907
name: label: maker
content: W. & L. E. Gurley
label: maker
content: Gurley, Lewis E.
label: maker
content: Gurley, William
notes: label: Description
content: 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.
label: Description
content: 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.
label: Description
content: Reference: Deborah J. Warner, "Browse by Maker: Gurley," <I>National Museum of American History Physical Sciences Collection: Surveying and Geodesy</I>, http://americanhistory.si.edu/collections/surveying/maker.cfm?makerid=14.
label: Location
content: Currently not on view
place: label: place made
content: United States: New York, Troy
topic: label: Subject
content: Mathematics
label: Subject
content: Protractor
label: Subject
content: Surveying
setName: label: See more items in
content: Medicine and Science: Mathematics
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content: Science & Mathematics
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content: Protractors
creditLine: label: Credit Line
content: Transfer from U.S. Geological Survey
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: MA.247968
label: accession number
content: 47736
label: catalog number
content: 247968
objectType: label: Object Name
content: protractor
physicalDescription: label: Physical Description
content: mahagony (overall material)
label: Physical Description
content: steel plate (overall material)
label: Physical Description
content: copper (overall material)
label: Measurements
content: overall: 2 cm x 23 cm x 30.5 cm; 25/32 in x 9 1/16 in x 12 in