Semicircular Military Protractor
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The semicircular protractor used to measure angles by the military.
Galleries
ProtractorsSource
Chief of Engineers Advance Map and Aerial Photograph Reading (Washington, DC: United States Government Printing Office, 1941)
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2400×1228, 252.9 KiB
1024×523, 44.0 KiB
640×327, 24.4 KiB
320×163, 9.8 KiB