Protractor
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The protractor, an instrument for laying off and measuring angles, is made of steel, brass, horn or paper.
Galleries
Mechanical Drawing ToolsSource
Kenison, Ervin Mechanical Drawing (Chicago, IL: American School of Correspondence, 1916)
Downloads
2400×1479, 414.6 KiB
1024×631, 50.3 KiB
640×394, 26.6 KiB
320×197, 10.3 KiB