Semicircular Protractor
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A 6 inches diameter protractor to measure angles to half degrees, made of brass or German silver. They are useful in map and topographical work.
Keywords
angle, angles, protractor, semicircular protractor, semicircle protractor, angle measurer, angle measuringGalleries
Mechanical Drawing ToolsSource
French, Thomas E A Manual of Engineering Drawing for Students and Draftsmen (New York, NY: McGraw-Hill, 1911)
Downloads
2400×1464, 240.8 KiB
1024×624, 40.2 KiB
640×390, 22.7 KiB
320×195, 9.4 KiB