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.


French, Thomas E A Manual of Engineering Drawing for Students and Draftsmen (New York, NY: McGraw-Hill, 1911)


TIFF (full resolution)

2400×1464, 240.8 KiB

Large GIF

1024×624, 40.2 KiB

Medium GIF

640×390, 22.7 KiB

Small GIF

320×195, 9.4 KiB