Drop Pen
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Drop pen, or rivet pen, can make small circles faster than the bow pen. The pen is useful in bridge work, constructional work, and topographical drawing.
Galleries
Mechanical Drawing ToolsSource
French, Thomas E A Manual of Engineering Drawing for Students and Draftsmen (New York, NY: McGraw-Hill, 1911)
Downloads
2400×2016, 403.2 KiB
1024×860, 79.6 KiB
640×537, 44.2 KiB
320×268, 17.2 KiB