Beam Compasses
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For larger circles beam compasses are used. The two parts called channels which carry the pen and the needle point are clamped to a wooden beam at a distance equal to the radius of the circle. The thumb nut underneath one of the channel pieces makes accurate adjustment possible.
Galleries
Mechanical Drawing ToolsSource
Kenison, Ervin Mechanical Drawing (Chicago, IL: American School of Correspondence, 1916)
Downloads
2400×1055, 222.1 KiB
1024×450, 24.9 KiB
640×281, 13.9 KiB
320×140, 6.0 KiB