bow-compass

Bow"-com`pass, n.; pl. Bow-compasses (. 1. An arcograph. 2. A small pair of compasses, one leg of which carries a pencil, or a pen, for drawing circles. Its legs are often connected by a bow- shaped spring, instead of by a joint. 3. A pair of compasses, with a bow or arched plate riveted to one of the legs, and passing through the other.

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