bow-compass

bow-compass is a   Noun

Definition:

[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.

Synonyms: