bowcompass

listen to the pronunciation of bowcompass
Английский Язык - Английский Язык
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
An arcograph
A pair of compasses, with a bow or arched plate riveted to one of the legs, and passing through the other