Wiktionary
bow compass
n. 1 An arcograph. 2 A small pair of compasses, one leg of which carries a pencil or pen for drawing circles. Its legs are often connected by a bow-shaped spring rather than a joint. 3 A pair of compasses with a bow or arched plate riveted to one of the legs and passing through the other.
Usage examples of "bow compass".
Fountain pens, ballpoints, knives, sable brushes, a wide variety of pencils and erasers, bow compass, T square.