Bow-Compass
From BiblePortal Wikipedia
Bow-Compass [1]
(1): (n.) A pair of compasses, with a bow or arched plate riveted to one of the legs, and passing through the other.
(2): (n.) An arcograph.
(3): (n.) 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.
