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bow compass[′bau̇ ‚käm·pəs]
A small compass whose legs are connected by a spring shaped like a bow, rather than by a joint.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
A compass, one leg of which carries a pencil or pen; the legs are connected by a bow-shaped spring instead of a joint; used to draw arcs or circles.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.