beam compass

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beam compass

[′bēm ‚käm·pəs]
(graphic arts)
A compass for drawing large circles, consisting of a beam with sliding sockets carrying steel or pencil points.

beam compass

beam compass
An instrument used to draw large circles or arcs of circles for full-sized working drawings; has a long horizontal bar on which two movable heads slide to and fro, one of which carries a pencil, and the other a sharp-pointed pin or tracer, the distance between them determining the radius of the circle.