| 释义 |
beam compass
beam compass n (Tools) an instrument for drawing large circles or arcs, consisting of a horizontal beam along which two vertical legs slide. Also called: trammel beam compass
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.ThesaurusSeetrammel |