beam compass

noun Drafting.

a compass having adjustable legs, set perpendicular to the paper and sliding along a horizontal bar so as to permit the drawing of large circles.

Origin of beam compass

First recorded in 1775–85 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for beam compass

  • The beam-compass, Fig. 208, consists of two trammel-points running on a beam which may be made of any convenient length.

    Handwork in Wood|William Noyes

British Dictionary definitions for beam compass

beam compass


an instrument for drawing large circles or arcs, consisting of a horizontal beam along which two vertical legs slideAlso called: trammel
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012