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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
1775-85 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for beam-compass
Historical Examples
  • 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 slide Also 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
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