- 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
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
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
- an instrument for drawing large circles or arcs, consisting of a horizontal beam along which two vertical legs slideAlso called: trammel
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