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.
The Origin Of Dog DaysThe exact dates of the dog days depend on your latitude, but by today’s estimation they begin on July 3 and come to a close on August 11.
Origin of beam compass
First recorded in 1775–85
Dictionary.com 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
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