beam compass

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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
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014