beam compass

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.
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Origin:
1775–85
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Beam compass is always a great word to know.
So is doohickey. Does it mean:
a gadget; dingus; thingumbob.
a chattering or flighty, light-headed person.
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Collins
World English Dictionary
beam compass
 
—n
Also called: trammel an instrument for drawing large circles or arcs, consisting of a horizontal beam along which two vertical legs slide

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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