beam compass
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beam compass
[′bēm ‚käm·pəs] (graphic arts)
A compass for drawing large circles, consisting of a beam with sliding sockets carrying steel or pencil points.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
beam compass

beam compass
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.