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beam compass

noun

, Drafting.
  1. 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.


beam compass

noun

  1. an instrument for drawing large circles or arcs, consisting of a horizontal beam along which two vertical legs slide Also calledtrammel


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Word History and Origins

Origin of beam compass1

First recorded in 1775–85

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Example Sentences

The beam-compass, Fig. 208, consists of two trammel-points running on a beam which may be made of any convenient length.

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tortuous

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