bow-compass

bow compass

[boh]
noun
any of several types of compasses having the legs joined by a bow-shaped piece.

Origin:
1790–1800

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Collins
World English Dictionary
bow compass (bəʊ)
 
n
Also called: bow-spring compass a compass for drawing, in which the legs are joined by a flexible metal bow-shaped spring rather than a hinge, the angle being adjusted by a screw

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