The Compass (drafting) reference article from the English Wikipedia on 24-Jul-2004
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Compass (drafting)

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a compass

In mathematics and drafting, a device known as a compass (or pair of compasses) is used by mathematicians and craftsmen in geometry to draw or inscribe a circle or arc. Simply, this type of compass is used as a drafting instrument used for drawing circles and in ruler-and-compass constructions.