alidade protractor

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Demicircle — Dem i*cir cle, n. [Cf. F. demi cercle.] An instrument for measuring angles, in surveying, etc. It resembles a protractor, but has an alidade, sights, and a compass. [1913 Webster] … The Collaborative International Dictionary of English
Dividing engine — at the Michigan Museum of Surveying A dividing engine is a device specifically employed to mark graduations on measuring instruments. History There has always been a need for accurate measuring instruments. Whether it is a linear device such as a … Wikipedia

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