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Imagine: Grafometro Graphometer
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Surveying instrument for measuring angles from 0° to 180° and calculating distances by means of triangulation. Used to determine positions of points or objects on land or at sea. Mounted on a tripod, it comprised a graduated semicircle carrying two alidades with sights, one attached to the semicircle, the other rotating on the graduation. Typically fitted with a compass as well.

 
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