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Definition of Circumferentor
1. n. A surveying instrument, for taking horizontal angles and bearings; a surveyor's compass. It consists of a compass whose needle plays over a circle graduated to 360°, and of a horizontal brass bar at the ends of which are standards with narrow slits for sighting, supported on a tripod by a ball and socket joint.
Definition of Circumferentor
1. Noun. (surveying) An instrument used to measure horizontal angles, consisting of a brass circle and an index, all of one piece. ¹
¹ Source: wiktionary.com