A circumferentor, or surveyor`s compass, is an instrument used in surveying to measure horizontal angles. It was superseded by the theodolite in the early 19th century. A circumferentor consists of a circular brass box containing a magnetic needle, which moves freely over a brass circle, or compass divided into 360 degrees. The needle is protecte....
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• (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
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An early 17thC surveying instrument with a central compass surrounded by a brass circle marked with degrees, over which arch several sights to guide the eye. From 1758, English surveyors used it with a theodolite allowing them to measure both horizontal bearings and elevation at one time.
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An early 17thC surveying instrument with a central compass surrounded by a brass circle marked with degrees, over which arch several sights to guide the eye. From 1758, English surveyors used it with a theodolite allowing them to measure both horizontal bearings and elevation at one time.
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Cir·cum`fer·en'tor noun [ See
Circumfer .]
1. 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...
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A circumferentor is a surveyor's instrument consisting of a flat bar with vertical sights at each end and a compass in the middle used for taking horizontal bearings and measuring horizontal angles.
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circumferentor A surveyor's compass with diametral projecting arms, each carrying a vertical slit sight.
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an alidade equipped with a compass and two diametrically opposed vertical arms with slits for sighting through.
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