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Webster 1913 Edition

Circumferentor

Cir-cumˊfer-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 slits for sighting, supported on a tripod by a ball and socket joint.
2.
A graduated wheel for measuring tires; a tire circle.

Webster 1828 Edition

Circumferentor

CIRCUMFERENTOR

,
Noun.
An instrument used by surveyors for taking angles. It consists of a brass index, and circle, all of a piece; on the circle is a chart, divided into 360 degrees. There are also two sights to screw on and slide up and down the index; also a spangle and socket screwed on the back side of the circle to put the head of the staff in.

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