What is a Graphometer?

What is Graphometer?

What is a Graphometer?

The graphometer, semicircle or semicircumferentor is a surveying instrument used for angle measurements. It consists of a semicircular limb divided into 180 degrees and sometimes subdivided into minutes. The limb is subtended by the diameter with two sights at its ends. In the middle of the diameter, a "box and needle" (compass) is fixed. In the same middle, the alidade with two other sights is fitted. The device is mounted on staff via a ball and socket joint. In effect, the device is a half-circumferentor. For convenience, sometimes another half-circle from 180 to 360 degrees may be graduated in another line on the limb.
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