A Graphometer is a surveying instrument which is used to measure angles. It consist of semicircle limb which is divided into 180 degree and sometime sub-divided into minutes.
- The term graphometer was introduced by Phillipe Danfrie in 1597.
- 19th century graphometer had telescope rather than open sight.
Components
- It consist of a limb which is subtended by the diameter with two sights at its ends.
- The device is mounted in a staff via a ball and socket joint.
- The whole device is circumfentor.
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