Telescopic Alidade

telescopic alidade

[¦tel·ə¦skäp·ik ′al·ə‚dād]
An alidade used with a plane table, consisting of a telescope mounted on a straightedge ruler, fitted with a level bubble, scale, and vernier to measure angles, and calibrated to measure distances.

Telescopic Alidade


an instrument used in topographic surveying, along with a topographic drawing board, for plotting relief, contours, and ground features on a map. The alidade consists of a rule for drawing straight lines on the drawing board and an upright that supports on the horizontal axis a telescope with stadia hairs and a vertical circle with degree readings for determining angles of slope.


Khrenov, L. S. Geodeziia. Moscow, 1970.