Alidade



(in plane-tabling) a straightedge having a telescopic sight or other means of sighting parallel to the straightedge.
the entire upper part of a theodolite or transit, including the telescope, its supports, the level vials, the circle-reading device, and the spindle.
Historical Examples

The alidade is a triangular ruler with one or more working scales on it beside other measurements.
Military Instructors Manual James P. Cole and Oliver Schoonmaker

Close by stood an alidade, an instrument for measuring angles.
Historical Miniatures August Strindberg

Your scale is ready to be pasted or transferred to the alidade and each 6.8.
Military Instructors Manual James P. Cole and Oliver Schoonmaker

After he had placed the plane table on a tripod and upon this the alidade, he started to work.
On the Seaboard August Strindberg

noun
a surveying instrument used in plane-tabling for drawing lines of sight on a distant object and taking angular measurements
the upper rotatable part of a theodolite, including the telescope and its attachments

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