alidade








noun Surveying.

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

noun

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

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