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n. - Surveying instrument used with a plane table for drawing lines of sight on a distant object and for measuring angles; Surveying instrument consisting of the upper movable part of a theodolite including the telescope and its attachments.

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Usage examples (26)
  • The alidade is a triangular ruler with one or more working scales on it beside other measurements.
  • The mariner sighted the objects along a rule called an alidade.
  • His foot caught on it in mid-leap, and he stumbled out onto the bridge wing, fetching up against the alidade.
  • Surveyors would place an alidade on the plane table and sight along it to a particular object, then draw a line to indicate the bearing.
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