alidade definition

  • noun:
    • an indication or a sighting apparatus on a plane table, used in angular measurement.
    • A topographic surveying and mapping instrument useful for deciding guidelines, composed of a telescope and connected components.
    • A sighting unit used for calculating perspectives.
    • The percentage of a graduated tool, as a quadrant or astrolabe, carrying the places or telescope, and showing the degrees cut off from the arc associated with tool.
    • A movable supply driving over a graduated group, and holding a vernier or an index: an attachment of numerous tools for calculating angles. See cut under sextant.
    • A straight-edge holding a telescope: an attachment of plane-table for moving to paper the course of every object from the station occupied.
    • additionally written alhidade.
    • surveying tool consisting of the top of movable part of a theodolite including the telescope as well as its accessories
    • surveying instrument combined with a plane dining table for drawing outlines of picture on a distant object as well as for measuring angles

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