alidad

Noun
  1. Surveying instrument consisting of the upper movable part of a theodolite including the telescope and its attachments (synset 102699881)
    is a type of: surveying instrument, surveyor's instrument - an instrument used by surveyors
    is a part of: theodolite, transit - a surveying instrument for measuring horizontal and vertical angles, consisting of a small telescope mounted on a tripod
    same as: alidade
  2. Surveying instrument used with a plane table for drawing lines of sight on a distant object and for measuring angles (synset 102699702)
    is a type of: surveying instrument, surveyor's instrument - an instrument used by surveyors
    same as: alidade

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