#surveying_instrument__surveyinginstrument__surveyor's_instrument  an instrument used by surveyors
  supertype:  instrument  a device that requires skill for proper use
  subtype:  alidade  alidad  clinometer  plane_table  range_pole  surveyor's_level  theodolite
  part:  sight.optical_instrument  a optical instrument for aiding the eye in aiming, as on a firearm or surveying instrument
     part:  eyepiece__ocular  combination of lenses at the viewing end of optical instruments
        part:  reticle__graticule  a network of fine lines, dots, cross hairs, or wires in the focal plane of the eyepiece of an optical instrument
           part:  cross_hair__crosshair__cross_wire__crosswire  either of two fine mutually perpendicular lines that cross in the focus plane of an optical instrument and are use for sighting or calibration; "he had the target in his cross hairs"

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