#surveying_instrument__surveyinginstrument__surveyor's_instrument  an instrument used by surveyors
  supertype:  #instrument  a device that requires skill for proper use
  part:  #sight.optical_instrument
  subtype:  #alidade__alidad  surveying instrument used with a plane table for drawing lines of sight on a distant object and for measuring angles
  subtype:  #alidad__alidade  surveying instrument consisting of the upper movable part of a theodolite including the telescope and its attachments
  subtype:  #clinometer__inclinometer  an instrument used by surveyors in order to measure an angle of inclination or elevation
  subtype:  #plane_table__planetable  surveying instrument consisting of a drawing board and a ruler that are mounted on a tripod; used to sight and map topographical details
  subtype:  #range_pole__rangepole__ranging_pole__rangingpole__flagpole  surveying instrument consisting of a straight rod painted in bands of alternate red and white each one foot wide; used for sightings by surveyors
  subtype:  #surveyor's_level  surveying instrument consisting basically of a small telescope with an attached spirit level rotating around a vertical axis; for measuring relative heights of land
     subtype:  #Abney_level  a surveying instrument consisting of a spirit level and a sighting tube; used to measure the angle of inclination of a line from the observer to the target
     subtype:  #Dumpy_level  a surveyor's level having a short telescope fixed to a horizontally rotating table and a spirit level
  subtype:  #theodolite__transit  a surveying instrument for measuring horizontal and vertical angles, consisting of a small telescope mounted on a tripod
     subtype:  #tachymeter__tacheometer  a theodolite designed for rapid measurements

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