#sight.optical_instrument  a optical instrument for aiding the eye in aiming, as on a firearm or surveying instrument
  supertype:  #optical_instrument__opticalinstrument  an instrument designed to aid vision
  part:  #eyepiece
  part of:  #firearm  #surveying_instrument
  subtype:  #bombsight  a sighting device in an aircraft for aiming bombs
  subtype:  #gunsight  a sight used for aiming a gun
     subtype:  #battlesight  an arrangement of sights that makes possible the rapid aiming of a firearm at short ranges
     subtype:  #open_sight  rear gunsight having an open notch instead of a peephole or telescope
     subtype:  #panoramic_sight__panoramicsight  gunsight (a telescopic device for an artillery piece) that can be rotated horizontally in a full circle
     subtype:  #peep_sight  rear gunsight having an adjustable eyepiece with a small aperture through which the front sight and the target are aligned
     subtype:  #telescopic_sight__telescope_sight  gunsight consisting of a telescope on a firearm for use as a sight

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