#optical_telescope__opticaltelescope  an astronomical telescope designed to collect and record light from cosmic sources
  supertype:  astronomical_telescope  any telescope designed to collect and record electromagnetic radiation from cosmic sources
  subtype:  reflecting_telescope  refracting_telescope
  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"
  part:  object_glass__objective  the lens or system of lenses nearest the object being viewed

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