#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
  part:  #eyepiece  #object_glass
  subtype:  #reflecting_telescope__reflector  optical telescope consisting of a large concave mirror that produces an image that is magnified by the eyepiece
     subtype:  #Cassegrainian_telescope__Gregorian_telescope  a reflecting telescope that has a paraboloidal primary mirror and a hyperboloidal secondary mirror; light is brought to a focus through an aperture in the center of the primary mirror
     subtype:  #coude_telescope__coudetelescope__coude_system__coudesystem  a reflecting telescope so constructed that the light is led to a plate holder or spectrograph
     subtype:  #Herschelian_telescope__off-axis_reflector  a reflecting telescope with the mirror slightly tilted to throw the image to the side where it can be viewed
     subtype:  #Maksutov_telescope  reflecting telescope in which the aberration of the concave mirror is reduced by a meniscus lens
     subtype:  #Newtonian_telescope__Newtonian_reflector  reflecting telescope in which the image is viewed through an eyepiece perpendicular to main axis
     subtype:  #Schmidt_telescope__Schmidt_camera  reflecting telescope that has plate that corrects for aberration so a wide area of sky can be photographed
  subtype:  #refracting_telescope  optical telescope that has a large convex lens that produces an image that is viewed through the eyepiece
     subtype:  #field_glass__fieldglas__glass__glas__spyglas  a small refracting telescope
     subtype:  #Galilean_telescope  a type of refracting telescope that is no longer used in astronomy

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