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A great refractor was often the centerpiece of a new 19th century observatory, but was typically used with an entourage of other astronomical instruments such as a Meridian Circle, a Heliometer, and Astrograph, and a smaller refractor such as a Comet Seeker or Equatorial.
In 1878, Cooper’s assistant, Andrew Graham, discovered the asteroid 9 Metis with the Comet Seeker.