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List of largest optical telescopes in the 19th century
List of largest optical telescopes in the 19th century, are listings of what were, for the time period of the 19th century large optical telescopes. See List of largest optical telescopes in the 20th century for the 1900s. The list includes various refractor and reflector that were active some time between about 1799 to 1901.
==Reflectors & Refractors==
Early reflectors using speculum metal had some of the record-breaking apertures of the day, but not necessarily high performance. Starting in the 1860s metal coated glass ('Silver on glass') reflector telescopes proved more durable, for example the Crossley Reflector, which continued to be used and upgraded even into the 21st century. Telescopes with lenses, especially achromatic doublets were popular in the 19th century. (see also Great Refractor)
(100 cm equals 1 meter)
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* (First light or Build Completion to Inactive (Retired) or Deconstruction)
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