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List of largest optical telescopes in the 18th century ：ウィキペディア英語版

List of largest optical telescopes in the 18th century
List of largest optical telescopes in the 18th century, are listings of what were, for the time period of the 18th century, large optical telescopes. The list includes various refractor and reflector that were active some time between about 1699 to 1801. It is oriented towards astronomy, not terrestrial telescopes (e.g. spyglass).
==Selected Reflectors & Refractors==
The main telescope technologies during this period were refractors with non-achromatic objectives (single lens), speculum metal reflectors, refractors with achromatic doublets objective (doublet lens), and apochromatic triplets (after 1760s) objectives. The list is inherently limited by what examples and records survived.

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&s=S1&viewby=images&">Refracting telescope on equatorial mounting, 1791 )〕 || Warwickshire, England || 1791–1923
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| Dollond Apochromatic Triplet〔(Title: The invention and early development of the achromatic telescope, Authors: King, H. C., Journal: Popular Astronomy, Vol. 56, p.75, Bibliographic Code: 1948PA.....56...75K, Page 83 )〕 || 9.53 cm (3.75″) || apochromat || First apochromatic triplet || England || 1763〔
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| Francesco Bianchini's aerial telescope〔(Moore, P, "The Mapping of Venus", BRITISH ASTRON. ASSOC. JOURNAL V. 95, NO.2/FEB, P. 50, 1985 )〕 || 6.6 cm (2.6") || aerial || || Rome, Italy || 1726
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| Chester Moore Hall's Doublet〔 || 6.4 cm (2.5") || achromat || First achromatic doublet || England || 1733
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| Troughton Equatorial Telescope〔http://www.arm.ac.uk/history/troughton/frames.html〕 || 5.08 cm (2") || achromat || Equatorial mount || Armagh Observatory, Ireland || 1795
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| Newton's reflector〔(The History of the Telescope By Henry C. King, Page 74 )〕 (1st) || 3.3 cm (1.3") || Reflector || First reflecting telescope || England || 1668-1704〔
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