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List of largest optical telescopes in the 18th century

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A reflecting telescope by James Short; this English telescope maker produced almost 1400 Gregorian reflectors in the mid-1700s. Mobile versions were used to observe the Transit of Venus.

List of largest optical telescopes in the 18th century includes various refractors and reflectors that were active some time between about 1699 to 1801. It is oriented towards astronomy, not terrestrial telescopes (e.g., spyglasses).

Many of the largest were metal mirror reflectors, some of which had substational apertures even for the 20th century. One problem was that many instrument makers. including William Herschel, did not pass on their mirror-making craft, and by the next century reflectors had largely been passed over in favour of small achromats (2-lens refractors). It was not until the 20th century that really large reflectors would predominate once again.

The major breakthrough in the 18th century was the perfection of two and even three lens refractor telescopes, as well as the increased number of reflectors using polished metal mirrors rather than metal-coated glass, which was not developed until the mid-19th century.

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 have survived.


Legend


Name(s) Aperture
cm (in) 		Type Significance Location then/Original Site Extant*
Herschel 40-foot (1.26 m diameter) 126 cm(49.5") Reflector World's largest 1789;
Mimas & Enceladus discovery telescope		 Observatory House, Slough, England 1789–1815
Reverend John Michell's Gregorian reflector 75 cm (29.5") Reflector – Gregorian World's largest 1780 Yorkshire, Great Britain 1780–1789
Herschel "X Feet" or "Large 10 Feet" 61 cm (24") Reflector England 1800
Father Noel's Gregorian reflector 60 cm (23.5") Reflector – Gregorian World's largest 1761; 1796 Newtonian conversion Paris, France 1761-1841
James Short Gregorian reflector 50 cm (19.5") Reflector – Gregorian World's largest 1750 Scotland 1750
Schröter 27 foot Newtonian 47 cm (18.5") Reflector Lilienthal, Lower Saxony (Germany) 1793–1813
Herschel 20-foot 47 cm (18.5") Reflector Observatory House; England 1782
James Short Reflector for King of Spain 46 cm (18.1") Reflector – Gregorian Spain 1752
James Short's Gregorian reflector 38 cm (14") Reflector – Gregorian World's largest 1734 Scotland 1734
Huygens aerial for Royal Society of London 19 cm (7.5") aerial London, England 1691–1786
William Herschel 7-foot 16 cm (6.3") Reflector Used to discover Georgium Sidus (Uranus) England 1776–1783
Hadley's Reflector 15 cm (6") Reflector First parabolic newtonian England 1721
Van Deyl of Amsterdam telescope 11.4 cm (4.5") achromat England 1781
James Short 4.5 inch reflector 11.4 cm (4.5") reflector England 1737
Shuckburgh telescope 10 cm (4.1") achromat First large equatorial Warwickshire, England 1791–1923
Dollond Apochromatic Triplet 9.53 cm (3.75") apochromat First apochromatic triplet England 1763
Dollond Triplet for Wollaston 9.02 cm triple lens RAS No. 16 England 1771
Francesco Bianchini's aerial telescope 6.6 cm (2.6") aerial Rome, Italy 1726
Chester Moore Hall's Doublet 6.4 cm (2.5") achromat First achromatic doublet England 1733
Troughton Equatorial Telescope 5.08 cm (2") achromat Equatorial mount Armagh Observatory, Ireland 1795
Newton's reflector (1st) 3.3 cm (1.3") Reflector First reflecting telescope England 1668–1704

* (First light or Build Completion to Inactive or Deconstruction)

Gallery

The 40-foot (12 m) telescope

See also

References

  1. "Original mirror for William Herschel's 40 foot telescope, 1785". Science & Society Picture Library. Retrieved 22 November 2008.
  2. ^ Henry C. King (2003). The History of the Telescope. Courier Corporation. p. 91. ISBN 978-0-486-43265-6.
  3. ^ Henry C. King (2003). The History of the Telescope. Courier Corporation. p. 135. ISBN 978-0-486-43265-6.
  4. Constance Ann Lubbock; lady Constance Ann Herschel Lubbock (1933). The Herschel Chronicle: The Life-story of William Herschel and His Sister, Caroline Herschel. CUP Archive. p. 92.
  5. King, Henry C. (2003-01-01). The History of the Telescope. Courier Corporation. ISBN 9780486432656.
  6. "William Herschel (1738-1822)". www.maa.clell.de.
  7. "Exhibitions". National Air and Space Museum. 27 April 2016.
  8. ^ Paul Schlyter, Largest optical telescopes of the world
  9. Christa Jungnickel; Russell K. McCormmach (1996). Cavendish. American Philosophical Society. pp. 306–308. ISBN 978-0-87169-220-7.
  10. "Telescope: Hadley's Reflector". history.amazingspace.org.
  11. The Horological Journal. October 1876. p. 20.
  12. "James Short's Reflecting Telescopes".
  13. "Refracting telescope on equatorial mounting, 1791;". webarchive.nationalarchives.gov.uk. Archived from the original on 2012-03-08.
  14. ^ "1948PA.....56...75K Page 83". articles.adsabs.harvard.edu.
  15. "1980JBAA...90..422D Page 425".
  16. Dall, H. E.; Hysom, E. J.; Ronan, C. A. (1980). "1980JBAA...90..422D Page 422". Journal of the British Astronomical Association. 90: 422. Bibcode:1980JBAA...90..422D. Retrieved 2019-10-16.
  17. Moore, P. (1985). "1985JBAA...95...50M Page 50". Journal of the British Astronomical Association. 95: 50. Bibcode:1985JBAA...95...50M.
  18. "Armagh Observatory". Archived from the original on 2010-02-11. Retrieved 2010-09-17.
  19. ^ Henry C. King (2003). The History of the Telescope. Courier Corporation. p. 74. ISBN 978-0-486-43265-6.

Further reading

External links

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