"Night view of William Herschel's forty-foot reflecting telescope," from "The Wonders of the Heavens" 1837 (archive.org/details/wondersofh…).

Unknown engraver, Public domain, via Wikimedia Commons.

#telescope

"Refracting telescope with 5.9-inch aperture lens by Charles Tully, brass tube and English type equatorial mounting by George Dollond and clockwork drive. Made for Captain W.H.Smyth in 1828, who observed from Bedford and gave the telescope to Dr John Lee..."

Science Museum Group, CC BY-SA 4.0 via Refracting telescope with 5.9-inch aperture lens, brass tube and English type equatorial mounting and clockwork. 1929-949 Science Museum Group Collection Online. collection.sciencemuseumgroup.…

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"Troughton and Simms Astronomical Telescope; one of the Important Cultural Properties of Japan; exhibit in the National Museum of Nature and Science, Tokyo, Japan."

Momotarou2012, CC BY-SA 3.0, via Wikimedia Commons.

#telescope

"Replica of Newton's first reflecting telescope made in 1668 and now in the possession of the Royal Society of London. Made for the Science Museum in 1924 by Mr F.L. Agate."

Science Museum Group, CC BY-SA 4.0 via Isaac Newton’s reflecting telescope (replica). Science Museum Group Collection Online. collection.sciencemuseumgroup.…

#telescope

"Engraving from Smith's Illustrated Astronomy from 1848 of the Cincinnati Observatorys 11 inch Merz and Mahler refracting telescope installed in 1843."

Smith's Illustrated Astronomy, Public domain, via Wikimedia Commons.

#telescope

"The Great Refractor of the Astrophysical Observatory Potsdam (AOP), Germany; it was finished in 1899."

H. Raab (User:Vesta), CC BY-SA 4.0, via Wikimedia Commons.

#telescope

The Wonderful Universe Explorer, The Great 36-inch Equatorial Telescope, Lick Observatory, Mt. Hamilton, California (1902).

Underwood & Underwood, CC0, via Wikimedia Commons. Color edits.

#telescope

"Robert Hooke and Astronomers at Gresham College," by Rita Greer (2008).

Rita Greer, FAL, via Wikimedia Commons.

#telescope

Great Melbourne Telescope, South Yarra, Victoria (~1870).

Museums Victoria, Public Domain (Licensed as Public Domain Mark). Color edits.

collections.museumsvictoria.co…

#telescope

"This photograph documents the Pretoria 74 inch Reflector, built for the Pretoria observatory at some time in the early 20th Century."

Tyne and Wear Archives and Museums, No restrictions, via Wikimedia Commons.

#telescope

"Made for the Science Museum in 1892, this is a model, scale 1:5, of the Coude (elbow) Telescope built for the Paris Observatory in 1882."

Science Museum Group, CC BY-NC-SA 4.0 via Scale model of Loewy's Coude (elbow) Telescope, 1892. 1892-5 Science Museum Group Collection Online. collection.sciencemuseumgroup.…

#telescope

"This is the 100 inch (2.5 M.) Hooker Telescope at the Mount Wilson Observatory in Los Angeles County, California."

Ken Spencer, CC BY-SA 3.0, via Wikimedia Commons.

#telescope

The Clark Telescope at Lowell Observatory in Flagstaff, Arizona; built in 1896; photo by Carol M Highsmith; marked with CC0 1.0.

#telescope

"18 inch (46cm) Newtonian reflector telescope erected by British astronomer Andrew Ainslie Common in his garden shed around 1876 at his house in Ealing, near London, England" (~1880).

Museums Victoria, Public domain, via Wikimedia Commons.

#telescope

Sketch of the 15-inch Great Refractor telescope at Harvard College Observatory.

A. Sonrel, Public domain, via Wikimedia Commons.

#telescope

"The mirror of the 200-inch Hale telescope at Mt. Palomar Observatory, California in the Caltech Optical Shop in Pasadena when grinding work was resumed following the end of World War 2" (December 4, 1945).

Paul Calvert, Los Angeles Times, Public domain, via Wikimedia Commons.

#telescope

The Great Telescope, (of 52 feet focus, 6 feet clear opening of speculum) erected at Birr Castle in Ireland, by the Earl of Rosse, president of the Royal Society; Lord Rosse directing the conveyance of the Great Speculum to its position at the Base of the Tube, North Side; by William Bevan after Miss Henrietta M. Crompton, with figures by Herbert C. Herries.

Wellcome Collection, Public Domain via wellcomecollection.org/works/m…

Color and cropping edits.

#telescope

Reproduction of a design of the interior of the Paris Observatory at Meudon - The Grand Equatorial.

Rijksmuseum, Public Domain via hdl.handle.net/10934/RM0001.CO…

Color and cropping edits.

#telescope

Astronomical Observatory of the Roman Archigymnasium on the Capitoline Hill.

Science Museum Group, CC BY-SA 4.0 via Osservatorio Astronomico dell' Archiginnasio Romano sul Campidoglio. Veduta 2a. Nd. 1985-1894 Science Museum Group Collection Online. collection.sciencemuseumgroup.…

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"The great refracting Telescope constructed at Dublin for the Vienna Observatory," by W. I. Mosses (1881).

Wellcome Collection, Public Domain via wellcomecollection.org/works/d…

Color edits.

#telescope

"The Yerkes Telescope. Color plate by Charles S. Graham from The World's Fair in Water Colors. Size of original document approximately 8.8 x 11 inches. 1893."

The Field Museum Library, No restrictions, via Wikimedia Commons or Flickr: flic.kr/p/6bRABx

#telescope

Cassegrain reflecting telescope of 6 inch aperture by Jesse Ramsden (~1762-1774).

Science Museum Group, CC BY-SA 4.0 via Cassegrain reflecting telescope, 1762-1774. 1913-281 Science Museum Group Collection Online. collection.sciencemuseumgroup.…

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"Dated to about 1783-5, this reflecting telescope was made by the famous astronomer, William Herschel for his good friend Dr Watson who he first met in Bath."

Science Museum Group, CC BY-SA 4.0 via Reflecting telescope by William Herschel. 1876-1000 Pt1 Science Museum Group Collection Online. collection.sciencemuseumgroup.…

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"Photograph of a reflecting telescope with silvered glass mirror of 1.20 metres at the Paris Observatory."

Science Museum Group, CC BY-SA 4.0 via Photograph of a reflecting telescope. 1884-23 Science Museum Group Collection Online. collection.sciencemuseumgroup.…

Color edits.

#telescope