Ten historic telescopes shown with verified Wikimedia Commons photographs: museum tubes, reflectors, refractors, and observatory instruments. Photograph credits: 1. File:17th century telescopes in Galileo Museum 0640.jpg; C messier; CC BY 4.0; https://creativecommons.org/licenses/by/4.0; https://commons.wikimedia.org/wiki/File:17th_century_telescopes_in_Galileo_Museum_0640.jpg; 2. File:18th century telescopes in Galileo Museum 0664.jpg; C messier; CC BY 4.0; https://creativecommons.org/licenses/by/4.0; https://commons.wikimedia.org/wiki/File:18th_century_telescopes_in_Galileo_Museum_0664.jpg; 3. File:Reflecting telescope, after Isaac Newton, photo-1.JPG; AlfvanBeem; CC0; http://creativecommons.org/publicdomain/zero/1.0/deed.en; https://commons.wikimedia.org/wiki/File:Reflecting_telescope%2C_after_Isaac_Newton%2C_photo-1.JPG; 4. File:Reflecting Telescope after Isaac Newton by William Herschel from Slough 1790 - Teylers Oval Room.jpg; Jane023 ( talk ) 23:49, 27 January 2012 (UTC); CC BY 3.0 nl; https://creativecommons.org/licenses/by/3.0/nl/deed.en; https://commons.wikimedia.org/wiki/File:Reflecting_Telescope_after_Isaac_Newton_by_William_Herschel_from_Slough_1790_-_Teylers_Oval_Room.jpg; 5. File:Small Gregorian Reflecting Telescope with shagreen (Science Museum).jpg; Science Museum Photo Studio; CC BY 4.0; https://creativecommons.org/licenses/by/4.0; https://commons.wikimedia.org/wiki/File:Small_Gregorian_Reflecting_Telescope_with_shagreen_%28Science_Museum%29.jpg; 6. File:James Nasmyth's telescope science museum.JPG; Geni; CC BY-SA 4.0; https://creativecommons.org/licenses/by-sa/4.0; https://commons.wikimedia.org/wiki/File:James_Nasmyth%27s_telescope_science_museum.JPG; 7. File:Kraus Merz refractor.jpg; Anonymous Unknown author; Public domain; ; https://commons.wikimedia.org/wiki/File:Kraus_Merz_refractor.jpg; 8. File:Grande Lunette de l'Observatoire de Meudon.jpg; Serge Golovanow; CC BY-SA 3.0; https://creativecommons.org/licenses/by-sa/3.0; https://commons.wikimedia.org/wiki/File:Grande_Lunette_de_l%27Observatoire_de_Meudon.jpg; 9. File:Yerkes 40 inch Refractor Telescope-1897.jpg; Unknown author Unknown author; Public domain; ; https://commons.wikimedia.org/wiki/File:Yerkes_40_inch_Refractor_Telescope-1897.jpg; 10. File:Great Melbourne Telescope 1869.JPG; Museum Victoria, Australia; Public domain; ; https://commons.wikimedia.org/wiki/File:Great_Melbourne_Telescope_1869.JPG;