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2. Keeble Observatory - Wikipedia

   en.wikipedia.org/wiki/Keeble_Observatory

   The first structure was opened in 1963 and housed a 12-inch Newtonian telescope. This building was razed in 2016. A new taller structure went into service the following year and houses a 40cm Ritchey-Chretien.

3. Newtonian telescope - Wikipedia

   en.wikipedia.org/wiki/Newtonian_telescope

   Newtonian telescope design. A Newtonian telescope is composed of a primary mirror or objective, usually parabolic in shape, and a smaller flat secondary mirror.The primary mirror makes it possible to collect light from the pointed region of the sky, while the secondary mirror redirects the light out of the optical axis at a right angle so it can be viewed with an eyepiece.

4. Powell Observatory - Wikipedia

   en.wikipedia.org/wiki/Powell_Observatory

   Its main telescope is a Ruisinger Newtonian reflector, with a single 30-inch (76 cm) objective (mirror), housed in a dome. The observatory also has a 16-inch (41 cm) telescope for public programs, a computer-controlled 12-inch (30 cm) telescope for research projects and member use, and a small conference/lecture room and visitor center.

5. Stellafane - Wikipedia

   en.wikipedia.org/wiki/Stellafane

   Besides the historic Stellafane "pink clubhouse", the original site includes Porter's uniquely designed Porter Turret Telescope, a 12-inch (300 mm; 30 cm) f/17 Newtonian reflector built in 1930, consisting of an equatorially rotated concrete dome with the telescope mounted on the outside, with the observer on the inside working in heated comfort.

6. Newton's reflector - Wikipedia

   en.wikipedia.org/wiki/Newton's_reflector

   Newton describes a telescope with an objective concave primary mirror diameter of 2 inches (50 mm) 0.3 of an inch thick, ground to fit a sphere that was 25 inches in diameter giving it a radius of 12.5 inches and a focal length of 6.25 inches (158 mm). The mirror was aperture reduced to an effective aperture of 1.3 inches by placing a disk with ...

7. List of largest optical telescopes in the British Isles

   en.wikipedia.org/wiki/List_of_largest_optical...

   13-inch Astrographic Refractor (1890) Merz 12.8-inch Visual Refractor (1859-1893) (this was replaced by the 28 inch Grubb in the onion dome) Thomson 9-inch Photographic Refractor (c.1888) Sheepshanks refractor 6.7-inch (1838) (aka Sheepshanks Equatorial) 6-inch Franklin Adams Camera (1898) Shuckburgh telescope a 4.1-inch aperture Refractor (1791)