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An Astroscan wide-field Newtonian reflector. The Astroscan was a wide-field 4 + 1 ⁄ 8 in (10 cm) clear-inch diameter reflecting telescope , originally produced by the Edmund Scientific Corporation , that was for sale from 1976 to 2013.
Pages in category "Reflecting telescopes" The following 50 pages are in this category, out of 50 total. ... Galileo National Telescope; Giant Magellan Telescope;
National Geographic Image Collection, a division of the National Geographic Partners, a joint venture between the National Geographic Society and The Walt Disney Company, headquartered in Washington, D.C., United States, was a stock photography agency that managed and licensed one of the world's most comprehensive and unique collections of photographs and original artwork.
The old Yerkes 24 inch (2 foot telescope) reflecting telescope, now in a museum Diagram of the Bruce astrograph. A 12-inch refractor was moved to Yerkes from Kenwood Observatory in the 1890s. [13] Two other telescopes planned for the observatory in the 1890s were a 12-inch aperture refractor and a 24-inch reflecting telescope. [13]
A reflecting telescope (also called a reflector) is a telescope that uses a single or a combination of curved mirrors that reflect light and form an image. The reflecting telescope was invented in the 17th century by Isaac Newton as an alternative to the refracting telescope which, at that time, was a design that suffered from severe chromatic ...
The main material used early on for reflecting telescope mirrors was speculum metal, which reflected only about two-thirds of the incident light, and which tarnished, requiring maintenance. Two-element refracting telescopes were extensively used in 19th century observatories despite their smaller apertures than metal, and later glass, mirror ...
The beginning of the 20th century saw the worldwide construction of refracting telescopes and sophisticated large reflecting telescopes specifically designed for photographic imaging. Towards the middle of the century, giant telescopes such as the 200 in (5.1 m) Hale Telescope and the 48 in (120 cm) Samuel Oschin telescope at Palomar ...
Ritchey 24" reflecting Telescope. George Willis Ritchey (December 31, 1864 – November 4, 1945) was an American optician and telescope maker and astronomer born at Tuppers Plains, Ohio. [1] [2] Ritchey was educated as a furniture maker. He coinvented the Ritchey–Chrétien (R–C) reflecting telescope along with Henri Chrétien. The R-C ...
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