Alvan Clark (March 8, 1804 – August 19, 1887), born in Ashfield, Massachusetts, was an American astronomer and telescope maker. He started as a portrait...
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Alvan Graham Clark (July 10, 1832 – June 9, 1897) was an American astronomer and telescope-maker. Alvan Graham Clark was born in Fall River, Massachusetts...
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42°21′19″N 71°06′33″W / 42.35528°N 71.10927°W / 42.35528; -71.10927 Alvan Clark & Sons was an American maker of optics that became famous for crafting...
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he was the son of Alvan Clark, part of a family of refracting telescope makers in the 19th century. In 1846, George Bassett Clark joined his father and...
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named for American astronomer and telescope maker Alvan Clark and his son Alvan Graham Clark. Clark has a narrow inner wall, and thus a wide interior...
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Achromatic lens (section Clark doublet)
ISBN 9780819463074. Warner, Deborah Jean; Ariail, Robert B. (1995). Alvan Clark & Sons, Artists In Optics (2nd ed.). Willmann-Bell. p. 174. Kidger, M...
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telescopes in astronomy. Noted lens makers of the 19th century include: Alvan Clark Brashear Chance Brothers Cauchoix Fraunhofer Gautier Grubb Henry Brothers...
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observing Venus in detail in mid-1896 soon after the 61-centimetre (24-inch) Alvan Clark & Sons refracting telescope was installed at his new Flagstaff, Arizona...
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ast.cam.ac.uk. Retrieved 2019-03-07. "Objekt des Monats: Refraktor von Clark & Sons". bibliothek.univie.ac.at. "Astronomy Program – Jewett Observatory"...
38 KB (1,051 words) - 19:44, 24 April 2024
as the basis for the Double-Gauss lens first proposed in 1888 by Alvan Graham Clark, which is a four-element, four-group compound lens that uses a symmetric...
4 KB (416 words) - 00:42, 8 February 2024