antik.it/Nautical-antiques/7890-Antique-Telescope/
1710002458Code 7890 Antique TelescopeRound section brass telescope with splayed shape and leather covered handle, signed Ross London n. 34080 from the late 19th century. Focusing with three extensions, complete with sun visor extension. Maximum length 83.3 cm, 32.7 inches, minimum 26.0 cm, 10.2 inches, focal diameter 6 cm – 2.4 inches. In good condition, some dents on the leather of the handle
fully functional and complete with custom-made wooden and brass support base.
To focus the telescope you need to extend it completely and then slowly shorten the last extension, the smallest one, until the image is in focus.
Andrew Ross was a London optical instrument maker, who began his business about 1830; he was particularly known for his achromatic lenses From 1840 onwards he began making camera lenses for the early pioneers of photography. From 1878 the Ross family business expanded further, becoming a large-scale lens manufacturing company.
According to legend, one unspecified day in 1608 the children of Hans Lipperhey, who was an eyeglass maker from Middelburg, were playing with lenses in their father's workshop. When one of the sons placed a concave lens near his eye, holding a convex lens in the other hand, and holding out his arm towards the tip of the bell tower of the cathedral, looked through it, he saw the weathercock that was on the top grow bigger and get closer. . Having immediately shown the phenomenon to his father, he fixed the lenses on a board to make observation easier, thus creating the first rudimentary telescope. Unfortunately for Lipperhey, however, when he presented a patent request for this instrument to the States General, within a few days other Dutch eyeglass makers also claimed the invention.
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Code 7890 Antique Telescope
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