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20102011181815734Code 178 Gregory telescopeBrass Gregory telescope, very refined, covered by Galuchat leather. It is signed Gonichon Rue des Postes Paris, first half of XVIII century. Very good condition. Measures cm 66x46 - inches 25.98x18.11.
The Gregory telescope, by the name of the English maker James Gregory (1638-1675) that described it in Optica Promota in 1663, so few years before of the telescope made by Newton in 1668, is an antique astronomical instrument with two concave mirrors: the primary mirror catch the light and makes it go to a focus in front of the secondary mirror; this mirror makes go the light to the primary mirror, that has in the centre a hole with eye-piece : the image is straight, not like in Newton telescopes that have an upside-down image, so it can be used for terrestrial observations.
Galuchat leather, by the name of the first user under the kingdom of Louis XV, Jean Claude Galuchat (died in 1774), is a leather of shark or race and because of its cost it was always used for valuable objects.
Jean Baptiste Charles Gonichon worked in Paris between the first and the second half of XVIII century. About in 1733 he joined with Claude Paris, an optician and his brother-in-law; because of his success for his telescopes in the Académie des Sciences, Gonichon and Paris obtained the privilege for make and sell reflection telescopes, becoming marchand miroitier privilégié suivant la Cour.
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Code 178 Gregory telescope
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