
Telescope At The Paris Observatory

by Science Source
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Telescope At The Paris Observatory
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Science Source
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Photograph - Photograph
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Paris telescope. Newtonian reflecting telescope installed at the Paris Observatory, France, during the 1860s. It had a 1.2 meter (48 inch) diameter mirror. This was the first large telescope mirror to be made of glass coated with silver deposited chemically in a method devised by the German chemist Justus von Liebig. The mirror was much better than those made of polished copper alloy, but the telescope's poor mounting made it nearly useless.
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February 19th, 2013
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