ROYAL ASTRONOMICAL SOCIETY / SCIENCE PHOTO LIBRARY ROYAL ASTRONOMICAL SOCIETY / SCIENCE PHOTO LIBRARY
Twin cassegrain telescope. Cassegrain telescopes, named after the 17th-century French priest Laurent Cassegrain, are a type of reflector telescope that combine the use of lenses and mirrors. This is the twin 16-inch cassegrain telescope, which was made by the telescope manufacturers Grubb Parsons in 1962. Photographed at the Royal Observatory, Edinburgh, Scotland.
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