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An 18th-century brass reflecting telescope with a 4.5 inch mirror (112 mm). 26-inch (66cm) long tube covered with ray skin.
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Discovery of the principle of the telescope, 17th century - Stock Image - C045/5823 - Science Photo Library
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Was the telescope, a tool we attribute to Galileo in the 17th century, actually an innovation conceived millions of years ago? | Futurism
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Galileo's first telescopes; 17th century, in the Institute and Museum of the History of Science, Florence. [1000x1500] : r/ArtefactPorn
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A telescope from the first half of the seventeenth century – A scientific instrument made of ivory | Die Welt der Habsburger
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