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Herschel's 40 foot telescope, 19th Century illustration

Herschel's 40 foot telescope, 19th Century illustration

C048/2017

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3359 x 3122 pixels

28.4 x 26.4 cm ⏐ 11.2 x 10.4 in (300dpi)

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COLLECTION ABECASIS / SCIENCE PHOTO LIBRARY COLLECTION ABECASIS / SCIENCE PHOTO LIBRARY

Caption

Herschel's 40 foot telescope. 1891 illustration of a telescope, the largest of its time, designed by the German-British astronomer Sir Frederick William Herschel (1738-1822). The telescope, with a tube 40 foot (12 metres) long, was located at Observatory House in Slough, England, UK. Observations began on 28 August 1789, and two new moons of Saturn (Enceladus and Mimas) were discovered. The telescope was moved by an assistant in the hut (lower left). Herschel would make his observations from the platform (right) at the front of the telescope, looking down the tube at the mirror, which was made of polished metal, not glass. The telescope cost 4000 pounds to build, and was dismantled in 1839.

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