Reflecting telescope of 40 ft/12 m focal length, 1789. Built by William Herschel (1738-1822) the German-born English astronomer, this instrument was the largest in the world, had a 4 m mirror. Herschel made observations with this telescope but made more use of a smaller 18 in/46 cm instrument. From 'The Edinburgh Encyclopaedia'. (Edinburgh, 1807-1829). Engraving.

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Reflecting telescope of 40 ft/12 m focal length, 1789. Built by William Herschel (1738-1822) the German-born English astronomer, this instrument was the largest in the world, had a 4 m mirror. Herschel made observations with this telescope but made more use of a smaller 18 in/46 cm instrument. From 'The Edinburgh Encyclopaedia'. (Edinburgh, 1807-1829). Engraving.

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Photo credit: © World History Archive / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: /46, 4, 18, astronomer, cm, edinburgh, encyclopaedia., english, , german-born, herschel, instrument, instrument., largest, mirror., observations, smaller, telescope, world