William Herschel's reflecting telescope of 40 ft (12 m) focal length, 1789 (1807)
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Product details William Herschel's reflecting telescope of 40 ft (12 m) focal length, 1789 (1807)
William Herschel's reflecting telescope of 40 ft (12 m) focal length, 1789 (1807)
William Herschel's reflecting telescope of 40 ft (12 m) focal length, 1789 (1807). Built by the German-born English astronomer, William Herschel (1738-1822), in the grounds of his home in Slough, Berkshire, this instrument was the largest in the world, with a 4 ft (1.2 m) mirror. Herschel made observations with this telescope, including the discovery of two new moons of Saturn on the first night he used it, but made more use of a smaller 18 inch/46 cm instrument. From The Edinburgh Encyclopaedia. (Edinburgh, 1807-1829).
- Image ref: 1158700
- Oxford Science Archive / Heritage Images
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