Sir WIlliam Herschel's Great Forty-Foot telescope

Sir WIlliam Herschel's Great Forty-Foot telescope.. Sir William Herschel's telescope or the Great Forty-Foot reflecting telescope built between 1785 and 1789 at Observatory House in Slough, England. Copperplate engraving by Wilson Lowry after a drawing by J. Farey from Abraham Rees Cyclopedia or Universal Dictionary of Arts, Sciences and Literature, Longman, Hurst, Rees, Orme and Brown, London, 1820

1785 1789 Cyclopedia Dictionary Farey Herschels Hurst Longman Lowry Observatory Orme Rees Reflecting Slough Telescope

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