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.
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.