![Autochrome taken in the garden of Observatory House, Slough, 1911. at Science and Society Picture Library Autochrome taken in the garden of Observatory House, Slough, 1911. at Science and Society Picture Library](https://s3-eu-west-1.amazonaws.com/lowres-picturecabinet.com/43/main/23/102614.jpg)
Autochrome taken in the garden of Observatory House, Slough, 1911. at Science and Society Picture Library
![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 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](https://c8.alamy.com/zooms/6/563896243b544939a79d59728f3dde3a/2a7bx77.jpg)
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
![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 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](https://c8.alamy.com/comp/P6EFTN/sir-william-herschels-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-P6EFTN.jpg)
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
![Herschel's 40 foot telescope, 19th Century illustration - Stock Image - C048/2017 - Science Photo Library Herschel's 40 foot telescope, 19th Century illustration - Stock Image - C048/2017 - Science Photo Library](https://media.sciencephoto.com/c0/48/20/17/c0482017-800px-wm.jpg)
Herschel's 40 foot telescope, 19th Century illustration - Stock Image - C048/2017 - Science Photo Library
![William Herschel's 40 foot telescope, also known as the Great Forty Foot telescope, was a reflecting telescope constructed between 1785 and 1789 at Observatory House in Slough, England. It used a 47 William Herschel's 40 foot telescope, also known as the Great Forty Foot telescope, was a reflecting telescope constructed between 1785 and 1789 at Observatory House in Slough, England. It used a 47](https://c8.alamy.com/comp/T964MB/william-herschels-40-foot-telescope-also-known-as-the-great-forty-foot-telescope-was-a-reflecting-telescope-constructed-between-1785-and-1789-at-observatory-house-in-slough-england-it-used-a-47-inch-diameter-primary-mirror-with-a-1200-cm-focal-length-it-was-the-largest-telescope-in-the-world-for-50-years-it-may-have-been-used-to-discover-enceladus-and-mimas-the-6th-and-7th-moons-of-saturn-it-was-dismantled-in-1840-today-the-original-mirror-and-a-10-foot-section-of-the-tube-remain-T964MB.jpg)
William Herschel's 40 foot telescope, also known as the Great Forty Foot telescope, was a reflecting telescope constructed between 1785 and 1789 at Observatory House in Slough, England. It used a 47
![SIR FREDERICK WILLIAM HERSCHEL German-English astronomer's home, Herschel House, at Slough: view from the street Date: 1738 - 1822 Stock Photo - Alamy SIR FREDERICK WILLIAM HERSCHEL German-English astronomer's home, Herschel House, at Slough: view from the street Date: 1738 - 1822 Stock Photo - Alamy](https://c8.alamy.com/comp/G39N52/sir-frederick-william-herschel-german-english-astronomers-home-herschel-G39N52.jpg)
SIR FREDERICK WILLIAM HERSCHEL German-English astronomer's home, Herschel House, at Slough: view from the street Date: 1738 - 1822 Stock Photo - Alamy
![A view of Observatory House in Slough, Berkshire, on the site where astronomer William Herschel once lived A view of Observatory House in Slough, Berkshire, on the site where astronomer William Herschel once lived](http://www.visitoruk.com/images/franchises/Slough/gallery/largegallery_7062.jpg)