![Sir William Herschel Great 40 foot telescope reflecting telescopes 1785 1789 Observatory House Slough England primary mirror Stock Photo - Alamy Sir William Herschel Great 40 foot telescope reflecting telescopes 1785 1789 Observatory House Slough England primary mirror Stock Photo - Alamy](https://c8.alamy.com/comp/C8NAJN/sir-william-herschel-great-40-foot-telescope-reflecting-telescopes-C8NAJN.jpg)
Sir William Herschel Great 40 foot telescope reflecting telescopes 1785 1789 Observatory House Slough England primary mirror Stock Photo - Alamy
![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 telescope. Old Observatory. Tartu. Estonia, Stock Photo, Picture And Rights Managed Image. Pic. C41-3180799 | agefotostock William Herschel telescope. Old Observatory. Tartu. Estonia, Stock Photo, Picture And Rights Managed Image. Pic. C41-3180799 | agefotostock](https://t1.thpservices.com/previewimage/gallil/8789e12c04696e17a5a90efc2fca0446/c41-3180799.jpg)
William Herschel telescope. Old Observatory. Tartu. Estonia, Stock Photo, Picture And Rights Managed Image. Pic. C41-3180799 | agefotostock
![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
![William Herschel Telescope Slough Herschel Space Observatory - William Herschel Telescope PNG Image | Transparent PNG Free Download on SeekPNG William Herschel Telescope Slough Herschel Space Observatory - William Herschel Telescope PNG Image | Transparent PNG Free Download on SeekPNG](https://www.seekpng.com/png/detail/960-9605371_william-herschel-telescope-slough-herschel-space-observatory-william.png)
William Herschel Telescope Slough Herschel Space Observatory - William Herschel Telescope PNG Image | Transparent PNG Free Download on SeekPNG
![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)
A view of Observatory House in Slough, Berkshire, on the site where astronomer William Herschel once lived
![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
![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
![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)