![William Herschel's 40 foot telescope at Slough, Berkshire, 1795. at Science and Society Picture Library William Herschel's 40 foot telescope at Slough, Berkshire, 1795. at Science and Society Picture Library](https://s3-eu-west-1.amazonaws.com/lowres-picturecabinet.com/43/main/3/82174.jpg)
William Herschel's 40 foot telescope at Slough, Berkshire, 1795. at Science and Society Picture Library
![Amazon.com: Science. Sir W Herschel's Forty-Foot Reflecting Telescope - 1869 - Old Print - Antique Print - Vintage Print - Printed Prints of Science: Posters & Prints Amazon.com: Science. Sir W Herschel's Forty-Foot Reflecting Telescope - 1869 - Old Print - Antique Print - Vintage Print - Printed Prints of Science: Posters & Prints](https://m.media-amazon.com/images/I/61PcBF+igmL._AC_SX466_.jpg)
Amazon.com: Science. Sir W Herschel's Forty-Foot Reflecting Telescope - 1869 - Old Print - Antique Print - Vintage Print - Printed Prints of Science: Posters & Prints
![Herschel's 40-foot Telescope Canvas Print / Canvas Art by Royal Astronomical Society/science Photo Library Herschel's 40-foot Telescope Canvas Print / Canvas Art by Royal Astronomical Society/science Photo Library](https://render.fineartamerica.com/images/rendered/default/canvas-print/7/8/mirror/break/images-medium-5/herschels-40-foot-telescope-royal-astronomical-societyscience-photo-library-canvas-print.jpg)
Herschel's 40-foot Telescope Canvas Print / Canvas Art by Royal Astronomical Society/science Photo Library
![Sir William Herschel'S Great Forty-Foot Telescope Poster Print By ® Florilegius Mary Evans (18 X 24) - Walmart.com Sir William Herschel'S Great Forty-Foot Telescope Poster Print By ® Florilegius Mary Evans (18 X 24) - Walmart.com](https://i5.walmartimages.com/asr/ed4fbcba-d3be-4f21-8bde-0c3abab993a1_1.5f5640a295b024bb0f8b294d1bb61706.jpeg?odnHeight=612&odnWidth=612&odnBg=FFFFFF)
Sir William Herschel'S Great Forty-Foot Telescope Poster Print By ® Florilegius Mary Evans (18 X 24) - Walmart.com
![Astronomy: a 40-foot telescope constructed by William Herschel, in use outdoors. Coloured etching, 18--. | Wellcome Collection Astronomy: a 40-foot telescope constructed by William Herschel, in use outdoors. Coloured etching, 18--. | Wellcome Collection](https://iiif.wellcomecollection.org/image/V0024766/full/full/0/default.jpg)
Astronomy: a 40-foot telescope constructed by William Herschel, in use outdoors. Coloured etching, 18--. | Wellcome Collection
![William Herschel's 40 foot reflecting telescope Copperplate engraving From the Encyclopaedia Londinensis or, Universal dictionary of William Herschel's 40 foot reflecting telescope Copperplate engraving From the Encyclopaedia Londinensis or, Universal dictionary of](https://c8.alamy.com/comp/2D8CY8R/william-herschels-40-foot-reflecting-telescope-copperplate-engraving-from-the-encyclopaedia-londinensis-or-universal-dictionary-of-arts-sciences-and-literature-volume-xvii-edited-by-wilkes-john-published-in-london-in-1820-2D8CY8R.jpg)
William Herschel's 40 foot reflecting telescope Copperplate engraving From the Encyclopaedia Londinensis or, Universal dictionary of
![Original mirror for William Herschel's 40 foot telescope, 1785. at Science and Society Picture Library Original mirror for William Herschel's 40 foot telescope, 1785. at Science and Society Picture Library](https://s3-eu-west-1.amazonaws.com/lowres-picturecabinet.com/43/main/51/130122.jpg)
Original mirror for William Herschel's 40 foot telescope, 1785. at Science and Society Picture 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)