![William Herschel's reflecting telescope of 40 ft (12 m) focal length, 1789 (1807). Artist: Unknown Stock Photo - Alamy William Herschel's reflecting telescope of 40 ft (12 m) focal length, 1789 (1807). Artist: Unknown Stock Photo - Alamy](https://c8.alamy.com/comp/AJA4RF/william-herschels-reflecting-telescope-of-40-ft-12-m-focal-length-AJA4RF.jpg)
William Herschel's reflecting telescope of 40 ft (12 m) focal length, 1789 (1807). Artist: Unknown Stock Photo - Alamy
![William Herschel 40 Foot Telescope, 1880s Poster Print by Science Source - Item # VARSCIBU9002 - Posterazzi William Herschel 40 Foot Telescope, 1880s Poster Print by Science Source - Item # VARSCIBU9002 - Posterazzi](https://cdn11.bigcommerce.com/s-yzgoj/images/stencil/1280x1280/products/1490542/2021439/apiaxgpet__74171.1627199642.jpg?c=2)
William Herschel 40 Foot Telescope, 1880s Poster Print by Science Source - Item # VARSCIBU9002 - Posterazzi
![astronomy, instruments, the 40 foot telescope of William Herschel, wood engraving, 19th century, instrument, science, Great Britain, 18th century, historic, historical Stock Photo - Alamy astronomy, instruments, the 40 foot telescope of William Herschel, wood engraving, 19th century, instrument, science, Great Britain, 18th century, historic, historical Stock Photo - Alamy](https://c8.alamy.com/comp/B5M66D/astronomy-instruments-the-40-foot-telescope-of-william-herschel-wood-B5M66D.jpg)
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![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
![Early photograph of William Herschel's telescope at Slough, 1839. by Herschel, John F W (John Frederick William), Sir at Science and Society Picture Library Early photograph of William Herschel's telescope at Slough, 1839. by Herschel, John F W (John Frederick William), Sir at Science and Society Picture Library](https://s3-eu-west-1.amazonaws.com/lowres-picturecabinet.com/43/main/3/82139.jpg)
Early photograph of William Herschel's telescope at Slough, 1839. by Herschel, John F W (John Frederick William), Sir at Science and Society Picture Library
![William Herschel's 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 Stock William Herschel's 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 Stock](https://l450v.alamy.com/450v/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 arts, sciences, and literature; Volume XVII; Edited by Wilkes, John. Published in London in 1820 Stock
William Herschels 40foot Telescope Built 178589 Wood Engraving Published 1877 Stock Illustration - Download Image Now - iStock
![a William and Caroline Herschel's 40-foot telescope in Slough, England,... | Download Scientific Diagram a William and Caroline Herschel's 40-foot telescope in Slough, England,... | Download Scientific Diagram](https://www.researchgate.net/publication/334758949/figure/fig1/AS:786192975028225@1564454420939/a-William-and-Caroline-Herschels-40-foot-telescope-in-Slough-England-1789-1-b-Two_Q320.jpg)
a William and Caroline Herschel's 40-foot telescope in Slough, England,... | Download Scientific Diagram
![The Forty-Foot Telescope at Slough. Photographed by Sir John F.W. Herschel [photographed 9 September 1839; this print made in] August 1890 de HERSCHEL, Sir John Frederick William: Signed by Author(s) | Jonathan The Forty-Foot Telescope at Slough. Photographed by Sir John F.W. Herschel [photographed 9 September 1839; this print made in] August 1890 de HERSCHEL, Sir John Frederick William: Signed by Author(s) | Jonathan](https://pictures.abebooks.com/inventory/30101775252_2.jpg)
The Forty-Foot Telescope at Slough. Photographed by Sir John F.W. Herschel [photographed 9 September 1839; this print made in] August 1890 de HERSCHEL, Sir John Frederick William: Signed by Author(s) | Jonathan
![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
![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
![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/c0482017-400px-wm.jpg)