![Engraving depicting William Herschel's giant telescope which had a focal length of 40-feet. William Herschel (1738-1822) a German-born British astronomer and composer. Dated 19th century Stock Photo - Alamy Engraving depicting William Herschel's giant telescope which had a focal length of 40-feet. William Herschel (1738-1822) a German-born British astronomer and composer. Dated 19th century Stock Photo - Alamy](https://c8.alamy.com/comp/MR77KC/engraving-depicting-william-herschels-giant-telescope-which-had-a-focal-length-of-40-feet-william-herschel-1738-1822-a-german-born-british-astronomer-and-composer-dated-19th-century-MR77KC.jpg)
Engraving depicting William Herschel's giant telescope which had a focal length of 40-feet. William Herschel (1738-1822) a German-born British astronomer and composer. Dated 19th century Stock Photo - Alamy
![File:La Palma - Observatorio del Roque de los Muchachos - Telescopio William Herschel - 01.jpg - Wikimedia Commons File:La Palma - Observatorio del Roque de los Muchachos - Telescopio William Herschel - 01.jpg - Wikimedia Commons](https://upload.wikimedia.org/wikipedia/commons/thumb/0/01/La_Palma_-_Observatorio_del_Roque_de_los_Muchachos_-_Telescopio_William_Herschel_-_01.jpg/1200px-La_Palma_-_Observatorio_del_Roque_de_los_Muchachos_-_Telescopio_William_Herschel_-_01.jpg)
File:La Palma - Observatorio del Roque de los Muchachos - Telescopio William Herschel - 01.jpg - Wikimedia Commons
![Color enhanced illustration of a telescope, the largest of its time, built by German-British astronomer Sir Frederick William Herschel (1738-1822). He discovered the planet Uranus in 1781, resulting in his appointment as Color enhanced illustration of a telescope, the largest of its time, built by German-British astronomer Sir Frederick William Herschel (1738-1822). He discovered the planet Uranus in 1781, resulting in his appointment as](https://c8.alamy.com/comp/G15KHK/color-enhanced-illustration-of-a-telescope-the-largest-of-its-time-G15KHK.jpg)
Color enhanced illustration of a telescope, the largest of its time, built by German-British astronomer Sir Frederick William Herschel (1738-1822). He discovered the planet Uranus in 1781, resulting in his appointment as
![William Herschel Telescope Herschel Space Observatory Reflecting telescope, structure, art png | PNGEgg William Herschel Telescope Herschel Space Observatory Reflecting telescope, structure, art png | PNGEgg](https://e7.pngegg.com/pngimages/382/122/png-clipart-william-herschel-telescope-herschel-space-observatory-reflecting-telescope-others-structure-art-thumbnail.png)
William Herschel Telescope Herschel Space Observatory Reflecting telescope, structure, art png | PNGEgg
![El potente espectrógrafo WEAVE del Telescopio William Herschel ayudará a crear un mapa tridimensional de la Vía Láctea El potente espectrógrafo WEAVE del Telescopio William Herschel ayudará a crear un mapa tridimensional de la Vía Láctea](https://static.eldiario.es/clip/eccb1afb-edc7-440f-9a10-8a82bfdb55cc_16-9-aspect-ratio_default_0.jpg)
El potente espectrógrafo WEAVE del Telescopio William Herschel ayudará a crear un mapa tridimensional de la Vía Láctea
![Archivo:William Herschel's Twenty-Foot Reflecting Telescope HIN430.jpg - Wikipedia, la enciclopedia libre Archivo:William Herschel's Twenty-Foot Reflecting Telescope HIN430.jpg - Wikipedia, la enciclopedia libre](https://upload.wikimedia.org/wikipedia/commons/a/a0/William_Herschel%27s_Twenty-Foot_Reflecting_Telescope_HIN430.jpg)
Archivo:William Herschel's Twenty-Foot Reflecting Telescope HIN430.jpg - Wikipedia, la enciclopedia libre
![La coupole abritant le télescope William Herschel - Picture of Observatorium Roque de Los Muchachos, La Palma - Tripadvisor La coupole abritant le télescope William Herschel - Picture of Observatorium Roque de Los Muchachos, La Palma - Tripadvisor](https://media-cdn.tripadvisor.com/media/photo-s/0f/b3/02/f4/telescopio-espanol.jpg)