![William Parsons, 3rd Earl of Rosse (June 17,1800 - October 31, 1867) was an Irish astronomer. He improved the techniques of casting, grinding and polishing large telescope mirrors from speculum metal, and William Parsons, 3rd Earl of Rosse (June 17,1800 - October 31, 1867) was an Irish astronomer. He improved the techniques of casting, grinding and polishing large telescope mirrors from speculum metal, and](https://c8.alamy.com/comp/G14TA9/william-parsons-3rd-earl-of-rosse-june-171800-october-31-1867-was-G14TA9.jpg)
William Parsons, 3rd Earl of Rosse (June 17,1800 - October 31, 1867) was an Irish astronomer. He improved the techniques of casting, grinding and polishing large telescope mirrors from speculum metal, and
![Rob Cross on X: "William Parsons, the 3rd Earl of Rosse with the largest telescope in the world which he designed and built in the early 1840s at Birr Castle, Parsonstown in Rob Cross on X: "William Parsons, the 3rd Earl of Rosse with the largest telescope in the world which he designed and built in the early 1840s at Birr Castle, Parsonstown in](https://pbs.twimg.com/media/E0p44AOWEAA88-v.jpg:large)
Rob Cross on X: "William Parsons, the 3rd Earl of Rosse with the largest telescope in the world which he designed and built in the early 1840s at Birr Castle, Parsonstown in
Reflecting telescope used by William Parsons for observing spiral nebulae | Niels Bohr Library & Archives
![Telescope Parsons 1845 Nthe Great Leviathan Telescope Built in 1845 by The Irish Astronomer William Parsons 3Rd Earl of Rosse Wood Engraving from A ... Telescope Parsons 1845 Nthe Great Leviathan Telescope Built in 1845 by The Irish Astronomer William Parsons 3Rd Earl of Rosse Wood Engraving from A ...](https://m.media-amazon.com/images/I/71eDv91NHWL._AC_UF894,1000_QL80_.jpg)
Telescope Parsons 1845 Nthe Great Leviathan Telescope Built in 1845 by The Irish Astronomer William Parsons 3Rd Earl of Rosse Wood Engraving from A ...
![Photograph by Colonel Harry J Watson showing the Great Rosse Telescope from the southeast. Constructed between 1842 and 1845 by William Parsons, Third... - SuperStock Photograph by Colonel Harry J Watson showing the Great Rosse Telescope from the southeast. Constructed between 1842 and 1845 by William Parsons, Third... - SuperStock](https://www.superstock.com/cdn/1895/Comp/1895-3745.webp)
Photograph by Colonel Harry J Watson showing the Great Rosse Telescope from the southeast. Constructed between 1842 and 1845 by William Parsons, Third... - SuperStock
![Some figures stand next to it and look at the telescope. Telescope of William Parsons in Ireland The Telescope of Lord Rosse , print maker: Carel Christiaan Antony Last, ( - Album alb9395550 Some figures stand next to it and look at the telescope. Telescope of William Parsons in Ireland The Telescope of Lord Rosse , print maker: Carel Christiaan Antony Last, ( - Album alb9395550](https://www.album-online.com/photos/prev/ZmUxMGI3MA/album_alb9395550.jpg)
Some figures stand next to it and look at the telescope. Telescope of William Parsons in Ireland The Telescope of Lord Rosse , print maker: Carel Christiaan Antony Last, ( - Album alb9395550
![The Leviathan of Parsonstown, the 72 inch telescope built by William Parsons, 3rd Earl of Rosse, in 1845. It was located at Birr Castle, Parsonstown, County Offaly, Ireland and was the largest The Leviathan of Parsonstown, the 72 inch telescope built by William Parsons, 3rd Earl of Rosse, in 1845. It was located at Birr Castle, Parsonstown, County Offaly, Ireland and was the largest](https://c8.alamy.com/comp/2G6HB08/the-leviathan-of-parsonstown-the-72-inch-telescope-built-by-william-parsons-3rd-earl-of-rosse-in-1845-it-was-located-at-birr-castle-parsonstown-county-offaly-ireland-and-was-the-largest-telescope-built-in-the-19th-century-parsonstown-is-now-known-as-birr-the-telescope-can-still-be-seen-at-irelands-historic-science-centre-at-birr-castle-from-the-universe-or-the-infinitely-great-and-the-infinitely-little-published-1882-2G6HB08.jpg)