![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
![The Forty-Foot Telescope at Slough. Photographed by Sir John F.W. Herschel photographed 9 September 1839; this print made in August 1890 | Sir John Frederick William HERSCHEL The Forty-Foot Telescope at Slough. Photographed by Sir John F.W. Herschel photographed 9 September 1839; this print made in August 1890 | Sir John Frederick William HERSCHEL](https://www.jonathanahill.com/pictures/6384.jpg?v=1541600749)
The Forty-Foot Telescope at Slough. Photographed by Sir John F.W. Herschel photographed 9 September 1839; this print made in August 1890 | Sir John Frederick William HERSCHEL
![In the hands of William Herschel, the telescope became a powerful scientific tool. Herschel had a talent for telescope making that matched his passion for studying the heavens. He began building them In the hands of William Herschel, the telescope became a powerful scientific tool. Herschel had a talent for telescope making that matched his passion for studying the heavens. He began building them](https://c8.alamy.com/comp/G15F84/in-the-hands-of-william-herschel-the-telescope-became-a-powerful-scientific-G15F84.jpg)