A British Chemist/ Physicists
Born on June 17, 1832, and died on April 4,1919 in London, England. He went to college at the Royal College of Chemistry in London. He was the eldest son of Joseph Crookes, who was a tailor of north-country origin. His second wife was Mary Scott. William received some instruction at a grammar school at Chippenham, Wiltshire. But his scientific career began when, at the age of fifteen, he went to the Royal College of Chemistry in Hanover Square, London
He was known mostly for his discovery of the element Thallium. He also discovered the principle of the Crookes radiometer, a device that converts light radiation into rotary motion. The principle of this radiometer has found numerous applications in the development of sensitive measuring instruments.