Crookes William

Crookes

 (kro͝oks), Sir William 1832-1919.
British chemist and physicist who discovered thallium (1861), invented the radiometer (1875), and studied cathode rays.

Crookes

(kro͝oks), Sir William 1832-1919.
British chemist and physicist who discovered thallium in 1861 and invented the radiometer in 1875. He also investigated cathode rays, demonstrating that they consisted of charged particles.