[kroo
ks] 
| Sir William, 1832–1919, English chemist and physicist: discovered the element thallium and the cathode ray. |
Crookes (kr ks) Pronunciation Key
British chemist and physicist who discovered thallium in 1861 and invented the radiometer (1873-76). He also developed the Crookes tube, a modified vacuum tube that was later used by W.C. Roentgen and J.J. Thomson in experiments that led to the discovery of x-rays and the electron, respectively. |