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Crookes, William (1832–1919)


William Crookes
English physicist who discovered the element thallium (1861), invented the radiometer (1875), and pioneered the study of cathode rays. By 1876 he had devised the Crookes tube, a glass tube containing two electrodes and pumped out to a very low gas pressure. By applying a high voltage across the electrodes and varying the pressure, he was able to produce and study cathode rays and various glow discharges.


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