Definition of Crookes, Sir William in English:

Crookes, Sir William

proper noun

  • (1832–1919), English physicist and chemist. In 1861 he discovered the element thallium. This led him indirectly to the invention of the radiometer in 1875. He later developed a vacuum tube (the precursor of the X-ray tube) and in 1903 invented the spinthariscope.


Crookes, Sir William