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  1. Oxford Dictionary

    Crookes, Sir William

    • IPA[krʊks]

    英式

    • ph.
      (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.