Sir William Crookes (1832-1919), English chemist and physicist, 1926. Artist: Unknown
Sir William Crookes (1832-1919), English chemist and physicist, 1926. In 1861, Crookes discovered a previously unknown element with a bright green emission line in its spectrum and named the element thallium. In 1895 he identified the first known sample of helium. He also invented the Crookes radiometer. From An Outline of Christianity, The Story of Our Civilisation, volume 4: Christianity and Modern Thought, edited by RG Parsons and AS Peake, published by the Waverley Book Club (London, 1926).
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