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Sir William Crookes, (born June 17, 1832, London, Eng.—died April 4, 1919, London), British chemist and physicist noted for his discovery of the element thallium and for his cathode-ray studies, fundamental in the development of atomic physics.

The English chemist and physicist Sir William Crookes (1832-1919) discovered the element thallium and invented the radiometer, the spinthariscope, and the Crookes tube. William Crookes was born in London on June 17, 1832.

William Crookes is recognised today as one of the great scientists of the Victorian era. He left his mark above all with his invention of the cathode ray tube and the discovery of a chemical element, thallium. But he was also the inventor of modern sunglasses (with a 100% ultraviolet filter) and ingenious devices to see the disintegration of ...

English scientist William Crookes was very innovative in his investigations with vacuum tubes and designed a variety of different types to be used in his experimental work. William Crookes was born in London, England, on June 17, 1832, the son of Joseph Crookes and his second wife, Mary Scott.

Sir William Crookes OM FRS ( / krʊks /; 17 June 1832 – 4 April 1919) was a British chemist and physicist who attended the Royal College of Chemistry, now part of Imperial College London, and worked on spectroscopy. He was a pioneer of vacuum tubes, inventing the Crookes tube which was made in 1875. This was a foundational discovery that ...