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Mar 31, 2024 · Sir William Crookes was a 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. After studying at the Royal College of Chemistry, London, Crookes became superintendent of the meteorological.
- The Editors of Encyclopaedia Britannica
He is credited with discovering the element thallium, announced in 1861, with the help of spectroscopy. He was also the first to describe the spectrum of terrestrial helium, in 1865. Crookes was the inventor of the Crookes radiometer but did not discern the true explanation of the phenomenon he detected.
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Jun 8, 2018 · 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.
His investigations with the element also led to his discovery of the principle upon which he built the Crookes radiometer, a device that produces rotary motion from light. This instrument was the predecessor of a number of more sensitive types of radiant energy detectors.
Sir William Crookes 1832-1919. Sir William Crookes, OM, FRS, is most noted for his discovery of thallium and his research in cathode rays. The IET Archives holds material relating to his work including a valuable collection of photographs and films.
A Crookes tube (also Crookes–Hittorf tube) is an early experimental electrical discharge tube, with partial vacuum, invented by English physicist William Crookes and others around 1869-1875, in which cathode rays, streams of electrons, were discovered.
The Discovery of the Electron (William Crookes) The definitive experiments with cathode-ray tubes were done by William Crookes in 1879. Crookes' major contribution was the development of a better vacuum pump that allowed him to produce cathode-ray tubes with a smaller residual gas pressure.
