Search results
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.
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.
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
Crookes was very innovative in his investigations with vacuum tubes and designed a variety of different types to be used in his experimental work. One of the most famous is the Maltese cross Crookes tube, which he used to demonstrate that cathode rays travel in straight lines.
Crookes also contributed to the advancement of our know-ledge of radio-activity. He showed that this was only notice-ably exhibited by uranium or thorium minerals, and he made the " spinthariscope," which enabled the bombardment of the alpha-particles emitted by radium to be observed upon a zinc sulphide screen. Crookes also proved that ...
Jun 17, 2022 · On June 17, 1832, British physicist, chemist, science journalist, and parapsychologist Sir William Crookes was born. Crookes visualized cathode rays, discovered the fundamentals of luminescence and isotopes, and developed methods for detecting ionizing radiation.
Jan 5, 2009 · In a 1976 paper, Robert DeKosky wrote ‘William Crookes is a puzzle to historians of latenineteenth century science. Despite his achievements we are forced to ask why he did not accomplish more.’.
