crookes, sir william

Science Dictionary
Crookes   (krks)  Pronunciation Key 
British chemist and physicist who discovered thallium in 1861 and invented the radiometer (1873-76). He also developed the Crookes tube, a modified vacuum tube that was later used by W.C. Roentgen and J.J. Thomson in experiments that led to the discovery of x-rays and the electron, respectively.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica
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crookes, sir william

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.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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