Barkla, Charles Glover (glŭˈvər bärˈklə) [key], 1877–1944, English physicist. He was professor of natural philosophy at Edinburgh from 1913. For his discovery of the characteristic X rays of elements he received the 1917 Nobel Prize in Physics. He evolved the laws of X-ray scattering and the laws governing the transmission of X rays through matter and excitation of secondary rays.
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