Charles Glover Barkla

Charles Glover Barkla was born on 7 June 1877 in Britain, entering physics just as invisible rays were remaking the field. His experiments with scattered X-rays revealed something unexpected: different elements produced characteristic radiation at distinct wavelengths, turning X-rays into a diagnostic tool for identifying atomic structure. The work earned him the Nobel Prize in Physics in 1917. He continued research through the interwar years, though his later ideas drew less consensus. He died on 23 October 1944, his signature discovery long since woven into the fabric of experimental science.