Francis William Aston — British Scientist born on September 01, 1877, died on November 20, 1945
Francis William Aston FRS was a British chemist and physicist who won the 1922 Nobel Prize in Chemistry for his discovery, by means of his mass spectrograph, of isotopes, in a large number of non-radioactive elements, and for his enunciation of the whole number rule. He was a fellow of the Royal Society and Fellow of Trinity College, Cambridge... (wikipedia)