deaths
April 4, 1919
William Crookes, English chemist and physicist (born 1832)
William Crookes
Sir William Crookes was an English chemist and physicist who attended the Royal College of Chemistry, now part of Imperial College London, and worked on spectroscopy. He was a pioneer of vacuum tubes, inventing the Crookes tube, which was made in 1875. This was a foundational discovery that eventually changed the whole of chemistry and physics.