Eddington, verification of bending of light as predicted by general theory of relativity
Mass spectrograph, Aston
22 September 1919 discovery of 2623 Zech and 2637 Bobrovnikoff
25 August 1919 Death of Viktor Carl Knorre in Lichterfelde, Sachsen-Anhalt , Germany
1919 Birth of (Emmeline) Jean Hanson
1919 Birth of Sir Godfrey Newbold Hounsfield
1919 Death of Wallace Clement Sabine
1919 Death of Michel Tswett (or Tsvet)
1919 Birth of Mathew Sands
1919 Birth of W. K. H. Panofsky
Physics to JOHANNES STARK for his discovery of the Doppler effect in canal rays and the splitting of spectral lines in electric fields.
Physiology or Medicine to Jules Bordet "for his discoveries relating to immunity"