Black and white photographic print, showing a nuclear explosion due to cosmic rays, yielding three highly-ionising particles together with an electron 1936
Black and white photographic print, from a negative by Pierre Auger, Paris, France, showing a compound photo-electric effect in neon 1933-1937
Black and white photographic print, showing the track of a cosmic ray passing through a lead plate 5 mm thick 1933-1937
Black and white photographic print, showing the track of a proton projected by a neutron from beryllium bombarded by alpha-rays from polonium, in a magnetic field of 8000 gauss 1933-1937
Black and white photographic print, showing a long range alpha-particle of range 9.5 cm from thorium C and C1 1933-1937