Black and white photographic print showing a shower of over 100 particles, taken on Pike's Peak Nuclear Physics 1935-1937
Black and white photographic print showing a cosmic ray negative electron of 1300 million volts energy Nuclear Physics 1935-1937
Black and white photographic print showing a shower of three negative electrons and three positrons Nuclear Physics 1935-1937
Black and white photographic print showing individual ions of three cosmic ray tracks (early' tracks) Nuclear Physics 1935-1937
Black and white photographic print showing a disintegration produced in a lead plate by cosmic rays. One of the particles ionises heavily, taken on Pike's Peak Nuclear Physics 1935-1937
Black and white photographic print showing the passage of a positron through a 0.35 cm. lead plate, with the production of two further tracks below the plate, taken on Pike's Peak Nuclear Physics 1935-1937
