Black and white photographic print showing a shower of over 100 particles, taken on Pike's Peak (black-and-white print - photograph; stereograph)
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 (black-and-white print - photograph; stereograph)
Black and white photographic print showing a cosmic ray negative electron of 1300 million volts energy (black-and-white print - photograph)
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 (black-and-white print - photograph; stereograph)
