Black and white photographic print showing the passage of a positron through a 0.35 cm. lead plate (black-and-white print - photograph; stereograph)
Black and white photographic print showing a shower of three negative electrons and three positrons (black-and-white print - photograph; stereograph)
Photograph showing a cosmic ray positron of 900 million volts energy (black-and-white print - photograph)
Black and white photographic print showing individual ions of three cosmic ray tracks (early' tracks) (black-and-white print - photograph)
Black and white photographic print showing a disintegration produced in a lead plate by cosmic rays (black-and-white print - photograph; stereograph)
