Two photogaphic prints, showing the collision of an alpha-ray with an oxygen atom in an argon-filled expansion chamber (black-and-white print - photograph)
Black and white photographic print, showing the track of a cosmic ray passing through a lead plate 5 mm thick (black-and-white print - photograph)
Black and white photographic print, showing multiple showers in cosmic rays (black-and-white print - photograph; label)
Illustrative photogaphic print and diagram, showing the compound photo-electric effect in argon (black-and-white print - photograph; diagram)
Photogaphic print and diagram showing the compound photo-electric effect in krypton, produced by X-rays of 60 kV (diagram; black-and-white print - photograph)