Photogaphic print and diagram, showing showing secondary beta-rays ejected from air and from a copper screen by X-rays
Diagram showing apparatus for formation of helium by the accumulation of alpha-particles emitted from emanation
Black and white photographic print, showing the production of a pair of electrons, positive and negative
Photogaphic print and diagram, showing secondary beta-ray ejected from copper by X-rays together with a secondary beta-ray due to copper K-radiation