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Professor Lenard's fundamental idea was to study the cathode rays under conditions different from those in which they are produced.
The phenomena produced both inside and outside a Crookes tube are, however, generally complex. In Lenard's first experiments, and in many others effected later when this region of physics was still very little known, a few confusions may be noticed even at the present day. At the spot where the cathode rays strike the walls of the tube the essentially different X rays appear.
Lenard's experiments certainly favour the hypothesis of their being waves in the luminiferous ether. Professor Rontgen, of Wirzburg, profiting by Lenard's results, accidentally discovered that the rays coming from a Crookes tube, through the glass itself, could photograph the bones in the living hand, coins inside a purse, and other objects covered up or hid in the dark.
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