They were discovered by Rntgen in the course of his researches with cathode rays.
A concise and complete account of the properties of the cathode rays.
The power to emit light on heating may be retained for months after the exposure to cathode rays.
Fluorescence is most efficiently excited by the cathode rays of a vacuum tube.
The spectrum of the salts under excitation of cathode rays is a short continuous one in the blue region.
Diamonds, rubies and many minerals fluoresce brilliantly in the path of cathode rays.
Fig. 220 shows a Crookes tube fitted with a metal plate, so that the cathode rays coming from C will strike it.
These rays are invisible and are even given out where the cathode rays strike the glass.
With his magnet the scientist throws a rope around the cathode rays and drags them whithersoever he will.
This last fact was sufficient of itself to prevent their confusion with the radiant matter “cathode rays” of the tube.