The Crookes tube is in principle an Edison lamp with the filament broken.
Fig. 220 shows a Crookes tube fitted with a metal plate, so that the cathode rays coming from C will strike it.
Physicists did not take long to discover that the radiation from radium was very like the radiation in a "Crookes tube."
The Crookes tube became one of the toys of science—and the lamp of other investigators.
Both in the case of the Crookes tube and the aurora these streamers are produced by electrical discharges through rarefied air.
Thus the Crookes tube is active while the shutter is open but inactive while it is closed.
This fact should be borne in mind when we come to speak of the electrical region outside a Crookes tube.
The current that produces the X rays is led into the Crookes tube by wires.
The films are put in the mouth, and the Crookes tube placed outside in such a position that the rays can pass through the jaw.
Finally, in a tube exhausted as highly as possible, he obtained a faint fluorescent glow, like that produced in a Crookes tube.