| This fact should be borne in mind when we come to speak of the electrical region outside a Crookes tube. |
| This is all which appears to be accomplished by the process which Mr. Crookes recommends. |
| Fig. 220 shows a Crookes tube fitted with a metal plate, so that the cathode rays coming from C will strike it. |
| The electrical discharge in the Crookes tube is many-sided in its manifestations. |
| The use of the X rays is accompanied with some danger if the Crookes tube is not properly used. |
| Another illustration of the power of cooled charcoal to produce high vacua is afforded by a Crookes radiometer. |
