File:Crookes tube diagram.svgDescriptionCrookes tube diagram.svg English: Diagram of Crookes tube, an experimental discharge tube invented by William Crookes around 1875. The power
File:Crookes tube2 diagram.svgDescriptionCrookes tube2 diagram.svg English: Schematic diagram of a Crookes tube. This was a cold cathode discharge tube invented by William Crookes and other