This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Crookes tube diagram.svg Schematic diagram of Crookes tube This was cold cathode discharge tube invented by William Crookes and other physicists around the in which cathode rays electrons were discovered It consisted of partially evacuated glass tube with two electrodes When high potential of several thousand volts is applied between