Sir+William+Crookes+A3

====Sir William Crookes was a British physicist who discovered the Crookes tube, or Cathode tube.==== ====A cathode ray is comprised of a stream of electrons observed in vacuum tubes (Cathode tube) lowering the pressure to below 10-6 atm. As air is pumped out of the tube, dark space gradually spread through the length of the tube (from cathodes) until at the end (anode end) the cathodes reflect of the glass.====