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Cathode Ray Tube

Crooke's tube and power supply


  • Crookes tube, with fluorescent screen
  • Induction coil
  • Powerstat power supply
  • Hook-up wires: one red alligator-alligator, one black alligator-alligator
  • Magnet


  1. Connect induction coil to Powerstat.
  2. Connect hook-up wires from induction coil to Crookes tube.
  3. Turn up power on variac until you can see a clearly defined line across screen.
  4. Without touching the Crooke's tube bring the magnet up so that the rays are bent

powered Crooke's tuberay inside the tube being bend with a magnet