Induction Coil
Fluorescent Spots
Paddle Wheel Tube

 

Code Number: 7B35.50

Demo Title: Paddle Wheel Tube

Condition: Good

Principle: Electron Beams and Properties

Area of Study: Modern Astronomy

Equipment: 

Induction Coil, Paddle Wheel Tube.

Procedure:

Hook the induction coil to the electrodes of the tube, turn on and adjust the power and the direction of the current of the coil.  Changing the direction of the current in the induction coil will change the direction that the paddle will move.  The older of the two tubes has very nice fluorescent spots that appear on the paddle wheel when running.

References:

  • T. E. Humphrey, Vaishnavi Calisa, "A Century-Old Question: Does a Crookes Paddle Wheel Cathode Ray Rube Demonstrate that Electrons Carry Momentum?", TPT, Vol. 52, # 3, March 2014, p. 142.