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.

Disclaimer

These demonstrations are provided only for illustrative use by persons affiliated with The University of Iowa and only under the direction of a trained instructor or physicist. The University of Iowa is not responsible for demonstrations performed by those using their own equipment or who choose to use this reference material for their own purpose. The demonstrations included here are within the public domain and can be found in materials contained in libraries, bookstores, and through electronic sources. Performing all or any portion of any of these demonstrations, with or without revisions not depicted here entails inherent risks. These risks include, without limitation, bodily injury (and possibly death), including risks to health that may be temporary or permanent and that may exacerbate a pre-existing medical condition; and property loss or damage. Anyone performing any part of these demonstrations, even with revisions, knowingly and voluntarily assumes all risks associated with them.

Instructional Resources and Lecture Demonstrations

7B35.50 - Paddle Wheel Tube

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