$Electron Diffraction Tube$

Code Number: 7B35.40

Demo Title: Maltese Cross Tube

Condition: Good

Principle: Electron Beams and Properties

Area of Study: Modern Astronomy

Equipment:

Maltese Cross Tube (Tel-Atomics), 5000 Volt power Supply (813 Tel-Atomic), Induction Coil, Old Maltese Cross Tube.

Procedure:

The Maltese Cross is fixed in the tube and cannot be moved, therefore it is just a matter of turning up the power supply until the tube glows at an acceptable level.

In the old Maltese Cross tube the cross can be folded down. This tube is normally run off of an induction coil. One polarity of the induction coil will show a Maltese Cross pattern in the electron beam and the other polarity will just show a light green glowing plasma.

References:

Freier & Anderson, "Ep-10: Maltese Cross," A Demonstration Handbook for Physics.

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

7B35.40 - Maltese Cross Tube

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