Crookes tubes



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 Code Number :   7B35.10  

Disclaimer:

Reprinted by permission of Dick Berg, University of Maryland, for use on this website.

The demonstrations contained and referenced herein are listed for the purposes of cataloging and describing physics demonstrations which should be conducted only under the direction of a trained instructional support professional or physicist. These demonstrations are not presented for the purpose of being conducted by persons unconnected to this Facility and/or persons not consulting with or being supervised by the recognized instructional support professional or physicist and his/her staff. The University is responsible only for those demonstrations carried out using its own equipment using established safety and scheduling policies, and bears no responsibility for those choosing to use this source material for their own purposes. All demonstrations described and contained herein are public domain, and can also be found in reference materials in libraries, bookstores, and electronic sources.

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Condition :   Good  
Principle :   Electron Beams and Properties  
Area of Study :  Modern Astronomy   
Equipment :   Large Crookes Tubes (1 to 3 ft. long), Small Crookes Tubes (Light bulb and others), Vacuum Pump, Induction Coil.

  
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. The Crookes tubes are designed to be evacuated during the above operation so that different patterns and characteristics may be observed.  
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   References

Carl Fields,  "Radiation from Video Display Terminals?"  TPT, Vol. 25, # 4, p. 213, (April 1987).

 

Karl Parsons, "X-Ray Dosage from a Crookes' Tube", AJP, Vol. 35, # 9, Sept. 1967, p. 890.

 

Ep-7,9:  Freier and Anderson, A Demonstration Handbook for Physics.

 

S-150:  "Gas Discharge & Evacuated Tube,"  DICK and RAE Demo Notebook.

 

"Crookes Tubes: How Safe Are They," PIRA News, Vol. 3 # 1, January 1988.

William S. Properzio, Ray C. Woodcock, and Sidney D. Heidersdorf, "X-Ray Emission from Cold-Cathode Gas Discharge Tubes Used for Educational Purposes," X-ray Exposure Control Laboratory, Division of Electronic Products, Feb. 1970.

 



Mail Questions and Comments to:  Dale Stille