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Crook_Tubes-general

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ID = 69505
       
 
   
Tube type:  Geissler Crookes Elster-Geitel Hittorf 
Identical to Crook_Tubes-general

Filament
Description

Wikipedia

"Crookes tubes evolved from the earlier Geissler tubes, experimental tubes which are similar to modern neon tube lights. Geissler tubes had only a low vacuum, around 10−3 atm (100 Pa),[6] and the electrons in them could only travel a short distance before hitting a gas molecule. So the current of electrons moved in a slow diffusion process, constantly colliding with gas molecules, never gaining much energy. These tubes did not create beams of cathode rays, only a colorful glow discharge that filled the tube as the electrons struck the gas molecules and excited them, producing light."

See other pages for 1879: "Crookes put a tiny vaned turbine or paddlewheel in the path of the cathode rays, and found that it rotated when the rays hit it. The paddlewheel turned in a direction away from the cathode side of the tube, suggesting that the rays were coming from the cathode.

 
 
geissler_roehren_6_auf_brett.jpg
Crook_Tubes-general: Sammlung EE
Ernst Erb

 


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