The Turn Of The Century Electrotherapy Museum
(C) Jeff Behary 2010 

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Villard or Ventril Tube
Many thanks to Alastair Wright for providing us with these photos
This is an early rectifying valve for induction coils to remove inverse current
from the discharge.  Think of it as an early diode!  Point - Plane rectification in a vacuum...


(C) Jeff Behary, 2010