The Turn Of The Century Electrotherapy Museum
(C) Jeff Behary 2011 

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Triboluminescent Geissler Tube Rotator...
By rotating the Geissler tubes (made by Lutz Neumann) slowly, 20-30 RPM, the friction of the mercury causes
the neon gas inside to glow.  Its a very dim but interesting hand-powered lamp.

(C) Jeff Behary , 2012