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

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Testing Ritchie Induction Coil Interrupter

Just under 1/4", 36 tpi.  The other screws are .195" OD and 30 TIP!

5-6" sparks without pusing !

This same coil produced a 3.75" spark from a singe AA battery!!

(C) Jeff Behary, 2011