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

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Shock Coil, High Tension Rhumkorff Coil

With no condenser produces horrible shocks.  With 1 mfd condenser produces small sparks and very painful shocks.
With 13 mfd condenser can power a small Tesla Coil when ran from 110V solid state circuit (bypassing interrupter).
2 layers of wire for primary, 136 turns.  11 layers for secondary coil, 3200 turns 34 AWG.
(C) Jeff Behary, 2011