The Turn Of The Century Electrotherapy Museum

 A New Form Of Induction Coil
I tried my hand at winding some more complex coils...and here is something simple.

Secondary Coil is 2.375" in diameter x 12" long.  800T of 29 AWG Magnet Wire
Primary Coil is Copper Ribbon, cut from Roof Flashing, .75" wide.  8 turns.
Core is built up to 1.5" from 1.5" wide x 13" long.

Sparks 1.5" long.

A crude test to see how it works for high frequency work.

Finished Coil

EPDM rubber spacers to center the core.
Pancake Coil