The Turn Of The Century Electrotherapy Museum

2008 Coils:  Some old concepts with new twists

Tesla / Oudin Secondary Coil with variable pitch threads.

Coil is 140 turns of 30 SSC wire, spaced from 14 to 4 TPI over 14" in length of 4.5" OD

Mejla guarding the latest coil forms:

Inspired by Thomas Stanley Curtis

Close-wound coil vs. space-wound coil.

(C) Jeff Behary, 2007, 2008