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