The Turn Of The Century Electrotherapy Museum http://www.electrotherapymuseum.com 2008 Coils:  Introducing some of the "Twelve Tesla Coils Of January 2008"... Two Oudin Coils, 28 DSC Wire Bipolar Brush Discharges - Short spark gap Testing phases, .004 - .006 mfd doorknob caps With more capacity, the discharges appear more defined. The sparks are white, yet cold in nature. With less capacity, the discharge becomes warmer and the sparks less defined. Testing phase, .004 mfd, 5kV 120mA Testing a taller Oudin Coil, 12" discharges Unstained base made from plywood and rosettes Finished base with Primary Winding Closeup of coil winding.  I love the silk covered wire! Primary made from 1/4" copper tubing.  Damn copper got expensive with the war effort, almost unaffordable! Quadpolar Tesla Coil, Four Pancake Coil Prototype Top view of same, showing secondary coils - first stage of impregnation. The massive case is 12" wide x 48" long! (Doesn't sound big till its filled with wax and you're trying to move it!) Stained feet of larger cases The next project will be a bipolar coil with two different frequency secondaries One will be close-wound... The other will be space wound... Nation is a professional wire-stripper and un-coiler Mejla also helps to uncoil perfectly wound secondary coils... They often argue about how much of the wire to remove from the forms! (C) Jeff Behary, 2008