The Turn Of The Century Electrotherapy Museum
Quadpolar Tesla Coil Tests
4 Pancake Coils - 48" long!
2 Bipolar Coils - primaries in antiparellel.
1st and 4th coils have same polarity; 2nd and 2rd coils have same polarity.
2nd and 3rd coils grounded. 2nd and 3rd innermost secondaries connected
Tripolar Tesla Coil - 1st and 3rd Coils have the same polarity, middle coil has the opposing pole.
On taking a discharge from either pole to the centre, the end pole of the same polarity bursts into a brush discharge.
(C) Jeff Behary, 2008