2.2 Bi-Polar coils

"1/2 Wave Bipolar Tesla coils"

Bipolar Tesla coils are Tesla Coils have 2 discharge terminals. They are connected to each end of the secondary. Discharges eminate from one terminal to the other. The primary coil is placed in the center of the secondary coil. The secondary coil is 1/2 wavelength long. The discharges from each terminal are 180 out of phase, so the discharges attract each other. They do not necessarily require grounding, the secondary coil can be left to work against itself.