A Third Generation?

Generation II

The Gen II coil evolved in the 1980s and is now the dominant fashion among the cognoscenti of Tesla-coiling who keep up with the Tesla Coil Builders Association News. Championed in that publication, especially by the amazing Tesla Coil Builders of Richmond, Virginia, this evolution retains the traditional single-layer helical secondary, but now there is a greater appreciation of the larger diameter secondary in proportion to length. The primary is likely to be a flat spiral but may be a Gen I helical or cone-like, expanding outward as it rises.

A loose coupling between primary and secondary is appreciated more than ever, and, if it can be mechanically devised, the separation between primary and secondary is changeable, a variable coupling. The argument for loose coupling is not just that it provides insurance against arcing