John Freau wrote: > > Who measured this 3.5mv voltage again!!! > > >Richard Hull, TCBOR > > > Considering the growing of sparks due to ion cloud effects, I (ballpark) > estimate no more than 600 kV (maybe less) for a 15 foot Tesla coil spark. > > John Freau That sounds like a reasonable estimate, perhaps even 20 feet with 600 kV. -GL