Thanks for sharing Doug. One question to the group...as I am building my new toroid, I was under the impression that a smooth surface like I saw with Doug's machined toroid would provide only 1-2 sparks but I saw many like I get on my aluminum ducting toroid. Is this the case also with machined toroids? Tim On Thu, Apr 9, 2015 at 9:04 AM, Doug <doug11642@xxxxxxxxxxx> wrote: > Working great; https://www.youtube.com/watch?v=4LTzJAashpQ > Doug Johnson > _______________________________________________ > Tesla mailing list > Tesla@xxxxxxxxxx > http://www.pupman.com/mailman/listinfo/tesla > _______________________________________________ Tesla mailing list Tesla@xxxxxxxxxx http://www.pupman.com/mailman/listinfo/tesla