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 >>/28898/
I've seen and heard plenty of this, but those are tesla coils which are tuned resonant transformers. I've seen some devices which include those, like the pic. I found a proper testla coil to be a bit tricky to make because it has to be tuned ro resonance frequency.

 >>/28899/
I don't know, I haven't read far into the reasons, I'm mainly interested in the tech

Here's further reading on the Hans Coler device in case anyone's interested;
http://rexresearch.com/coler/colerb.htm