>>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