I got a 15kV 30ma neon sign transformer a while ago, and have made a nice little jacobs ladder in a perspex box. Since i was bored tonight, I got some pics and a vid. I like the pictures
In real life, its just a single arc going up, but for some reason the camera captured a few, giving the wall effect. You can also see the 50hz cycling in the last pic
This pic shows 2 arcs, the one up the top didnt finish before the lower one struck.
And a vid : http://au.youtube.com/watch?v=1_8oD8UyZ7c
EDIT: No [media] tags?