[Techman]

Well I suppose it had to be done.

I've got period accumulators, but I'm not filling them with acid at this point in time, so I got a car battery and a hefty ballast resistor to limit the current and we had high voltage sparks. They were running a bit over voltage and the larger induction coil should really be capable of performing better, but at some point in its life it's been left connected to a supply with its contact breaker in the fully closed position, causing overheating and quite a lot of wax has run out, as can maybe be seen. The smaller coil isn't encased in wax.

Photos below show the spark discharge from both coils, which is continuous. Shown in a darkened room, and also with curtains opened to show the setup.