ive used these types of transformers many times

@PizzaPlatypus
more like a capacitor..... but still cool :D

Yeah, I use these a lot. You can also make one with two pixels of water between metal, because water takes time to "re-spark."

but the problem with the water capacitors is that they can overheat

Not bad.

I would say that in powder toy they should be considered resistors. Don't argue, its what it does OK!

And definitely brilliant, water resistors are bulky so its a big improvement.

@massey101

yes, i (and most likely others too) have thought of an idea of a timer element that the hotter it is, the longer it takes for it to accept and pass on another spark after the previous one. This would cut down on size for delay timers and would be a pretty good addition along with a resistor element that accepts sparks at the same rate, just the speed at which they travel decreases as the temperature increases.