the needles are at a slight angle in relation to each other in that they get further apart the further you get from the cork
you then connect a very high voltage to them at the cork end.
it then arcs at the bottom, this arc then rises up the needles untill it gets to the top where its too great a distance to arc.
it then starts again.
it was an effect used in old frakenstein type movies as a background gadget
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