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I have a number of large Leyden jars with my machine - they can be quite dangerous if left around when fully charged! And surely you mean 4 inches of spark and not 4 foot
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Would love to see your machine if you manage to dig it out.
You are right. it is 4"
. My Van der Graaf produces very weak spark. It prefers a "blow dry" with a hair drier after storage.
I used to be a high voltage junkie that now leaves my living quarter like a mad scientist lab. In the photo below, it is my small collection of DIY tesla coils: the big Tesla coil can produces 1.45 m spark. The small ones include a musical DRSST using IGBT and a half bridge solid state tesla coil with mosfets.