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Re: [TCML] Top load "sparkles" question



Local breakdown of the coating?

Ed

Paul B. Thompson wrote:

I bought an assortment of objects to try as top loads on my small, tabletop coils. One is a oblate doorknob. It looks like brushed stainless steel, but it might be brushed aluminum. The knob does not stick to a magnet. It seems to have a heavy coat of clear coat. typical for a closet door knob.

In place, it emits the usual sort of long, tendril-like streamers. So far, so good. Then I noticed small sparkles popping up on the knob surface while the coil operates. These are little, bright white pinpoints of light that pop up, sparkle a very short time, then vanish. They reappear all over the surface of the doorknob. They're quite different from the streamers, which are long, lavender or purplish, and moving. I thought the sparkles might be where a streamer was trying to get through the clear coat and failing, but examining the knob with a magnifying glass I can't find any perforations in the clear coat that match where the sparkles appear.

What could these be? I am using a spark gap type coil, powered by a 7.5 KV NST, my own design dry Leyden jars (2 nF), with the lower end of the secondary joined to the lower end of a helical primary, etc.

PBT
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