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["David Dean" <deano-at-corridor-dot-net> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)]

Hi Bert,

It looks like you win the prize. Though some of the weird looking stuff in
the pictures can be written off as reflections, not that. And yes, there is
some autotransformer stuff going on in the primary, including turn to turn
flashovers and D"Arsonval type discharges from the outer turn to the tap
conductor coming from the sparkgap when the tuning is just a bit off the
sweet spot.

After the pictures were made, and I had changed to a larger cap, the
phenomena became more pronounced, no one to take pictures of it then,
though.

So you suggest increasing the distance between the primary coil and the
sparkgap. This brings me to my next question.

How far do most folks run their sparkgaps from their coils?
And on the same note, how far away would be to far?

later
deano



>
> Deano,
>
> It's hard to tell from the pictures, but if it's not a spurious
> reflection from the gap then I'd guess you're seeing a combination of
> autotransformer action between the tap point and the outermost turns of
> the primary combined with insufficient clearance between the outermost
> turn and your rotary spark gap.
>
> Try increasing the distance between the gap and the outermost turn of
> the primary.
>
> -- Bert --
> --
> Bert Hickman
> Stoneridge Engineering
> Email:    bert.hickman-at-aquila-dot-com
> Web Site: http://www.teslamania-dot-com
>
>
>
>