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Re: 2 foot sparks
From: Peter Electric[SMTP:elekessy-at-macquarie.matra-dot-com.au]
Reply To: elekessy-at-macquarie.matra-dot-com.au
Sent: Friday, July 25, 1997 6:21 AM
To: Tesla List
Subject: Re: 2 foot sparks
Tesla List wrote:
>
> From: Alan Sharp[SMTP:100624.504-at-CompuServe.COM]
> Sent: Wednesday, July 23, 1997 6:56 PM
> To: INTERNET:tesla-at-pupman-dot-com
> Subject: Re: 2 foot sparks - need more garage!
>
> John,
>
> >Your spark gaps are probably quickly overheating after you turn on
> >the system, the quench is degrading and output sparks weaken.
> >You can try using some sort of fan or air blast to cool the gaps, or
> >use a greater number of gaps...if you haven't already tried this.
> >John Freau
>
> Yes, I'm using 5 pieces, 3" long, of 2" diameter copper pipe
> set very close as a spark gap. I tried a fan as you suggested
> and it helps. I'm looking for an old hairdryer or a vacume
> cleaner for an air blast.
>
> Next I'm going to rebuild to make it more portable and try
> building some capacitors. Probably using tin foil, stuck
> with varnish to 2mm clear polystyrene. This should hold at
> 7500V AC even without oil - I hope!
>
> But I think its quite big enough! I don't really have the
> room at home for a bigger coil.
>
> Then I think I'll go back to solid state coils - more manageable.
> Later I'll try a valve coil - then I'll really need your help, John.
>
> Someone was asking about my transformer - sorry but it was a one off
> surplus from a physics dept, no more caps either.
>
> Have fun,
>
> Alan Sharp (UK)
Yes, I was asking about the tranny, shame about that as they are not so
easy to come by here in Aus either.
I have a tip for you re quenching of the spark gap. I found that two
squirel cage fans from old microwave ovens work a treat. You place one
blowing forward towards your gap and and place the other one sucking at
the back (if you know what I mean). I used 6" plumbing pipe to house the
gap and hot melt glue makes it really easy to mount the fans.
I found this works just as well as quenching using a compressor at 20psi
with out the big hassle of running the compressor.
Cheers,
Peter E.