Re: Spark gap spheres

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Dave" <dgoodfellow@xxxxxxxxxxxxxx>

For spark gaps I like to use brass pull chain balls as found in the 
ceiling fan department. The balls have a 1/4 inch hole in one side, 
and at the opposite end of that hole is a smaller hole which is the 
right size to run an 8-32 tap. The larger hole on the one end makes 
for a better spark gap than a round ball. I tried to use 1 inch round 
brass balls on a gap one time, and the performance was miserable. It 
is important to use flat surfaces for spark gaps.

Dave Goodfellow

----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Thursday, August 17, 2006 9:21 PM
Subject: RE: Spark gap spheres


> Original poster: "Rich & DJ" <rdj@xxxxxxxxxxxx>
>
> I got mine at Home Depot in the lamp area , where they have the 3/8 27
> rod and the switches and lamp parts.
>
> Rich, from the middle of Missouri
>
> -----Original Message-----
> From: Tesla list [mailto:tesla@xxxxxxxxxx]
> Sent: Thursday, August 17, 2006 5:59 PM
> To: tesla@xxxxxxxxxx
> Subject: Spark gap spheres
>
> Original poster: "Jonathan Peakall" <jpeakall@xxxxxxxxxxxx>
>
> Hi All,
>
> I know this has been discussed before, but I don't seem to be able to
> find
> the posts. Anyway, I need some brass or copper spheres, blind tapped
> with
> 4/40 or 6/32 thread, 3/8" in diameter. I know someone on the list posted
> a
> link for reasonably priced ones. Anyone got that link handy? US$5 is the
> cheapest I have found so far, and I need 20 or so.
>
> Thanks
>
> Jonathan
> www.madlabs.info