Re: Rotary Spark Gap.

From: 	D.C. Cox[SMTP:DR.RESONANCE-at-next-wave-dot-net]
Sent: 	Thursday, December 04, 1997 1:50 AM
To: 	Tesla List
Subject: 	Re: Rotary Spark Gap.

to: Joshua

Don't use plexiglass for the rotor material.  The high temps can heat up
the plastic and release your rotating electrodes.  Better choice of
materials is type LE or CE phenolic.  1/2 inch thick x 11 in dia running on
a standard 1/3 HP 1725 motor works fine.  Use approx 10 rotating electrodes
and 4 fixed electrodes (4 total gaps) with two fixed electrodes on each
side of the motor.  Tungsten/molydenum alloys work best -- if you are on a
tight budget you can use stainless steel but the fumes are toxic so a well
ventilated area is a requirement.


> From: Tesla List <tesla-at-pupman-dot-com>
> To: 'Tesla List' <tesla-at-poodle.pupman-dot-com>
> Subject: Rotary Spark Gap.
> Date: Tuesday, December 02, 1997 10:39 PM
> From: 	Joshua Resnick[SMTP:seraphim-at-WPI.EDU]
> Sent: 	Tuesday, December 02, 1997 1:50 AM
> To: 	Tesla List
> Subject: 	Rotary Spark Gap.
> TC list,
> I just got a 1' dia  1/2" thick Plexiglas plate and a 1/3 hp -at- 3000 rpm
> motor  (4.7 amps) for my rotary spark gap.
> I have seen pictures of gaps with a metal ring configuration so that one
> electrode on each side (1 foot away) of the
> disk makes up the gap,  and ones with electrodes that go through
> straight through disk.  Which method, if any, is best?
> Also what formula should I use to estimate the relationship between
> capacitor size and gap frequency?
> Does anybody know of a good piece of hardware suitable for electrode
> use?
> Thanks alot,
> Joshua Resnick