Re: Air plate cap

To: tesla-at-pupman-dot-com
Subject: Re: Air plate cap
From: Ed Phillips <evp-at-pacbell-dot-net> (by way of Terry Fritz <twf-at-verinet-dot-com>)
Date: Sat, 24 Apr 1999 23:12:35 -0600
Approved: twf-at-verinet-dot-com
Tesla List wrote:
> 
> Original Poster: Grayson B Dietrich <electrofire-at-juno-dot-com>
> 
> On Wed, 21 Apr 1999 11:50:43 -0600 Tesla List <tesla-at-pupman-dot-com> writes:
> >Original Poster: Michael Tucknott <Michael.Tucknott-at-virgin-dot-net>
> >
> >Grayson
> >You said about spacers in your plate cap.
> >I think if you can get some Nylon threaded rod ( M10 ) and nuts
> >you could vary the spaceing with the nuts and the insulatin properties
> >of the Nylon would be very good.
> >
> >Also by being able to move the plates in and out you should be able
> >to fine tune the cap value to the needs of the coil.
> >
> >Any thought on this???
> >
> >Cheers Mike Tucknott
> >*********************************************************************
> >If at first you don`t succeed......
> >
> >It must be someone else`s fault so
> >Find them; Blame them; Make them pay
> >
> >http://freespace.virgin-dot-net/michael.tucknott/tesla.html
> >*********************************************************************
> >
> Actually.. the cap wasn't mine-- the text was stolen from someone's web
> page, provided for the benefit of Chris Boden, I believe.
> I had given thought of using threaded nylon rod for a while back for an
> adjustable spark gap-- with the elements being movable much like the
> plates in the cap you envisioned. Wouldn't it be a shame, though, if a
> track were burned through the rod, and you had to re-set all those
> manymanymanymanymany washers? I think I'll stick to good old SW and
> poly-oil caps for now.
> 
> Buuutttt...  I'd want to take the adjustable cap a step further, and
> submerse it in oil...-- but now I'm treading on ancient ground, aren't I?
> 
> With silent lightning in my hands,
> -The Electrophile-
> Grayson Dietrich
> 
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	Marconi used air-insulated capacitors in some of his transmitters. 
There were pictures of those at his original Glace Bay transmitter site
on the net a year or so ago.  I believe the capacitance was of the order
of 1 ufd, and the capacitor occupied a rather large building.

Ed