Re: Not shooting for anything gloriuous, but... (fwd)

To: tesla-at-pupman-dot-com
Subject: Re: Not shooting for anything gloriuous, but... (fwd)
From: Alex Crow <user-at-alexcrow.clara-dot-net> (by way of Terry Fritz <twf-at-verinet-dot-com>)
Date: Sat, 17 Apr 1999 07:46:55 -0600
Approved: twf-at-verinet-dot-com

Bob

Wrapping extra dielectric around the jar will *decrease* the capacitance
although it will increase the breakdown voltage. The thicker the dielectric,
the lower the capacitance - think of putting caps in series, which is
equivalent to greater PE thickness. Increasing the *surface area* of plates
and dielectric will increase the capacitance.

Alex Crow


Tesla List wrote:

> Original Poster: Tesla List <mod1-at-pupman-dot-com>
>
> ---------- Forwarded message ----------
> Date: Fri, 16 Apr 1999 07:14:15 -0700
> From: Robert Volk <smrtmny2-at-earthlink-dot-net>
> To: Tesla List <tesla-at-pupman-dot-com>
> Subject: Re: Not shooting for anything gloriuous, but... (fwd)
>
> When I was using glass caps, I blew 4 of them in one night. I wanted
> something quick so I could demonstrate my coil next day. I used a one
> gallon glass jar, that helped. But I wanted more capacitance. I put a
> one liter coke bottle in parallel with the rest and it punctured in a
> few seconds with oil and water running all over.
>
> My question to you more experienced coilers:
>
> Wouldn't it be possible to take a glass jar or LDPE plastic bottle, and
> wrap it with multi-layers of say .003 mil or .006 mil poly on the
> outside to increase the given capacitance AND help cut down the high
> voltage breakthrough as well? Seems like this is a cheap and quick
> solution to "glass cappers". The foil could then be tightly wrapped
> around the poly layers in the traditional way.
>
> It seems an easy solution. In the same way multi-layers prevent
> breakthrough with our rolled poly caps, they could do the same here.
>
> Anyone tried this before? Comments?
>
> Sparkin'
> Bob Volk
>
> > A better way to make a Leyden Jar capacitor is to use salt water on the
> > outside as well as the inside of the bottles.  It tends to eliminate
> > corona losses, and if a bottle breaks, the salt water is contained by
> > the outside container.  It does make a series string more difficult
> > (outside containers must be separated and insulated) and may exacerbate
> > the shock hazard . . .
> >
> > Corona will create ozone and ultraviolet light, both can cause the
> > plastics to weaken.