RE: SW cap - another question

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Johnson, Jeffrey D -at- PWC by way of Terry Fritz <twftesla-at-qwest-dot-net>" <jeffrey.d.johnson-at-l-3com-dot-com>

Coilmeisters,
On the topic of SW caps, what about using a plastic bottle made of PETE or
HDPE?  I realize PETE is very high loss (.010) but has 4kV/mil dielectric
strength meaning you could use the small thickness of a plastic bottle
(maybe?).  HDPE has much lower loss (<.0002) and 1.2kV/mil.  All the soda
bottles I've seen are PETE.  They also have a corrugated bottom which I
don't know how to deal with.  Any thoughts?
thanx,

JJ

-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Sunday, September 30, 2001 9:07 AM
To: tesla-at-pupman-dot-com
Subject: Re: SW cap


Original poster: "Gregory Hunter by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<ghunter31014-at-yahoo-dot-com>

Hi Jason,

Wine bottles are not very uniform. Lotsa variation
from brand to brand. I've measured a few. 1.2 to 1.7nF
is a good guestimate.

Greg
http://hot-streamer-dot-com/greg

--- Tesla list <tesla-at-pupman-dot-com> wrote:
> Original poster: "Jason by way of Terry Fritz
> <twftesla-at-qwest-dot-net>" <jasonp-at-btinternet-dot-com>
> 
> Hi all,
> 
> I have just constructed an SW cap. It is basically a
> wine bottle filled with
> concentrated salt water. It has a copper wire going
> down the middle of it,
> and the tinfoil is connected around the whole of the
> cylindrical part of the
> bottle. It is then filled up to the neck with motor
> oil, and stopped with a
> rubber wine cork. I was wondering a number of
> things:
> 
> 1) What is the capacitnce (not exact of course, i
> mean is it 1nF, 10nF,
> what?)
> 2) Why does it hiss when connected to a neon (sounds
> like air ionising)
> 3) What are the dielectic properies of glass?
> 4) Does the salt water just act as a conductor
> rather than part of the
> actual capacitor? I have access to purified mercury
> - what would this be
> like instead of salt?
> 
> Thanks all,
> 
> Jason
> 
> 
> 


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