[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
RE: SW cap - another question
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>
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?
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Sunday, September 30, 2001 9:07 AM
Subject: Re: SW cap
Original poster: "Gregory Hunter by way of Terry Fritz <twftesla-at-qwest-dot-net>"
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.
--- 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
> 1) What is the capacitnce (not exact of course, i
> mean is it 1nF, 10nF,
> 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,
Do You Yahoo!?
Listen to your Yahoo! Mail messages from any phone.