Re: Bottle Capacitor Questions

to: Albert

Most glass has a dielectric constant around 7.1 to 7.3 range.  Due to the
many shapes in some bottles it is easiest to just measure it with a digital
cap meter.   Most local TV repair shops in your area (the large shops) will
have one and could do it for you.

Glass is a horrible of insulation for a cap running at RF frequencies.  The
glass will overheat and usually cracks.



-----Original Message-----
From: Tesla List <tesla-at-pupman-dot-com>
To: tesla-at-pupman-dot-com <tesla-at-pupman-dot-com>
Date: Thursday, August 19, 1999 12:04 AM
Subject: Bottle Capacitor Questions

>Original Poster: "Albert Race" <race-at-dgms-dot-com>
>Well, I'm working on the tank capacitance for the primary circuit, and it
>looks as though I am going to be making my own. Haven't done this before,
>this is going to be a good thing. I was wondering if there is anyone out
>there that has any information on creating these "Bottle Capacitors"
>Regarding the dielectric constants for the different types of
>glass/oil/material being used  and basically any information needed to
>calculate the total capacitance for each bottle.. Also. information
>regarding voltage breakdown would be good to have as well. Also, what is
>best way to test one of these buggers anyways? Any/all information will be
>greatly appreciated....