I'll put in a word here for gallon mayonnaise jars. They worked fine for
our high school T coil, and the bank still works well many decades later.
Our coil was powered from three 15/30s and got four foot sparks from 18 jars
in parallel (~2nF each). Took up a lot of room, but glass is pretty
low-loss. Makes pretty blue discharges around the top of the foil, and it's
pretty impressive if done aesthetically. Of course if you're looking for
something practical, my suggestion would be to forget this modest
suggestion.
---Carl
-----Original Message-----
From: mrapol@xxxxxxxxxxxx
Sent: Monday, November 25, 2013 3:06 PM
To: Tesla Coil Mailing List
Subject: Re: [TCML] Unusual dielectric media
----- Original Message -----
From: "Jim Lux" <jimlux@xxxxxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Monday, November 25, 2013 4:25 PM
Subject: Re: [TCML] Unusual dielectric media
>
> Why are looking for high dielectric constant liquids to immerse capacitors
> in. Aren't you using it in this case as just an insulator. That is,
> you're not using it as the "inside" of the capacitor dielectric.
>
> Typically, for an insulator, what you look for is robustness (breakdown
> voltage doesn't change with small amounts of contaminants), lack of
> spoilage, etc. (most liquids have very similar breakdown voltages)
Yes, I am immersing ready-made capacitors (in this case, usually high
voltage ceramic "doorknob" caps) in high K media to suppress corona,
arc-over, etc. I have in the past potted Cockroft Walton multipliers and cap
arrays in paraffin wax, but I was curious to try some liquids with high K
values. I know many coilers use transformer oil or even motor oil to
insulate components, but glycerin and syrup have very high K values. So far,
glycerin has work very well.
PBT
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