RE: Corona Bottle Capacitance and twin coils...

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Mark Dunn" <mdunn@xxxxxxxxxxxx>


Dave:

I built a bottle cap with Miller Genuine Draft bottles some years ago.
Each bottle gave me .75 nF.  (24) bottles achieved 18 nF.  You can get a
DVM at Radio Shack for $50 that measures capacitance AND frequency.

You don't need aluminum foil on the outside if you prtially submerge in
a bucket of saltwater.  I used foil and set the bottles in a wood box on
a glass sheet with a brass sheet on top of the glass.  My salt water was
only on the inside of the bottles.  Works both ways, though.

Mark




-----Original Message-----
From: Tesla list [mailto:tesla@xxxxxxxxxx]
Sent: Monday, July 25, 2005 1:25 PM
To: tesla@xxxxxxxxxx
Subject: Corona Bottle Capacitance and twin coils...


Original poster: Davetracer@xxxxxxx


     Could someone who knows please post the capacitance of one (or
ten, or whatever) Corona bottles, filled with salt water internally
and externally to within 2 inches of the top? I know this has been
discussed but I can't find it in the archives (probably due to pilot
error).

     Right now I have qty 12 in parallel, but I do not have anything
like a capacitor meter. (I am building Terry's oscillator to help
find resonant frequency, but am stuck on a few parts; Radio Shacks,
etc, are few and far between around here).

     Second question: Does it really matter if I wrap the Corona
bottles in aluminum foil prior to mostly submerging them in the salt
water? If it makes a big difference I'll do it, but right now the
water in there is as salty as possible.

    ( If a reference is needed for the size of a cap needed, I'm
running a 12kv, 60 ma NST, ~~ 10 turn primary, ~~500 turn secondary.)

     Third question: I have another secondary which is wound exactly
the same as the original secondary (to within a turn or two). I am
more or less expecting to see some energy transfer from the main
secondary to the auxiliary secondary, but so far, not much more than
any grounded probe generates.  no go.  Hints? Ideas? Would I need to
put a cap on the aux secondary to tune it to the main secondary's
resonant frequency (e.g., LC, not just L?)

     -- many thanks,

     Dave Small