Re: Corona Bottle Capacitance and twin coils...

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Antonio Carlos M. de Queiroz" <acmdq@xxxxxxxxxx>

Tesla list wrote:

>     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).

Someone probably has this measured. I don´t.

>     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).

Get a capacitance meter. Not expensive and very useful.

>     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.

No. External metal plates are to avoid the mess of the bottles immersed
in salt water. If you go for the water, the plates are not necessary.

>    ( 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.)

Can be precisely simulated if you give the dimensions of the coils.

>     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?)

Surely. Same inductance and same load capacitance. Otherwise the extra
coil is completely out of tune, and will not absorb significant energy.
Mount a telescopic antenna as part of the top load of the extra coil.
You can use it to tune the circuit precisely.

Antonio Carlos M. de Queiroz