RE: 3 Coil System Was: A photographic tutorial ofPancakeCoilwinding...with movies...(fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

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Date: Mon, 25 Jun 2007 09:50:18 -0500
From: David Thomson <dwt@xxxxxxxxxxxx>
To: 'Tesla list' <tesla@xxxxxxxxxx>
Subject: RE: 3 Coil System      Was: A photographic tutorial
    ofPancakeCoilwinding...with movies...(fwd)

Hi Bart,

> I think we have made some progress to understand views of 
> inductive coupling. Good discussion.

Yes, I agree.  You have corrected a couple errors in my thinking.

The inductive coupling on my coil must have existed, even though it was
minimal.  Still, that would explain why there was a discharge on the
topload.  As Bert was pointing out, a discharge of any kind demonstrates a
non-zero current.

According to the longitudinal wave idea I am developing, it would be
necessary to eliminate inductive coupling to eliminate current.  It is also
necessary to maximize potential by maximizing resonance.  

You made it clear to me that a coil can act as a capacitor in a three coil
system.  It is the capacitance I want to utilize in developing and
maintaining standing waves on the third coil.  So it makes perfect sense to
eliminate the wire windings of the third coil and simply use a copper tube.
Will the inductive coupling be the same for a copper tube, as opposed to a
wire wound tube?  I know that in a waveguide the copper tube will have
inductance and capacitance as though it were a wire wound coil.  But Bert is
saying a copper tube in a third coil position is not a waveguide because it
is too low of a frequency.

I am not interested in waveguide properties.  If there is no waveguide, then
there is no inductance, is this correct?  All I want is the capacitance
property of the tube so that I can create standing waves of electrons on it
and have no inductive coupling to the secondary.

I have the parts on order to build a telescoping tube for the third coil.
The telescope property is necessary from what I saw with JavaTC.  Changing
the capacitance changes the primary/secondary frequency, and changing the
primary/secondary frequency changes the capacitance needed for resonance
(The herding of cats thing).  Using my own speed of electron wave constant,
I calculated the range of the tube length I will need.  The tube would be
too long for a 1:1 octave ratio, so I'm using the 1:3 octave ratio
previously used in my combination coil.  In fact, I'm using the old 25.25"
flat spiral for this experiment since it has a better coupling ratio than my
new system.  If I can afford it, I'm also going to change the primary cap to
.0055uF.  

If you would post your method for measuring inductive coupling, either to
this list or to a web page, I would greatly appreciate it.  I want to do
some measurements of my own to get familiar with the coupling strengths in
various situations.

Thanks for all your expertise in this discussion.

David W. Thomson