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1/4 Wave Theories - What now?
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From: Malcolm Watts [SMTP:MALCOLM-at-directorate.wnp.ac.nz]
Sent: Tuesday, June 02, 1998 4:53 PM
To: Tesla List
Subject: Re: 1/4 Wave Theories - What now?
Hi All,
> From: D.C. Cox [SMTP:DR.RESONANCE-at-next-wave-dot-net]
> Sent: Monday, June 01, 1998 12:30 PM
> To: Tesla List
> Subject: Re: 1/4 Wave Theories - What now?
>
> to: Terry
>
> I think most of the capacitance is turn to turn but it would be very easy
> to test your theory. Measure the cap of a secondary inductor and then
> elevate it approx 25-30 feet above ground (in a sense isolate it from any
> nearby ground plane) and then measure the capacitance again. If the cap is
> turn to ground the value should diminish considerably --- if the cap is
> turn to turn as I suspect the value should not change very much. You could
> elevate it on some plastic spools, a wooden pole, or even a bunch of
> cardboard boxes stack up high. A simple test that will validate your
> theory or invalidate it.
>
> DR.RESONANCE-at-next-wave-dot-net
I have actually done this with a number of coils and Cself does
diminish. I think there is a point where one runs into a law of
diminishing returns though. Typically, one still has a lead running
up to the base of the coil in order to drive it for measurement
purposes and this itself adds capacitance to the system. This is
precisely the problem Tesla ran into when trying to measure the
capacitance of elevated "isolated" spheres. They were never truly
isolated and Richard Hull made some interesting observations about
this in the Guide to the Notes. Perhaps he could say more about this.
Also, the further the coil is elevated, the smaller is the fractional
distance moved from ground.
Malcolm