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Re: Tesla Coil Operation - was "Harmonics"
Very interesting. I am lucky. Resonance does not have to happen
fundamentally.
Most nonlinear systems resonate subharmonically.
> From tesla-request-at-pupman-dot-com Mon Jan 18 11:44 GMT 1999
> Resent-Date: Mon, 18 Jan 1999 02:00:53 -0700
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> Date: Sun, 17 Jan 1999 22:10:07 -0700
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> Subject: Re: Tesla Coil Operation - was "Harmonics"
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> From: Tesla List <tesla-at-pupman-dot-com>
>
> Original Poster: "D.C. Cox" <DR.RESONANCE-at-next-wave-dot-net>
>
> to: Antonio
>
> An interesting corollary is to use a long shaft of semi-flexible material.
> Attach pendulums (sorry -- no penduli) of different mass. As the first
> pendulum in activated the pendulum of the same mass located further down
> the shaft will begin to oscillate as you described. The interesting part
> is that pendulums of different mass do not oscillate (very small amplitude
> if at all) which dramatically illustrates the concept of tuned circuits
> while other nearby circuits of different frequency (mass in our mechanical
> example) oscillate only a very small amount.
>
> We have made this exhibit for various museums and the children are always
> amazed that both nearby pendulums and pendulums of lighter mass don't start
> to oscillate first. It's a simple exhibit to fabricate and is very
> instructive for anyone to use prior to the Tesla coil demonstration of
> electrical resonance.
>
> DR.RESONANCE-at-next-wave-dot-net
>
>
> ----------
> > From: Tesla List <tesla-at-pupman-dot-com>
> > To: tesla-at-pupman-dot-com
> > Subject: Re: Tesla Coil Operation - was "Harmonics"
> > Date: Sunday, January 17, 1999 6:54 AM
> >
> > Original Poster: "Antonio Carlos M. de Queiroz" <acmq-at-compuland-dot-com.br>
> >
> > John H. Couture wrote:
> >
> > > The Tesla coil operation has no mechanical or other electrical
> analogy.
> >
> > It has. Two pendulums (penduli?) with identical lengths (same resonant
> > frequency) and different weights (different impedance levels) are
> > coupled in a way that produces a high swing in the lighter pendulum
> > when the swing in the heavier pendulum is small (a transformer
> > with high turns ratio). This may be a light inclinated bar connected
> > to their strings (use a fixed width font to see the ASCII drawing):
> >
> > ==+===+==
> > | |
> > |\ |
> > | \ |
> > | \|
> > | |
> > o O
> >
> > If you set the heavier pendulum in motion ("O", the "primary"), it
> > will make the lighter pendulum ("o", the "secondary") swing with
> > increasing amplitude, as its swing amplitude decays. Eventually
> > only the lighter pendulum is oscillating, and the process reverts.
> > The result is the same beating oscillations observed in Tesla coils.
> > I tried this experiment, and it works perfectly.
> > No sparks, of course ;)
> >
> > Antonio Carlos M. de Queiroz
> >
> >
>
>
>