TSSP: List Archives

From: "Terrell W. Fritz"
Date: Sun, 08 Oct 2000 18:47:03 -0600
Subject: Re: [TSSP] The Corum's model?

Hi Paul,

>it's not a presentation of a theory, just a poorly 
>written, ranting and misleading tutorial. 

Gee, that was the good paper too! :-)   I think Malcolm was probably
referring to the following:

http://63.225.104.49/TeslaCoils/OtherPapers/Corum1/

	The Corum's "100 years of Cavity Resonator Development" is well known and
those that study secondaries should be at least aware of it.  The graph (a)
at the top of page 2-8 is the effect that gets Malcolm and me so excited
;-)  I have reproduced this experiment and found zero evidence of it's
existence.  I'll leave it at that...

Cheers,
	
	Terry


At 11:55 AM 10/8/2000 +0100, you wrote:
>Thanks Barry and Terry for the pointer to
>
> http://www.ttr.com/corum/index.htm
>
>I *have* seen this one before - but I didn't think it was relevant to 
>our discussion - it's not a presentation of a theory, just a poorly 
>written, ranting and misleading tutorial.                          
>
>Malcolm, perhaps this is not the Corum 'theory' you were thinking
>of?
>
>I'll comment on it anyway!
>
>The authors are advocating a transmission line model as a better
>description of a tesla resonator than the lumped model. OK, thats
>fine and obvious. But then in doing so they perpetuate the mistaken 
>belief that transmission line resonance represents a different mode of
>operation of a tesla coil, compared with 'lumped operation'.
>
>Corums wrote:
>
>> If lumped analysis describes your coil, cheer up - modify its
>> operation to an open resonator and you'll see what Tesla called,
>> on July 11, 1899, "a beautiful advance in the art"!
>
>A 'lumped component' is of course a theoretical fiction, approximately
>valid for frequencies where the electrical length of the component is
>small compared to the wavelength in the component. It's convenient 
>because it allows us to do circuit theory, it certainly doesn't offer
>an alternative mode of operation!
>
>(See my recent attempt to quench this myth, in the list,
> http://www.pupman.com/listarchives/2000/August/msg01119.html)
> 
>Most of the rest of the article is spent with a mediocre, incomplete,
>but essentially correct description of transmission line theory as
>applied to the behaviour of tesla secondaries. This is just a
>restatement of conventional understanding. No new theory is offered,
>no predictions, and no testable proposals for improving performance. 
>
>Regards,
>--
>Paul Nicholson,
>Manchester, UK.
>--


Maintainer Paul Nicholson, paul@abelian.demon.co.uk.