Re: those folks at MIT (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- Forwarded message ----------
Date: Tue, 12 Jun 2007 17:25:35 -0700
From: Jim Lux <jimlux@xxxxxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: those folks at MIT (fwd)

At 03:40 PM 6/12/2007, you wrote:
>I believe the guys' experimental data and still find the paper 
>trivial and ludicrous - I hope your colleagues find a really old 
>reference covering the same subject. Certainly the work Lodge and 
>others did with Leyden jars connected to parallel lines qualifies 
>but there is probably something earlier.  The authors' acute 
>observation that the power transfer falls off rapidly with detuning 
>of either coil is really astonishing!  Brilliant guys!

I'm hoping for 18th century... so we can write a response:

Kurs, et al., seem to have overlooked the work of Volta(), etc.etc.etc.
Faraday(183x), and later Maxwell(18xx), put this phenomena on a firm 
analytical foundation, etc.etc.

The selection of an incandescent light bulb, as advocated by 
Edison(19xx), is not without precedent, however the nonlinearities of 
such a load, etc.etc.


>         They had a bunch of references including a Tesla patent 
> which doesn't really apply, but a single reference to any issue of 
> The Radiotron Designer's Handbook would have sufficed.  If they had 
> read it and understood it they wouldn't have published [maybe - 
> they're on an ego trip so who knows?].  Their equation for coil 
> resistance is too complicated for me to bother to understand


Their equation (6) is just the resistance for a layer one skin depth 
thick with width = circumference of wire and length L.  They've 
rolled the skindepth and conductivity together (since skin depth 
depends on conductivity)  The left part (the square root) is just the 
2*effective resistivity. so you get R = resitivity * length/area