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Re: big coil history



Original poster: "Jim Lux" <jimlux@xxxxxxxxxxxxx>

Maybe it's the quarter wave transmission line transformer thing?
Could it be Ferranti for spelling? (there's a well known Italian HV company
of that name)

----- Original Message -----
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Thursday, March 31, 2005 6:19 PM
Subject: Re: big coil history


> Original poster: "Dr. Resonance" <resonance@xxxxxxxxxx> > > > > The 1/4 lamda myth was strongly advocated and propagated by a number of > Physics textbooks many of which referred to it as "the Ferrenti Effect" --- > must be something Italian. > > Dr. Resonance > > > > > Take a nice lumped theory Tesla coil model like this: > > > > http://www.hot-streamer.com/TeslaCoils/MyPapers/modact/Image160.gif > > > > And try and work through it with pencil and paper ;-)) > > > > Today with computers and MicroSim like programs, "anyone" can do it!! But > > if one tries to do it the hard way (and many many have tried!!), you just > > can't do it.... Much like transmission line theory in 80's, the tools > were > > not there to workout the details.... Today, Antonio has many papers where > > those details "have" been worked to a very high degree! > > > > Also, today we can measure things with high confidence. In the 30's and > > 40's, they just did not have the test tools to "know" what was going > > on. It is always far easier to know what the system is doing with real > > measurements and "then" fit the theory ;-)) > > > > In the old days I am sure many worked things and found the terminal > voltage > > of a coil with say 10 foot streamers to be 300kV... Well, that was > > obviously "wrong" !! :o)) 10 feet at 10kV/inch is 1,200,000 > > volts... Tesla always gave coils super high voltages too... If the > > physics did not agree with Tesla then the physics was obviously wrong > > because Tesla certainly was not... I think a lot of the mess got started > > just that way... > > > > Of course, we all know who started the 1/4 wavelength of wire idea ;-))) > > > > http://www.pbs.org/tesla/tt/images/tt_main.jpg > > > > "Probably through misinterpretation of something Tesla said?" Actually, > > direct and accurate interpretations of what Tesla said... > > > > If he would have had a good scope, think of how different it would all be > > now!!!! If anyone gets that time machine working, we gotta send Tesla a > > scope!!! If Tesla had a scope, maybe we would have time machines now!! > ;o)) > > > > Cheers, > > > > Terry > > > > > > At 01:02 PM 3/31/2005, you wrote: > > >"Given that folks in the 30s and 40s were using the lumped LC analysis > > >approach (and it had certainly been around before that), it would be > > >interesting to see where, when, and why, the 1/4 wavelength of wire idea > > >started to be used." > > > > > > Probably through misinterpretation of something Tesla said? > > > > > >Ed > > > > > > > >