Re: big coil history

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Dr. Resonance" <resonance@xxxxxxxxxx>


Yes, Ferranti is the correct spelling.

Dr. Resonance


>
> 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
>  >  >
>  >  >
>  >  >
>  >
>  >
>
>