Re: Extra coil

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Malcolm Watts by way of Terry Fritz <twftesla-at-qwest-dot-net>" <m.j.watts-at-massey.ac.nz>

Hi Nele,
          I must confess that I share John Feau's view of magnifier 
operation. In fact, one of my first measurements on one confirmed 
what he said and was previously postulated by Dr de Queiroz, notably 
the value of Ksys. I too have read Tesla's notes on this but think 
that what he thought and what actually happens are two different 
things with respect to this particular form of TC. It is a nice idea 
to think that the primary/secondary act like an oscillating voltage 
source but in a disruptively-driven system they cannot for two 
reasons: K for the pri-sec system is less than 1 and secondly, it is 
driven from a charged capacitor (which runs down to empty), not a 
voltage source (zero internal impedance generator).

    Once the gap has gone out in a 2-coil system, there is 
fundamentally no difference in the way that resonator behaves to the 
extra coil/secondary system in the 3-coil machine, save that under 
certain conditions of relative inductances and coupling between the 
two as outlined in paper on Dr de Queiroz's website, the two might 
have energy transferring between them and ending up in one or the 
other in its entirety. In other words, a coupled double-tuned circuit 
is still present in the 3-coil machine, even after the gap has 
extinguished. Clear as mud I'm sure :)

      I would also like to add that I built a scaled miniature of the 
CS machine a couple of years ago and found that there is significant 
coupling between the extra coil and secondary, not entirely 
unexpected I have to say given the arrangement of the coils. The 
value I measured was confirmed by Dr Rzsesotarski's excellent MandK 
program (it was about 0.06 if I remember rightly). The physical 
arrangement developed by Robert Golka (the extra coil was no longer 
co-axially mounted) to the pri-sec system came closest to the nirvana 
Tesla was after but the coils were still coupled by virtue of a 
physical connection.

Regards,
Malcolm

On 6 Feb 2002, at 7:47, Tesla list wrote:

> Original poster: "Nebojsa Kovacevic by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <morfeus-at-EUnet.yu>
> 
> 73
> Hello All!
> 
> Most of the people are confused with the part of the Tesla coil which he
> named "extra coil". In his lab we can clearly notice three separated
> parts: primary circuit, secondary circuit and the thing that Tesla calls
> "extra coil". Primary coil transforms the AC currents of 140Hz from the
> primary transformer into the high frequency currents (radio frequency).
> The purpose of the secondary coil is to on a specific frequency produce
> energy for the helicoidal resonator. Complexe construction of the extra
> coil makes the perfect conditions for using the possibilities of the
> helicoidal windings as a slow wave resonator. This type of coil is now
> days known as opened helicoidal resonator.
> The configuration we are comonly using today is producing high voltage
> only (high energy). But if we want to get high voltage and high
> amperage, we should construct the system with tertiary coil.
> Let`s take a look at the Tesla`s apparatus as a perfect example. He used
> adjusted main oscillator for transform low frequency to radio frequency
> currents. Primary coil has very high inductive relation with the
> secondary, which has the serial resonance of the same frequency as
> adjusted helicoidal resonator from which Tesla emitts his streamers.
> Many people are surprised that the secondary coil is adjusted on the
> exact frequency as the primary coil. The real attention should be paid
> on the extra coil which spectaculary dominating on the central part of
> his lab.
> Rotary break is the most important part in the constuctions with extra
> coil. Before all, for a high power you need as many breaks as you can
> acchieve per second. Everyone has to have in mind that high amperage in
> the coil doesn`t mean very high voltage. The power which is transmitted
> to the secondary coil is proportional to the number of the breaks in
> second. Other usefull aspect of the break is the break duration which is
> the key for a proper functioning of the primary and secondary coil. The
> time duration of the spark in the break is the time in which the spark
> really exists in the gap before it shuts down.
> While the spark is in the gap, the system will oscillate on the two
> frequencies (two line system so to call it). Spectral diference, or the
> frequency diference is proportional to the magnetic relation between the
> primary and the secondary circuits. To get the max. results, these two
> frequencies should have the frequency diference DF.
> All this means that with incresing the inductive relation between the
> primary and the secondary, the time of the spark in the gap should be as
> shorter as possible. But, in the case of critical relation between the
> coils, DF is falling to zero, so the duration of the spark isn`t a
> controll parameter any more.
> 
> The readers familiar with the problem must ask them selfs, why to build
> an extra coil? Isn`t the finall goal we are all trying to acchieve,
> generating a high potencial (energy)? This is true if we want to get
> only high potencial. Hmm....our friend Tesla must have wanted more. In
> Colorado, he wanted to get  high potencial and very high power.
> We are all aware of the two frequencies that builds in the system with
> very high inductive related coils(primary and secondary). The phenomenon
> of two frequencies. This can be seen as a two frequency spectre on the
> o-scopes with primary and secondary coils with concentrated parameters.
> Extra coil should be noted as a diferent part of the system, comparing
> to the one we have in the primary-secondary system. (When it is compared
> with the secondary coil, it`smagnetic relation to the primary coil is
> minor). Extra coil is infact 1/4 wave lenght helicoidal resonator.
> Analise of the tertiary coil as a concentrated parameter circuitry is
> absolutly unsuccessful.
> In every way, the looses should be cut down in the tertiary coil.
> Helicoidal resonator on lower frequencies is only a coil of the small
> diameter with high number of turns of wire, placed above the ground.
> Coil, with capacitor on the top acts as a 1/4 wave lenght "antenna"
> which doesn`t emitts. Instead of the vertical tower a few thousands of
> feets high - real aerial, Tesla had the resonating coil which doesn`t
> emitts, and it`s hight was only a part of that hipotetic tower. The
> nature of the slow waves in the coil is what makes all this possible. It
> should be paid attention on a few things about the helicoidal
> resonators:
> The base or entry will have the characteristical low impendance, and on
> the top (or the high frequency exit), will have high impendance. This
> means that in the purpose of the activating the coil Tesla had to
> connect a very high currents to the base of the extra coil. That way, as
> much electricity you put in the base of the extra coil, with  properly
> adjusted frequency, the more electricity you will get on the top of the
> coil(terminal). The currents on the top depends on the high frequency
> currents in the base of the extra coil, short wave voltage ratio, and
> the characteristical impendance of the resonator. All these claims can
> be measured and calculated very easily. Besides, as tertiary coil can be
> used any 1/4 wave lenght resonator which doesn`t emitts - helicoidal
> resonator, coaxial resonator, even microwave owen!
> I am hoping that in this point, every reader is abble to see that the
> combination of the primary and the secondary coils is, efectivly, only
> one powerful oscillator of the high energy, which brings the currents of
> the low voltage and high amperage in the base of the extra coil, in
> order to build a high potencial high energy currents.
> 
> I think that we should add this coil in our constuctions finally......
> 
> Regards,
> Nele
> 
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