Tesla

I am coming to a chapter in my life which was very fruitful. We were driving toward perfection and that if we attained it, the alternator would be simply thrown away as an absolutely useless instrument. To this end I built a great many machines of a novel type, which I called oscillators and it is with these that my best results in the investigations of these phenomena, applicable to wireless in many of its phases, were obtained.

Counsel

What would an engineer have to do to the wireless systems of today in order to produce very little radiation of electromagnetic waves and produce a large amount of these earth currents?

Tesla

He would have to construct and operate the apparatus described in my patents and in my lectures. I designed a plant years ago with a large capacity. In order to lower the frequency so that there would be no wasteful radiation of energy, you have to employ a large inductance. You have to employ a capacity as large as permissible, and you must use a large inductance in order that you may reach the low frequency which is economical.

The currents are proportionate to the potentials which are developed under otherwise equal conditions. If you have an antenna of a certain capacity charged to 100,000 volts, you will get a certain current; charged to 200,000 volts, twice the current. When I spoke of these enormous potentials, I was describing an industrial plant on a large scale because that was the most important application of these principles, but I have also pointed out in my patents that the same principles can be applied to telegraphy and other purposes. That is simply a question of how much power you want to transmit.

Counsel

Tell me what D P stands for?

Tesla_Magnifying_Transmitter

Tesla

That is a curved plate. The plate has a large radius of curvature. You see, it is to be borne in mind that, in a general way, electricity will accumulate in the same way as the curvature of the surface has a smaller radius. This is an old truth which has been recognized 200 years ago. The design contemplates an arrangement whereby nowhere is electricity accumulated in excess. I am at a substantially uniform distribution of electricity in this structure, not only in the structure, but along the whole circuit where there is a high potential. This, of course, is simply to illustrate the principles. If you design a machine like that, it will be very much superior to those now in existence, but I have since that time introduced refinements and can produce very much better results than it would be possible with just exactly that construction.

Counsel

You have spoken of the fact that you could use either the alternator or the transformer, and you have illustrated in this diagram a condenser at G?

Tesla

Yes.

Counsel

And stating, I believe, that that represents to your mind any method of getting continuous waves. I think you said, previously, that you actually used either of these methods at Colorado and still had continuous generation.

Tesla

Yes.

Counsel

Was the method you used there, a spark? -- an arc? -- or what was the method where you got continuous generation?

Tesla

The method was this: I had a 550-volt current with which I charged the condensers. These condensers I discharged through a primary in the form of an arc, sometimes I also introduced in this arc a mechanical break of several thousand per second. And I obtained a perfectly continuous train of waves as has been described in my patents. The reason why I show the condenser here [Fig. 83] is that that is synonymous with undamped waves. If I had shown the whole apparatus as arranged there, then I might still have damped waves; but whether I use an alternator or some other way of getting energy to that condenser, the condenser is usually there. For instance, if I use an alternator, I shunt its terminals with a condenser in order to magnify the current in the primary. I then tune this circuit to the alternator, and magnify the current in the primary in the ratio of the inductance to the resistance. Therefore, this condenser here stands for either method, and simply means that in this system, as is obvious from the description in the patent, the waves are undamped because high rises of potential would not be obtained otherwise. Whenever I wanted to obtain a high potential, I had to observe these rules in order to force the potential up to that value.


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