The dielectric (radiant) field of a bifilar pancake tesla coil @resonant freq.

[Nodir]

Tesla: My transformer creates an electrostatic field of very high voltage, which allows you to pour the air into the top of the device, with incredibly low energy costs. Flowing into the lower part of the device, the ether does a useful job of inducing EMF in the removable coils of the third stage.
Tesla: Almost certainly one can say that the effects of static electricity are a manifestation of the static deformation of the ether, ...,

[Nodir]

For those wishing to experiment, I propose to wind as follows:
We take aluminum or copper foil in the form of strips of tape, in an amount of 4 pcs. Fold them alternating with a tape of dielectric material.

The resulting sandwich is rolled into a roll. It will be necessary to arrange wire leads at the beginning and end of each of the outer bands. These two outer bands will be the windings of the bifilar coil. It is also necessary to organize conclusions from two internal tapes, only at the beginning or only at the end. These two internal belts will be the overlays of the interwinding capacitor.
In this way, we will radically increase the capacity of the internal capacitor!

[Nodir]

It is a flat coil wound in two wires, in which the end of the first wire is connected to the beginning of the second one. In fact, these are two series-connected inductors.
Tesla himself declares that it is an electromagnet. But this is a very strange electromagnet, flat and without a magnetic core.
T.zh. He states that he can provide any (theoretically) necessary capacity and potential difference. This is entirely possible if the coil is wound with flat wires (foil). Then, depending on the width of the flat wire and the number of turns, you can get any distributed capacitance, with any inductance.
Another feature of its coil, is that between two arbitrary turns, there is a potential difference equal to half of the total voltage acting on the coil. And if there is a potential difference, there is also an electric field. The dielectric placed in this field will be polarized. In order to remove polarized charges, it is necessary to apply two plates to the dielectric. Having done this, we will get an inductor with an integrated, interwinding capacitor. The current of the interwinding capacitor will be perpendicular to the current of all coils!!!

[Nodir]

In practice, such a coil can be made from 4 layers of foil with a dielectric spacer between them. The two outer layers will be the windings A and B of the patent, and the two inner layers are the plates of the integrated capacitor.
Adding the design of the inductor to several turns, we get a three-step step-up transformer, about which Tesla spoke.

[Nodir]

Primary wetting, together with the capacitor, form a high-Q rezonance circuit.
Secondary bifilar winding serves to create a high-potential electric field.
The energy is removed from the third stage - the interwinding capacitor. The direction of the current of the third stage, perpendicular to the current in all the coils!
Efficiency increases with increasing frequency.