Nikola Tesla Books
The very idea of transmitting thoughts without wires is a natural consequence of the latest research in the field of electrotechnics. We know today that electrical vibrations can be transmitted with only one wire, so why not attempt to use the Earth for this purpose...
âTheoretically, it should not require large amounts of energy for an electrical disturbance to spread over a very long distance, even over the entire surface of the Earth. However, it is entirely reliable that devices, at any point and at a certain distance from the source, with conveniently adjusted self-induction and capacity, can be set into operation by resonance. Therefore, I believe without a doubt that electric devices in a certain city can be put into operation by resonance and with the help of the Earth, using just one oscillator placed at the center. However, the practical solution to this question will be of incomparably less significance for people than the realization of the plan by which intelligible signals or even power can be transmitted to any distance through the Earth or the surrounding medium. If this is at all possible, then distances do not matter. First, suitable devices must be found to solve this problem, and I have dedicated a significant part of my work to this question. I am firmly convinced that this can be achieved, and I hope that we will all live to see it with our own eyesâ [9, 10].
Teslaâs currents found various applications. In medicine, they were used for treatments (Darsonvalization and diathermy) [11], and in chemistry for ozone production (Teslaâs patent No. 568 177 dated January 22, 1896). The magical light effects that Tesla achieved with them promised new ways of obtaining light based on luminescence, which were far more economical than methods based on incandescence. However, the greatest significance of Teslaâs currents was in radio technology. Professor Kiebitz from Berlin stated [12]: Teslaâs transformer represents the first application of what we now call the system of connected oscillating circuits. Its further applications include radiotelegraph transmitters and receivers, which Tesla proposed for this purpose in two patents from December 21, 1897. In works published from 1902 to 1904, the German physicist Paul Drude demonstrated that the phenomena in radiotelegraph transmitters are subject to the same laws as the oscillations in Teslaâs transformer, or in other words, radiotelegraph transmitters work with Teslaâs currents.
5. Radio Technology
The ideas about wireless transmission of signals and power that Tesla presented in his lectures in 1892 and 1893 [13] were realized in his laboratories a bit later. At the beginning
