Nikola Tesla and His Works - On the Occassion of the Eightieth Anniversary Page 16

Tesla transmits signals without wires, gaining the conviction that signals can be transmitted wirelessly over any distance [15]. Following these experiments, he filed a large number of patents related to wireless transmission (U.S. Patents No. 685 953 and 685 955 dated June 24, 1899; 685 954 and 685 956 dated August 1, 1889; 685 012 dated March 21, 1900; 487 412 dated May 16, 1900; and 725 605 and 723 188 dated July 16, 1900).

Nikola Tesla is undoubtedly one of the most significant contributors to radio technology. His numerous experiments on high-frequency currents, resonance, and other phenomena in this field served as the foundation for this latest branch of electrical engineering. Recalling the beginnings of radio technology, the well-known German professor Zenneck, who also participated in this work, said: “When in the first years of wireless telegraphy, any patent application had to be rejected, Tesla’s lectures in Martin’s book or Tesla’s patent applications were mostly cited. Often there was already some idea for which protection was sought in the newly filed patent. Among the pioneers of wireless telegraphy, Tesla was undoubtedly one of the most prominent” [16]. In addition to the above, we will mention here only one similar case from the literature. In the German journal Elektrotechnische Zeitschrift from 1901, on page 688, the eminent French electrical engineer Blondel communicated by letter to the editorial board that the so-called multiplier, described by the German researcher Slaby in the same journal (E.T. Z. 1901, p. 40), cannot be considered as a new instrument since it was already known in France under the name Uden’s resonator. Slaby responded to this letter (E.T. Z., 1903, p. 1007) with these words: “I was not the first to notice the phenomenon I described in E.T. Z, 1901, p. 40. After my publication, Blondel noted that the same procedure for increasing voltage is used by the French doctor Uden in electromedicine. However, by examining the literature, it can be seen that Nikola Tesla observed and accurately explained this phenomenon even earlier. In a lecture before the Franklin Institute, which was printed [9], Tesla described the action of resonant tuned coils connected unipolarly to the circuit of alternating current with high frequency.”

6. Various Works

Tesla worked tirelessly and produced a very large number of works. His patents, numbering over a hundred, contain, in addition to the mentioned main ones, many other inventions. Working with high-frequency currents, Tesla protected the use of boiled oil for insulation, the construction of electrostatic capacitors, and methods of isolating electrical conductors. He further protected, in the field of electrotechnics,