The condenser banks at his experimental station consisted of tanks filled with brine and empty mineral water bottles set in the tanks with brine inside. As most will recall from his earlier writings, air bubbles in high-frequency, high-voltage equipment must be completely avoided. At his experimental station in Colorado Springs, Tesla took the construction of his condenser banks to a higher refinement level. The condenser may seem simple enough as long as it can withstand the excitation voltage plus the resonant voltage rise in the primary circuit. In this case, it is determined by the distributed capacity of the secondary for both the self-resonant frequency of oscillation and the envelope rise to a maximum. The envelope of the oscillation wave train is defined by y = lnx/ x, the expression for the life of any energy system. Oscillographic measurements reveal that the oscillation in the secondary begins from birth, rises in strength to full expression (maximum), then decays (ring down). Jim Corum has done important work showing exactly what happens from the instant when a pulse of energy from the primary of a Tesla coil is assimilated by the secondary. For such resonant transformer circuits as Tesla employed, the coefficient of coupling was high, which necessitated an ideal gap that could transfer the energy from the primary to the secondary in not much more than a few cycles. It is not known how he measured this, and many thought he was boasting. In an article appearing in the Electrical Experimenter magazine, 5 Tesla claimed 97% efficiency for his oscillation transformer system without explaining that it was achieved by impact excitation. More recently, an excellent article by Ed Kagle on the subject of impact excitation appeared in Harry Goldman's Tesla Coil Builders Association newsletter. Ideally, a monopulse exciting the secondary is sought, but in practical terms, it is rarely, if ever, achieved. Close coupling with rapid quenching of the gap is required. In the dash to produce continuous waves for variable modulation, impact excitation was all but forgotten. John Ambrose Fleming's exhaustive book, The Principles of Electric Wave Telegraphy and Telephony, 3 among other topics of Tesla's work, describes “impact excitation.” Ambrose is the only scientific/technical author I have found to do so during that time period. Martin's book, The Inventions, Researches and Writings of Nikola Tesla, 1 which has now become a classic in several reprint editions and is available from several sources, and in Nikola Tesla on His Work with Alternating Currents. Tesla preferred multiple series gaps, sometimes more than 10, as illustrated in T. The Gapįigure 1 - Tesla's design for multiple series gaps.The quality of the gap is perhaps the most critical factor determining the performance of a Tesla coil system. After all, Tesla derived his income from techniques that he developed and kept close to his chest, and he patented those that were possible. During the latter of those years, pieces of information have come together making more of his work clear. We are honored and pleased to present to our readers this cumulative effort of this premier Tesla historian, author and researcher.Īfter more than forty years studying the technical work of Nikola Tesla, I thought it appropriate at this time to review certain aspects of it. The reader is also treated to a number of rare historical tidbits related to Tesla's work. All of the foregoing coupled with his engineering background and personal contacts with many modern Tesla experimenters, researchers and writers make his comments particularly valuable in both an engineering and scientific sense. The author is known to have owned and maintained over the last half century the largest holding of original Tesla documents and images to be found in private hands anywhere in the world. These are the result of a lifetime of study based on the author's interviews with living contacts who knew Tesla. © 2022 Los Angeles Rams.The following article is a collection of final thoughts from Leland Anderson regarding Nikola Tesla's work.
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