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Summary
An early Tesla coil constructed by Nikola Tesla at his laboratory at 35 South Fifth Ave., New York around 1895. The voltage produced at the top terminal of the conical secondary coil may have been several hundred thousand volts, at a frequency around 1 MHz, producing a purple brush discharge, which is slightly exaggerated in this time exposure. At left are glass plate capacitors that formed the tuned circuit with the primary of the coil.
Caption: TESLA COIL FOR ASCERTAINING AND DISCHARGING THE ELECTRICITY OF THE EARTH. THE STREAMERS AT TOP ARE OF PURPLE HUE, AND IN FORM RESEMBLE FILAMENTS OF SEAWEED, THE EFFECT OF MASS BEING CAUSED BY PROLONGED EXPOSURE OF FLASH-LIGHT NEGATIVE
Nikola Tesla (1856–1943) Serbian American inventor and engineer who discovered and patented the rotating magnetic field, the basis of most alternating-current machinery. He also developed the three-phase system of electric power transmission. He immigrated to the United States in 1884 and sold the patent rights to his system of alternating-current dynamos, transformers, and motors to George Westinghouse.
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