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TEKA0005602, Tekniska museet, Sweden
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Summary
A homemade Tesla coil transformer from 1908. It consists of a primary winding of about 12 turns of thick copper wire on a large cylindrical form around a secondary winding of thousands of turns of fine wire. Unlike most modern coils this has a bipolar output: both ends of the secondary are attached to high voltage electrodes at top, and during operation a spark jumps between them. The primary is located midway between the high tension ends, to discourage arcs striking it.
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.