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Summary
A "Kinraide coil", a resonant transformer circuit that generates high voltage, low current, high frequency electricity invented by Thomas Burton Kinraide in 1898. It is similar to a Tesla coil but produces higher currents. Kinraide used it to power x-ray tubes in the early 20th century. It produced more penetrating x-rays than existing induction coil circuits, able to make images of the heavy trunk bones. Information from Kinraide coil, Electrotherapy Museum website
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.