1885, Tesla left Edison Company and met George Westinghouse, the head of Westinghouse Company. With his support, Tesla officially brought alternating current to the society at that time in 1888. 1At the Columbia Expo in May, 893, Tesla demonstrated AC lighting and became the winner of the "current war". After that, Tesla won the right to undertake the power design of Niagara Hydropower Station.
Since then, alternating current has replaced direct current as the mainstream of power supply. Tesla, on the other hand, has the patent right of alternating current. At that time, it had to pay Tesla a patent fee of $2.50 for every horsepower of alternating current sold.
Driven by strong interests, a consortium threatened Tesla to give up this patent right with the intention of monopolizing profits. After many negotiations, Tesla decided to give up the patent of alternating current, provided that the patent of alternating current was made public permanently. Since then, he tore off the patent of alternating current and lost the right to collect patent fees. Since then, alternating current has not been patented and has become a free invention.
If the invention patent of alternating current is not given to all mankind for free use, and alternating current brings him a "patent fee" of 2.5 dollars per horsepower, he will be the richest man in the world.
Up to now, Serbian banknotes are still printed with nikola tesla's head.
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In the early research, Tesla did many experiments to produce X-rays. Tesla believes that with his circuit, "the energy of X-ray light (that is, X-ray) that my instrument can produce is much greater than that of ordinary instruments."
He also talked about the harm of using his circuit and single-node X-ray generating equipment in his work. In many records of his investigation of this phenomenon, he attributed many causes of skin damage to. He believes that the early skin damage is not caused by X-rays, but by the contact between ozone and skin and some nitrous acid. Tesla mistakenly believes that X-rays are composed of separated particles.
Tesla completed some experiments before Roentgen and confirmed his findings (including taking X-rays of his hands and then sending them to Roentgen), but he didn't let his findings be widely known. Most of his research materials were burned in a laboratory fire on Fifth Avenue in March 1895.
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