And Tesla had to walk out of the office with no money at all. That was the end of Edison-Tesla relationship.
In May 1885, George Westinghouse, head of the Westinghouse Electric Company in Pittsburgh, bought the patent rights to Tesla's polyphase system of alternating-current dynamos, transformers, and motors. The transaction precipitated a titanic power struggle between Edison's direct-current systems and the Tesla-Westinghouse alternating-current approach, which eventually won out, by getting the contract to power the mighty Niagara Falls cataract with AC. (Seifer, 1996).
On July 30, 1891, he became an American Citizen. "This, as he often told friends, he valued more than any of the scientific honors to come to him. Honorary degrees he tossed into drawers, but his certificate of naturalization was always kept in his office safe" .
During the 1890's he experimented with high voltage electricity, therefore, to explore this unknown world, he invented the Tesla coil, which is an instrument that can step out voltages to high voltages at high frequencies that essentially transmit a radio signal. .
Tesla soon established his own laboratory, where his inventive mind could be given free rein. Tesla's countless experiments included work on a carbon button lamp, on the power of electrical resonance, and on various types of lighting, such a first neon and fluorescents illumination. He also took the first x-ray photographs. Quickly he invented a wireless vacuum tube being this discovery, the beginning of Tesla's lifelong obsession, The Wireless Transmition of Energy. (Begich, 995).
By 1895, he was able to transmit a signal to west point New York, but one day, when he returned from a walk, he saw the building where his laboratory was located had been destroy by an accidental fire, and with this incident all the that Tesla had spent his life working on, had been lost in a fire that lasted only a hours.
