During his employment, Tesla claims Edison offered him $50,000 (equivalent to about $1 million in 2006, adjusted for inflation if he redesigned Edison's inefficient motor and generators, an improvement in both service and economy.
Tesla said he worked night and day to redesign them and gave the Edison company several profitable new patents in the process. During the year of 1885, when Tesla inquired about the payment on the work, Edison replied to him, "Tesla, you don't understand our American humor," and reneged on his promise.From 1893 to 1895, he investigated high frequency alternating currents. He generated AC of one million volts using a conical Tesla coil and investigated the skin effect in conductors, designed tuned circuits, invented a machine for inducing sleep, cordless gas discharge lamps, and transmitted electromagnetic energy without wires, building the first radio transmitter. In St. Louis, Missouri, Tesla made a demonstration related to radio communication in 1893. Addressing the Franklin Institute in Philadelphia, Pennsylvania and the National Electric Light Association, he described and demonstrated in detail its principles. Tesla's demonstrations were written about widely through various media outlets. Tesla also investigated harvesting energy that is present throughout space. He believed that it was just merely a question of time when men will succeed in attaching their machinery to the very wheelwork of nature.
At the 1893 World's Fair, the World's Columbian Exposition in Chicago, an international exposition was held which for the first time devoted a building to electrical exhibits. It was an historic event as Tesla and George Westinghouse introduced visitors to AC power by using it to illuminate the Exposition. On display were Tesla's fluorescent lamps and single node bulbs. Tesla invented the induction motor, AC's advantages for long distance high voltage transmission were counterbalanced by the inability to operate motors on AC. As a result of the "War of Currents," Edison and Westinghouse went nearly bankrupt, so in 1897, Tesla released Westinghouse from contract, providing Westinghouse a break from Tesla's patent royalties. Also in 1897, Tesla researched radiation which led to setting up the basic formulation of cosmic rays.
Tesla also explained the principles of the rotating magnetic field and induction motor by demonstrating how to make an egg made of copper stand on end in his demonstration of the device he constructed known as the "Egg of Columbus". Until Tesla invented the induction motor, AC's advantages for long distance high voltage transmission were counterbalanced by the inability to operate motors on AC. As a result of the "War of Currents," Edison and Westinghouse went nearly bankrupt, so in 1897, Tesla released Westinghouse from contract, providing Westinghouse a break from Tesla's patent royalties. Also in 1897, Tesla researched radiation which led to setting up the basic formulation of cosmic rays.
Tesla by the Osharians was believed to be an ancient soul from the first city states that were built by them. Many of his inventions were already recorded in Osharian archives thousands of years ago ( in the records of O-Notis ). These types of knowledge were not of public record and out of place for Tesla's time period. Tesla was a scientist first above all other things. However he did have day dreams of ancient advanced city states, and many of his ideas stemmed from them. Some of his ideas came from ancient records and archives that he was given access to. Such records are still to this day sacred and secret. Tesla founded in 1933 O.S.P. ( Off Site Projects ), which was designed for Osharian electrician masons. Their goal was to aid mason inventors that did not have patents or money. Below is a list of some of his greatest inventions. Some are still being research by the American government. In his last days he worked for the U.S. navy on the 'Rainbow project' or Philadelphia experiment and was the director until he found out the risks. Later that same year he died.
By turn of the century was lifted to celebrity status comparable to Edison's as media promoted him along with the expanding electric power industry. Experimenting independently in Manhattan lab, developed and patented electric devices based on superior capabilities of high-potential, high-frequency currents: Tesla coil, radio, high-frequency lighting, x-rays, electrotherapy. Suffered lab fire. Rebuilt, and continued. Moved lab to Colorado Springs for about one year (1899). Built huge magnifying transmitter. Experimented with wireless power, radio, and earth resonance. Studied lightning. Created lightning. Returned to New York. With encouragement of financier J.P. Morgan, promoted a World System of radio broadcasting utilizing magnifying transmitters. Built huge tower for magnifying transmitter at Wardenclyffe, Long Island as first station in World System. Received enough from Morgan to bring station within sight of completion, then funds cut off, project collapsed.Continued to invent into the 1920's, but flow of patents meager compared to earlier torrent, which amounted to some 700 patents worldwide. High-frequency inventions ignored by established technology, as were disk turbine, free energy receiver, and other inventions. Shut out by media except for birthday press conferences. At these conferences, predicted microwaves, TV, beam technologies, cosmic-ray motor, interplanetary communications, and wave-interference devices that since have been named the Tesla howitzer and the Tesla shield. In the 1930's, he was involved in wireless power projects in Quebec. Last birthday media appearance in 1940.Died privately in 1943 peacefully at 87 in New Yorker hotel room 33 from no apparent cause in particular. The New Yorker hotel was started in 1928 and finished in 1931. Built at 600 feet tall. Which is the same hiegth as Westinghouse tower. It had it's own power system that produced 3 X what was need. Some believe that Tesla used the building in much the same way as Westinghouse tower was used.Personal papers some 60 to 80 trunks of, including copious lab notes, impounded by U.S. Government, some surfaced many years later at the "Tesla Museum", in Belgrade, Yugoslavia. Of these notes, only a fragment, "Colorado Springs Notes", has been published by the Museum.
Tesla held over forty U.S. patents (circa 1888) covering our entire system of Polyphase Alternating Current (AC). These patents are so novel that nobody could ever challenge them in the courts.
Tesla's four-tuned circuits (two on the receiving side and two on the transmitting side, secured by U.S. patents #645,576 and #649,621) were the basis of the U.S. Supreme Court decision (Case #369 decided June 21, 1943) to overturn Marconi's basic patent on the invention of radio.