Nikola Tesla was born an ethnic Serb in the village Smiljan, Lika county, in the Austrian Empire (present day Croatia), on 10 July [O.S. 28 June] 1856.

Tesla's father, Milutin, was priest in the village of Tesla would later write that he became interested in demonstrations of electricity by his physics professor. Tesla noted that these demonstrations of this 'mysterious phenomena' made him want 'to know more of this wonderful force'. Tesla was able to perform in his head, which prompted his teachers to believe that he was cheating. He finished a four-year term in three years, graduating in 1873.

In 1873, Tesla returned to Smiljan. Shortly after he arrived, he contracted, was bedridden for nine months and was near death multiple times. Tesla's father, in a moment of despair, (who had originally wanted him to enter the priesthood) promised to send him to the best engineering school if he recovered from the illness. In 1874, Tesla evaded into the in Smiljan by running away southeast of Lika to, near. There he explored the mountains wearing hunter's garb. Tesla said that this contact with nature made him stronger, both physically and mentally.

He read many books while in Tomingaj and later said that 's works had helped him to miraculously recover from his earlier illness. In 1875, Tesla enrolled at in,, on a Military Frontier scholarship.

During his first year, Tesla never missed a lecture, earned the highest grades possible, passed nine exams (nearly twice as many as required ), started a Serb cultural club, and even received a letter of commendation from the dean of the technical faculty to his father, which stated, 'Your son is a star of first rank.' During his second year, Tesla came into conflict with Professor Poeschl over the, when Tesla suggested that commutators were not necessary. Tesla claimed that he worked from 3 a.m. To 11 p.m., no Sundays or holidays excepted.

He was 'mortified when [his] father made light of [those] hard won honors.' After his father's death in 1879, Tesla found a package of letters from his professors to his father, warning that unless he were removed from the school, Tesla would die through overwork.

At the end of his second year, Tesla lost his scholarship and became addicted to gambling. During his third year, Tesla gambled away his allowance and his tuition money, later gambling back his initial losses and returning the balance to his family. Tesla said that he 'conquered [his] passion then and there,' but later in the U.S. He was again known to play.

When examination time came, Tesla was unprepared and asked for an extension to study, but was denied. He did not receive grades for the last semester of the third year and he never graduated from the university. Edison Machine Works on Goerck Street, New York. Tesla found the change from cosmopolitan Europe to working at this shop, located amongst the on Manhattan's lower east side, a 'painful surprise'. In 1884, Edison manager, who had been overseeing the Paris installation, was brought back to the US to manage the, a manufacturing division situated in, and asked that Tesla be brought to the US as well.

In June 1884, Tesla emigrated to the United States. He began working almost immediately at the Machine Works on 's, an overcrowded shop with a workforce of several hundred machinists, laborers, managing staff, and 20 'field engineers' struggling with the task of building the large electric utility in that city. As in Paris, Tesla was working on troubleshooting installations and improving generators.

Bernard Carlson notes Tesla may have met company founder,, only a couple of times. One of those times was noted in Tesla's where, after staying up all night repairing the damaged dynamos on the ocean liner, he ran into Batchelor and Edison who made a quip about their 'Parisian' being out all night. After Tesla told them he had been up all night fixing the Oregon Edison commented to Batchelor that 'this is a damned good man.' One of the projects given to Tesla was to develop an –based street lighting system. Arc lighting was the most popular type of street lighting but it required high voltages and was incompatible with the Edison low voltage incandescent system, causing the company to lose contracts in cities that wanted street lighting as well.

Tesla's designs were never put into production, possibly because of technical improvements in incandescent street lighting or because of an installation deal that Edison cut with an arc lighting company. Tesla had been working at the Machine Works for a total of six months when he quit. What event precipitated him leaving is unclear. It may have been over a bonus he did not receive, either for redesigning generators or for the arc lighting system that was shelved.

Tesla had previous run-ins with the Edison company over unpaid bonuses he believed he had earned. In his own biography, Tesla stated the manager of the Edison Machine Works offered a $50,000 bonus to design 'twenty-four different types of standard machines' 'but it turned out to be a practical joke'. Later versions of this story have Thomas Edison himself offering and then reneging on the deal quipping 'Tesla, you don't understand our American humor.' The size of the bonus in either story has been noted as odd since Machine Works manager Batchelor was stingy with pay and the company did not have that sort of cash (equivalent to $12 million today) on hand. Tesla's diary contains just one comment on what happened at the end of his employment, a note he scrawled across the two pages covering December 7, 1884 to January 4, 1885 saying 'Good by to the Edison Machine Works'.

Tesla Electric Light & Manufacturing Soon after leaving the Edison company, Tesla was working on patenting an arc lighting system, possibly the same one he had developed at Edison. In March 1885, he met with patent attorney Lemuel W. Serrell, the same attorney used by Edison, to obtain help with submitting the patents.

Serrell introduced Tesla to two businessmen, Robert Lane and Benjamin Vail, who agreed to finance an arc lighting manufacturing and utility company in Tesla's name, the. Tesla worked for the rest of the year obtaining the patents that included an improved DC generator, the first patents issued to Tesla in the US, and building and installing the system in Tesla's new system gained notice in the technical press, which commented on its advanced features. The investors showed little interest in Tesla's ideas for new types of motors and electrical transmission equipment. After the utility was up and running in 1886, they decided that the manufacturing side of the business was too competitive and opted to simply run an electric utility. They formed a new utility company, abandoning Tesla's company and leaving the inventor penniless.

Tesla even lost control of the patents he had generated, since he had assigned them to the company in exchange for stock. He had to work at various electrical repair jobs and as a ditch digger for $2 per day. Later in life Tesla would recount that part of 1886 as a time of hardship, writing 'My high education in various branches of science, mechanics and literature seemed to me like a mockery'.

AC and the induction motor. Drawing from, illustrating principle of Tesla's alternating current induction motor In late 1886, Tesla met Alfred S. Brown, a superintendent, and New York attorney Charles F. The two men were experienced in setting up companies and promoting inventions and patents for financial gain.

Based on Tesla's new ideas for electrical equipment, including a idea, they agreed to back the inventor financially and handle his patents. Together they formed the Tesla Electric Company in April 1887, with an agreement that profits from generated patents would go 1/3 to Tesla, 1/3 to Peck and Brown, and 1/3 to fund development. They set up a laboratory for Tesla at 89 Liberty Street in Manhattan, where he worked on improving and developing new types of electric motors, generators, and other devices. In 1887, Tesla developed an that ran on alternating current, a power system format that was rapidly expanding in Europe and the United States because of its advantages in long-distance, transmission. The motor used current, which generated a to turn the motor (a principle that Tesla claimed to have conceived in 1882). This innovative electric motor, patented in May 1888, was a simple self-starting design that did not need a, thus avoiding sparking and the high maintenance of constantly servicing and replacing mechanical brushes.

Along with getting the motor patented, Peck and Brown arranged to get the motor publicized, starting with independent testing to verify it was a functional improvement, followed by press releases sent to technical publications for articles to run concurrent with the issue of the patent. Physicist (who tested the motor) and Electrical World magazine editor arranged for Tesla to demonstrate his alternating current motor on 16 May 1888 at the American Institute of Electrical Engineers.

Engineers working for the reported to that Tesla had a viable AC motor and related power system — something Westinghouse needed for the alternating current system he was already marketing. Westinghouse looked into getting a patent on a similar commutator-less, rotating magnetic field-based induction motor developed in 1885 and presented in a paper in March 1888 by Italian physicist, but decided that Tesla's patent would probably control the market. Nikola Tesla's AC dynamo-electric machine (AC ) in an 1888 In July 1888, Brown and Peck negotiated a licensing deal with George Westinghouse for Tesla's polyphase induction motor and transformer designs for $60,000 in cash and stock and a royalty of $2.50 per AC horsepower produced by each motor. Westinghouse also hired Tesla for one year for the large fee of $2,000 ($53,300 in today's dollars ) per month to be a consultant at the Westinghouse Electric & Manufacturing Company's labs. During that year, Tesla worked in, helping to create an alternating current system to power the city's streetcars.

He found it a frustrating period because of conflicts with the other Westinghouse engineers over how best to implement AC power. Between them, they settled on a 60-cycle AC current system that Tesla proposed (to match the working frequency of Tesla's motor), but they soon found that it would not work for streetcars, since Tesla's induction motor could run only at a constant speed. They ended up using a DC instead. Market turmoil Tesla's demonstration of his induction motor and Westinghouse's subsequent licensing of the patent, both in 1888, came at the time of extreme competition between electric companies. The three big firms, Westinghouse, Edison, and, were trying to grow in a capital intensive business while financially undercutting each other. There was even a ' propaganda campaign going on with Edison Electric trying to claim their system was better and safer than the Westinghouse alternating current system. Competing in this market meant Westinghouse would not have the cash or engineering resources to develop Tesla's motor and the related polyphase system right away.

Two years after signing the Tesla contract, Westinghouse Electric was in trouble. The near collapse of in London triggered the, causing investors to call in their loans to W.E. The sudden cash shortage forced the company to refinance its debts.

The new lenders demanded that Westinghouse cut back on what looked like excessive spending on acquisition of other companies, research, and patents, including the per motor royalty in the Tesla contract. At that point, the Tesla induction motor had been unsuccessful and was stuck in development. Westinghouse was paying a $15,000 a year guaranteed royalty even though operating examples of the motor were rare and polyphase power systems needed to run it were even rarer. In early 1891, George Westinghouse explained his financial difficulties to Tesla in stark terms, saying that, if he did not meet the demands of his lenders, he would no longer be in control of Westinghouse Electric and Tesla would have to 'deal with the bankers' to try to collect future royalties.

The advantages of having Westinghouse continue to champion the motor probably seemed obvious to Tesla and he agreed to release the company from the royalty payment clause in the contract. Six years later Westinghouse would purchase Tesla's patent for a payment of $216,000 as part of a patent sharing agreement signed with (a company created from the 1892 merger of Edison, and Thompson-Houston). New York laboratories.

In Tesla's South Fifth Avenue laboratory, 1894 The money Tesla made from licensing his AC patents made him independently wealthy and gave him the time and funds to pursue his own interests. In 1889, Tesla moved out of the Liberty Street shop Peck and Brown had rented and for the next dozen years would work out of a series of workshop/laboratory spaces in. These included a lab at 175 Grand Street (1889–1892), the fourth floor of 33–35 South (1892–1895), and sixth and seventh floors of 46 & 48 East (1895–1902). Tesla and his hired staff would conduct some of his most significant work in these workshops. Main article: In the summer of 1889, Tesla traveled to the in Paris and learned of ' 1886–88 experiments that proved the existence of, including. Tesla found this new discovery 'refreshing' and decided to explore it more fully. In repeating, and then expanding on, these experiments, Tesla tried powering a with a high speed he had been developing as part of an improved system but found that the high frequency current overheated the iron core and melted the insulation between the primary and secondary windings in the coil.

To fix this problem Tesla came up with his with an air gap instead of insulating material between the primary and secondary windings and an iron core that could be moved to different positions in or out of the coil. Citizenship On 30 July 1891, aged 35, Tesla became a of the United States. In the same year, he patented his. Wireless lighting. Tesla demonstrating wireless lighting by 'electrostatic induction' during an 1891 lecture at via two long (similar to ) in his hands. After 1890, Tesla experimented with transmitting power by inductive and capacitive coupling using high AC voltages generated with his Tesla coil.

He attempted to develop a wireless lighting system based on inductive and capacitive coupling and conducted a series of public demonstrations where he lit and even incandescent light bulbs from across a stage. He would spend most of the decade working on variations of this new form of lighting with the help of various investors but none of the ventures succeeded in making a commercial product out of his findings. In 1893 at, Missouri, the in, Pennsylvania and the, Tesla told onlookers that he was sure a system like his could eventually conduct 'intelligible signals or perhaps even power to any distance without the use of wires' by conducting it through the Earth. Tesla served as a vice-president of the from 1892 to 1894, the forerunner of the modern-day (along with the ).

Steam-powered oscillating generator. Main article: Trying to come up with a better way to generate alternating current, Tesla developed a. He patented it in 1893 and introduced it at the Chicago World's Columbian Exposition that year. Steam would be forced into the oscillator and rush out through a series of ports, pushing a piston up and down that was attached to an armature. The magnetic armature vibrated up and down at high speed, producing an alternating.

This alternating electric current in the wire coils located adjacent. It did away with the complicated parts of a steam engine/generator, but never caught on as a feasible engineering solution to generate electricity. Polyphase System and the Columbian Exposition. A Westinghouse display of the 'Tesla Polyphase System' at Chicago's 1893 Columbian Exposition At the beginning of 1893, Westinghouse engineer had made great progress developing an efficient version of Tesla's induction motor, and Westinghouse Electric started branding their complete AC system as the 'Tesla Polyphase System'. They believed that Tesla's patents gave them over other AC systems. Westinghouse Electric asked Tesla to participate in the 1893 in Chicago where the company had a large space in a building devoted to electrical exhibits. Westinghouse Electric won the bid to light the Exposition with alternating current and it was a key event in the history of AC power, as the company demonstrated to the American public the safety, reliability, and efficiency of a fully integrated alternating current system.

Tesla showed a series of electrical effects related to alternating current as well as his wireless lighting system, using a demonstration he had previously performed throughout America and Europe; these included using high-voltage, high-frequency alternating current to light a wireless. An observer noted: Within the room were suspended two hard-rubber plates covered with tin foil. These were about fifteen feet apart, and served as terminals of the wires leading from the transformers.

When the current was turned on, the lamps or tubes, which had no wires connected to them, but lay on a table between the suspended plates, or which might be held in the hand in almost any part of the room, were made luminous. These were the same experiments and the same apparatus shown by Tesla in London about two years previous, 'where they produced so much wonder and astonishment'. Tesla also explained the principles of the rotating magnetic field in an induction motor by demonstrating how to make a copper egg stand on end, using a device that he constructed known as the and introduced his new steam powered oscillator AC generator. Consulting on Niagara In 1893,, who headed up the, sought Tesla's opinion on what system would be best to transmit power generated at the falls. Over several years, there had been a series of proposals and open competitions on how best to use power generated by the falls. Among the systems proposed by several US and European companies were two-phase and three-phase AC, high-voltage DC, and compressed air. Adams pumped Tesla for information about the current state of all the competing systems.

Tesla advised Adams that a two-phased system would be the most reliable, and that there was a Westinghouse system to light incandescent bulbs using two-phase alternating current. The company awarded a contract to Westinghouse Electric for building a two-phase AC generating system at the Niagara Falls, based on Tesla's advice and Westinghouse's demonstration at the Columbian Exposition that they could build a complete AC system. At the same time, a further contract was awarded to General Electric to build the AC distribution system. The Nikola Tesla Company In 1895, Edward Dean Adams, impressed with what he saw when he toured Tesla's lab, agreed to help found the Nikola Tesla Company, set up to fund, develop, and market a variety of previous Tesla patents and inventions as well as new ones. Alfred Brown signed on, bringing along patents developed under Peck and Brown.

The board was filled out with William Birch Rankine and Charles F. It found few investors; the mid-1890s was a tough time financially, and the wireless lighting and oscillators patents it was set up to market never panned out.

The company would handle Tesla's patents for decades to come. Lab fire In the early morning hours of March 13, 1895, the South Fifth Avenue building that housed Tesla's lab caught fire. It started in the basement of the building and was so intense Tesla's 4th floor lab burned and collapsed into the second floor. The fire not only set back Tesla's ongoing projects, it destroyed a collection of early notes and research material, models, and demonstration pieces, including many that had been exhibited at the 1893 Worlds Colombian Exposition.

Tesla told 'I am in too much grief to talk. What can I say?'

After the fire Tesla moved to 46 & 48 East Houston Street and rebuilt his lab on the 6th and 7th floors. X-ray experimentation. X-ray of a hand, taken by Tesla Starting in 1894, Tesla began investigating what he referred to as radiant energy of 'invisible' kinds after he had noticed damaged film in his laboratory in previous experiments (later identified as ' Roentgen rays' or '). His early experiments were with, a electrical discharge tube. Tesla may have inadvertently captured an X-ray image—predating, by a few weeks, 's December 1895 announcement of the discovery of x-rays—when he tried to photograph Mark Twain illuminated by a, an earlier type of gas discharge tube. The only thing captured in the image was the metal locking screw on the camera lens.

In 1898, Tesla demonstrated a radio-controlled boat which he hoped to sell as a guided torpedo to navies around the world. In March 1896, after hearing of 's discovery of X-ray and X-ray imaging (), Tesla proceeded to do his own experiments in X-ray imaging, developing a high energy single terminal of his own design that had no target electrode and that worked from the output of the Tesla Coil (the modern term for the phenomenon produced by this device is or braking radiation). In his research, Tesla devised several experimental setups to produce X-rays. Tesla held that, with his circuits, the 'instrument will. Enable one to generate Roentgen rays of much greater power than obtainable with ordinary apparatus.' Tesla noted the hazards of working with his circuit and single-node X-ray-producing devices. In his many notes on the early investigation of this phenomenon, he attributed the skin damage to various causes.

He believed early on that damage to the skin was not caused by the Roentgen rays, but by the generated in contact with the skin, and to a lesser extent,. Tesla incorrectly believed that X-rays were longitudinal waves, such as those produced in. These plasma waves can occur in. On 11 July 1934, the published an article on Tesla, in which he recalled an event that would occasionally take place while experimenting with his single-electrode vacuum tubes; a minute particle would break off the cathode, pass out of the tube, and physically strike him: Tesla said he could feel a sharp stinging pain where it entered his body, and again at the place where it passed out. In comparing these particles with the bits of metal projected by his 'electric gun,' Tesla said, 'The particles in the beam of force.

Will travel much faster than such particles. And they will travel in concentrations.' Radio remote control In 1898, Tesla demonstrated a boat that used a -based —which he dubbed 'telautomaton'—to the public during an electrical exhibition.

The crowd that witnessed the demonstration made outrageous claims about the workings of the boat, such as magic, telepathy, and being piloted by a trained monkey hidden inside. Tesla tried to sell his idea to the U.S. Military as a type of radio-controlled, but they showed little interest. Remote remained a novelty until World War I and afterward, when a number of countries used it in. Tesla took the opportunity to further demonstrate 'Teleautomatics' in an address to a meeting of the Commercial Club in, while he was travelling to, on 13 May 1899.

Wireless power. Tesla sitting in front of a spiral coil used in his wireless power experiments at his East Houston St. Laboratory From the 1890s through 1906, Tesla spent a great deal of his time and fortune on a series of projects trying to develop. It was an expansion of his idea of using coils to transmit power he had been demonstrating in wireless lighting. He could see this as not only a way to transmit large amounts of power around the world but also, as he had pointed out in his earlier lectures, a way to transmit worldwide communications. At the time Tesla was formulating his ideas there was no feasible way to wirelessly transmit communication signals over long distances, let alone large amounts of power.

Tesla had studied radio waves early on, at the time called 'Hertzian waves' after their discovery by Hertz, and come to the conclusion that the theory on them was incorrect. Also, this new form of radiation was widely considered at the time to be a short-distance phenomenon that seemed to die out in less than a mile.

Tesla noted that, even if theories on radio waves were true, they were totally worthless for his intended purposes since this form of 'invisible light' would diminish over distance just like any other radiation and would travel in straight lines right out into space becoming 'hopelessly lost'. By the mid 1890s, Tesla was working on the idea that he might be able to conduct electricity long distance through the Earth or the atmosphere and began working on experiments to test this idea including setting up a large resonance transformer in his East Houston Street lab. Seeming to borrow from a common idea at the time that the Earth's atmosphere was conductive, he proposed a system composed of balloons suspending, transmitting, and receiving, electrodes in the air above 30,000 feet (9,100 m) in altitude, where he thought the lower pressure would allow him to send high voltages (millions of volts) long distances. Colorado Springs.

Tesla's Colorado Springs laboratory To further study the conductive nature of low pressure air, Tesla set up an at high altitude in Colorado Springs during 1899. There he could safely operate much larger coils than in the cramped confines of his New York lab and an associate had made an arrangement for the to supply alternating current free of charge. To fund his experiments he convinced to invest $100,000 to become a majority share holder in the Nikola Tesla Company. Astor thought he was primarily investing in the new wireless lighting system. Instead, Tesla used the money to fund his Colorado Springs experiments. Upon his arrival, he told reporters that he planned to conduct experiments, transmitting signals from to Paris. A picture of Tesla sitting next to his ' generating millions of volts.

The 7-metre (23 ft) long arcs were not part of the normal operation, but only produced for effect by rapidly cycling the power switch. There he conducted experiments with a large coil operating in the megavolts range, producing artificial lightning (and thunder) consisting of millions of volts and up to 135 feet (41 m) long discharges and, at one point, inadvertently burned out the generator in El Paso, causing a power outage. The observations he made of the electronic noise of lightning strikes, led him to (incorrectly) conclude that he could use the entire globe of the Earth to conduct electrical energy. During his time at his laboratory Tesla observed unusual signals from his receiver which he speculated to be communications from another planet.

He mentioned them in a letter to a reporter in December 1899 and to the in December 1900 Reporters treated it as a sensational story and jumped to the conclusion Tesla was hearing signals from. He expanded on the signals he heard in a 9 February 1901 Collier's Weekly article 'Talking With Planets' where he said it had not been immediately apparent to him that he was hearing 'intelligently controlled signals' and that the signals could come from Mars,, or other planets. It has been hypothesized that he may have intercepted 's European experiments in July 1899—Marconi may have transmitted the letter S (dot/dot/dot) in a naval demonstration, the same three impulses that Tesla hinted at hearing in Colorado —or signals from another experimenter in wireless transmission.

Tesla had an agreement with the editor of to produce an article on his findings. The magazine sent a photographer to Colorado to photograph the work being done there. The article, titled 'The Problem of Increasing Human Energy', appeared in the June, 1900 edition of the magazine. He explained the superiority of the wireless system he envisioned but the article was more of a lengthy philosophical treatise than an understandable scientific description of his work illustrated with what were to become iconic images of Tesla and his Colorado Springs experiments. Tesla's Wardenclyffe plant on Long Island in 1904. From this facility, Tesla hoped to demonstrate wireless transmission of electrical energy across the Atlantic. Tesla made the rounds in New York trying to find investors for what he thought would be a viable system of wireless transmission, wining and dining them at the 's Palm Garden (the hotel where he was living at the time), and.

In March, 1901, he obtained $150,000 ($4,318,200 in today's dollars ) from in return for a 51% share of any generated wireless patents and began planning the facility to be built in, 100 miles (161 km) east of the city on the North Shore of Long Island. By July 1901, Tesla had expanded his plans to build a more powerful transmitter to leap ahead of Marconi's radio based system, which Tesla thought was a copy of his own system. He approached Morgan to ask for more money to build the larger system but Morgan refused to supply any further funds.

In December 1901, Marconi successfully transmitted the letter S from England to, defeating Tesla in the race to be first to complete such a transmission. A month after Marconi's success Tesla tried to get Morgan to back an even larger plan to transmit messages and power by controlling 'vibrations throughout the globe'. Over the next five years, Tesla wrote more than 50 letters to Morgan, pleading for and demanding additional funding to complete the construction of Wardenclyffe. Tesla continued the project for another nine months into 1902. The tower was erected to its full 187 feet (57 m).

In June 1902, Tesla moved his lab operations from Houston Street to Wardenclyffe. Investors on Wall Street were putting their money into Marconi's system and some in the press began turning against Tesla's project, claiming it was a hoax The project came to a halt in 1905 and in 1906, the financial problems and other events may have led to what Tesla biographer suspects was a nervous breakdown on Tesla's part.

Tesla mortgaged the Wardenclyffe property to cover his debts at the, which eventually mounted to $20,000 ($478,200 in today's dollars ). He lost the property in foreclosure in 1915 and in 1917 the Tower was demolished by the new owner to make the land a more viable real estate asset. Later years After Wardencyiffe closed, Tesla continued to write to Morgan; after 'the great man' died, Tesla wrote to his son Jack Morgan, trying to get further funding for the project. In 1906, he opened offices at 165 Broadway in Manhattan, trying to raise further funds by developing and marketing his patents. He went on to have offices at the from 1910 to 1914; rented for a few months at the, moving out because he could not afford the rent; and then to office space at 8 West 40th Street from 1915 to 1925. After moving to 8 West 40th Street, he was effectively bankrupt. Most of his patents had run out and he was having trouble with the new inventions he was trying to develop.

Bladeless turbine. Tesla's bladeless turbine design On his 50th birthday, in 1906, Tesla demonstrated a 200 horsepower (150 kilowatts) 16,000 rpm. During 1910–1911 at the Waterside Power Station in New York, several of his bladeless turbine engines were tested at 100–5,000 hp. Tesla worked with several companies including the period 1919–1922 working in for. He spent most of his time trying to perfect the Tesla turbine with Hans Dahlstrand, the head engineer at the company, but engineering difficulties meant it was never made into a practical device. Tesla did license the idea to a precision instrument company and it found use in the form of luxury car and other instruments. Wireless lawsuits When broke out, the British cut the transatlantic telegraph cable linking the US to in order to control the flow of information between the two countries.

They also tried to shut off German wireless communication to and from the US by having the US Marconi Company sue the German radio company for patent infringement. Telefunken brought in the physicist and for their defense and hired Tesla as a witness for two years for $1,000 a month. The case stalled and then went moot when the US entered the war against Germany in 1917. In 1915, Tesla attempted to sue the for infringement of his wireless tuning patents. Marconi's initial radio patent had been awarded in the US in 1897, but his 1900 patent submission covering improvements to radio transmission had been rejected several times, before it was finally approved in 1904, on the grounds that it infringed on other existing patents including two 1897 Tesla wireless power tuning patents. Tesla's 1915 case went nowhere, but in a related case, where the Marconi Company tried to sue the US government over WWI patent infringements, a 1943 decision restored the prior patents of,, and Tesla. Second banquet meeting of the Institute of Radio Engineers, 23 April 1915.

Tesla seen standing in the center. Tesla attempted to market several devices based on the production of. These included his 1900 Tesla Ozone Company selling a 1896 patented device based on his Tesla Coil, used to bubble ozone through different types of oils to make a therapeutic gel. He also tried to develop a variation of this a few years later as a room sanitizer for hospitals. Tesla theorized that the application of electricity to the brain enhanced intelligence. In 1912, he crafted 'a plan to make dull students bright by saturating them unconsciously with electricity,' wiring the walls of a schoolroom and, 'saturating [the schoolroom] with infinitesimal electric waves vibrating at high frequency. The whole room will thus, Mr.

Tesla claims, be converted into a health-giving and stimulating electromagnetic field or 'bath.' ' The plan was, at least provisionally, approved by then superintendent of New York City schools, William H. Before, Tesla sought overseas investors. After the war started, Tesla lost the funding he was receiving from his patents in European countries. In the August 1917 edition of the magazine, Tesla postulated that electricity could be used to locate submarines via using the reflection of an 'electric ray' of 'tremendous frequency,' with the signal being viewed on a fluorescent screen (a system that has been noted to have a superficial resemblance to modern ). Tesla was incorrect in his assumption that high frequency radio waves would penetrate water., who helped develop France's first radar system in the 1930s, noted in 1953 that Tesla's general speculation that a very strong high-frequency signal would be needed was correct. Girardeau said, '(Tesla) was prophesying or dreaming, since he had at his disposal no means of carrying them out, but one must add that if he was dreaming, at least he was dreaming correctly.'

In 1928, Tesla received patent,, for a capable of taking off vertically ( aircraft) and then of being ' gradually tilted through manipulation of the elevator devices' in flight until it was flying like a conventional plane. Tesla thought the plane would sell for less than $1,000, although the aircraft has been described as impractical. This would be his last patent and at this time Tesla closed his last office at 350 Madison Ave., which he had moved into two years earlier. Living circumstances Since 1900, Tesla had been living at the Waldorf Astoria in New York running up a large bill. In 1922, he moved to and would follow a pattern from then on of moving to a new hotel every few years leaving behind unpaid bills. Tesla would walk to the park every day to feed the pigeons. He took to feeding them at the window of his hotel room and bringing the injured ones in to nurse back to health.

He said that he had been visited by a specific injured white pigeon daily. Tesla spent over $2,000, including building a device that comfortably supported her so her bones could heal, to fix her broken wing and leg. Tesla stated: I have been feeding pigeons, thousands of them for years. But there was one, a beautiful bird, pure white with light grey tips on its wings; that one was different. It was a female. I had only to wish and call her and she would come flying to me.

I loved that pigeon as a man loves a woman, and she loved me. As long as I had her, there was a purpose to my life. Tesla's unpaid bills, and complaints about the mess from his pigeon-feeding, forced him to leave the St. Regis in 1923, the in 1930, and the in 1934. At one point, he also took rooms at the. In 1934, Tesla moved to the and Westinghouse Electric & Manufacturing Company began paying him $125 per month as well as paying his rent, expenses the Company would pay for the rest of Tesla's life.

Accounts of how this came about vary. Several sources say Westinghouse was worried (or warned) about potential bad publicity surrounding the impoverished conditions under which their former star inventor was living. The payment has been described as being couched as a 'consulting fee' to get around Tesla's aversion to accept charity, or by one biographer (Marc Seifer), as a type of unspecified settlement. Birthday press conferences.

Tesla on commemorating his 75th birthday In 1931, Kenneth Swezey, a young writer who had been associated with Tesla for some time, organized a celebration for the inventor's 75th birthday. Tesla received congratulatory letters from more than 70 pioneers in science and engineering, including Albert Einstein, and he was also featured on the cover of. The cover caption 'All the world's his power house' noted his contribution to. The party went so well Tesla made it an annual event, an occasion where he would put out a large spread of food and drink (featuring dishes of his own creation) and invite the press to see his inventions and hear stories about past exploits, views on current events, or sometimes odd or baffling claims.

Newspaper representation of the thought camera Tesla described at his 1933 birthday party At the 1932 occasion, Tesla claimed he had invented a motor that would run on. In 1933, at age 77, Tesla told reporters that, after thirty-five years of work, he was on the verge of producing proof of a new form of energy. He claimed it was a theory of energy that was “violently opposed” to Einsteinian physics, and could be tapped with an apparatus that would be cheap to run and last 500 years. He also told reporters he was working on a way to transmit individualized private radio wavelengths, working on breakthroughs in metallurgy, and developing a way to photograph the retina to record thought. At the 1934 party, Tesla told reporters he had designed a superweapon he claimed would end all war.

He would call it ', but was usually referred to as his. Tesla described it as a defensive weapon that would be put up along the border of a country to be used against attacking ground-based infantry or aircraft. Tesla never revealed detailed plans of how the weapon worked during his lifetime but in 1984, they surfaced at the archive in. The treatise, The New Art of Projecting Concentrated Non-dispersive Energy through the Natural Media, described an open-ended vacuum tube with a gas jet seal that allows particles to exit, a method of charging slugs of tungsten or mercury to millions of volts, and directing them in streams (through repulsion). Tesla tried to interest the, the United Kingdom, the Soviet Union, and Yugoslavia in the device. In 1935, at his 79th birthday party, Tesla covered many topics. He claimed to have discovered the cosmic ray in 1896 and invented a way to produce direct current by induction, and made many claims about his.

Describing the device (which he expected would earn him $100 million within two years) he told reporters that a version of his oscillator had caused an earthquake in his 46 East Houston Street lab and neighboring streets in downtown New York City in 1898. He went on to tell reporters his oscillator could destroy the with 5 lbs of air pressure. He also explained a new technique he developed using his oscillators he called ', using it to transmit vibrations into the ground that he claimed would work over any distance to be used for communication or locating underground mineral deposits. At his 1937 celebration in the Grand Ballroom of Hotel New Yorker, Tesla received the 'Order of the White Lion' from the Czechoslovakia ambassador and a medal from the Yugoslavian ambassador. On questions concerning the death ray, Tesla stated, 'But it is not an experiment.

I have built, demonstrated and used it. Only a little time will pass before I can give it to the world.'

In the fall of 1937, after midnight one night, Tesla left the Hotel New Yorker to make his regular commute to the cathedral and the library to feed the pigeons. While crossing a street a couple of blocks from the hotel, Tesla was unable to dodge a moving taxicab and was thrown to the ground. His back was severely wrenched and three of his ribs were broken in the accident.

The full extent of his injuries were never known; Tesla refused to consult a doctor, an almost lifelong custom, and never fully recovered. Main article: Tesla obtained around 300 patents worldwide for his inventions.

Some of Tesla's patents are not accounted for, and various sources have discovered some that have lain hidden in patent archives. There are a minimum of 278 known patents issued to Tesla in 26 countries. Many of Tesla's patents were in the United States,, and, but many other patents were approved in countries around the globe. Many inventions developed by Tesla were not put into patent protection.

Personal life Tesla worked every day from 9:00 a.m. Until 6:00 p.m. Or later, with dinner from exactly 8:10 p.m., at restaurant and later the. Tesla would telephone his dinner order to the headwaiter, who also could be the only one to serve him. 'The meal was required to be ready at eight o'clock. He dined alone, except on the rare occasions when he would give a dinner to a group to meet his social obligations.

Tesla would then resume his work, often until 3:00 a.m.' For exercise, Tesla walked between 8 and 10 miles (13 and 16 km) per day. He curled his toes one hundred times for each foot every night, saying that it stimulated his brain cells.

In an interview with newspaper editor, Tesla said that he did not believe in telepathy, stating, 'Suppose I made up my mind to murder you,' he said, 'In a second you would know it. Now, isn't that wonderful?

By what process does the mind get at all this?' In the same interview, Tesla said that he believed that all fundamental laws could be reduced to one. Tesla became a vegetarian in his later years, living on only milk, bread, honey, and vegetable juices. Tesla, aged 34, circa 1890. Photo by Tesla was 6 feet 2 inches (1.88 m) tall and weighed 142 pounds (64 kg), with almost no weight variance from 1888 to about 1926. His appearance was described by newspaper editor as 'almost the tallest, almost the thinnest and certainly the most serious man who goes to Delmonico's regularly'. He was an elegant, stylish figure in New York City, meticulous in his grooming, clothing, and regimented in his daily activities, an appearance he maintained as to further his business relationships.

He was also described as having light eyes, 'very big hands', and 'remarkably big' thumbs. Eidetic memory Tesla read many works, memorizing complete books, and supposedly possessed a. He was a, speaking eight languages: Serbo-Croatian, Czech, English, French, German, Hungarian, Italian, and Latin. Tesla related in his autobiography that he experienced detailed moments of inspiration. During his early life, Tesla was repeatedly stricken with illness. He suffered a peculiar affliction in which blinding flashes of light would appear before his eyes, often accompanied by visions. Often, the visions were linked to a word or idea he might have come across; at other times they would provide the solution to a particular problem he had encountered.

Just by hearing the name of an item, he would be able to envision it in realistic detail. Tesla would visualize an invention in his mind with extreme precision, including all dimensions, before moving to the construction stage, a technique sometimes known as. He typically did not make drawings by hand but worked from memory. Beginning in his childhood, Tesla had frequent flashbacks to events that had happened previously in his life. Sleep habits Tesla claimed never to sleep more than two hours per night. However, he did admit to 'dozing' from time to time 'to recharge his batteries.' During his second year of study at Graz, Tesla developed a passionate proficiency for billiards,, and, sometimes spending more than 48 hours in a stretch at a gaming table.

On one occasion at his laboratory, Tesla worked for a period of 84 hours without rest. Kenneth Swezey, a journalist whom Tesla had befriended, confirmed that Tesla rarely slept.

Swezey recalled one morning when Tesla called him at 3 a.m.: 'I was sleeping in my room like one dead. Suddenly, the telephone ring awakened me. Joomla Templates Club.

[Tesla] spoke animatedly, with pauses, [as he]. Work[ed] out a problem, comparing one theory to another, commenting; and when he felt he had arrived at the solution, he suddenly closed the telephone.' Relationships Tesla never married, explaining that his chastity was very helpful to his scientific abilities. He once said in earlier years that he felt he could never be worthy enough for a woman, considering women superior in every way. His opinion had started to sway in later years when he felt that women were trying to outdo men and make themselves more dominant. This 'new woman' was met with much indignation from Tesla, who felt that women were losing their femininity by trying to be in power. In an interview with the Galveston Daily News on 10 August 1924 he stated, 'In place of the soft voiced, gentle woman of my reverent worship, has come the woman who thinks that her chief success in life lies in making herself as much as possible like man—in dress, voice and actions, in sports and achievements of every kind.

The tendency of women to push aside man, supplanting the old spirit of cooperation with him in all the affairs of life, is very disappointing to me'. Although he told a reporter in later years that he sometimes felt that by not marrying, he had made too great a sacrifice to his work, Tesla chose to never pursue or engage in any known relationships, instead finding all the stimulation he needed in his work. Tesla was asocial and prone to seclude himself with his work. However, when he did engage in a social life, many people spoke very positively and admiringly of Tesla. Described him as attaining a 'distinguished sweetness, sincerity, modesty, refinement, generosity, and force.' His secretary, Dorothy Skerrit, wrote: 'his genial smile and nobility of bearing always denoted the gentlemanly characteristics that were so ingrained in his soul.' Tesla's friend,, wrote, 'seldom did one meet a scientist or engineer who was also a poet, a philosopher, an appreciator of fine music, a linguist, and a connoisseur of food and drink.'

Tesla was a good friend of, Robert Underwood Johnson,, Fritz Lowenstein, George Scherff, and Kenneth Swezey. In middle age, Tesla became a close friend of; they spent a lot of time together in his lab and elsewhere. Twain notably described Tesla's invention as 'the most valuable patent since the telephone.'

In the late 1920s, Tesla befriended, a poet, writer, mystic, and later, a propagandist. Tesla occasionally attended dinner parties held by Viereck and his wife. Tesla could be harsh at times and openly expressed disgust for overweight people, such as when he fired a secretary because of her weight. He was quick to criticize clothing; on several occasions, Tesla directed a subordinate to go home and change her dress.

When died, in 1931, Tesla contributed the only negative opinion to, buried in an extensive coverage of Edison's life: He had no hobby, cared for no sort of amusement of any kind and lived in utter disregard of the most elementary rules of hygiene. His method was inefficient in the extreme, for an immense ground had to be covered to get anything at all unless blind chance intervened and, at first, I was almost a sorry witness of his doings, knowing that just a little theory and calculation would have saved him 90 percent of the labor. But he had a veritable contempt for book learning and mathematical knowledge, trusting himself entirely to his inventor's instinct and practical American sense. Beliefs On experimental and theoretical physics Tesla exhibited a pre-atomic understanding of physics in his writings; he disagreed with the theory of atoms being composed of smaller, stating there was no such thing as an creating an electric charge. He believed that if electrons existed at all, they were some fourth state of matter or 'sub-atom' that could exist only in an experimental vacuum and that they had nothing to do with electricity. Tesla believed that atoms are immutable—they could not change state or be split in any way.

He was a believer in the 19th century concept of an all-pervasive ' that transmitted electrical energy. Tesla was generally antagonistic towards theories about the conversion of matter into energy. He was also critical of Einstein's, saying: I hold that space cannot be curved, for the simple reason that it can have no properties.

It might as well be said that God has properties. He has not, but only attributes and these are of our own making. Of properties we can only speak when dealing with matter filling the space.

To say that in the presence of large bodies space becomes curved is equivalent to stating that something can act upon nothing. I, for one, refuse to subscribe to such a view. Tesla claimed to have developed his own physical principle regarding matter and energy that he started working on in 1892, and in 1937, at age 81, claimed in a letter to have completed a 'dynamic theory of gravity' that '[would] put an end to idle speculations and false conceptions, as that of curved space.' He stated that the theory was 'worked out in all details' and that he hoped to soon give it to the world. Further elucidation of his theory was never found in his writings.

Tesla circa 1885 Tesla is widely considered by his biographers to have been a in philosophical outlook on top of his gifts as a technological. This did not preclude Tesla, like many of his era, becoming a proponent of an imposed version of. Tesla expressed the belief that human 'pity' had come to interfere with the natural 'ruthless workings of nature.' Though his argumentation did not depend on a concept of a 'master race' or the inherent superiority of one person over another, his advocacy of eugenics led him to adopt more extreme views. In a 1937 interview he stated. man's new sense of pity began to interfere with the ruthless workings of nature. The only method compatible with our notions of civilization and the race is to prevent the breeding of the unfit by sterilization and the deliberate guidance of the mating instinct. The trend of opinion among eugenists is that we must make marriage more difficult.

Certainly no one who is not a desirable parent should be permitted to produce progeny. A century from now it will no more occur to a normal person to mate with a person eugenically unfit than to marry a habitual criminal. In 1926, Tesla commented on the ills of the social subservience of women and the struggle of women toward, and indicated that humanity's future would be run by '.'

He believed that women would become the dominant sex in the future. Tesla made predictions about the relevant issues of a post-World War I environment in a printed article, 'Science and Discovery are the great Forces which will lead to the Consummation of the War' (20 December 1914). Tesla believed that the was not a remedy for the times and issues. On religion Tesla was raised an. Later in life he did not consider himself to be a 'believer in the orthodox sense,' said he opposed, and said 'Buddhism and Christianity are the greatest religions both in number of disciples and in importance'. He also said 'To me, the universe is simply a great machine which never came into being and never will end' and 'what we call 'soul' or 'spirit,' is nothing more than the sum of the functionings of the body. When this functioning ceases, the 'soul' or the 'spirit' ceases likewise'.

Literary works Tesla wrote a number of books and articles for magazines and journals. Among his books are, compiled and edited by Ben Johnston;, compiled and edited by; and The Tesla Papers. Many of Tesla's writings are freely available online, including the article 'The Problem of Increasing Human Energy,' published in in 1900, and the article 'Experiments With Alternate Currents Of High Potential And High Frequency,' published in his book Inventions, Researches and Writings of Nikola Tesla. Legacy and honors. • Burgan, Michael (2009)..

Mankato, Minnesota:.. • Carlson, W.

Bernard (2013).... • Cheney, Margaret (2011).. Simon & Schuster.. • Cheney, Margaret (2001) [1981].... • Cheney, Margaret; Uth, Robert; Glenn, Jim (1999)....

• Childress, David (1993).... • Dommermuth-Costa, Carol (1994).... • Jonnes, Jill (2004)..

Trade Paperbacks.. • Klooster, John W. • O'Neill, John J. Ives Washburn..

(reprinted 2007 by Book Tree, ) • Pickover, Clifford A. • Seifer, Marc J. • Seifer, Marc J. • Van Riper, A. Winchester 94 Serial Numbers on this page.

Bowdoin (2011).. Scarecrow Press.. Further reading about Nikola Tesla • • By Nikola Tesla • • Books. • Tesla, Nikola,, Parts I through V published in the Electrical Experimenter monthly magazine from February through June 1919. Part VI published October 1919. Reprint edition with introductory notes by Ben Johnson, New York: Barnes and Noble, 1982; also online at, as, 1919. • Glenn, Jim (1994).

The Complete Patents of Nikola Tesla. • (1999).: Nikola Tesla, forgotten genius of electricity. London: Headline. • (1894 (1996 reprint)),, Montana: Kessinger.

• McNichol, Tom (2006). AC/DC The Savage Tale of the First Standards War, Jossey-Bass. David (2003). In Search of Nikola Tesla (Revised ed.). Bath: Ashgrove.. • Trinkaus, George (2002). Tesla: The Lost Inventions, High Voltage Press.

• Valone, Thomas (2002). Harnessing the Wheelwork of Nature: Tesla's Science of Energy.