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The device had a magnet which gave off intense magnetic fields up to 20,000 lines per centimeter. The radio device clearly establishes his piority in the discovery of radio.
The shipboard quench-spark transmitter produced by the Lowenstein Radio Company and licensed under Nikola Tesla Company patents, was installed on the U.S. Naval vessels prior to World War I.
In December 1901, Marconi established wireless communication between Britain and the Newfound-land, Canada, earning him the Nobel prize in 1909. But much of Marconi’s work was not original.
In 1864, James Maxwell theorized electromagnetic waves. In 1887, Heinrich Hertz proved Maxwell’s theories. Later, Sir Oliver Logde extended the Hertz prototype system. The Brandley coherer increased the distance messages could be transmitted. The coherer was perfected by Marconi.
However, the heart of radio transmission is based upon four tuned circuits for transmitting and receiving. It is Tesla’s original concept demonstrated in his famous lecture at the Franklin Institute in Philadelphia in 1893. The four circuits, used in two pairs, are still a fundamental part of all radio and television equipment.
The United States Supreme Court, in 1943 held Marconi’s most important patent invalid, recognizing Tesla’s more significant contribution as the inventor of radio technology.
Tesla built an experimental station in Colorado Springs, Colorado in 1899, to experiment with high voltage, high frequency electricity and other
phenomena.
When the Colorado Springs Tesla Coil magnifying transmitter was energized, it created sparks 30 feet long. From the outside antenna, these sparks could be seen from a distance of ten miles. From this laboratory, Tesla generated and sent out wireless waves which mediated energy, without wires for miles. In Colorado Springs, where he stayed from May 1899 until 1900, Tesla made what he regarded as his most important discovery: terrestrial stationary waves.
By this discovery he proved that the Earth could be used as a conductor and would be as responsive as a tuning fork to electrical vibrations of a certain frequency. He also lighted 200 lamps without wires from a distance of 25 miles
(40 kilometers) and created man-made lightning. At one time he was certain he had received signals from another planet in his Colorado laboratory, a claim that was met with disbelief in some scientific journals.
The old Waldorf Astoria was the residence of Nikola Tesla for many years. He lived there when he was at the height of financial and intellectual power.  Tesla  organized elaborate dinners, inviting famous people who later
witnessed spectacular electrical experiments in his laboratory.