World Wireless System
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The World Wireless System was a turn of the 19th century proposed telecommunications and electrical power delivery system designed by inventor Nikola Tesla based on his theories of using Earth and its atmosphere as electrical conductors. Tesla claimed this system would allow for "the transmission of electric energy without wires" on a global scale as well as point-to-point wireless telecommunications and broadcasting. He made public statements citing two related methods to accomplish this from the mid-1890s on. By the end of 1900 Tesla had convinced banker J. P. Morgan to finance construction of a wireless station (eventually sited at Wardenclyffe) based on his ideas intended to transmit messages across the Atlantic to England and to ships at sea. Almost as soon as the contract was signed Tesla decided to scale up the facility to include his ideas of terrestrial wireless power transmission to better compete with Guglielmo Marconi's radio based telegraph system. Morgan refused to fund the changes and, when no additional investment capital became available, the project at Wardenclyffe was abandoned in 1906, never to become operational.
During this period Tesla filed numerous patents associated with the basic functions of his system, including transformer design, transmission methods, tuning circuits, and methods of signaling. He also described a plan to have some thirty Wardenclyffe-style telecommunications stations positioned around the world to be tied into existing telephone and telegraph systems. Tesla would continue to elaborate to the press and in his writings for the next few decades on the system's capabilities and how it was superior to radio-based systems.
Despite Tesla's claims that he had "carried on practical experiments in wireless transmission" there is no documentation he ever transmitted power beyond relatively short distances, and modern scientific opinion is generally that his wireless power scheme would not have worked.
Tesla's idea's for a world wireless system grew out of experiments beginning in the early 1890s after learning of Hertz's experiments with electromagnetic waves using induction coil transformers and spark gaps. He duplicated those experiments and then went on to improve Hertz's wireless transmitter, developing various alternator apparatus and his own high tension transformer, known as the Tesla coil. Tesla's primary interest in wireless phenomenon was as a power distribution system, early on pursuing wireless lighting. From 1891 on Tesla was delivering lectures including "Experiments with Alternate Currents of High Potential and High Frequency" in 1892 in London and in Paris and went on to demonstrate "wireless lighting" in 1893 including lighting Geissler tubes wirelessly.
The first experiment was the operation of light and motive devices connected by a single wire to one terminal of a high frequency induction coil, performed during the 1891 New York City lecture at Columbia College. While a single terminal incandescent lamp connected to one of an induction coil’s secondary terminals does not form a closed circuit "in the ordinary acceptance of the term" the circuit is closed in the sense that a return path is established back to the secondary by capacitive coupling or 'displacement current'. This is due to the lamp’s filament or refractory button capacitance relative to the coil’s free terminal and environment; the free terminal also has capacitance relative to the lamp and environment.
The second result demonstrated how energy can be made to go through space without any connecting wires. The wireless energy transmission effect involves the creation of an electric field between two metal plates, each being connected to one terminal of an induction coil’s secondary winding. A gas discharge tube was used as a means of detecting the presence of the transmitted energy. Some demonstrations involved lighting of two partially evacuated tubes in an alternating electrostatic field while held in the hand of the experimenter.
At the time Tesla was formulating his theories in the early 1890s he discarded the idea of using radio waves. Not only did he not believe they existed as theorized, he agreed with what most physicists were saying at the time: that they would travel in a straight line propagation similar to light, making them useful for only short range communication. (This was many years before the discovery that there was an ionosphere that would reflect radio waves making long range communication possible.)
Tesla theorized that transmitting electrical signals any distance would have to use the planet Earth or some other medium to overcome this limitation. By the end of 1895 he was making statements to the press on the possibility that "earth's electrical charge can be disturbed, and thereby electrical waves can be efficiently transmitted to any distance without the use of cables or wires" to transmit "intelligible signals" and "motive power". In April 11, 1896 Tesla made another statement that he believed, "messages might be conducted to all parts of the globe simultaneously" using electric waves "propagated through the atmosphere and even the ether beyond". In September 1897 he applied for a patent on a wireless power transmission scheme consisting of transmitting power between two tethered balloons maintained at 30,000 feet, an altitude where he thought a conductive layer should exist.
Between 1895 - 1898 Tesla constructed a large resonance transformer in his New York City lab called a magnifying transmitter to test his earth conduction theories. In 1899 he conducted large scale experiments at Colorado Springs, Colorado. From his measurements there he concluded the Earth was "literally alive with electrical vibrations." He noted that lightning strikes seemed to show the Earth was indeed a big conductor with the waves of energy from each strike going from one side of the Earth to the other. At Colorado Springs he also constructed a large magnifying transmitter measuring fifty-one feet (15.5 m) in diameter which could develop a working potential estimated at 3.5 million to 4 million volts and was capable of producing electrical discharges exceeding one hundred feet (30 m) in length. With it he tested earth conduction and lit un-connected electric lights outside his lab in demonstrations of wireless power transmission at relatively short ranges.
After Tesla returned to New York City from Colorado Springs in 1900 he sought venture capitalists to fund what he thought was revolutionary wireless communication and electric power delivery system using the Earth as the conductor. At the end of 1900 he gained the attention of financier J. P. Morgan who agreed to fund a pilot project (later to become the Wardenclyffe project) which, based on Tesla's theories, would be capable of transmitting messages, telephony, and even facsimile images across the Atlantic to England and to ships at sea. Morgan was to receive a controlling share in the company as well as half of all the patent income. Tesla's decision in July 1901 to include his ideas of wireless power transmission to better compete with Guglielmo Marconi's new radio based telegraph system was met with Morgan's refusal to fund the changes.
Construction of the Wardenclyffe "wireless plant" in Shoreham started towards the end of 1901 and continued for the next 3 years. The plant included a Stanford White designed 94 by 94 ft (29 by 29 m) brick building, a wood-framed tower 186 feet (57 m) tall with a 68 feet (21 m) in diameter "cupola" on top, and a 120 feet (37 m) shaft sunk into the ground with sixteen iron pipes driven "one length after another" 300 feet (94.4 m) below the shaft in order for the machine, in Tesla's words, "to have a grip on the earth so the whole of this globe can quiver." Funding problems continued to plague Wardenclyffe and by 1905-1906 most of the site's activity had to be shut down.
Through the latter part of the 1890s and during the construction of Wardenclyffe, Tesla applied for patents covering the many elements that would make up his wireless system. The system Tesla came up with was based on electrical conduction with an electrical charge being conducted through the ground and being returned through the air. It consisted of a grounded Tesla coil as a resonance transformer transmitter that he theorized would be able to create a displacement of Earth's electric charge by alternately charging and discharging the oscillator's elevated terminal. This would work in conjunction with a second Tesla coil used in receive mode at a distant location, also with a grounded helical resonator and an elevated terminal. Tesla believed that the placement of a grounded resonance transformer at another point on the Earths surface in the roll of a receiver tuned to the same frequency as the transmitter would allow electric current flowing through the Earth between the two. He also believed waves of electric current from the sending tower would reflect back from the far side of the globe, resulting in amplified stationary waves of electric current that he could direct to any point on the globe, localizing power delivery directly to the receiving station. The other part of his system was electricity returned via "an equivalent electric displacement"" in the atmosphere via a charged conductive upper layer that Tesla thought existed, a theory dating back to an 1872 idea for a proposed wireless power system by Mahlon Loomis. The current could be used at the receiver to drive electrical devices.
Tesla told a friend his plans included the building of more than thirty transmission-reception stations constructed near major population centers around the world with Wardenclyffe being the first. If plans had moved forward without interruption the Long Island prototype would have been followed by a second plant built in the British Isles, perhaps on the west coast of Scotland near Glasgow. Each of these facilities was to include a large magnifying transmitter of a design loosely based upon the apparatus assembled at the Colorado Springs experimental station in 1899.
Tesla description of his wireless transmission ideas in 1895 include its humanitarian uses in bringing abundant electrical energy to remote underdeveloped parts of the world and fostering closer communications amongst nations. His June, 1900 Century Magazine article "The Problem of Increasing Human Energy" includes photographs of his Colorado Springs experiments and his thoughts on how Hertz experiments were not "an experimental verification of the poetical conceptions of Maxwell." He elaborated on his system of using Earth as the medium for communication and power delivery. He wrote how he could set up communications at any distance. He noted his system could localize electrical delivery to a point on the globe via stationary waves. He also noted this same process could be used to locate maritime objects such as icebergs or ships at sea.
In 1909 Tesla stated:
- "It will soon be possible, for instance, for a business man in New York to dictate instructions and have them appear instantly in type in London or elsewhere. He will be able to call up from his desk and talk with any telephone subscriber in the world. It will only be necessary to carry an inexpensive instrument not bigger than a watch, which will enable its bearer to hear anywhere on sea or land for distances of thousands of miles. One may listen or transmit speech or song to the uttermost parts of the world."
Tesla also believed that high potential electric current flowing through the upper atmosphere could make it glow, providing night time lighting for transoceanic shipping lanes.
Tesla elaborated on his world wireless system in his 1919 Electrical Experimenter article titled "The True Wireless," detailing its ability for long range telecommunications and putting forward his view that the prevailing theory of radio wave propagation was inaccurate.
- "The Hertz wave theory of wireless transmission may be kept up for a while, but I do not hesitate to say that in a short time it will be recognized as one of the most remarkable and inexplicable aberrations of the scientific mind which has ever been recorded in history."
Tesla demonstrated wireless power transmission at Colorado Springs, lighting incandescent electric lamps positioned relatively close to the structure housing his large experimental magnifying transmitter and claimed afterwards that he had, "carried on practical experiments in wireless transmission." He believed that he had achieved Earth electrical resonance at Colorado Springs that, according to his theory, would produce electrical effects at any terrestrial distance.
There is no documented evidence Tesla ever transmitted significant power beyond those short-range demonstrations adjacent to the transmitter, perhaps 300 feet (91 m). The writer Marc Seifer noted opinion amongst Tesla proponents that ranged from the idea not being practicable to claims some of Tesla's observations were valid. Other investigators note that Tesla over estimated the conductivity of the Earth and the atmosphere and vastly underestimated the loss of power over distance. There is also little evidence that Tesla achieved wireless communication over significant distances. The only report of long distance communication by Tesla, from a legal statement he made in 1916, is that in 1899 he transmitted a signals over a distance of about 10 miles (16 km).
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- Wireless energy transmission
- Surface plasmon
- Surface-wave-sustained mode
- Transmission medium
- Distributed generation
- Electricity distribution
- Electric power transmission
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