It is possible that Nikola Tesla is best known for his remarkable statements regarding the wireless transmission of electrical power. His first efforts towards this end started in 1891 and were intended to simply "disturb the electrical equilibrium in the nearby portions of the earth... to bring into operation in any way some instrument." In other words the object of his experiments was simply to produce effects locally and detect them at a distance.
By 1899 the electrical potential of his transmitter had increased to the point that more room was needed for the sake of safety. This and other considerations led him to temporarily shift his wireless experiments to a location just outside of Colorado Springs. At this Colorado "Experimental Station" Tesla had some early success in wireless power transmission. One photograph shows that a small incandescent lamp was lighted by means of a resonant circuit grounded on one end, all the energy being drawn through the earth (from a nearby transmitter). In 1907, Tesla even went as far as to make this statement: "... to make the little filament glow, the entire surface of the planet, two hundred million square miles, must be strongly electrified. This calls for peculiar electrical activities, hundreds of times greater than those involved in the lighting of an arc lamp through the human body" (a far more spectacular demonstration). What impresses him most, however, is the knowledge that "the little lamp will spring into the same brilliancy anywhere on the globe, there being no appreciable diminution of the effect with the increase of distance from the transmitter"
It is not at all clear that Tesla was referring to effects produced by his large Colorado transmitter. It is quite possible that he was writing about what could be done with an even bigger transmitter such as the one that he was developing in New York. If the Wardenclyffe communications facility had been finished, the 187 foot tall mushroom-shaped tower would have permanently housed a set of large coils including an immense helical resonator that would have served as the main transmitting element. Directly below the wooden tower there was a 120 foot shaft where deep underground Tesla had installed a radial array of iron pipes that served as a connection between the oscillator and the earth.
The Wardenclyffe plant was a major milestone in Tesla's researches into the application of alternating electrical currents to wireless communications and power transmission, an effort which drew a considerable amount of Tesla's attention during the period between 1891 and 1912.
In the article "The Future of the Wireless Art" which appeared in Wireless Telegraphy & Telephony, 1908, Tesla made the following statement regarding the Wardenclyffe project on which he was then working: "As soon as completed, it will be possible for a business man in New York to dictate instructions, and have them instantly appear in type at his office in London or elsewhere. He will be able to call up, from his desk, and talk to any telephone subscriber on the globe, without any change whatever in the existing equipment. An inexpensive instrument, not bigger than a watch, will enable its bearer to hear anywhere, on sea or land, music or song, the speech of a political leader, the address of an eminent man of science, or the sermon of an eloquent clergyman, delivered in some other place, however distant."
Tesla continued, "In the same manner any picture, character, drawing, or print can be transferred from one to another place. Millions of such instruments can be operated from but one plant of this kind. More important than this, however, will be the transmission of power, without wires, which will be shown on a scale large enough to carry conviction. These few indications will be sufficient to show that the wireless art offers greater possibilities than any invention or discovery heretofore made, and if the conditions are favorable, we can expect with certitude that in the next few years wonders will be wrought by its application."
In the end, Tesla was never able to complete the Wardenclyffe plant, although he was able to conduct some performance tests. Nevertheless, if the above stated predictions were to be true, an interesting feature of Tesla's World System for global communications, had it gone into full operation, would have been its capacity to provide small but usable quantities of electrical power at the location of the receiving circuits.
Wardenclyffe - The Creation Of A Monument To Nikola Tesla
The year was 1900 and following 9 productive months of wireless propagation research in Colorado, Nikola Tesla was anxious to put a mass of new found knowledge to work. His vision focused on the development of a prototype wireless communications station and research facility and he needed a site on which to build. In 1901 he cast his eyes some 60 miles eastward to the north shore village of Woodville Landing. Only six years before the north branch of the Long Island Railroad had opened, reducing travel time to the locality from a horse drawn five hours to less than two. Seeing an opportunity in land development a western lawyer and banker by the name of James S. Warden had purchased 1400 acres in the area and started building an exclusive summer resort community known as Wardenclyffe-On-Sound.
With an opportunity for further development in mind, Warden offered Tesla a 200 acre section of this parcel lying directly to the south of the newly laid track. It was anticipated that implementation of Tesla's system would eventually lead to the establishment of a "Radio City" to house the thousands of employees needed for operation of the facility. The proximity to Manhattan and the fairly short travel time between the two, along with the site's closeness to a railway line must surely have been attractive features and Tesla accepted the offer.
The Wardenclyffe World Wireless facility as envisioned by Tesla was to have been quite different from present day radio broadcasting stations. While there was to be a great similarity in the apparatus employed, the method in which it was to be utilized would have been radically different. Conventional transmitters are designed so as to maximize the amount of power radiated from the antenna structure. Such equipment must process tremendous amounts of power in order to counteract the loss in field strength encountered as the signal radiates out from its point of origin. The transmitter at Wardenclyffe was being configured so as to minimize the radiated power.
The energy of Tesla's steam driven Westinghouse 200 kW alternator was to be channeled instead into an extensive underground radial structure of iron pipe installed 120 feet beneath the tower's base.
This was to be accomplished by superposing a low frequency baseband signal on the higher frequency signal coursing through the transmitter's helical resonator.
The low frequency current in the presence of an enveloping corona-induced plasma of free charge carriers would have pumped the earth's charge. It is believed the resulting ground current and its associated wave complex would have allowed the propagation of wireless transmissions to any distance on the earth's surface with as little as 5% loss due to radiation. The terrestrial transmission line modes so excited would have supported a system with the following technical capabilities:
1.) Establishment of a multi-channel global broadcasting system with programming including news, music, etc;
2.) Interconnection of the world's telephone and telegraph exchanges, and stock tickers;3.) Transmission of written and printed matter, and data;
4.) World wide reproduction of photographic images;5.) Establishment of a universal marine navigation and location system, including a means for the synchronization of precision timepieces;
6.) Establishment of secure wireless communications services.The plan was to build the first of many installations to be located near major population centers around the world. If the program had moved forward without interruption, the Long Island prototype would have been followed by additional units the first of which being built somewhere along the coast of England. By the Summer of 1902 Tesla had shifted his laboratory operations from the Houston Street Laboratory to the rural Long Island setting and work began in earnest on development of the station and furthering of the propagation research. Construction had been made possible largely through the backing of financier J. Pierpont Morgan who had offered Tesla $150,000 towards the end of 1900.
By July 1904, however, this support had run out and with a subsequent major down turn in the financial markets Tesla was compelled to pursue alternative methods of financing. With funds raised through an unrecorded mortgage against the property, additional venture capital, and the sale of X-ray tube power supplies to the medical profession he was able to make ends meet for another couple of years. In spite of valiant efforts to maintain the operation, income dwindled and his employees were eventually dropped from the payroll.
Still, Tesla was certain that his wireless system would yield handsome rewards if it could only be set into operation and so the work continued as he was able. A second mortgage in 1908 acquired again from the Waldorf-Astoria proprietor George C. Boldt allowed some additional bills to be paid, but debt continued to mount and between 1912 and 1915 Tesla's financial condition disintegrated. The loss of ability to make additional payments was accompanied by the collapse of his plan for high capacity trans-Atlantic wireless communications.
The property was foreclosed, Nikola Tesla honored the agreement with his debtor and title on the property was signed over to Mr. Boldt. The plant's abandonment sometime around 1911-1912 followed by demolition and salvaging of the tower in 1917 essentially brought an end to this era. Tesla's April 20, 1922 loss on appeal of the judgment completely closed the door to any further chance of his developing the site. Tesla had predicted that further advances would have permitted the wireless transmission of industrial amounts of electrical energy with minimal losses to any point on the earth's surface. Had he been able to complete the prototype station on Long Island and use it to demonstrate the feasibility of wireless power transmission then a plan would have been implemented for the construction of a pilot plant for this larger system at Niagara Falls, site of the world's first commercial three phase AC power plant.
