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NEWSCIENCENEWSCIENCENEWSCIENCE that we erect on a vessel a large rectangular running the ship first in one direction and Wonderful were the results obtained, both helice or inductance coil of insulated wire. then in another, and noting whether the those anticipated as well as those Actual experiments in my laboratory at reactance effect caused by the presence of unexpected. As an example of what has Houston Street (New York City) have _ the submarine hull increased or decreased. been done with several hundred kilowatts proven that the presence of a local iron The radiating inductance must be very _ of high frequency energy liberated, it was mass such as the ship's hull would not _ sharply attuned to the measuring apparatus found that the dynamos in a power house interfere with the action of this device. installed on the ship, when no trouble will six miles away were repeatedly burned out, "To this coil of wire, measuring perhaps be found in detecting the presence of such due to the powerful high-frequency 400 feet in length by 70 feet in width, the a large metallic mass as a submarine, even currents set up in them and which caused breadth of the ship, we connect a source of at a distance of five to six miles; of this I heavy sparks to jump through the windings extremely high frequency and very and destroy the insulation! powerful oscillating current. By this "The lightning arresters in the power means there are radiated powerful "| could walk on the sand house showed a stream of blue-white oscillating electro-static currents, . . . sparks passing between the metal which as I have found by actual (ordinarily considered a plates to the earth connection. I could exer i'm Cola exssone | ery good insulator) several lk on the sand, Corina body (such as a submarine hull, even hundred feet from my large several hundred feet from my large though made of brass or any other inh. H high-frequency oscillator, and sparks metal) and in turn cause that mass to high frequency oscillator, jumped from my shoes! At such react inductively on the exciting coil and sparks jumped from distances all incandescent lamps on the ship. To locate an iron mass, it my shoes!" glowed by wireless power,** and is not necessary to excite the coil with a high frequency current; the critical turns of wire arranged in a coil on the balance of the coil will be affected ground, were lighted to full brilliancy. simply by the presence of the magnetic _ feel confident from my past experiments in The effect on metallic objects at banks of lamp, connected to a few body. the realm of ultra-high frequency currents considerable distances was really "To be able to accurately determine the and potentials." remarkable." direction and range of the enemy I asked him about the "Ulivi ray", which submarine, four exciting inductances Back to the Colorado Tests was accorded considerable newspaper should be used.* With a single "What particular experiments do you __ publicity some time ago. inductance, however, it would be possible _ have in mind, Dr Tesla?" I asked. "The ‘Ulivi ray' really was transplanted to determine the location of a submarine by "The Colorado tests of 1898-1900. from this country to Italy," asserted Dr Tesla. "It was simply an adaptation of my ultra-powerful high-frequency phenomena as carried out in Colorado and cited previously. With a powerful oscillator developing thousands of horsepower, it would become readily possible to detonate powder and munition magazines by means of the high frequency currents induced in every bit of metal even when located five to six miles away and more. Evena powder can would have a potential of 6,000 to 7,000 volts induced in it at that distance. "At the time of those tests, I succeeded in producing the most powerful X-rays ever seen. I could stand at a distance of 100 feet from the X-ray apparatus and see the bones of the hand clearly with the aid of a fluoroscope screen; and I could have easily seen them at a distance several times this . oe . , by utilizing suitable power. In fact, I Nikola Tesla, the famous electric inventor, has proposed three different electrical could not then procure X-ray generators to schemes for locating submerged submarines. The reflected ray method is handle even a small fraction of the power I illustrated above. The high-frequency invisible electric ray, when reflected by a had available. But I now have apparatus submarine hull, causes phosphorescent screens on another or even the same ship to designed whereby this tremendous energy glow, giving warning that the U-boats are near. (Source: The Electrical of hundreds of kilowatts can be Experimenter, August 1917) successfully transformed into X-rays." (ordinarily considered a very good insulator) several hundred feet from my large high-frequency oscillator, and sparks jumped from my shoes!" Back to the Colorado Tests "What particular experiments do you have in mind, Dr Tesla?" I asked. "The Colorado tests of 1898-1900. Nikola Tesla, the famous electric inventor, has proposed three different electrical schemes for locating submerged submarines. The reflected ray method is illustrated above. The high-frequency invisible electric ray, when reflected by a submarine hull, causes phosphorescent screens on another or even the same ship to glow, giving warning that the U-boats are near. (Source: The Electrical Experimenter, August 1917) 50 = NEXUS "I could walk on the sand www.nexusmagazine.com FEBRUARY — MARCH 2008