Nikola Tesla - Free-Energy Devices

Iimil FRKQURNOY AND HIGH POTENTIAL CURRENTS.Illmake the primary in sections and supply it from separate, wellinsulated sources.In many of these experiments, when powerful effects arewanted for a short time, it is advantageous to use iron cores withthe primaries. In such case a very large primary coil may bewound and placed side by side witli the secondary, and, the nearestterminal of the latter being connected to the primary, a laminatediron core is introduced through the primary into the secondaryas far as the streams will permit. Under these conditionsan excessively powerful brush, several inches long, which maybe appropriately called " St. Elmo's hot fire," may be caused toappear at the other terminal of the secondary, producing strikingeffects. It is a most powerful ozonizer, so powerful indeed, thatonly a few minutes are sufficient to fill the whole room with thesmell of ozone, and itundoubtedly possesses the quality of excitingchemical affinities.For the production of ozone, alternating currents of veryhigh frequency are eminently suited, not only on account of theadvantages they offer in the way of conversion but also becauseof the fact, that the ozonizing action of a discharge isdependenton the frequency as well as on the potential, this being undoubtedlyconfirmed by observation.In these experiments if an iron core is used it should be carefullywatched, as it is apt to get excessively hot in an incrediblyshort time. To give an idea of the rapidity of the heating, Iwill state, that by passing a powerful current through a coil withmany turns, the inserting within the same of a thin iron wire forno more than one second's time is sufficient to heat the wire tosomething like 100 C.But this rapid heating need not discourage us in the useof iron cores in connection with rapidly alternating currents.I have for a long time been convinced that in the industrial distributionby means of transformers, some such plan as the followingmight be practicable. We may use a comparatively small ironcore, subdivided, or perhaps not even subdivided. We may surroundthis core with a considerable thickness of material whichis fire-proof and conducts the heat poorly, and on top of that wemay place the primary and secondary windings. By using eitherhigher frequencies or greater magnetizing forces, we may byhysteresis and eddy currents heat the iron core so far as to bringit nearly to its maximum permeability, which, as Hopkinson has