. The inventions : researches and writing of Nikola Tesla, with special reference to his work in polyphase currents and high potential lighting . mall surface—in other words, I have worked witha fifreat electric density. A most curious form of dischaiire i^ ni)^er\((l with snch a coil HIGH FREQUENCY AND HIGH POTENTIAL CURRENTS. 219 when the freqiieiicv and potential are pushed- to the extremelimit. T(j perform the experiment, every part of the coil shouldbe heavily insulated, and only two small spheres—or, better still,two sharp-edged metal discs {d d^ Fig. i-tO) of no more thana few centimetr
. The inventions : researches and writing of Nikola Tesla, with special reference to his work in polyphase currents and high potential lighting . mall surface—in other words, I have worked witha fifreat electric density. A most curious form of dischaiire i^ ni)^er\((l with snch a coil HIGH FREQUENCY AND HIGH POTENTIAL CURRENTS. 219 when the freqiieiicv and potential are pushed- to the extremelimit. T(j perform the experiment, every part of the coil shouldbe heavily insulated, and only two small spheres—or, better still,two sharp-edged metal discs {d d^ Fig. i-tO) of no more thana few centimetres in diameter—should be exposed to the coil here used is immersed in oil, and the ends of thesecondary reaching out of the oil are covered with an air-tightcover of hard rubber of great thickiiess. All cracks, if thereare any, should be carefully stopped up, so that the brush dis-charge cannot form anywhere except on the small spheres orplates which are exposed to the air. In this case, since thereare no large plates or other bodies of capacity attached to theteniiiiials, the coil is capable of an extremely rapid Fi(i. 14U. Tlie ])oteiitial may be raised by increasing, as far as the experi-menter jiulges proper, the rate of chaiigi f the primary cur-Iciit. With a coil not widely dilVfi-iiig tVoiii the prtsiiit, it isbest to eoiiiiect the two |)rimaries in miiltipkarc ; but it thesecoiidjiiT should have a imicli greater iiuniber of tiini> the|)iiiii;iiies should |)releral>ly be used in series, us olliei\vi>i thevibration might be too fast for the sicondary. It occui-s underthese conditions liijit misty white streams bi-enk forth from theedges of ihe (Mm-- :ind s|»i-ead out liki into this coil, when fairly well produced, thi-y are about J. ) ceiitiiiMtres long. When the hand is hild against them nosensation is produced, and a spark, causing a shock, jumps froiu 220 ryVKNTfOXS OF X/KO/.A rlie teniiiiial oiilv u
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Keywords: ., bookcentury1800, bookdecade1890, bookidinventionsre, bookyear1894
