The U.S. Patents of Nikola Tesla

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) To all ivhom concern,; Be known that Nikola Tesla, citizen of the United States, residing New York, in the county and State New York, have in- 5 vented certain new and useful Improvements in Line Conductors for Systems Electrical Distribution, which the following speci­ fication, reference being had the drawings accompanying and forming part the same, to any system electrical transmission or distribution which currents excessively high potential are employed, and more par­ ticularly, when the frequency high, there is a dissipation energy from the conductor or 15 conductors the line, due the electrifica­ tion the atmosphere other surrounding medium, other causes. When 95 current excessively high potential, how­ ever, used, when the frequency the current very high, such connection isim­ practicable account the loss which fol­ lows. I therefore maintain the sheath either entirely 40 isolated connected directly inductively to the'ground, through path which will prac­ tically prevent the passage currents over it. have also found that when continu­ ous insulated sheath screen employed, 45 there greater liability loss energy by inductive action, for unless the sheath or screen considerably shorter than the cur­ rent waves passing the conductor, electro­ motive forces will set between different 50 points the sheath, which will result the passage between such points induced cur­ rents. SPECIFICATION forming part Letters Patent No. Fig. N Y. B insulating coating. 85 This sheathing divided up, shown, into short lengths sections, and the end one section overlaps telescopes with the end of the adjacent sections but insulated there­ from the material 90 It well known that static screen, be entirely effective such, should have a ground connection, but has been usual in such cases provide good electrical con­ nection from the screen earth. A pplicationfiledJanuary2,1892, SerialNo. means 70 of couductoror conductors thus protected, I may transmit with slight loss and great distances currents very high potential and extremely high frequency. therefore, divide the sheath or screen into short lengths, very much shorter than the wave lengths the current used, so that the grounding any one such lengths 55 or the approach thereto large body will re- sultin inappreciable loss,orat most small local draining ofthe energy,while the tendency of currents flow between different points in the sheath effectually overcome. sectional view por­ tion the conductor enlarged scale.416,773. 514,167, dated February 6,1894. (U om od el. 25 The object invention prevent loss line conductors system electri­ cal transmission and distribution, more par­ ticularly such that described pat­ ent June 23, 1891, No. C conducting sheathing screen, which may externally insulated, desired. at- 65 tain this respect the case sectional screen, causing the ends the insulated divisions sections the same overlap, interposing suitable insulating material be­ tween the overlapping portions. 454,622, but any 30 other system which alternating or, gener­ ally speaking, varying currents excessively high potential are employed. ELECTRICAL CONDUCTOR. The 60 function the sheath static screen for preventing the dissipation the electric en­ ergy, however, requires for its complete ef­ fectiveness uninterrupted conducting par­ tition screen around the conductor. The invention illustrated the accom- 75 panving drawings which— Figure illustrates portions the conduc­ tor with the earth connections above de­ scribed.United States Patent Office. 80 A the central wire conductor that car­ ries the current. I have found that these systems the use of conducting sheath screen around the 35 line conductors and well grounded, even brought into proximity external conduc­ tors large bodies, attended actual and generally serious loss energy. Heretofore has been usual, order to prevent loss dissipation interference by 20 induction line conductors, insulate the same and inclose them continuous con­ ducting sheathing cover which has been connected with the ground good con­ ducting path. such cases, therefore, obtain the 100