The U.S. Patents of Nikola Tesla

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NIKOLA TESLA, NEW YORK, Y. The most convenient conductors for 35 this purpose are composed thin sticks or filaments homogeneous carbon, the ends of which platinum wires are attached, which latter are sealed the glass, and, inside the tube protected coating some insulat- 40 ing material, while their ends outside the tube are connected formed suitable terminals. ELECTRICAL METER. The primary the induction coil is connected series with incandescent lamps or other non-inductive translating devices F, supplied with alternating currents from any 75 suitable generator Under these condi­ tions, since the difference potential the terminals the secondary the induction coil proportionate the primary current, it is, therefore, proportionate the number 80 of lamps other devices F. This variation may used measure the energy current working circuit, I shall now explain more detail and refer- 55 ring the drawings hereto annexed, and in which— Figure illustrates the instrument above described and, diagrammatically, the manner of using the same. The amount, how­ ever, the particles thus thrown off 90 given time proportionate the difference of potential between the two conductors, and hence the increase the resistance the conductors definite proportion the number lamp hours. cross section 60 on enlarged scaleof one the carbon con­ ductors. 514,973, dated February 20, 1894. ApplicationfiledDecem ber15,1893. The carbons are supported the metallic conductors preferably plati­ num whole part, and having inside 70 the receiver coating insulating material L.United States Patent Office. Thus, the energy 95 may computed from the variation the resistance the conductors the following manner: The resistances the conductors are accurately measured any the usual ways. Then known current caused 10c pass for given time through the primary of the induction coil and given number of lamps. SPECIFICATION forming part Letters Patent No. The action the discharge the tube C from one conductor the other produces a uniform throwing off the infinitesimal par­ ticles carbon along the entire length 85 the conductors, the difference potential between the two practically equal all points, and the increase resistance will, therefore, uniform. SerialN o. The resistances the conductors are then taken again and the increase gives the . The invention based the fact that when high tension discharge made pass from conductor through rarefied gas, mi- 20 nute particles are thrown off from the con­ ductor and are embodied any apparatus in which the proper conditions for the above re­ sults are present, and which the amount of the particles thrown off from the conductor 25 conductors result such action in proportion the strength the current, the energy which computed, and can be measured from time time. Fig.493,739, JNomodel. One terminal each the carbon con­ ductors sealed above described in the tube receiver connected ter- 65 minal the secondary high tension induction coil, preferably constructed with­ out iron. The glass tube provided with a small tube through which exhausted to - the properdegree and which sealed off after 45 exhaustion the usual manner. the most convenient means utilizing this principle 3c carrying out invention, have devised an instrument the following character: In a tube other receiver, preferably glass, are placed two conductors, parallel each other. the two conductors carbons connected the two parts circuit over which flows alter­ nating current high tension, discharge takes place from one carbon the other al­ so ternately, that causes infinitesimal particles to thrown off from each, which appreciably increases their electrical resistance.) To all whom concern: Beit known that 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 Electrical Meters,ofwhich the following is a specification, reference being had the drawings accompanying and forming part of the same, io The subject this invention novel method and apparatus for computing the energy that has been expended given time circuit, and more particularly de­ signed for measuring the expended energy of IS alternating currents and those varying strength