The U.S. Patents of Nikola Tesla

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SPECIFICATION forming part Letters Patent No. For instance, as the primary source current electrical 75 energy continuous-current generator may be used, the circuit which may inter­ rupted with extreme rapidity mechani- - cal devices, magneto-electric machine specially constructed yield alternating cur- 80 rents very small period may used, and in either case, should the potential too low, an induction-coil may employed-to raise it; or, finally, order overcome the mechani­ cal difficulties, which such cases become 85 practically Insuperable before the best resulis are reached, the principle the disruptive discharge may utilized. 390,414. N Y.) To whom concern: Be known that Nikola Tesla, sub­ ject thé Emperor Austria-Hungary, from Smi]jan, Lika, bordercountryof Austria-IIun- 5 gary,and resident NewYork,in the county and State New York, have invented certain new and useful Improvements Methods of and Apparatus for Electric Lighting, which the following specification, reference be- io ing had the drawings accompanying and forming part the same; This invention consists novel method of and apparatusfor producing light means of electricity. Such discharge is . contemplate using are far above what have heretofore been regarded practicable. As an instance what regard the lowest 15 practicable limits would state that have obtained fairly good results frequency as low fifteen thousand twenty thousand • per second and potential about twenty thousand volts. SYSTEM ELECTRIC LIGHTING. . 454,622, dated Tune 23,1891. other words, have made the discovery that electrical current ex­ cessively small period and very high poten­ tial may utilized economically- and prac­ ticably great advantage for the production 35 light. means this latter plan produce much greater rate of change the current than the other means 90 suggested, and illustration invention I shall confine the description the means or apparatus for producing the current this plan, although would not understood as limiting myself its use. Ido not mean by the term “excessively small period” and similar expressions herein imply that 55 contemplate any number pulsations vi­ brations per second approximating the number light-waves, and this will more fully appea from the description the na­ ture invention which hereinafter con- Co tained. Both frequency and poten- 50 tiaj may enormously increased above these figures, the practical limits being determined by the character the apparatus and its ca­ pability standingthestrain. Serial No. These shall now describe. The carrying out this invention and the full realization the conditions necessary to the attainment the desired results involve, first, novel method and apparatus for 65 producing the currents electrical effects of the character described; second, novel method utilizing and applying the same for the production light, and, third, new form translating device light-giving ap- 7c plianee.nited States Patent Office. Application filedApril 25,1891. It difficult for define the exact lim­ its offrequencyandpotentialwithin which my discovery comprised, for the results ob­ tained are due both conjointly; but would 40 make clear that the inferior limits of both, the lowest frequency and potential that I. (Homodel.have discovered 25 that results the most useful character may be secured under entirely practicable condi­ tions means electric currents which both the above-described conditions high frequency and great difference potential 30 are present. The current 95 high frequency, therefore, that necessary to the successful working invention I produce the disruptive discharge the accumulated energy condenser main­ tained charging said condenser from 100 suitable source and discharging into or through circuit under proper relations of self-induction,capacity, resistance,andperiod in well-understood ways. To produce acurrent ofvery high frequency and very high potential, certain well-known devices may employed. 15 Fora better understanding the inven­ tion may stated, first, that heretofore I have produced and employed currents very high frequency for operating translating de­ vices, such electric lamps, and, second, aa that currents high potential have also been produced and employed for obtaining lumi­ nous effects, and this, broad sense, may be regarded for purposes this case the prior state the art; but I