. The inventions : researches and writing of Nikola Tesla, with special reference to his work in polyphase currents and high potential lighting . t counteracted the self-in-duction with tbe existing frequency. If the capacity was in-creased or diminished, the electromotive force fell as expected. With frequencies as high as the above mentioned, the con-denser effects are of enormous importance. The condenserbecomes a highly efficient apparatus capable of transferringconsiderable energy. in an uppctidix to this hooi< will he Ionnd a drscription of X\\(-Tesla oscillator, which itsinventor bel
. The inventions : researches and writing of Nikola Tesla, with special reference to his work in polyphase currents and high potential lighting . t counteracted the self-in-duction with tbe existing frequency. If the capacity was in-creased or diminished, the electromotive force fell as expected. With frequencies as high as the above mentioned, the con-denser effects are of enormous importance. The condenserbecomes a highly efficient apparatus capable of transferringconsiderable energy. in an uppctidix to this hooi< will he Ionnd a drscription of X\\(-Tesla oscillator, which itsinventor believes will among other greatadvantages give him the necessary high fre(|uency conditions,while relieving him of the inconveniences that attach to genera-t<»rs of the type <lcscrih((l at the beginning of this chapter. CHAPTER XXX. Alternate Current Electrostatic Induction Apparatus.* About a year and a half ago while eiii2:ai;e(l in tlu study ofalternate ciiiTents of short period, it occurred to mc that suchcurrents could he obtained by rotatiuij charijed surfaces in closeproximity to conductors. Accordiuirly I devised vari(tus forms. 2()s. of experimental ai)paratus of whicli t\V(« are illustratiMJ in the;icconi])anyinj^ enrovi(led on its inside with two sets of tin-foilcoatings, a and /;, all the a coatings and all the h coatings beingconnected together, respectively, hut inchpendent from eachother. These two sets of coatings are connected to two tenni- 1. Article J)y Mr. Ti-hIh in The Klertrmil Kii<iinrfr, N. Y., May 6. 1891. HIGH FREQUENCY AND HIGH POTEXTIAL CURRENTS. 393 nals, T. For the sake of clearness only a few coatings are of the ring a, and in close proximity to it there is arrangedto rotate a cylinder b, likewise of dry, shellacked hard wood, andprovided with two similar sets of coatings, a^ and J\ all the coat-ings a} being connected to one ring and all the others, 5^, toanother marked -|- and —. These two sets, «^ and 1/ are charge
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