. The inventions : researches and writing of Nikola Tesla, with special reference to his work in polyphase currents and high potential lighting . ^e illustrated in Fig. 97 causedme the least trouble in construction, as well as in maintenance,and on the whole, it has been a good exijerimental machine. In operating an induction coil with very rapidly alternatingcurrents, among the tirst luminous phenomena noticed are natur-ally those presented by the high-tension discharge. As the num-ber of alternations per second is increased, or as—the numberbeing higli—the current through the primary is vari
. The inventions : researches and writing of Nikola Tesla, with special reference to his work in polyphase currents and high potential lighting . ^e illustrated in Fig. 97 causedme the least trouble in construction, as well as in maintenance,and on the whole, it has been a good exijerimental machine. In operating an induction coil with very rapidly alternatingcurrents, among the tirst luminous phenomena noticed are natur-ally those presented by the high-tension discharge. As the num-ber of alternations per second is increased, or as—the numberbeing higli—the current through the primary is varied, the dis-charge gradually changes in appearance. It would be difficult todescribe the minor changes which occur, and the conditions which. Il. bring tliem about, but one may note five disthict fdrms of rlu*discliiirgc. First, one iiiiiy observe a weak, sensitive discliai-gi in tlu tonnof a tliin, fttble-colorcd tliread. (Fig. lUOa.) It always occursvvIkmi, the iiuMibci-of alternations per second being liigli, the cur-rent tlii-oMgli the primary is very small. In spite of the exces-sively small current, the rate of ciiange is great, and the ditfer-ence of potential at the terminals of the seeonilary is thereforeconsiderable, so that the arc is establishc*! at great distances; butthe (piantity of electricity set in inoti»»n is insigniticant, barelysutticient to iiiiiintain a thin, threadiiki arc. It is excessivelyKonHitive: and may he made so to such a degree that the nure actof breathing near the coil will alVccl il. and uidess it is perfeetK 156 IXVENTIONS OF NTKOLA TRSLA. well protected imxw cunviitsnt air, it \vn^i;le> aiouiul coiif^, it is in this form excessively jxirsistiiit, and whenthe ter
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Keywords: ., bookcentury1800, bookdecade1890, bookidinventionsre, bookyear1894
