. The inventions : researches and writing of Nikola Tesla, with special reference to his work in polyphase currents and high potential lighting . ssential for the production of su])erimp()sed waves. In all the last described experiments, tubes devoid t»f any ehe-trodes may be used, and there is iki diHiculty in prodiieing bytheir means siitHcient light to read ijy. Die light effect is, how-ever, considerably increased by the use of |)hosphorescent bodiissuch as yttria, uranium ghiss, etc. A ditliculty will be foundwhen the |>lii»s|)hoiescent material is used, for with these power-liil (tVec
. The inventions : researches and writing of Nikola Tesla, with special reference to his work in polyphase currents and high potential lighting . ssential for the production of su])erimp()sed waves. In all the last described experiments, tubes devoid t»f any ehe-trodes may be used, and there is iki diHiculty in prodiieing bytheir means siitHcient light to read ijy. Die light effect is, how-ever, considerably increased by the use of |)hosphorescent bodiissuch as yttria, uranium ghiss, etc. A ditliculty will be foundwhen the |>lii»s|)hoiescent material is used, for with these power-liil (tVects, it is carriid gi-adually away, tind it is preferable to usematerial in tlii form <tf a solid. Instead of de|Kii(ling on induction ai a distance to light thetid)e, the same may be providid with an txtiriuil antl, it di-sired, also with an internal condenser coating-, and it nia\ then iHS INVENTION^ OF TKKLA. W suspended anywiieiv in the- ruoiii from a euiuluctor connectedto <.ne terminal i)f tlie coil, and in tliis manner a soft ilhimination may be provided. The ideal wa\ of liirlitinir a hall or n»om would, however, be. IffiSfl) • Fk;. Ii.). to produce ^uch a c(.nditirlit«d, no mat-ter where it is put and electrically counected HIGH FREQUENCY AND HIGH POTENTIAL CURRENTS. 189 aiiythiug. I liave beeu able to produce such a condition by creat-ing in the room a powerful, rapidly alternating electrostaticfield. For this purpose I suspend a sheet of metal a distancefrom the ceiling on insulating cords and connect it to one termi-nal of the induction coil, the other terminal being preferably con-nected to the ground. Or else I suspend two sheets as illustratedin Fig. 125, each sheet being connected with one of the tenninalsof the coil, and their size being carefully determined. An ex-hausted tube may then l)e carried in the hand anywhere be-tween the sheets or placed anywhere, even a certain distance]»eyond them ; it remains always luminous
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Keywords: ., bookcentury1800, bookdecade1890, bookidinventionsre, bookyear1894
