. The inventions : researches and writing of Nikola Tesla, with special reference to his work in polyphase currents and high potential lighting . ]• phenomena, and it is my desiiv that eachex])erinunt, while serving for the purposes of illustiation, shouldat the same time teach us some novel truth, or show us somenovel aspect of this fascinatin<;; science. Ihit befoi-e (loin<r this, itseems j)roper and useful to dwell ujxni the a]tparatus employed,and method of obtainini; the hii:;li ])otentials and hi^h-freijuencvcurrents which are ma<le use mkiiioo oi convkksion. These hii:;h-fre()u
. The inventions : researches and writing of Nikola Tesla, with special reference to his work in polyphase currents and high potential lighting . ]• phenomena, and it is my desiiv that eachex])erinunt, while serving for the purposes of illustiation, shouldat the same time teach us some novel truth, or show us somenovel aspect of this fascinatin<;; science. Ihit befoi-e (loin<r this, itseems j)roper and useful to dwell ujxni the a]tparatus employed,and method of obtainini; the hii:;li ])otentials and hi^h-freijuencvcurrents which are ma<le use mkiiioo oi convkksion. These hii:;h-fre()uency currents ari obtained in a j»e( idiar man-ne)-. The methofl employed was advanced bv me about twoyears ago in an experimental lecture before the American Insti-tute of Electrical Engineers. A numbei- of ways, as practici-d inthe laboratory,of obtaining these currents either from continuousor low frctpiency alternating currents, is diagramatically indicatedin Fig. Hi.), wlii<h will be later described in detail. The LrenernI HIGH FBKQVENCT AND IlIGU POTEXriAL CURRENTS. 303. 304 IWKXTIOys OF NIKOLA TESLA. plan is t(» c-liar<j:e condensers, fr(»in a direct or alternate-currentsource, preferably of liiijh-tension, and t discharj^e themdisruptively wliile observinir well-known conditions neces-sary to maintain the oscillations of the current. In view of thegeneral interest taken in hii;h-fre(|uency currents and effects pro-ducible hv them, it seems to me advisjible to dwell at some lengthupon this method of conversion. In i>rder to give you a clearidea of the action, I will sup])ose that a continuous-current gen-erator is employed, which is often very convenient. It is desirablethat the generator should possess such high tensi(»n as to be ableto break through a small air space. If this is not the case, tlit-iiauxiliarv means have to be resoited to, some of which will be in-dicated subsequently. AVhen the condensers are charged to acertain potential, the air, or in
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