. The inventions : researches and writing of Nikola Tesla, with special reference to his work in polyphase currents and high potential lighting . j. Tlie lield-coils lia\e tiieii- teriiiiiials in liinding-|»osts kK, atid may be eitlu-r closed upon themselves or connected witha source of direct cnrrent i,, by means of a switch M. The mainor controlling switch has five contacts a h ■ and two levers /y, pivoted and connected by an insulating cross-bar //, so as t«» move in jtarallelism. These lexers ;i|-e ediineeted fo the line POLYPHASE CURRENTS. 57 wires from a source of alternating currents n.
. The inventions : researches and writing of Nikola Tesla, with special reference to his work in polyphase currents and high potential lighting . j. Tlie lield-coils lia\e tiieii- teriiiiiials in liinding-|»osts kK, atid may be eitlu-r closed upon themselves or connected witha source of direct cnrrent i,, by means of a switch M. The mainor controlling switch has five contacts a h ■ and two levers /y, pivoted and connected by an insulating cross-bar //, so as t«» move in jtarallelism. These lexers ;i|-e ediineeted fo the line POLYPHASE CURRENTS. 57 wires from a source of alternating currents n. Contact a is con-nected to brush G and coil b through a dead resistance r andwire p. Contact h is connected with brush f and coil a througha self-induction coil s and wire o. Contacts c and e are connectedto brushes g f, respectively, through the mres p o, and contactd is directly connected with brush h. The lever/ has a widenedend, which may span the contacts a h. When in such positionand witli lever g on contact fZ, the alternating currents divide l)e-tween the two motor-coils, and Ijy reason of their different self-. Fm. 41. induction a diffor(MU(> of curront-])hase is obtained tliat starts themotor in rotation. In stiirting, tlii licld-coils are sliort circuited. WIuMi tlie motor lias attained tlic disirid spied, the switch isHhiitcd to the position shown in dotted lints that is t(» say, withthe le\(rs/y resting on points c < . This eoimeets up the twoarmature la in (k\ cl(»])iiiirhis i-otiirv ])lia>c iiiotoiv is to j)i-(Kliice ])riKticiillv iiuk])en(lentcurrents dirtYi-inir ])iiinnrily in pliaso and to ])ass tliisi tlirouij:li themotor-circuits. Anothci- wav is to |»io(hi(t a >iniil(. alternatingcurrent, to divide it i)et\veen the nK)tor-circuits, and to effectartiticially a lag in on
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Keywords: ., bookcentury1800, bookdecade1890, bookidinventionsre, bookyear1894
