. The inventions : researches and writing of Nikola Tesla, with special reference to his work in polyphase currents and high potential lighting . score is wound the secondai-y circuit or coil i; ii. This latter isthen covered with a layer or layers of anneah-d and insulattdiron wires c r, wound in a <lircction a! riulit angles to the secundary POLYPHASE CURRENTS. 115 coil. Over the whole is then wound the primarv coil or wire the nature of this construction it will be obvious thatas long as the shield formed by the wires c is below magneticsaturation the secondary coil or circuit is
. The inventions : researches and writing of Nikola Tesla, with special reference to his work in polyphase currents and high potential lighting . score is wound the secondai-y circuit or coil i; ii. This latter isthen covered with a layer or layers of anneah-d and insulattdiron wires c r, wound in a <lircction a! riulit angles to the secundary POLYPHASE CURRENTS. 115 coil. Over the whole is then wound the primarv coil or wire the nature of this construction it will be obvious thatas long as the shield formed by the wires c is below magneticsaturation the secondary coil or circuit is effectually protected orshielded from the inductive influence of the primary, althoughon open circuit it may exhibit some electromotive force. Whenthe strength of the primary reaches a certain value, the shield c,becoming saturated, ceases to protect the secondary from induc-tive action, and current is in consequence developed similar reasons, when the primary current weakens, theweakening of the secondary is retarded to the same or approxi-Tuately the same extent. The speciiic construction of the transformer is largely imnia-. Fi(.. .»(•). t(i-ial. Ill Fig. iMI, for example, the core a is built \\\> of thininsulated iioii plates or discs. The ])rimary circuit d is woundnext the core a. ()\(r this is ap])liecase is made u|> ot thin strii)8 or ])lates of iron properly insulatedand surrounding the primary, forming a closed magnetic secondary h is wound over the shield c. In Fig. tHJ, also,K is a source of alternating i)v i-a|»i(ll\ changing ^ primary of the tran^loiincr is connected with tlucircuit otI he generator, i is a two-circuit alternating current niot(U\ oiuol the circuits lieing connecteil with the main circuit tr()m tlu-source K, and the othir heing .sup|ilied with ciirrtMits Iidm thesecondary of the transformer. PART THETESLA EFFECTS WITH HIGH FREQUENCYAND HIGH POTENTIAL CURRENTS. CHAPTER XXV. Introduction.—The Scope of
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