. The inventions : researches and writing of Nikola Tesla, with special reference to his work in polyphase currents and high potential lighting . )oles produced upon the other elements should always he main-tained in the ]u-oper relation to the former, irresjKctive of thespeed of the motor. Such a condition exists in a continuouscurrent motor; but in a synchronous motor, such as desci-ibed,this condition is fulfilled oidy when the speed is normal. The object has been attained by placing within the ring a proj)-erly subdivided cylindrical iron core wound with several indepen-dent coils closed u
. The inventions : researches and writing of Nikola Tesla, with special reference to his work in polyphase currents and high potential lighting . )oles produced upon the other elements should always he main-tained in the ]u-oper relation to the former, irresjKctive of thespeed of the motor. Such a condition exists in a continuouscurrent motor; but in a synchronous motor, such as desci-ibed,this condition is fulfilled oidy when the speed is normal. The object has been attained by placing within the ring a proj)-erly subdivided cylindrical iron core wound with several indepen-dent coils closed u]ion themselves. Two coils at right angles as. 1-4. in Fig, 14, are sutticient, but a greater nund)er may be advan-tageously employed. It results fn»m this (lisposition that whenthe poles of the ring are >liift •(!, currents are generated in theclosed armature coils. These currents are the most ;e at ornear the points of the gri-atest density of the lines of force, andtheir effect is to j)rodnce |)o]es upon the armature at right anglesto tliose of till ring, at least thcorrtically so; and since this actionis entirely indejxndent of the s|)eed -that is, as far as the locationof the piles is concerned —a continnons pull is n|)oii theperi])herv of the armature. In many respects these motors aresimilar to the c(tntiiinous current m POLYPHASE CURRENTS. 21 increasing tlie effort. Upon the load being taken off, thecounter-electromotive force inc
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