. The inventions : researches and writing of Nikola Tesla, with special reference to his work in polyphase currents and high potential lighting . Teslushows that dilTusion is absolutely necessary for liic ixiiialion and whenthe disc is subdivided no cxrltalion ran occin-. 472 lyVENriONS OF XrKOLA TKSLA. litld iiciirot the , and the roils in the liehl further from the magnets sliijlitly ener«rized at tlie start; thev could bei^treiiu^theiied bv the action of the eddy currents in the solid diset^o as to afford a stroni^er field for the ])erij)iieral coils. Althoughthere is n
. The inventions : researches and writing of Nikola Tesla, with special reference to his work in polyphase currents and high potential lighting . Teslushows that dilTusion is absolutely necessary for liic ixiiialion and whenthe disc is subdivided no cxrltalion ran occin-. 472 lyVENriONS OF XrKOLA TKSLA. litld iiciirot the , and the roils in the liehl further from the magnets sliijlitly ener«rized at tlie start; thev could bei^treiiu^theiied bv the action of the eddy currents in the solid diset^o as to afford a stroni^er field for the ])erij)iieral coils. Althoughthere is no doubt that under proper conditions a machine mightbe excited in this or a similar manner, there being sutticient ex-perimental evidence to warrant sucii an assertion, such a mode ofexcitation would be wasteful. But a uni|)olar dvnamo oi- motor, such as shown in Fiir. 2l> be excited in an ethcient maniiei by simply ])roperly subdi-viding the disc or cylinder in which the currents are set uj>, andit is ])racticable to do away with the field coils which are usuallyem])loyed. Such a plan is illustrated in Fig. 1\K\. The di^c or. Fig. 293. Ftc. 201. cylindei o is supposed to be aiTanged to rotate between the twopoles N and s (»f a magnet, which c(»mpletely cover it on bothbides, the c»»nt»tnrs of the disc and poles being represented i)y thecircles </ and ^/ respectively, the upper pole being omitted forthe sake of clearness. The cures of the magnet an- sup])osed tobe hollow, the shaft ubdi\ ided .-pirally, as UmrOLAR GENERATORS. 473 indicated by the full or dotted lines, Fig. 205. The difference ofpotential between a point on the shaft and a point on the peri
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Keywords: ., bookcentury1800, bookdecade1890, bookidinventionsre, bookyear1894
