. Electrical news and engineering . these generators. The entire distributing system haslated between the layers with a special oil-cloth which been arranged to be run in parallel, and, in order to dois practically indestructible at temperatures under 150C. this the generators must be kept in phase. There are To the dynamo builder the advantage of constructing some objections, however to paralleling 5,000 volt ma- a field coil on such lines is very apparent. With a free chines through their principal circuits—also do diflScul- circulation of air, and every turn ot the winding being, ties occur
. Electrical news and engineering . these generators. The entire distributing system haslated between the layers with a special oil-cloth which been arranged to be run in parallel, and, in order to dois practically indestructible at temperatures under 150C. this the generators must be kept in phase. There are To the dynamo builder the advantage of constructing some objections, however to paralleling 5,000 volt ma- a field coil on such lines is very apparent. With a free chines through their principal circuits—also do diflScul- circulation of air, and every turn ot the winding being, ties occur in par:illeling long transmission lines. A de- fer cooling purposes,practically in contactwith the moving air,there is no possibility ofoverheating in any por-tion of the coil. Thecopper bobbin, absorbingall discharges, preventsany excessive rise of elec-tromotive-force on thecoil, which might becaused by carelessly, or,under extreme circum-stances, intentionally,opening the field circuitunder full charge. There are, in all, 56. The DisTRiBi tim; Station, Moxtmorexcv ; l\ 1 armature coils, 28 for each phase. The coils are smalland were wound in a lathe. Each coil was carefullyinsulated to stand 15,000 volts before placing it in thearmature. The insulation of the completed armaturewas tested, finally, with 12,000 volts. The inductor, the only moving portion of the ma-chine, is a steel casting, 43 inches long, and 84 inchesin diameter, upon the periphery of which are two setsof polar projections of iron lamina;, fourteen at eachend. The weight of the inductor, including the shaft,is 28,470 pounds. The net weight of the completedmachine is, approximately, 100,000 pounds. In the operation of alternating current motors, andalso of transformers, it is now generally recognized asimportant that the currents and magnetic fluxes shouldvary sinusoidally, for the more nearly such a conditionis approached, the less are the losses and idle first step toward obtaining t
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