. Electrical world. FIG. S.—COMPOUNDING DIRECT-CURRENT MACHINES. apparatus of Goerges for demonstrating the oscillations of parallelrunning alternators.—Lond. Elec., May 6. Compounding of Single Machines Supplying a Three-lVire System.—Rosenberg.—If a single direct-current machine for supplying athree-wire network is to be compounded, the series winding is gen-erally placed in the two outers, /^ and /„, as indicated in Fig. 5 bythe coils. H and //.,. But this division of the series winding is not 1030 ELECTRICAL WORLD and ENGINEER. Vol. XLIII, No. 22. always possible. The author shows that the
. Electrical world. FIG. S.—COMPOUNDING DIRECT-CURRENT MACHINES. apparatus of Goerges for demonstrating the oscillations of parallelrunning alternators.—Lond. Elec., May 6. Compounding of Single Machines Supplying a Three-lVire System.—Rosenberg.—If a single direct-current machine for supplying athree-wire network is to be compounded, the series winding is gen-erally placed in the two outers, /^ and /„, as indicated in Fig. 5 bythe coils. H and //.,. But this division of the series winding is not 1030 ELECTRICAL WORLD and ENGINEER. Vol. XLIII, No. 22. always possible. The author shows that the arrangement of Fig. 6is equivalent. Here the coil, H, is inserted in one outer, and thecoil, h, in the neutral, while the second outer has no excitater wind-ing. Fig. 6 shows the arrangement of Debrowolsk>-, where the neutralwire is connected to the central point of an induction coil, T, the two. OMPOUNDING DIRECT-CUBKENT MACHINES. terminals of which are connected to two slip rings on twd diamet-rically opposite points of the armature. The number of turns of hmust be one-half of H. The cross-section of the winding, h, is to bedetermined according to to the value of the differential current, whichit has to carry.—Zeit. f. Elek. (Vienna), May i. REFERENCES. Alternators.—ATCKisos.—Tht first part of an illustrated paper,read before the Birmingham Section of the British Institute of Elec-trical Engineers, on some properties of alternators under variousconditions of loads. After some brief remarks on the on opencircuit, he discusses the induced with the machine loaded, bothfor non-inductive and inductive load, diagrams being given.—, May 6. Alternators.—Hay.—In a continuation of a serial on the theory ofalternators he gives, with the aid of diagrams, the analytical andgraphical theory of the ideal alternator.—Lond. Elec. Mag., April 26. Single-Ph
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