. The Street railway journal . l Exposition Rail-way. In the Suffren power station of the Exposition oneof the largest engines was supplied by Willans & Robin-son. This engine is of the well-known Willans type, is of2400 rated hp, and is direct connected to a 1340-kw direct-current 500-volt generator, built by Siemens Bros. Withthe possible exception of one German engine, which is ofabout equal capacity, it is the largest engine in either of thetwo electrical stations at the Exposition. 820 STREET RAILWAY JOURNAL. [Vol. XVI. No. 35. CORRESPONDENCE Breaking of Copper Trolley Wire Societa Genera
. The Street railway journal . l Exposition Rail-way. In the Suffren power station of the Exposition oneof the largest engines was supplied by Willans & Robin-son. This engine is of the well-known Willans type, is of2400 rated hp, and is direct connected to a 1340-kw direct-current 500-volt generator, built by Siemens Bros. Withthe possible exception of one German engine, which is ofabout equal capacity, it is the largest engine in either of thetwo electrical stations at the Exposition. 820 STREET RAILWAY JOURNAL. [Vol. XVI. No. 35. CORRESPONDENCE Breaking of Copper Trolley Wire Societa Generale Italiana Edison di Elettricita,Milan, Italy, July 11, Street Railway Journal: Where the copper trolley wire on our system has brokenwe have noticed the constancy of certain marked charac-teristics that we think may be of some interest to yourreaders. The broken surface is never homogeneous, butconsists of one part showing a fresh break, and one or twoother parts showing a series of concentric zones of brown. SECTIONS OF TROLLEY WIRE (Enlarged about five times actual size) oxide. I he photographs annexed represent some of thesesurfaces. ll would seem from these sections that the breaking isnot due to a sudden strain or to a reduction of the area,but occurs gradually and during a comparatively longspace of time. It would be interesting to know if other observations ofthis kind have been made on other roads, and if any investi-gations have been made to determine the cause of thisinitial weakening of the wire. Guido Semenza. ♦♦♦ Polyphase Distribution for Electric Railways Denver, Col., Aug. 10, Street Railway Journal: 1 >r. Louis Bell lias, in this months Street RailwayJournal, what appears to me to be a very timely word ofcaution against the extravagant application of the three-phase method of distribution for railways. To be in fashionsome railway companies are evidently using it when theordinary well known and much cheaper methods are avail
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