. Electric railway journal . ere short-circuit occur on one of these parallel lines,say at S, it would of course be fed from both directions. The current passing through the reverse power relay xwould open the circuit at that point, and thus the otherparallel line would be relieved of the effect of theshorted line, and power on the former would not beinterrupted. Without the use of the reverse-power re-lays the circuit breaker at y would probably be tripped,and thus both parallel feeders would be cut off and thepower beyond that point would be interrupted. Arc Welding Rails to a Bridge Drillin
. Electric railway journal . ere short-circuit occur on one of these parallel lines,say at S, it would of course be fed from both directions. The current passing through the reverse power relay xwould open the circuit at that point, and thus the otherparallel line would be relieved of the effect of theshorted line, and power on the former would not beinterrupted. Without the use of the reverse-power re-lays the circuit breaker at y would probably be tripped,and thus both parallel feeders would be cut off and thepower beyond that point would be interrupted. Arc Welding Rails to a Bridge Drilling of Large Number of Holes Through 3^ Avoided by Spot-Welding BY R. C. CRAM Assistant Engineer Way and Structure Department BrooklynRapid Transit System New ways in which the arc welder may be used areconstantly being reported and they are naturally of con-siderable interest to those who have welders in may not be out of place, therefore, to describe an-other instance in which the welder helped to solve a. PART OF BRILGE STRUCTURE, SHOWING RAILS AND CHAIRSWHICH THEY WERE SPOT-WELDED TO problem which, at first, appeared to be somewhat diffi-cult. It became necessary to install new rails on a newbridge recently built by the New York Connecting Rail-road to carry a street over its new right-of-way atGrand Street in the Borough of Queens. As will beseen in the illustration, the bridge plans provided thatthe street railway rails were to rest on chairs which inturn were rigidly fastened directly to the top flangesof the top struts between the three main girders un-der each track. Incidentally the chairs were made up ofplates of a thickness sufficient to make a total depth ofchair of 3V4 in. March 10, 1917] ELECTRIC RAILWAY JOURNAL 445 When the bridge was in place ready to receive therails, it was found that no provision had been made forfastening the rails to the chairs either by bolts or it was expected that the drilling in the fieldof the necess
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