. The Street railway journal . d the bloomswere then thoroughly cleaned by the sand blast, and acubic mass of iron, about 2 ft. x 2 ft. x 2 ft., at a heat toinsure a weld, was then cast around the whole. It is esti-mated that 2900 lbs. of metal were used in each of the threejoints. On to the planed surfaces of the blooms long brassblocks, into which the cables from the service rails weresoldered, were bolted, care being taken to follow up thesteel cap screws with the wrench until the joint was per-fectly cold. The copper bars were similarly bolted to thetwo steel 7 ins. x 7 ins. bloom ends whe
. The Street railway journal . d the bloomswere then thoroughly cleaned by the sand blast, and acubic mass of iron, about 2 ft. x 2 ft. x 2 ft., at a heat toinsure a weld, was then cast around the whole. It is esti-mated that 2900 lbs. of metal were used in each of the threejoints. On to the planed surfaces of the blooms long brassblocks, into which the cables from the service rails weresoldered, were bolted, care being taken to follow up thesteel cap screws with the wrench until the joint was per-fectly cold. The copper bars were similarly bolted to thetwo steel 7 ins. x 7 ins. bloom ends when it was clear thatno further slackening of contact at the surfaces could re-sult from contraction due to the drop in temperature. Thebond wires, brass blocks, copper cables and cast-weldedjoints were then covered with concrete. The result of the installation of this auxiliary negativeas shown in the reduced heat at the switchboard and at theloose service rail-joints was immediately felt. The danger ; . |?-G O O O O in t r Trr. Street FIG. 3.—ARRANGEMENT OF STEEL BLOOMS AT END OF OLDRAILS, NEAR THE POWER STATION of electrolytic action on nearby gas and water pipes mustprove less now that the current density has been reducedto a maximum of 500 amps, per square inch of objects of the work were thus gained. A valuable gain was also made in another tests were made before and after these old railswere connected up, and it was found that there was anannual saving made in power required to force the currentback to the negative bus-bar from the two centers, referredto, amounting to 2\ per cent of the total annual output ofthe power house. Looking at it from another point—kilo-watt hours that cost $4,700 per year were released fromthe task of heating the negative conductors and appliedto the propulsion of the cars. As 2\ per cent of the cars onany one of the numerous lines of the Market Street Com-panys electric systems usually amounts to only
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
