. The Street railway journal . r commuta- tator 46,000 lbs. Armature copper 2,700 lbs. Commutator with spider 16,450 lbs. Armature complete 67,500 lbs. Field complete, including brush holderand bed plate 140,720 lbs. Bed plate 23 ft. long, 4 ft. 7 ins. wide. In order to equalize the weight on the two main enginebearings as well as to protect the commutator from anydanger from oil, these machines are placed on the shaft thereverse of the common practice—that is, the commutatoris next the fly-wheel. The wheels will be encased to pre-vent any possible chance of accident from this arrange-ment, an
. The Street railway journal . r commuta- tator 46,000 lbs. Armature copper 2,700 lbs. Commutator with spider 16,450 lbs. Armature complete 67,500 lbs. Field complete, including brush holderand bed plate 140,720 lbs. Bed plate 23 ft. long, 4 ft. 7 ins. wide. In order to equalize the weight on the two main enginebearings as well as to protect the commutator from anydanger from oil, these machines are placed on the shaft thereverse of the common practice—that is, the commutatoris next the fly-wheel. The wheels will be encased to pre-vent any possible chance of accident from this arrange-ment, and steps carried on this casing will give access tothe upper brushes. The armatures are very open and ac-cessible for cleaning, and are thoroughly ventilated. Theheating is remarkably low on these machines. The main shafts of these engine generator units are wor-thy of special notice. They were made by the BethlehemIron Company upon the companys specifications. Twoof these shafts are 20 ft. 5 J ins. long and the other two are. PUMPS, FEED WATER HEATERS AND PURIFIERS 1 ft. longer. The weight of each of the two shorter onesis 29,600 lbs., and of the longer ones 31,500 lbs. Thechemical composition of the shafts is as follows: , phosphorus and sulphur less than .04. The tensilestrength of the material was lbs. per square in., the November, 1898. STREET RAILWAY JOURNAL. 697 elastic limit 35,000 lbs., and the extension 25 per cent intest specimens \ in. in diameter and 2 in. long. The shaftsare made of open hearth steel fluid pressed tinder 7000tons hydraulic pressure and forged by hydraulic pressureunder a 5000-ton press. They were subsequently annealedto relieve them of forging and cooling strains. The shapeand diameters of the shaft are shown in Fig. 6. The station is at present run non-condensing, therebeing no water available for condensing purposes. A be placed in a favorable position suited to the conditionsunder which it is operating. The separators for this
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
