. The Street railway journal . f the turbine over reciprocating engines in electricrailway work, it compares favorably with the results obtained in alarge number of the better class of stations using the latter type ofprime movers, and gives some force to the opinion that in actualpractice there will be found to be very little difference in the coalconsumption of steam turbine and reciprocating engine plants oper-ating under similar conditions. In order to develop the highest efficiency of the steam turbine,it is necessary to operate with a very high vacuum. It is claimedthat each inch of vacu
. The Street railway journal . f the turbine over reciprocating engines in electricrailway work, it compares favorably with the results obtained in alarge number of the better class of stations using the latter type ofprime movers, and gives some force to the opinion that in actualpractice there will be found to be very little difference in the coalconsumption of steam turbine and reciprocating engine plants oper-ating under similar conditions. In order to develop the highest efficiency of the steam turbine,it is necessary to operate with a very high vacuum. It is claimedthat each inch of vacuum above 26 ins. will increase the economyfrom 3 per cent to 4 per cent, and condensing apparatus is usuallyrecommended which will produce a vacuum »of about 28 ins. ofmercury, or 2 ins. to 21? ins. higher than that regarded as the mostefficient for reciprocating engines. The type of apparatus generallyinstalled consistsof a surface condenser with a centrifugal cir-culating pump, dry vacuum pump and hot-well pump. In practice. TURBINE ROOM, OUINCY STATION, OLD COLONY STREET RAILWAY COMPANY pany, the writer is permitted to publish some information regard-ing the performance of this station. This information was kindlyfurnished by C. F. Bancroft, superintendent of motive power andmachinery. It should be stated at the outset that this station, which willeventually furnish power for that portion of the Old Colony StreetRailway Companys system, extending from Quincy on the north tothe city of Fall River on the south, is not yet in full connection with the latter city, where a large part of the currentis to be used, has not yet been made, so that at present it furnishespower for only about one-third of the number of cars which it willeventually drive. Only two of the five turbines in the station arerequired for this work. One of these machines is run for 17 hoursper day, and two for 24 hours per day. When the station is in fulloperation there should be a more uniform l
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
