. Western electrician . e boilers and direct-connected enginesand dynamos, is .7 cent per kilowatt hour, while at fullloadthe cost is reduced to .6 cent per kilowatt hour. It may beadded that the maximum efticiency is reached when a unit(engine-dynamo) is about 10 per cent, overloaded, althoughbefore cutting in an extra dynamo the overload is permittedto reach 30 per cent, above the rated capacity. This is duemainly to the increased efficiency of the engine at full oroverload as compared with half or three-quarters load. Theprobable cost of current, including operation and mainte-nance of stat
. Western electrician . e boilers and direct-connected enginesand dynamos, is .7 cent per kilowatt hour, while at fullloadthe cost is reduced to .6 cent per kilowatt hour. It may beadded that the maximum efticiency is reached when a unit(engine-dynamo) is about 10 per cent, overloaded, althoughbefore cutting in an extra dynamo the overload is permittedto reach 30 per cent, above the rated capacity. This is duemainly to the increased efficiency of the engine at full oroverload as compared with half or three-quarters load. Theprobable cost of current, including operation and mainte-nance of station and distribution system, is 2 to 2/4 centsper kilowatt hour. The use of the fuel oil and the newstation equipment saves the company, as stated, $60,000per year, as compared with the operating expenses of theold Adams street station, at which coal was burned. Theoil expense is equivalent to coal at $ per ton. Themaximum load of the station is about 25,000 amperes at 140volts I. From the London Electrical electric SWITCHING LOCOMOTIVE. are many points, curves and crossings. The system con-sists of two wrought iron bars placed about six feet apart,one of which is always rubbing on the under surface of theoverhead wire. This system is controlled by Mather &Piatt and has lately been used on an extended scale on theDouglas and Laxey electric tramway. As the locomotive is only required for two or three hourseach day at odd times, it will be at once seen that a verygreat saving is eftected by using an electric locomotive inplace of steam, as the generator is simply started wheneverit is required. As an ordinary laborer looks after the entireplant, including an overhead electric traveling crane, sup-plied by Mather & Piatt, to lift three tons, and workedfrom the same generator as the locomotive, the cost for at-tendance is also small. 54
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