. The street railway review . s we have described, thereis no tjuestion as to the economy in favor of the battery. Application of Battery to Power House. This form of installation has not become very generally appreciatedin this country, and but few installations have been made. As itsadvantages become better known, 1 feel confident the practice willbecome more general. The wide fluctuations in load in railway power houses are nowwell known. The average daily load varies from 50 per cent of themaximum in small stations to 70 per cent of maximum in the largeststations. From a very large number
. The street railway review . s we have described, thereis no tjuestion as to the economy in favor of the battery. Application of Battery to Power House. This form of installation has not become very generally appreciatedin this country, and but few installations have been made. As itsadvantages become better known, 1 feel confident the practice willbecome more general. The wide fluctuations in load in railway power houses are nowwell known. The average daily load varies from 50 per cent of themaximum in small stations to 70 per cent of maximum in the largeststations. From a very large number of observations in all parts ofthe country 1 find that in the majority of stations the average load isvery close to two-thirds of the maximum load. Now it is also a wellknown fact that the maximum economy of the steam engine existsfor a very small range of load, and that on each side of the point ofmaximum economy the efficiency falls off; rapidly on the overload,somewhat less rapidly on the underload. The result is FIO. 10. —HEAVY LINE SHOWS OUTPUT OF FOUR GENERATORS WITHOUT LINE SHOWS OUTPUT OF THREE GENERATORS WirH TRANSIT CO., EASTON, PA. In most stations the engines at the best have an average load ofonly two-thirds their most efificient load, and as a consequence con-sume over lbs. of coal per kilowatt-hour. With badly regulated engines, and especially with water powerplants, the changes in load are accompanied by variations in speedand consequently in voltage. These troubles may be entirely cor-rected by Installing a battery. The battery in this case becomes distinclly a load regulator. Kigs,8 and 9 show results obtained at Woonsocket, which is a water powerplant. In Kig. 8 the load is carried entirely by the generators, andas is to be expected, the potential curve is very irregular, varyingalmost 100 volts, while the current variiS from o to 250 action of the battery is shown in Kig. 9, where the generator load\a
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