. Electric railway journal . le, the battery iscut out while the car is laid up. The run to Croton is made in about seventy-eightminutes, and, including say twelve minutes in whichthe car is under power at the New York terminal, thecharging period may be said to be ninety minutes, orone and a half hours. During this time the batteriesare being charged at a rate of about amp, this beingbased on a third-rail voltage of 600 and a chargingvoltage of about volts per cell, giving a net voltageacross the 105 ohms resistance of 560. This gives abattery input, during the charging period, of
. Electric railway journal . le, the battery iscut out while the car is laid up. The run to Croton is made in about seventy-eightminutes, and, including say twelve minutes in whichthe car is under power at the New York terminal, thecharging period may be said to be ninety minutes, orone and a half hours. During this time the batteriesare being charged at a rate of about amp, this beingbased on a third-rail voltage of 600 and a chargingvoltage of about volts per cell, giving a net voltageacross the 105 ohms resistance of 560. This gives abattery input, during the charging period, of amp-hr. At an ampere-hour efficiency for the battery of90 per cent this is the equivalent of amp-hr. The battery supplies five 50-watt lamps and four 25-watt lamps, making a total of 350 watts for the batteryoutput. This at a voltage of 2 volts per cell, or 32 voltsfor the battery, gives a discharge rate of 11 amp. Asthe run from Peekskill takes about eighteen minutesand as there is an average lighting period during the. New York Central Car Lighting—Interior View of Car,Showing Auxiliary, Storage-Battery Lights AlongCenter Line of Ceiling 1256 ELECTRIC RAILWAY JOURNAL [Vol. XLIII, No. 23. lay-over of some six minutes in addition, the trips whenlights are required have a discharge period of twenty-four minutes. About half of the round trips made byeach of the twenty-one cars in the service to Peekskilloccur during the time of day when lights are required,so that the average daily discharge period per tripamounts to twelve minutes. In addition there is aperiod during the night when the cars are cleaned thataverages about eight minutes when prorated againsteach one-way trip made by the cars. Therefore thetotal discharge period per one-way trip averages twentyminutes, or hr., and at the discharge rate of 11 ampthe output of the batteries per trip amounts to amp-hr. The equivalent input per trip of amp-hr. ex-ceeds, in consequence, the output by 4 amp-hr. persin
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