. The Street railway journal . Sl. t ^d ThRRITORY OF THE BRONX TO BE SERVED BY KINGSBRIDGEOR 216TH STREET POWER HOUSE where alternating-current distribution is used, the invest-ment in a storage battery is a special saving,, because itdisplaces not only an ec[uivalent generating capacity at thel)Ower house, but also the rotary converters and transform-ers necessary to deliver that output to the line. The power factor which prevails on the system is notexactly known in the absence of the power factor indi-cators, which we hope soon to liave, but it is believed to bevery near unity. Wh
. The Street railway journal . Sl. t ^d ThRRITORY OF THE BRONX TO BE SERVED BY KINGSBRIDGEOR 216TH STREET POWER HOUSE where alternating-current distribution is used, the invest-ment in a storage battery is a special saving,, because itdisplaces not only an ec[uivalent generating capacity at thel)Ower house, but also the rotary converters and transform-ers necessary to deliver that output to the line. The power factor which prevails on the system is notexactly known in the absence of the power factor indi-cators, which we hope soon to liave, but it is believed to bevery near unity. When rotary converters are installed theyare tested to determine at what field strength they giveunity power factor, and they are then run at that fieldstrength constantly. It is possible that at times leading orlagging currents occur at a number of sub-stations at the. I:llr,M. 4:20 Blrnl VOLTAGE AND CURRENT RECORD TAKEN ON MADISON AVENUE, METROPOLITAN STREET RAILWAY October. 1901.] STREET RAILWAY JOURNAL. 419 same time enough to perceptibly vary the power factorfrom unity. The question of tlie efficiency of a polyphase distributionof this kind is one that has been the source of much specu-lation and argument. On our system we have been ablein every-day practice to come very near the rated efficiencyof the apparatus, as shown by full load acceptance system being so large, it was possible to install largeand efficient rotary converters (990 kw being the standardsize adopted), and at the same time to have rotary-con-verter units in sufficient number at each sub-station, sothat the number in use could be accurately adjusted to the 7,0001 1 ] \ \ \ \ 1 ] 3 per cent to 7 per cent on difTerent lines at various hoursof the day. It is the custom to read the recording wattmeters on allfeeders, both alternating and direct-current, every
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