. Electric railway journal . Metropolitan Electrical Department—Cables, Blowers andAir-Chamber Wall at 146th Street Substation replaced by a copper bus on insulators in brick compartments,isolating each bus by continuous soapstone slabs. CONTROL BATTERIES AND BLOWERS Control batteries of 15-amp capacity, to operate the large oilswitches and general control, have been placed in all substationsexcept at Ninety-sixth Street. The emergency lamps fed bythese batteries cut in automatically when a station stops, butonly enough lamps are installed to give the operator sufficient. Metropolitan Electric
. Electric railway journal . Metropolitan Electrical Department—Cables, Blowers andAir-Chamber Wall at 146th Street Substation replaced by a copper bus on insulators in brick compartments,isolating each bus by continuous soapstone slabs. CONTROL BATTERIES AND BLOWERS Control batteries of 15-amp capacity, to operate the large oilswitches and general control, have been placed in all substationsexcept at Ninety-sixth Street. The emergency lamps fed bythese batteries cut in automatically when a station stops, butonly enough lamps are installed to give the operator sufficient. Metropolitan Electrical Department—Air Chamber ofHouston Street Substation light to start after a shutdown at night. The time lost inci-dent to using oil lamps is thus eliminated. Primarily a controlbattery was installed to have separate means of operating appa-ratus, such as oil switches, etc., in the station during shutdowns, also to reduce the number of shutdowns due to disturbancestransmitted to the control circuits. Formerly a motor-generatorset was employed for control. This motor-generator was oper-ated from the power bus so that when the station or the motor-generator shut down there was no way to control the largerswitches. At such times the control circuits were switched toa certain number of cells of power batteries, but these were sub-ject to the same disturbances as the station and very oftencaused interruptions in the control system. New blowers of the Sturtevant turbine type have been in-stalled in the reconstructed substations because the transformerswere running at
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