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172. Description of the PA-1 Loudspeaker Switching Panel. -At the bottom of one rack is a loudspeaker switching panel. The corresponding panel at the bottom of the other rack is blank. The switch in the upper left-hand corner is for switching the speakers from one amplifier to the other. The switch in the upper right-hand corner is for switching the speakers "on" and "off." The row of switches at the bottom of the panel are for switching the speakers "on" and "off" separately or in groups.

173. PG-1 Motor-Generator Sets. -The four unit motor-generator sets used with PG-1 equipments are described in section 36.

174. Storage Batteries Used with the PG-1 Equipment. -Two Type XCR-19 storage batteries are used with each motor-generator set. These batteries are connected in series to give 12 volts and are connected across the 15 volt generator. The ammeter on the metering panel indicates the battery current, a reading to the right of mid-scale indicates that the battery is charging, and a reading to the left indicates that the battery is discharging. The purpose of the battery is to filter out the ripple of the DC voltage from the 15 volt generator and is not used to supply current to the amplifier, but it should be kept charged at all times. See section 51.

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