. Electric railway journal . s with a temperaturerise not exceeding 55 deg. C. Theefficiencies are as follows: driving the set from the main storage battery in case of totalshut-down of the Edison lines. In this manner one-half of thetunnel lighting, a small amount of pumping, signal lights and Guaranteed 91 Test 9. FullLoad. 94 95-3 The direct-current machines areshunt-wound units designed to operatein parallel with the storage have commutating poles and alsoauxiliary shunt fields which are sepa-rately excited from the storage batterybooster an
. Electric railway journal . s with a temperaturerise not exceeding 55 deg. C. Theefficiencies are as follows: driving the set from the main storage battery in case of totalshut-down of the Edison lines. In this manner one-half of thetunnel lighting, a small amount of pumping, signal lights and Guaranteed 91 Test 9. FullLoad. 94 95-3 The direct-current machines areshunt-wound units designed to operatein parallel with the storage have commutating poles and alsoauxiliary shunt fields which are sepa-rately excited from the storage batterybooster and play an important part inthe scheme for regulating the auxiliary winding is of suchstrength that when the generator isoperating under normal load at 650volts the voltage can be raised to 700or reduced to 575, so that it can be used for either charging or discharging the battery. The regu-lating devices will be considered in fuller detail in the latterpart of the present article. These motor-generator sets are seen. Fig. 10—Detroit Tunnel—Main Switchboard signal track transformers can be operated, while the railwayload would be carried on the main battery. The main items of interest in the auxiliary apparatus are :
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