Pacific service magazine . f apparatus, except the master key at the lower right hand corner,which transmits the motivating power im-pulse when it is desired to change thestatus of a piece of the controlled equip-ment. The key to the left of the mastercontrols the alarm gong, which rings analarm when a machine is shut down or afeeder switch opened by a protective de-vice. Near each of the other keys arethree lights, white, green and red in of these three lights is lighted at alltimes, indicating the condition of the ap-paratus in the distant station. The greenlight indicates that the
Pacific service magazine . f apparatus, except the master key at the lower right hand corner,which transmits the motivating power im-pulse when it is desired to change thestatus of a piece of the controlled equip-ment. The key to the left of the mastercontrols the alarm gong, which rings analarm when a machine is shut down or afeeder switch opened by a protective de-vice. Near each of the other keys arethree lights, white, green and red in of these three lights is lighted at alltimes, indicating the condition of the ap-paratus in the distant station. The greenlight indicates that the switch is open; thered light indicates that it is closed; while awhite light flashing up indicates that some-thing is wrong, usually that the last direc-tion has not been followed and that anotherattempt should be made to accomplish thedesired object. To start the motor-generator, the operatorfirst assures hmiself that the green light isburning, which means that the apparatus isin condition to be started. He turns the key. Feeder switchboard at Station E, forlocal distributive purposes. 386 Pacific Service Magazine marked Motor GeneratorSet No. 2 to the Onposition and closes themaster switch to apply thenecessary current. Thisaction closes a switch whichcauses various electricalcircuits to be completed,many coils to be energized,until the great motor andgenerator are rotating atthe required speed and areautomatically connected tothe outgoing line. Almostimmediately, within threequarters of a minute, infact, the red light flasheson, indicating that theswitch is closed and thatthe machine is runningand ready to supplypower. We have seen how themachine is started in an-ticipation of a load, howit automatically carriesenough to supply thepower necessary to movethe interurban trains. Sup-pose now that a trolleywire has fallen and theline has become short-circuited, or grounded,and that the machine isin danger of burning out. On the oc-currence of the short circuit, the currentflow
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