International Library of Technology · Scranton, International Textbook Co. · leaf 499
designed that it does notactually pull the switch outuntil the pressure reaches60 pounds per square inch.The switch is pulled out by aspring that snaps it out to avoid any arcing. When thereservoir pressure is below 50 pounds, the piston in C,Fig. 73, is at the lower end of its travel and the… … Fig. 74. 79. This arrangement alone would constitute a gov-ernor, for the pump is started when the pressure reaches § 25 ELECTRIC RAILWAYS. 63 normal value. But the Standard people do not approve ofstarting even a series motor at frequent intervals, by placingit dead across the line without any…
Electrical engineering
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