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THE POWER PLANT
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either direction and under variable load without adjust-
ment of the brushes. A potential difference of about 70
volts is allowed at the field terminals to provide for speed
regulation when running as a motor and for adjustment
Main Motors, Submarine G-i. Main engines in background, forward of
motors
of voltages when running as a generator. I hey are
often run at an overload of as much as ninety per cent
without injurious heating.
The first controls to be used were plain knife switches.
These are now all enclosed to eliminate the danger of
sparking, and in some cases oil baths are provided. The
starters for the main motors are of the contactor type
master drum control with interlocking features. 1 his