Fig. 240 is intended to show the application of the electric motor
to a triplex pump of small size, the plungers being 3-1/8 inches in
diameter. The Stroke is 4-7/8 inches which gives a capacity of 108
cubic inches per revolution, with a pressure of 50 lbs. to the square
inch. The pumps require about one-half horse power applied at the motor.
[Illustration: FIG. 240.]
The high speed of the motor is reduced by two belt pulleys and two
chain wheels. These pumps may be worked independently to produce
pressure or vacuum as desired by a separate pipe for each pump.