These are inverted over a beam, or rocker; and the pistons are
connected to opposite ends of the same.
The beam attachment of the main connecting rod is made to a pin located
above and midway between the pins for piston connections.
The main center of the beam and the crank shaft have their pedestals in
the same horizontal plane. The throw of the crank is five feet. There are
two differential plunger pumps, having upper plungers 20 inches in
diameter, and lower plungers 33 inches in diameter, with a stroke of 5
feet. These pumps are vertical, and placed beneath the engine bed-plate,
to which they are attached by strong brackets. The pump under the low
pressure cylinder is worked directly from its cross-head by an extension
of the piston rod. The other pump is worked by a trunk connection from
the opposite end of the beam. The radius of the beam is but fifty inches,
but the connections to it are made very long by links.
The lower plungers work through sleeves in diaphragms located in the
center of the pumps. In these diaphragms, the openings for the delivery
valves are made. These valves are similar in construction to those
previously described for the horizontal plunger pump.
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