114.
The striker becomes a cross head, and is connected by a forked rod passing
on each side of the pump with the crank of a fly wheel overhanging the
base. The valve is operated in the ordinary manner by an eccentric on the
crankshaft. The steadying effect of the fly wheel and the positive action
of the valve make it possible to use a larger pump plunger than is
advisable with the striking gear. With a pump piston of considerably
greater diameter than the piston rod, the pump may be made double-acting, a
gland being fitted at the front end for the piston rod to work through,
and, of course, a second set of valves added.
[Illustration: Fig. 114.--Plan of steam pump with fly wheel.]
A SUGGESTION.
For exhibition purposes a small, easily running, double-action pump might
be worked by the spindle of a gramophone. A crank of the proper throw and a
connecting rod must be provided. Both delivery pipes feed, through an
air-chamber, a fountain in the centre of a bowl, the water returning
through an overflow to the source of supply, so that the same water may be
used over and over again.
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