110. The plate, F,
of the pump is screwed to a wooden base resting on a framework of bent
sheet zinc, which is attached to the bottom of a zinc water tray. The
delivery pipe, G, will be protected against undue strains if secured by a
strap to the side of the wooden base.
The same pump is easily adapted to be worked by a lever, which makes the
work of pumping easier. Fig. 111 gives details of the top of the plunger
and the links, B. A slot must be cut in the plunger for the lever, A, to
pass through, and the sides bored for a pivot pin. The links are straddled
(see sketch of end view) to prevent the back end of the lever wobbling from
side to side.
[Illustration: FIG. 111.--Details of lever for force pump.]
A Steam Pump.--The pump illustrated in Fig. 112 belongs to what is
probably the simplest self-contained type, as no fly wheel, crank, or
eccentric is needed for operating the valve.
The steam cylinder and the pump are set in line with one another (in the
case shown, horizontally), and half as far apart again as the stroke of the
cylinder. The plunger is either a continuation of the piston rod, or
attached to it.
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