CONSTRUCTION.
The cylinder will not be described in detail, as hints on making a
slide-valve cylinder have been given on earlier pages. The piston rod
should be three times as long as the stroke of the cylinder, if it is to
serve as pump plunger; and near the pump end an annular groove must be sunk
to take a packing.
The pump, if designed to work horizontally, will have the valves arranged
like the pump illustrated in Fig. 65; if vertically, like the pump shown in
Fig. 109. Both suction and delivery pipes should be of ample size, as the
pump works very fast. The pump is mounted on a foot, F, made by turning up
the ends of a piece of brass strip, and filing them to fit the barrel.
The bed can be fashioned out of stout sheet brass or zinc. Let it be of
ample size to start with, and do not cut it down until the pump is
complete. Rule a centre line for cylinder and pump, and mount the cylinder.
Pull out the piston rod plunger as far as it will go, and slip the pump
barrel on it. The foot of the pump must then be brought to the correct
height by filing and spreading the ends until the plunger works quite
easily in the pump, when this is pressed down firmly against the bed.
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