The stops, T1 T2, are small, adjustable collars, kept tightly in place on
R1 by screws.
Setting the Striker.--Assemble all the parts. Pull out the piston rod as
far as it will go, and push the slide valve right back. Loosen the striker
and the forward stop, and slide them along in contact until the striker is
close to the pump. Tighten up their screws. Then push the piston rod fully
in, draw the valve rod fully out, and bring the rear stop up against the
striker, and make it fast. Each stop may now be moved 1/16 inch nearer to a
point halfway between them to cause "cushioning" of the piston, by
admitting steam before the stroke is quite finished.
A pump made by the author on this principle, having a 1-1/4 inch stroke and
a 1/2-inch bore, will deliver water at the rate of half a gallon per minute
against a head of a few feet.
Note.--To steady the flow and prevent "water hammer," a small air-chamber
should be attached to the delivery pipe.
An Alternative Arrangement.--If the reader prefers a steam pump which
will work at slow speeds, and be available, when not pumping, for driving
purposes, the design may be modified as shown diagrammatically in Fig.
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