Fig. 244.
The pump and motor shown in [Fig. 244] are mounted on an iron truck, no wood whatever being used in construction, so that adjustment cannot be affected by moisture and an easy running and durable pump is assured. The pumps are made as compact and strong as possible for mine service, which is usually exceptionally rough and continuous. They are of the horizontal type which is best adapted for low passageways and are designed so as to afford easy access to all parts. The pumps are single acting and the plungers are provided with outside stuffing-boxes, which can be packed, and being in sight, any leakage can be quickly detected. Access to all valves is made easy by the removal of one large hand-hole cover on the valve chest.
THE STEAM
PUMP
Fig. 245.
G.KIRKHAM
THE STEAM PUMP.
The illustration, [Fig. 245], on the opposite page represents the first practical steam pump ever made; on [pages 67-69] will be found an interesting account of it. The water end is single acting; the steam end is, of necessity, double acting to produce the reciprocating motion. From this original design has been evolved the piston valve as well as many other designs of valve motion for pumps.
Having already taken up in some detail the construction of “the parts of the pump” and the necessary appliances connected with its use, it now remains to consider the means by which the steam power generated is made available and the mechanism by which the energy is transformed from pressure into pumping power.