engines must be made by hand, but after a few turns of the fly-wheel the motion acquired is maintained by the engine.
The engine is supplied with either a deep well-pump, or one for use when the water is not more than twenty or twenty-five feet below it. The former is a simple contrivance, tubular in form, so that it can readily be inserted in artesian wells. The pump for use with water at less depths is of special construction, provided with rolling valves. It is bolted to the cooling cylinder, and worked directly from the compression piston or plunger. With one or the other of these pumps the motors can be adapted to every variety of circumstance in which water is to be drawn from one point and conveyed to another. Houses in the country can have as complete a water-supply, and have it in as convenient a shape, as those in the city, and at but little greater cost.
One of the best of this class of motors made for power purposes is the Sherrill-Roper engine, shown in section in Fig. 11. The manner