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THE GROWTH OF THE STEAM-ENGINE.
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economy in working steam in this manner, it seems gradually displacing all other forms of engine.
Fig. 19.—Hornblower's Compound Engine, 1781.
44. An example of this form of pumping-engine, and one which is a favorite with many engineers, is the beam and crank engine (Fig. 20),
Fig. 20.—Compound Pumping-Engine, 1800.
C D, E F, with double cylinder, A, B, working the "combined bucket and plunger," or double-acting pump, J. In its cylinders steam
