Page:Popular Science Monthly Volume 12.djvu/157

Rh economy in working steam in this manner, it seems gradually displacing all other forms of engine.



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),



C D, E F, with double cylinder, A, B, working the "combined bucket and plunger," or double-acting pump, J. In its cylinders steam