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THE POPULAR SCIENCE MONTHLY.
is usually expanded from four to eight times. The Leavitt compound engseine is shown in Fig. 21.
Fig. 21.—Leavitt's Pumping-Engine, 1875.
In this engine the lower ends, A, B, of the two cylinders are brought close together under the centre of the beam, thus shortening
Fig. 22.—The Worthington Compound Pumping-Engine, 1870.