MARINE ENGINES.

499

when once set in motion they work pretty well, but on the wholenot so steadily as in the intermediate position. The air pump and

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Fig. 375.—Compound Marine Engines, by Fawcett, Preston, & Co., Liverpool, fitted onboard the Screw-ship “Itata.” Sectional Side Elevation.

circulating pump are worked by rocking levers for large power;while for small power, eccentrics are used to give motion to thepistons of the pumps.