MARINE ENGINES . 421 under notice , whether fitted with an internal plunger or a simple piston , is of the double - acting type , and is worked directly off the steam piston by means of a rod connected to it , having packing … ends . Doors for the foot Fig . 304 . — Air Pump with Condenser outside and Discharge Chambers at centre . valves are fitted at each end , a , Condenser . b , Hot well , c , Foot - valve seat . one of which forms the cover , d , Head - valve seat . ee , Guide bars , f , Air pump . and the other is…
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