Ripper, William, 1853-1937 · London, New York [etc.] : Longmans, Green and co. · leaf 471
e requires that the heat in the condensed steam should be con-served in every possible way in order to return it as boiler feed at thehighest possible temperature. In order to deal with the opposing principles of a hot boiler feedon the one hand, and a high air-pump efficiency on the other,… … UMP auCTroN BECULATtNC VALVE Fig. 475. To the dry-air pump a cold injection is applied, thereby increasing thedensity of the air and enabling the pump to withdraw a greater weightof air per stroke, or permitting a reduction of air pump dimensions. Fig. 474 illustrates a dual air pump made by…
Steam-engines
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