Steam engines, a thorough and practical presentation of modern steam engine practice (1920)
Ludy, Llewellyn V., 1875-, American Technical Society · Chicago, American technical society · leaf 141
124 STEAM ENGINES the exhaust steam could be condensed instantly, the back pressurewould be reduced almost to zero and the engine would exhaust intoa vacuum. Unfortunately the mere condensation of the steam will not givea perfect vacuum because of the air, always present in the water^which comes… … Fig. 76. Section of Steam Condenser of the Surface Tyi>e it not for the air pump, which removes the air and condensed steam.Even with the best air pump it would be impossible to maintain aperfect vacuum, but a vacuum of 26 inches, which corresponds toabout 2 pounds absolute pressure, can readily…
Steam-engines
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