Text-book of general physics, for the use of colleges and scientific schools (1899)
Hastings, Charles Sheldon · Boston: Ginn & company · leaf 140
t AIR PUMP. 129 the liquid to the chamber N, whence it is forced out throughthe discharge pipe Q by the pressure of the air confined in theupper part of the chamber. 97. Air Pump. — The pumps used to exhaust a vessel ofair do not differ materially in their mode of operation fromthe one shown in… … Fig. 86. greater than that above. In this case it is necessary, how-ever, that the valve A shall have a positive motion witheach stroke of the piston. This is effected by fastening tothe conical plug A a rod, B, which slides through D with acertain amount of friction, so that A moves a short…
Physics
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