Hawkins electrical guide ... : questions, answers & illustrations : a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications ; a practical treatise (1914)
Hawkins, N. (Nehemiah), 1833-1928 · New York : T. Audel & Co. · leaf 372
t is free air? Ans. Air at ordinary atmospheric pressure and temperature,whatever these may be. NOTE.—In air compressor problems careful distinction should be made between gaugepressure and absolute pressure, the former being the pressure as indicated by a pressure gauge,as distinguished from… … Fig. 4,336.—Air compression characteristics; curves showing the thermal result of air com-pression and expansion. The simplest application of this diagram is that which gives thegauge pressure represented at different points of the stroke. This is shown in the verticallines. But in compressing air,…
Electrical engineering
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