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 384
TRICITY between strokes, and the air enters the cylinder cooler than in a singlestage compressor. The lubricant for cylinders and valves is not subjectto the pernicious influence of high temperatures; and the clearancelosses, or losses due to dead spaces, are less in a compound compressorthan in a… … Fig. 4,381.—Ingersoll-Rand Imperial unloader. It operates by closing the air intake, andautomatically regulates the compressor, maintaining the line pressure within a satisfac-tory range. It consists of a valve on the compressor intake pipe, normally held openby its own weight. When receiver…
Electrical engineering
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