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 344
Figs. 4,292 to 4,297.—Various types of rotary pump. Fig. 4,292 represents one of the oldestand most efficient forms of the rotary pump. Cog wheels, the teeth of which are fittedto work accurately into each other, are enclosed in an elliptical case. The sides of thesewheel turn close tothose of the…
Electrical engineering
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