A dictionary of electrical words, terms and phrases (1898)
Houston, Edwin J. (Edwin James), 1847-1914 · New York, The W. J. Johnston company · leaf 438
Pump, Air, Mechanical •A mechan- ical device for exhausting or removing the airfrom any vessel. An excellent form of air pump is shown in Fig.455, which is a drawing of Bianchis pump. Three valves, all opening upwards, are placed- Pum.] 428 [Pjr. … Fig. 455. Barrel ofBianchVs Air Pump. at the top and bottom of the cylinder, and in thepiston, respectively. These valves are mechan-ically opened and closed at the proper momentby the movements of the piston, i. e., their actionis automatic. This enables a much higher vacuumto be obtained than…
Electricity · Electrical engineering
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