A dictionary of electrical words, terms and phrases (1898)
Houston, Edwin J. (Edwin James), 1847-1914 · New York, The W. J. Johnston company · leaf 437
ns being allowed toescape through anopening governed bya stopcock. The ves-sel to be exhausted isconnected with thebulb, and by meansof a two-way exhaus-tion COCk, COmmuni- Fig. 454. Geisslers Mer-cation can be made curial Air Pump. with the bulb, when it contains a Torricellianvacuum, and shut off… … 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.
Electricity · Electrical engineering
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