The standard electrical dictionary; a popular dictionary of words, terms, and phrases, used in the practice of electrical engineering (1897)
Sloane, T. O'Conor (Thomas O'Conor), 1851-1940 · New York, H. W. Henley & co. · leaf 21
height. There are many types. Mercurial air pumpsare largely used for exhausting incandescent lamp chambers.Geissler Air Pump,—Sprengel Air Pump.) Air Pumps, Short Fall. A mercurial air pump in which thefall of mercury or the height of the active column is comparativelysmall. It is effected by… … Fig. 7. Burglar Alarm Switch ok Circuit Brrakrr. Alarm, Burglar. A svstem of circuits with alarm bell extend-ing over a house or apartments designed to give notice of the open-
Electricity
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