A dictionary of electrical words, terms and phrases (1896)
Houston, Edwin J. (Edwin James), 1847-1914 · New York, The W.J. Johnston company · leaf 66
call for any particular one of these four servicesthe handle is pulled until it comes opposite to theletters indicating the required service, and is thenreleased. The service required is then indicatedat the receiving, or central station, through thevarying signals sent over the line by the… … Fig. 5Q. Fire-Alarm Signal-Box. on the same principle as the district call box. Themovement of the handle in the direction of thearrow drives a wheel that makes and breaks acircuit at certain intervals. The fire-alarm signal boxes are connected Box.] 55 [Box. either with a central station, cr with…
Electricity · Electrical engineering
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