A dictionary of electrical words, terms and phrases (1898)
Houston, Edwin J. (Edwin James), 1847-1914 · New York, The W. J. Johnston company · leaf 32
Annunciators are general-ly operated by electro-mag-netic attraction or repulsion,and are therefore some-times called electro-magneticannunciators. Fig. 14 shows an annun-ciator suitable for use inhotels. The numbers 28 and 85are represented as havingbeen dropped by the closingof the circuit… … Ann.] 23 [Anil, Annunciator, Fire-Alarm An annunciator used in connection with a systemof fire-alarms. Annunciator, Gravity-Drop —An annunciator whose signals are operated bythe fall of a drop.
Electricity · Electrical engineering
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