A dictionary of electrical words, terms and phrases (1896)
Houston, Edwin J. (Edwin James), 1847-1914 · New York, The W.J. Johnston company · leaf 35
Ann.] 23 [Ann, 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. … Fig. lb. Gravity-Drop Annunciator. A form of gravity-drop annunciator is shownin Fig. 16. The armature mechanism for therelease of the drop will be understood by an in-spection of the drawing. Annunciator, Hotel An annun-ciator connected with the different rooms of ahotel. A hotel-annunciator is…
Electricity · Electrical engineering
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