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 40
ncludes the electromagnet the arma-ture is attracted, this releases the latch and the shutter drops. Indropping it displays a number, letter or inscription which indicatesthe locality of the push-button or other circuit-closing device.Often annunciators are connected in circuit with a bell.… … Fig. 16. Annunciator Detaching Mechanism.character or inscription, indicating whence the call was sent. Annunciator, Gravity Drop. An annunciator whose opera-tions release shutters which fall by gravity. Annunciator, Needle. A needle annunciator is one whoseindications are given by the movements of…
Electricity
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