The standard electrical dictionary : a popular encyclopaedia of words and terms used in the practice of electrical engineering (1898)
Sloane, T. O'Conor (Thomas O'Conor), 1851-1940 · London : Crosby Lockwood and Son · leaf 40
cludes the electro-magnet 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. IS-Drop Annunciator. Fig. i6. 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…
Electricity
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