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 39
netic subjects. Synonym—^lotropic. Annealing, Electric. Annealing by the heat produced by thepassage of the electric current through the body to be annealed.The object is clamped or otherwise brought into a circuit, and acurrent strong enough to heat it to redness, or to the desired temper-ature is… … Fig. 14. Annunciator. for announcing the entering of any given room or window in abuilding protected by a burglar alarm. A usual system comprises for each annunciator an electro-magnet.Its amiatiire is normally held away from its poles by a spring, andwhen in that position a latch connected to the…
Electricity
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