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 320
^,a polarized relay being used. In one very simple form a key ismounted on a base with a permanent magnet and connected to thearmature, so that when the key is pressed downwards it draws thearmature away from the poles of the magnet. If the magnet or itsarmature is wound with insulated wire this… … Fig. 208. Siemens Magneto-electric Key. In Siemens & Halskes key an H armature E is pivoted betweenthe poles TV 6, of a powerful compound horseshoe magnet, G G.It is wound with fine wire and a key handle H is provided forworking it. In its normal position the handle is drawn upward,and the end…
Electricity
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