A dictionary of electrical words, terms and phrases (1898)
Houston, Edwin J. (Edwin James), 1847-1914 · New York, The W. J. Johnston company · leaf 312
key for sending an electric impulseinto a line, so arranged that a coil of wire onan armature connected with the key lever is,by the movements of the key, moved towardor from the poles of a permanent magnet, themovements of the key thus producing thecurrents sent into the line. Key, Plug A simple… … Key, Reversing A key inserted in the circuit of a galvanometer for obtainingdeflections of the needle on either side of thegalvanometer scale. A form of reversing key is shown in Fig. 328.The galvanometer terminals are connected to thebinding posts 2 and 3, and the circuit terminalsto the other two…
Electricity · Electrical engineering
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