The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 235
eversingthe usual arrangement. Hayes System.—This system, patented in America in 1892by H. V. Hayes, appears to be the first really practicable sug-gestion for the use of a common battery for both sig-nalling and speaking. As shown on the right of Fig. 235at c, a condenser is interposed in the bell… … Fig. 235 in Chapter VII. On lifting the receiver, a complete circuitis formed for the C.B. current round the loop and throughthe annunciator or drop, CD., at the exchange, and thus anautomatic signal may be given. When two sub-stations werejoined for speaking, the connections would be as shown…
Telephone
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