The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 133
(jg ® ®^--4)S(^)T^) Fig. 113bell, showing the various parts in their relative positions. … Fig. 114Between the two pairs of terminals at the bottom, marked SUB-STATION INSTRUMENT CONNECTIONS m T t, one or two receivers may be connected ; if the latter theywill be connected in parallel. Between the p pair the primarycircuit of the transmitter is connected—one to one end of theinduction…
Telephone
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