The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 141
Fig. 124 It is necessary that the latter be of a fairly high capacity,one of 2 to 25 microfarads being generally employed. t»an Skitter … L 9 Fig. 125 When the receiver is taken off its support, the loop is com-pleted through the transmitter and receiver, the current forworking being supplied from a constant source at the central SUB-STATION INSTRUMENT CONNECTIONS 119 office (or CO.). For speaking purposes, however, this methodis not…
Telephone
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