The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 236
ded foreach sub-station. As far as the central office arrangements are concerned,this system was the germ of what is now the most extensivelyused C.B. system—viz. that employed by the National Tele-phone Co. in this country and by the various Bell TelephoneCompanies in America. Instead, however, of… … Fig. 236 single repeater or translator, with four equal windings, asshown in Fig. 236, which gives the connections of a moremodern C.B. system, where relays replace the calling andsupervisory drops or annunciators. These relays, whenoperated, cause the lighting of the calling (C.L.) and…
Telephone
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