The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 230
ll the bushes T of that number are therebyconnected to earth, and will give the test click in the operatorsreceiver when the tip of the plug is touched on to it, as shownin Fig. 229. As previously mentioned, it is necessary to lock SWITCH-BOA RDS—MA GNETO-BRA NCHING 205 the line indicators, and… … to_ R E_STORJ_N GCOILS Fig. 230 also of the self-restoring type, as shown in Fig. 230, which givesthe cord connections, old-pattern separate ringing and speakingkeys being shown. There will thus be three drop coils con-nected as shunts when two lines are connected to each other,but as these are of…
Telephone
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