The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 246
the lines connected. To make sure that the register works correctly a registerlamp is included in the circuit with the register key. Thislamp does not glow until the armature of the register magnethas been attracted, when a contact is made which cuts in asecond low-resistance winding of the… … — C fcb 222 PRACTICAL TELEPHONE HANDBOOK Operators Cord Circuit.—Fig. 243 gives the full workingconnections of an operators cord circuit on an ordinarysubscribers section of a C.B. switch-board. In addition tothe parts shown in Fig. 241 there are the register key andlamp already described ; another…
Telephone
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