The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 248
o the same line. In such party lines some ofthe magneto bells are connected only to the A wire, thesebeing for what are termed the X subscribers. Others areconnected to the B wire of the loop for the Y subscribers,the other ends of the magneto bells being earthed. Thereversing key is only needed… … Fig. 244.—Testing Connections simplifiedP 224 PRACTICAL TELEPHONE HANDBOOK
Telephone
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