American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 236
tion with Fig. 160, so that, when the smaller portionof the battery is placed to the line its armature will be withdrawn by the , retractilespring, we can see that, in Fig. 161, the relay ne will be open, and the position ofthe armature of the polar relay will depend on the direction of the current… … ■HwWr/ placed to the line. The result is that the armature of nr is attracted. As, how-ever, the pole-changer has not been opened, the polarized relay has not been affect-ed. It will be observed, however, that should the pole-changer be operated now, itwill reverse the enfire battery. The relays kr…
Telegraph
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