American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 295
AN TELEGRAPHY. closed automatically, when the polar relay is open, as in the figure, by a short circuitand the local battery, lb, through the lever and tongue of the repeating transmitter.The branch office operates the pole-changer when kt is closed; the same way as in the Downer arrangement.… … CARDANIER QUADRUPLEX—SHORT-WIRE REPEATER. It is, perhaps, more especially used for this purpose in emergencies, as when, forinstance, one of the legs of a two-wire loop connection, from a duplex to a branchoffice, gets into trouble. In such a case, unless a repeating arrangement is put in at…
Telegraph
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