American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 335
and batteries connect the two conduc-tors at each end, as shown, forming a Wheatstone bridge arrangement, of which theresistances a b and a b are arms. From what has already been stated relative to duplex telegraphy, it will be evi-dent that, if the resistance of the conductors c c from x to^, and… … toJWi may be sent from k to e and k to e, without affeuimg the relays r or r\ in the bridgewires. On the other hand, the effect of opening and closing the key k or k\ inthe bridge wires, will be to operate the relays r or r\ practically as if they were in ametallic circuit disconnected from the…
Telegraph
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