American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 292
the same general way, for repeating, the only difference being that the contactpoints of the repeating sounder, instead of those of the neutral relay, are made thedirect means of operating the opposite single transmitter. This is shown in Fig.185, which, in view of what has been described, will not… … EXTENSION OF DUPLEX OR QUAD. LOCALS TO BRANCH OFFICE. first side of each quad set is caused to repeat into the first or into the second sideof the other set, according to the wishes of the powers that be. There has been C44 AMERICAN TELGRAPHY. some difference of opinion as to which is the better…
Telegraph
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