American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 64
olarity, respectively; the third is a spare series,which, by means of a reversing switch may be caused to develop positive or nega-tive ]3olarity as required. The manner in which this change is effected is shown in Figs. 27 and 28, inwhich figure but two machines of the spare series are shown, they… … 3fecckuie3 A^, respectively. Tlie wires from the 5th machine are led to a a^. The bars b b^,are rigidly connected together by an insulated cross-bar and handle s, by means ofwhich those bars may be turned over on their pivots, or hinges A a^, from the lowerstrips, 2 and 4, to the upper strips, i…
Telegraph
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