American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 60
^ ^ I ^ ^ … 42 AMERICAN TELEGRAPHY. potential. The circuit then, from ^i,passes through, in the same way, the armaturesof c and D, still further increasing the e. m. f., which is utilized as in the cases of aand B. It is evident that machine a must furnish a larger amount of current than any ofthe other…
Telegraph
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