American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 254
larduplex, putting the positive poleto the line, the positive batteryat A being to the line as before,the charge or potential on themain and artificial lines maybe represented by the dottedlines zz. In this case, the lineterminal of the relay is at thepoint of higher potential, theresult being that… … 300- Fig. i69<5.^00+ ^ 2_„. 300+ .^: Z40200 tooA X ^ V ■.jy / ML V. R
Telegraph
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