American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 254
300- Fig. i69<5.^00+ ^ 2_„. 300+ .^: Z40200 tooA X ^ V ■.jy / ML V. R … /F 212(5 * AMERICAN TELEGRAPHY. discharge may be indicated by the solid sloping lines f and r\ Fig. 169^*, in whichcase the main-line terminal of li is at the higher 23oint of potential, and a current stillflows from right to left in that relay. Hence the combined effects of the distantbattery and…
Telegraph
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