A text book of physics, for the use of students of science and engineering (1918)
Duncan, John, d. 1941, Starling, Sydney George, 1873- · London Macmillan · leaf 1033
Fig. 948.—Duplex telegraph (Wheatstones bridge). The bridge method is employed for submarine cables. At one stationthe battery Bt (Fig. 948) is connected by means of the key to onecorner, Al5 of a Wheatstones bridge. The four arms of the bridgeare Pl5 Q,v the line L, and the resistance Rx. IUUS… … The current from the line on reaching B2 will pass to earth, partlythrough P2 and partly through G2, so that the signal is recorded atthis end. A similar bridge arrangement is at each end of the line,so that messages can be sent simultaneously in both directions. The galvanometer must be of a…
Physics
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