History, theory, and practice of the electric telegraph (1866)
Prescott, George B.(George Bartlett),1830-1894 · Boston, Ticknor and Fields · leaf 68
magnetic poles by means of a horizontalaxis passing between the branches of the magnet, and which isitself moved by means of a wheel. An endless cord, passing atonce round the circumference of the wheel and the groove of apulley fixed on the axis by its centre, serves to communicate mo-tion. The… … Fig. 29. At each passage there is magnetization, and consequently a devel-opment in the ambient wire of two induced currents in contrarydirections. Hence it follows, that in all there are four currentsin each of the two wires for one complete rotation of the wheel.If we compare each induced current…
Telegraph
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