St. John, Thomas M. (Thomas Matthew), b. 1865 · New York, T. M. St. John · leaf 90
e station to the other, and the return may be through thewire, R \V, or through the earth; but for short lines awire is best. 112. Operation of Simple Line. Suppose two boys,R (right) and L (left) have a line. Fig. in shows thatRs switch, E, is open, while e is closed. The entirecircuit, then, is… … Fig. III. 88 THB ELECTRIC TELEGRAPH. S and s come down with a click at the same time. Assoon as the key is raised, the armatures lift and makethe up-click. As soon as R has finished, he closes hisswitch E. As the armatures are then held down, L,knows that R has finished, so he opens his switch e,…
Electricity
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