Baille, Jean Baptiste Alexandre, b. 1841, Armstrong, John W., ed · New York, Scribner, Armstrong, and co. · leaf 63
the place of the ex- 44 WONDERS OF ELECTRICITY. hausted current coming along the line, and to sub-stitute for it a stronger current, furnished by a localbattery. This local battery should always be suffi-ciently powerful to set the signal apparatus inoperation. The wire of the line communicates… … Theory of the Kelay. local battery. In repose, when the armature is notattracted to, and therefore not in contact with theelectro-magnet, the circuit is interrupted; but assoon as the electricity of the line, however feeble itmay be, penetrates the electro-magnet of the relay,the armature is moved…
Electricity
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