St. John, Thomas M. (Thomas Matthew), b. 1865 · New York, T. M. St. John · leaf 92
ELEGRAPH. 89 its armature. L W and R W represent the line andreturn wires. R A will vibrate toward E every time Kis pressed, and close the local circuit, which includes alocal battery, L, B,- and a sounder. It is evident that assoon as K is pressed the sounder will work with a goodstrong click, as… … Fig. 113. instead of sounders. Fig. 114 shows a writing registerthat starts itself promptly at the opening of the circuit,and stops automatical!} as soon as the circuit returns toits normal condition. A strip of narrow paper is slowlypulled from the reel by the machine, a mark being madeupon it…
Electricity
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