Brechner, Claude H., 1887- [from old catalog] · Boston, New York [etc.] Allyn and Bacon · leaf 178
Figure 162. — Wiring Diagram ofTelegraph Sounder. When a current is sent through the coils C, C by attach-ing a battery at A and B, these coiJs become magnets andpull the soft iron bar down until it strikes the screw E, THE TELEGRAPH SYSTEM 167 … Figure 163. — Photograph of theTelegraph Sounder. making a slight sound. The bar is held in this position aslong as the current flows; but as soon as the current stops,the coils lose their magnetism, and the bar flips back to D,making a loud click. Bymeans of these sounds,the operator is able…
Physics
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