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The Key

المؤلف:  GEORGE A. HOADLEY

المصدر:  ESSENTIALS OF PHYSICS

الجزء والصفحة:  P-371

2025-12-10

507

is simply a circuit breaker put in the main line, and so arranged that the current is sent every time the lever K (Fig. 1) is pressed down. When the key is not in use for sending messages, the switch S is closed, making contact so that messages can be received.