Question
what part of the telegraph is the telegraph key?
Answer
<DIV>The telegraph key is the part that you touch with your finger. It works pretty much the same as a doorbell button. </DIV>
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<DIV>When you depress the key with your finger, two electrical contacts touch, completing an electric circuit. Current then flows in the circuit. This current operates an electric solenoid (electro-magnet) that attracts a small iron plate. The plate makes a
