Learn how a Telegraph Machine Works in this educational video from dizzo95.
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Male Speaker: When the key is depressed the electric circuit between the key and the receivers complete it the current energizes the electromagnet in the receiver this energy attracts a lever lifting an into roller on the other end to press against the passing paper strip. As long as the key is depressed the electric circuit will be maintained and the roller will press against the paper. Breaking the circuit allows the roller to fall away from the paper, holding the key down for a longer period creates dashes on the paper for shorter periods dots allowing the visual transmission of a Morse code signal.