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It transmits messages through a wire by sending an electrical pulse through it. the operator sending the message will determine whether the signal will be long or short which are called dots and dashed. if the telegraph button is held down long, it continues to send a signal to the other end of the wire which powers some kind of signaler such as a bell or a beeper or is hooked to a teletype machine and prints out the dots and dashes but that is very complex and far from the simple telegraph. now a days Morse Code can be transmitted through the internet in text files or pretty much by any electronic means.

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