In 1835, Samuel F. B. Morse proved that signals could be transmitted by wire. He used pulses of current to deflect an electromagnet. This moved a marker which wrote codes on paper. This became known as the Morse Code, named after Samuel. In 1836, he changed the written codes to dots and dashes. A few years later, it started to be used for trains on railroads so that two trains would not be sent out at the same time heading towards each other. The telegraph changed the world because it was the first way to send messages without having to be directly in front of the receiver.
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