Smoke Signals (1 janv. 1800 av. J.-C. – 1 janv. 500 av. J.-C.)
Description:
For a long time, Smoke Signals were used as the main form of communication. This is because it could be used over a long distance. In 150BC, the Greeks created a system of alphabetic characters and converted it into numeric characters. This way they could convert it using pairs of torches into smoke signals.
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Communication systems
Geography homework
Date:
