Technology

The smoke signal

Technology

The smoke signal

The smoke signal is one of the oldest forms of long-distance communication. It is a form of visual communication used over a long distance. In general smoke signals are used to transmit news, signal danger, or gather people to a common area. In ancient China and Sri Lanka soldiers stationed along the Great Wall and on the mountain peaks would alert each other of impending enemy attack by signaling from tower to tower and peak to peak.

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