WebMay 1, 2024 · Smoke signals were used by the Chinese in ancient times to give warnings about an approaching enemy. Guards stationed on the towers along the Great Wall … WebJan 7, 2016 · Fire and smoke have been used to communicate trouble or distress among people ever since. The invention of the telescope in the 1700s significantly increased the range of long distance silent …
Light, Fire, and Smoke Emergency Communication Signals
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The History of Messaging SimpleTexting.com
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