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Originally Posted by pmulcahy11b
Things like that might actually make a comeback as radios and field telephones break down, batteries become drained, lightbulbs burn out for light signals, etc.
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At the end of the 18th century, France had a system that was called the "Télégraphe de Chappe". That was abandonned in the late 1840's when it was replaced by electrical telegraphs. However, several tower are still in existence and such a system could be used again. It was capable of bringing a message from Paris to Toulon (roughly 900 km) in about 90 minutes.
Here is a website on it and a picture of a surviving one
http://visite.artsetmetiers.free.fr/.../chappe_a.html