Semaphore towers might be a key feature of the cantonments we were discussing earlier.
IIRC, the Royal Navy operated a long-distance "telegraph" (not Morse's electrical one) before/during the Napoleonic Wars between the Admiralty in London and the main naval base of Portsmouth. I think it involved lanterns for night messages, too.
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My Twilight claim to fame: I ran "Allegheny Uprising" at Allegheny College, spring of 1988.
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