Matrix Games Forums

A short video on heliographs, which were Victorian Era solar communication devices. This guy's channel is excellent and covers a wide range of older technologies, many of them military.

https://www.youtube.com/watch?v=zhFevbuwS88

My father maintained that he was the last person alive who knew how to assemble and use a British Army heliograph - still being used in India in WW2.
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