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After the telegraph and before the radio, the heliograph provided long-distance wireless communication. In November 1877 Jowaki tribesmen along what is now Pakistan’s western frontier were puzzled by the brilliant staccato flashes radiating from the hilltops ringing the Bora Valley. No act of nature, the flashes were signals being passed between two columns of the …
The post Light Conversation: The Heliograph appeared first on HistoryNet.
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