Wig Wag Signals and Wigwagging

Wig Wag Signals and Wigwagging - excerpt from the book "The Scientific American Boy" by A. Russell Bond Our tramp adventure was really quite a blessing to us, for it…

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Heliograph – Communicating by light

What is Heliograph?How to Make a HeliographSometimes when you are in open country, you may catch a flash of sunlight on the windshield of a car many miles away.The windshield…

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Semaphore Alphabet

Throughout history, armies and navies have sent messages across battlefields.Simple orders like “Advance” or “Retreat” could be given by bugle calls or cannon-fire.But sending reports of the battle back to…

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