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Modern aviation has made skywriting possible. In one recorded instance, a smoke signal reply translated as "we are coming" was misinterpreted as joining a war party for protection of the tribe when it was actually hunting parties coming together after a successful hunt. Like other means of communication, signals could be misinterpreted. This message could include the names of individual tribesmen. To carry information, the colour of the smoke was varied, sometimes black, white or blue depending on whether the material being burnt was wet grass, dry grass, reeds or other, and the shape of the smoke could be a column, ball or smoke ring. "Putting up a smoke" would often result in nearby individuals or groups replying with their own signals. This signal could be from a fixed lookout on a ridge or from a mobile band of tribesman. Smoke signals were sometimes to notify of incursions by hostile tribes, or to arrange meetings between hunting parties of the same tribe. Sometimes used to describe visiting whites, smoke signals were the fastest way to send messages. Sometimes to notify others of their presence, particularly when entering lands which were not their own. The Cape Town Noon Gun, specifically the smoke its firing generates, was used to set marine chronometers in Table Bay.Īboriginal Australians throughout Australia would send up smoke signals for various purposes. They might also have used smoke signals on other occasions, thus it is possible that Magellan saw such fires (which inspired him to name the landscape Tierra del Fuego) but he may have seen the smoke or lights of natural phenomena.
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The large amount of meat required notification of many people, so that it would not decay. Yámanas of South America used fire to send messages by smoke signals, for instance if a whale drifted ashore. Lewis and Clark's journals cite several occasions when they adopted the Native American method of setting the plains on fire to communicate the presence of their party or their desire to meet with local tribes. Smoke signals may also refer to smoke-producing devices used to send distress signals. Black smoke indicates a failed ballot, while white smoke means a new Pope has been elected.Ĭolored smoke grenades are commonly used by military forces to mark positions, especially during calls for artillery or air support.
SMOKE SIGNALS PLUS
Eligible cardinals conduct a secret ballot until someone receives a vote of two-thirds plus one. The College of Cardinals uses smoke signals to indicate the selection of a new Pope during a papal conclave. If it came from halfway up the hill, this would signify all was well, but from the top of the hill it would signify danger. Reputedly the location of the smoke along the incline conveyed a meaning. The grass would be taken off as it dried and another bundle would be placed on the fire. A signaler started a fire on an elevation typically using damp grass, which would cause a column of smoke to rise. Each tribe had its own signaling system and understanding.
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North American indigenous peoples also communicated via smoke signal. This cryptographic concept has been used with Japanese Hiragana and the Germans in the later years of the First World War. This idea, known as the " Polybius square", also lends itself to cryptography and steganography. It enabled messages to be easily signaled by holding sets of torches in pairs. Polybius, a Greek historian, devised a more complex system of alphabetical smoke signals around 150 BCE, which converted Greek alphabetic characters into numeric characters. King You of Zhou had a habit of fooling his warlords with false warning beacons in order to amuse Bao Si, his concubine. Misuse of the smoke signal is known to have contributed to the fall of the Western Zhou Dynasty in the 8th century BCE. In this way, they were able to transmit a message to the King in just a few hours. In ancient Sri Lanka, soldiers stationed on the mountain peaks would alert each other of impending enemy attack (from English people, Dutch people or Portuguese people) by signaling from peak to peak. Smoke signals also warned the inner castles of the invasion, allowing them to coordinate a defense and garrison supporting troops.
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By placing the beacon towers at regular intervals, and situating a soldier in each tower, messages could be transmitted over the entire 7,300 kilometres of the Wall. The colour of the smoke communicated the size of the invading party. In ancient China, soldiers along the Great Wall sent smoke signals on its beacon towers to warn one another of enemy invasion.