Smoke signal

A smoke signal is a form of visual communication used over a long distance, developed both in the Americas and in China. By covering an open fire with a blanket and quickly removing it, a puff of smoke can be generated. With some training, the sizes, shapes, and timing of these puffs can be controlled. Puffs may be observed from long distance, apparent to anyone within its visual range. With this in mind, signalling stations were often created to maximise the viewable distance. Stone bowls used by Native Americans and the towers of the Great Wall of China are examples of signalling stations.

Related Topics:
Visual communication - The Americas - China - Fire - Blanket - Puff - Smoke - Native Americans - Great Wall of China

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There is no standardized code for smoke signals, they signals are often of a predetermined pattern discerned by sender and receiver. Because of this, smoke signals tend to only convey simple messages, and are a limited form of communication.

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