Attention Deficit Disorder Prosthetic Memory Program

Smoke Signal

ADDPMP619
Smoke Signal - © Attention Deficit Disorder Prosthetic Memory Program

In ancient China, soldiers along the Great Wall sent smoke signals on its beacon towers to warn one another of enemy invasion. The colour of the smoke communicated the size of the invading party. 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. Smoke signals also warned the inner castles of the invasion, allowing them to co-ordinate a defence and garrison supporting troops.

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. In this way, they were able to transmit a message to the King in just a few hours.

Misuse of the smoke signal is known to have contributed to the fall of the Western Zhou Dynasty in the 8th century BCE. King You of Zhou had a habit of fooling his warlords with false warning beacons in order to amuse Bao Si, his concubine.

Polybius, a Greek historian, devised a more complex system of alphabetical smoke signals around 150 BCE, which converted Greek alphabetic characters into numeric characters. It enabled messages to be easily signaled by holding sets of torches in pairs. This idea, known as the “Polybius square”, also lends itself to cryptography and steganography. This cryptographic concept has been used with Japanese Hiragana and the Germans in the later years of the First World War.

North American indigenous peoples also communicated via smoke signal. Each tribe had its own signaling system and understanding. A signaler started a fire on an elevation typically using damp grass, which would cause a column of smoke to rise. The grass would be taken off as it dried and another bundle would be placed on the fire. Reputedly the location of the smoke along the incline conveyed a meaning. 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.

Smoke signals remain in use today. The College of Cardinals uses smoke signals to indicate the selection of a new Pope during a papal conclave. Eligible cardinals conduct a secret ballot until someone receives a vote of two-thirds plus one. The ballots are burned after each vote. Black smoke indicates a failed ballot, while white smoke means a new Pope has been elected.

Colored smoke grenades are commonly used by military forces to mark positions, especially during calls for artillery or air support.

Smoke signals may also refer to smoke-producing devices used to send distress signals.

Derby of the Eternal Enemies - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP187
Derby of the Eternal Enemies
Me At The Zoo - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP159
Me At The Zoo
Rogue Waves - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP060
Rogue Waves
Electroencephalophone - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP374
Electroencephalophone
Peanut Hole - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP521
Peanut Hole
Dhampir - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP218
Dhampir
Parental Advisory - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP416
Parental Advisory
Savonius Wind Turbine - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP382
Savonius Wind Turbine
Memristor - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP599
Memristor
Photo Calibration Targets - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP262
Photo Calibration Targets
Interchanges - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP283
Interchanges
Facial Recognition System - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP340
Facial Recognition System

You are using an outdated browser.
Please upgrade your browser to improve your experience.