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The pigeon would be labeled for a certain location and once released with the message, would then return home.
The wearer will respond to a signal by looking at a small screen on the device for an important message, which is usually in numeric code.
Usually the placement of the signal on a hill would indicate different meanings.
Today, smoke signals are still used in Rome to signify when a new Pope has been selected.
Using a series of relay stations, the Pony Express reduced time for messages to travel from coast to coast to just 10 days.
It was a vital system for sending notes east to west prior to the birth of the telegraph.