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Flag semaphore (from the Ancient Greek σῆμα (sêma) 'sign' and - φέρω (-phero) '-bearer' [1]) is a semaphore system conveying information at a distance by means of visual signals with hand-held flags, rods, disks, paddles, or occasionally bare or gloved hands. Information is encoded by the position of the flags; it is read when the flag is in a fixed position.
The Semaphore flag signaling system is an alphabet signalling system based on the waving of a pair of hand-held flags in a particular pattern. The flags are usually square, red and yellow, divided diagonaly with the red portion in the upper hoist. The flags are held, arms extended, in various positions representing each of the letters of the ...
The International Code of Signals (INTERCO) is an international system of signals and codes for use by vessels to communicate important messages regarding safety of navigation and related matters. Signals can be sent by flaghoist, signal lamp ("blinker"), flag semaphore, radiotelegraphy, and radiotelephony. The International Code is the most ...
signal. Semaphore atop a tower. semaphore, method of visual signaling, usually by means of flags or lights. Before the invention of the telegraph, semaphore signaling from high towers was used to transmit messages between distant points. One such system was developed by Claude Chappe in France in 1794, employing a set of arms that pivoted on a ...
- The Editors of Encyclopaedia Britannica
Flag signals. Flag signals can mean any of various methods of using flags or pennants to send signals. Flags may have individual significance as signals, or two or more flags may be manipulated so that their relative positions convey symbols. Flag signals allowed communication at a distance before the invention of radio and are still used ...
In 1738, a French officer named Mahé de la Bourdonnais devised the first numerical flag code, the basis on which all later development of flaghoist signaling was based. Bourdonnais assigned a different flag to each number, 0 through 9. With three sets of flags, a ship could make 1,000 different combinations of three-flag signals.
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SEMAPHORE FLAG SIGNALING SYSTEMThe system for conveying information at a distance by means of visual signals with hand-held flags, or oc. sionally bare or gloved hands. Information is encoded by the position of the flags; it is read when. e flag is in a fixed position. Semaphores were adopted and widely used in the mar. time world in the 19th ...
