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Semaphore (lit. ' apparatus for signalling '; from Ancient Greek σῆμα (sêma) 'mark, sign, token' and Greek -φόρος (-phóros) 'bearer, carrier') [1] is the use of an apparatus to create a visual signal transmitted over distance. [2] [3] A semaphore can be performed with devices including: fire, lights, flags, sunlight, and moving arms.
A US Navy crewman signals the letter 'U' using flag semaphore during an underway replenishment exercise (2005). 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.
With a sinister hoist, the semaphore flag. P Papa [ˈpa.pə] The Blue Peter. In harbour: All persons should report on board as the vessel is about to proceed to sea. At sea: It may be used by fishing vessels to mean: "My nets have come fast upon an obstruction." Q Quebec [kəˈbɛk] "My vessel is 'healthy' and I request free pratique." R Romeo ...
Naval flag signalling undoubtedly developed in antiquity in order to coordinate naval action of multiple vessels. In the Peloponnesian War (431 – 401 BCE) squadrons of Athenian galleys were described by Thucydides as engaging in coordinated maneuvers which would have required some kind of communication; [1] there is no record of how such communication was done but flags would have been the ...
The NATO usage generally differs from the international meanings, and therefore warships will fly the Code/answer flag above the signal to indicate it should be read using the international meaning. During the Allied occupations of Axis countries after World War II, use and display of those nations' national flags was banned.
The "standard" 90 degree 3 position Lower Quadrant spectacle saw limited application (the last were used in Memphis, Tenn. and St. Louis, Mo,. Terminals) as the Lorre-Patenall U.Q. spectacle provided significantly greater visual range. The blade portion of the semaphore was of several designs, each conveying a different meaning:
Sighting problems may mean that the post is placed on the right of the other line on double track branches and on single lines, could be placed either side of the track. North American semaphore equivalents faced right, and as generally on the European continent, on double track branches, up and down lines are opposite to those in the UK.
Flag semaphore signalling uses two flags, held in specific positions to signify letters. This method requires simple equipment but can be obscured by bad weather. This method requires simple equipment but can be obscured by bad weather.