Semaphore

IDevice Icon Objectives

Read through the information and answer the following questions.

 
1. What are the people in the pictures holding in their hands?
2. What battle is mentioned as being an example of a time when people used semaphore signals?
3. What 2 semaphore letters are used to make up the peace symbol? (Clue look down in the Popular culture section)


Flag semaphore

From Wikipedia, the free encyclopedia

Flag semaphore is a system for 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. Semaphores were adopted and widely used (with hand-held flags replacing the mechanical arms of shutter semaphores) in the maritime world in the early 1800s. Semaphore signals were used, for example, at the Battle of Trafalgar. This was the period in which the modern naval semaphore system was invented. This system uses hand-held flags. It is still used during underway replenishment at sea and is acceptable for emergency communication in daylight or, using lighted wands instead of flags, at night.

Wig-wag flags

Wig-wag signalling (or wigwagging) uses two flags for signalling, in a method similar to semaphore, but by opening and closing the sign, the morse code equivalent of dots and dashs are used to convey the message. It was used in US Civil War times. A signal corpsman commonly stood on a platform about 6-10 feet off the ground, signalling to other units. The bright orange red and white flag made a primary target for the enemy.

Modern semaphore

The newer flag semaphore system uses two short poles with square flags, which a signalman holds in different positions to signal letters of the alphabet and numbers. The signalman holds one pole in each hand, and extends each arm in one of eight possible directions. Except for in the rest position, the flags cannot overlap. The flags are coloured differently based on whether the signals are sent by sea or by land. At sea, the flags are coloured red and yellow (the Oscar flag), while on land, they are white and blue (the Papa flag).

Characters

The following semaphore characters are presented as one would face the signalman:

In popular culture

  • In the short story for kids, "The Mystery of the Seven Wrong Clocks" (published in Alfred Hitchcock's Solve-Them-Yourself Mysteries, edited by Robert Arthur, Jr., Random House 1963), a soon-to-be murder victim identifies his murderer using the hands of clocks set in semaphore positions.
  • In the book Winter Holiday by Arthur Ransome, Nancy sends secret messages to the other children by means of a picture in which the people's arm positions represent semaphore letters. In Missee Lee, Captain Flint sends a message to the Swallows and Amazons using the same technique.
  • In a strip, the webcomic Sam and Fuzzy portrays one of the two titular characters, Fuzzy, using flag-based semaphore to convey a message he has been expressly (and legally) forbidden to repeat.
  • The Beatles' album cover Help! (1965), according to photographer Robert Freeman, was originally going to show the Beatles signaling the word HELP in semaphore. However, if read according to the code, George signals an "N" or maybe an "R" or "S", John a "U", Paul a "J", and Ringo a "D", "V", or "Cancel". The images on the US album are out of order, and all of the pictures are mirror-reversed. In the UK order, and reversed, the message appears to spell "LPUS." Freeman has stated that the letters "H-E-L-P" did not look good, graphically. Apparently "LPUS" ("help us") was used as a better-looking substitute (see Freeman, The Beatles: a Private View, p.62).
  • The peace symbol is a combination of the semaphoric letters N and D, standing for "nuclear disarmament". [1]
  • In the movie The Last Detail starring Jack Nicholson and Randy Quaid, Nicholson plays a signalman in the US Navy who teaches semaphore to Quaid while escorting him to military prison. Quaid signals: "Bravo Yankee, Bravo Yankee, end of message" before attempting an escape.
  • In Arthur, the Brain has a dream where his strict teacher makes the class take a test in semaphore.
  • In The Simpsons, Admiral Nelson sends a message to Captain Skinner which reads "Bligh eats dolphin boogers."
  • In episode 37 of the anime series You're Under Arrest, a message is sent in Japanese that reads "ganbatte" ("good luck" in English).

 


This article is licensed under the GNU Free Documentation License. It uses material from the article "Flag_semaphore".