Communication prsentation by virginia


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Communication prsentation by virginia

  1. 1. Sending Messages in the Early days<br />By Virginia, Plaeton, Betty & Jordan<br />
  2. 2. How did people send Messages In the past?<br />Well did you know that the only bird that has ever been trained to send messages were Pigeons?<br />Pigeons were used by Air Crews to send messages back to base. They were also used by the army to also send messages back to base there was once a special unit that dealt with the training of Pigeons for this purpose. There was even a Pigeon awarded a Medal for bravery in carrying messages. He was able to save 194 soldiers but could not save himself. They would write their message on a soft piece of tissue paper called flimsies then they would attach it to the bird’s leg then release it until they came back. When the pigeon came back it entered a trap door sending a bell down to the office. Someone would climb up, get the message and set it to the main part of the loft and there they would get their treat and reward.<br />
  3. 3. The history of sending messages<br />The first way people sent messages were in bottles. They took a glass bottle that was middle sized and wrote their messages on a piece of paper. Then they would put it inside the bottle and release it into the sea or river. The first recorded messages in bottles were released around 310 BC by the Ancient Greek philosopher Theophrastus as part of an experiment to show that the Mediterranean Sea was formed by the inner Atlantic Ocean. In the 16th century, the English navy, among others, used bottle messages to send ashore information about enemy positions. Queen Elizabeth I even created an official position of "Uncorked of Ocean Bottles", and anyone else opening the bottles could face the death penalty.<br />
  4. 4. Semaphore Flags<br />Semaphore flags are the system for transmitting information at a distance by means of visual signals with hand held flags, rods, disks, paddles, or occasionally bare or gloved hands. Information is shown 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 for signaling, in a method similar to semaphore, but by opening and closing the sign, the Morse code which is represented by dots and dashes are used to express 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, signaling to other units. The bright orange red and white flag made a primary target for the enemy.<br />
  5. 5. The smoke signals<br />It is a form of visual communication used over long distance. In Ancient China, soldiers along the Great Wall would alert each other of any enemy attack by signaling from tower to tower. In this way, they were able to transmit a message as far away as 750 kilometers in just a few hours. Polybius, a Greek historian, came up with a more complex system of alphabetical smoke signals around 150 BC. He invented a system of converting Greek alphabetic characters into number characters. It was devised to enable 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. Smoke signals are still in use today. In Rome, the College of Cardinals uses smoke signals to indicate the selection of a new Pope. Suitable 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; white smoke means a new Pope has been elected. In general smoke signals are used to transmit news, signal danger, or gather people to a common area.<br />
  6. 6. bibliography<br />We found our information from <br />Wikipedia <br />Kids info<br />And Google<br />
  7. 7. Thank you for watching our presentation. We hope you have enjoyed our Power Point Presentation<br />Check out our picture gallery in the next slide!<br />