Changes in Modern Communication Methods PDF

[CHANGES IN MODERN FORMS OF COMMUNICATION] Over time there have been many changes in the way people communicate. [THE POSTAL SYSTEM] The Chinese invented a basic form of postal service for the government in 900 BC. However, the idea of a postal service did not spread to other countries until many...

[CHANGES IN MODERN FORMS OF COMMUNICATION] Over time there have been many changes in the way people communicate. [THE POSTAL SYSTEM] The Chinese invented a basic form of postal service for the government in 900 BC. However, the idea of a postal service did not spread to other countries until many years later. Writing letters was a means of communication for many people for centuries. However, people did not have an effective and quick way in which letters could be delivered. Often they would have to wait until another person was travelling before their letter could be sent. There was no guarantee that the letter would be delivered. As countries developed, there was a need to communicate with people. In 1775, America created the first postal service. Letters could now be sent all over the country without the fear of them not reaching their destination. **[RADIO]** Radios are not only used for listening to music, the news or weather reports, but are used to help NASA speak to astronauts; to allow us to speak to people over the phone and for television broadcasting. Radios send information through electro-magnetic waves. These waves are measured in a metric measurement called a 'hertz'. This term is named after the early radio pioneer Heinrich Hertz. Electro-Magnetic Waves Radios are made up of two main parts; a transmitter and a receiver that sends signals back and forth. Inventors were inspired by the idea of the printing press invented by Johann Gutenberg. They wanted to invent something similar to the printing press, but on a smaller scale. The typewriter has been replaced now by the computer. **[Telegraph:]** The first commercial telegraph was developed by William Fotherill Cooke and Charles Wheatstone in 1837. It was a board with needles that pointed to the letters of the alphabet. **[Morse Code:]** In 1932, Samuel Morse strung seventeen hundred feet of wire around his room attached to a device. A key at one end was pressed to close the electric circuit. This then sent a pulse of electricity through the wire. When the key was released quickly, the pulse of electricity sent through the wire was a dot. If the key was held down 3 times longer, the pulse was a dash. The dots and dashes represent numbers and letters. These dots and dashes formed a system called 'Morse Code'. The person at one end of the wire would send a message to the person at the other end of the wire, using the dashes and codes. 1\. A dash is equal to three dots. 2\. The space between parts of the same letter is equal to one dot. 3\. The space between two letters is equal to three dots. 4\. The space between two words is equal to seven dots. **[The Telephone:]** The telephone was invented in 1876 by Alexander Graham Bell. He set up the telephonic device in his house. He made his assistant, Watson, go into another room with a telephone. Alexander Bell rang his assistant and the first words ever said over the telephone were: "Come here, Watson. I want you to see you." **[The Television:]** John Logie Baird is famous for being the first person to demonstrate the working television. His first television was made from bits and pieces in 1925. However, he improved on his design and on 26th January 1926, he showed his invention of the television to over 50 scientists. **[The Computer ]** During the 1940-1950s, a single computer filled an entire room. In the 1950s and 1960s computers became smaller and faster, but were still big and expensive. In the 1970s, smaller computers were designed so that they could be used in businesses, homes and schools. **[The Cell phone ]** Dr Martin Cooper invented the first portable handset in 1973.