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About 100 years ago Alexander Graham Bell invented the telephone by accident with his assistant Mr Watson Over many years the modern version of the telephone makes the one that Bell invented look like a piece of junk Developments in tone dialing call tracing music on hold and electronic ringers have greatly changed the telephone This marvelous invention allows us to communicate with the entire globe 24 hours a day just by punching in a simple telephone number It is the most used piece of electronic apparatus in the world It is probably one of the most easy to use electronics available too All you have to do is pick up the receiver listen for the tone and then select a number using either tone or pulsing dial A telephone can be separated into two main categories there is the tone touch tone or the older rotary dial pulse telephones Then you can divide those into other categories such as business line multi -- line or home line single line You can also have many other types of phones there are those that hang on the wall on the desk etc THE HANDSET No matter what kind of telephone you own there has to be some device that allows you to talk to and listen to This device is called the handset The handset is usually made out of plastic and inside it are two main components the transmitter and the receiver THE TRANSMITTER It is the job of the transmitter to turn the air pressure created by your sound waves to electrical signals so they can be sent to the other telephone The waves hit a thin skin called the diaphragm that is physically connected to a reservoir of carbon granules When the pressure hits the diaphragm it shakes up the carbon granules Then the carbon
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