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The Invention of the Telephone and How It Has Changed Over the Years About 100 Decades ago, Alexander Graham Bell invented the telephone by injury together with his assistant Mr. Watson. Over many decades, the contemporary variant of the phone makes the one which Bell invented seem like a bit of junk. Developments in tone dialing, call tracing, music on hold, and electronic ringers have greatly altered the telephone. This marvelous invention allows us to communicate with the entire globe 24 hours a day just by punching in an easy telephone number. It is the most used piece of electronic devices in the entire world. It's most likely one of the most simple to use electronics accessible also. All you have to do is pick up the receiver, listen for the tone, and then select a number utilizing either tone or pulsing dial. A telephone can be split into two main categories: there's the tone (touch tone) or the older rotary dial (heartbeat) phones. Then it is possible to divide those into other classes like business line (multi - line) or house line (single line). You can also have many different kinds of phones: there are the ones that hang on the wall, on the desk, etc.. THE HANDSET No matter what kind of telephone you own, there needs to be some system that lets you talk to and listen to. This device is known as 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's the job of the transmitter to turn the air pressure created by your sound waves to electrical signals so they may 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. After the pressure hits the diaphragm, it shakes up the carbon granules. Then the carbon expands and contracts, depending on what force is exerted. At two points on the outer shell of the reservoir of the carbon are two outlets of electricity from the talk battery. By applying voltage, a current is made and is passed along the lines to the waiting telephone. At the other end the current is transformed back to speech. THE RECEIVER The receiver turns an ever varying current back to speech. A permanently magnetized soft iron core is covered in many turns of very fine wire. Through the wire, the electrical c.. .