The Telephone

The invention which transformed the world of communication, the telephone was invented by Alexander Graham Bell.

When we pick up the handset or reciever to speak to someone, a catch in the unit or the handset is released and an electric current is sent to the exchange. The dial tone we hear is the confirmation that the exchange is ready to recieve our call. Dialing the number turns on or off the current depending upon the number dialled. Once the person has picked up the phone at his end we speak into the mouthpiece.

This mouthpiece contains a small reciever.In the reciever there are carbon granules. As we speajk the vibrations in our voice cause the carbon granules to compress or decompress depending upon the modulations of our voice.

When our voice is recieved at the other end, the recieving apparatus located in the earpiece reverss the process and a sound is herad.