* Pioneer era phone
"Graham Bell" with the idea to have invented the telephone, the hypothesis that one day. Bell noticed that sound is caused by vibration of piano wire. Therefore, it is probably the wire conductor.
With this principle, he has created a free pass to the sound wave as a flat sheet metal which is magnetic. Around and around the magnet coil wire again, and when the sound waves cause vibrations of metal. Vibration causes It flows through a wire, to another receiver, and the receiver has a similar function to change electricity back into the system one at a time. And here is the working hypothesis of the telephone receiver.
"Bell
The evolution of communication systems by using smoke pigeon, or that use the human journey, send a message. To this day, we cannot deny that the phone window is useful for your convenience, we have plenty of size
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