Bits of "Graham Bell" about the idea of inventing a machine theory is that this phone one day. Bell noted that the piano sound is caused by vibration of wire. Therefore, so is probably the wire conductor. The sound from one address to another. With this principle, he created the idea passed to a sound wave to the sheet metal flat, which contain magnets. Close the coil wire and the round magnet and when sound waves cause vibrations of metal. Vibration cause Electricity up in wire around a magnet, and then flow through the wire, another route which continues into the receiver, and the receiver, it will have a similar act change the electricity back to the sound. And this is all theory is the work of a telephone receiver by "Graham Bell".
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