This vibration will change the magnetism of a magnet mounted nearby. Thus there was a change of electric current on the wire clump around the magnet. The current is streamed through the wire. This causes the diaphragm to vibrate. In 1876, precisely on March 10, Bell spoke on the world's first telephone line. He chatted with his maid in another room. Mr. Watson, he said. Please come here, I need to be Tuan. But Watson found Bell's voice not quite clear. The real and the real thing is that Bell sounds the way through the wire then a phone is born.
In 1889 another inventor named Almon B. Stroger invented the rotating disc system. She thought maybe the girl who worked in the telephone office sent her messages to another inventor. Therefore, he wanted an automated phone that no longer needed the operator. The major cities of the world have used automated telephones. In Indonesia dumulai eaters in Bandung, Jakarta. Then in Solo and other cities. Only for such complicated tools requires experienced engineers. An experienced engineer may take weeks to learn about every new change.
Source: Kitab Emas "Penemuan-penemuan Dulu sampai Sekarang"
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