Alexander Graham Bell (1847-1922) was born in Scotland but moved to the USA. He realized that sound consists of vibrations, and he began working out a way of changing these vibrations into electrical impulses. These impulses could then be carried along a wire – this was the origin of the telephone. His rival, Thomas Edison, soon produced a much improved version of Bell’s telephone. Bell retaliated by devising a better version of Edison’s own phonograph.
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