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Alexander Graham Bell (1847-1922), Scottish-US inventor and telephone pioneer. By 1871, Bell had moved to the USA, becoming professor of Vocal Physiology at Boston. He experimented on converting sound waves into electrical impulses for transmission down wires (telephony). While not the true inventor of the telephone, Bell's work and patents helped make the telephone a practical working device. In 1876, he founded what became the AT&T Company. This photograph is from the Bain News Service in the USA. The bulk of the Bain images date from the period from the 1890s to the 1930s. (KEYSTONE/SCIENCE PHOTO LIBRARY/LIBRARY OF CONGRESS/SCIENCE PHOTO LIBRARY)