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ALEXANDER GRAHAM BELL, SCOTTISH-AMERICAN INVENTOR

Alexander Graham Bell (1847-1922), Scottish-American speech therapist and inventor of the telephone. Bell followed his father and grandfather into the speech therapy profession, but also studied sound waves and the mechanics of speech. By 1871, he had moved to the USA, becoming professor of Vocal Physiology at Boston. There he performed his experiments in converting sound waves into electrical impulses for transmission down wires. In 1876, he patented the 'telephone', and founded what has become the AT&T Company. In later years he made many improvements to the telephone, worked with Langley and Curtis on flying machines, and founded the journal Science. (KEYSTONE/SCIENCE PHOTO LIBRARY/SMITHSONIAN INSTITUTION/COPYRIGHT STATUS UNKNOWN/SCIENCE PHOTO LIBRARY)

ALEXANDER GRAHAM BELL, SCOTTISH-AMERICAN INVENTOR

Alexander Graham Bell (1847-1922), Scottish-American speech therapist and inventor of the telephone. Bell followed his father and grandfather into the speech therapy profession, but also studied sound waves and the mechanics of speech. By 1871, he had moved to the USA, becoming professor of Vocal Physiology at Boston. There he performed his experiments in converting sound waves into electrical impulses for transmission down wires. In 1876, he patented the 'telephone', and founded what has become the AT&T Company. In later years he made many improvements to the telephone, worked with Langley and Curtis on flying machines, and founded the journal Science. Photographed in 1876. (KEYSTONE/SCIENCE PHOTO LIBRARY/SMITHSONIAN INSTITUTION/COPYRIGHT STATUS UNKNOWN/SCIENCE PHOTO LIBRARY)

ALEXANDER GRAHAM BELL, SCOTTISH-AMERICAN INVENTOR

Alexander Graham Bell (1847-1922), Scottish-American speech therapist and inventor of the telephone. Bell followed his father and grandfather into the speech therapy profession, but also studied sound waves and the mechanics of speech. By 1871, he had moved to the USA, becoming professor of Vocal Physiology at Boston. There he performed his experiments in converting sound waves into electrical impulses for transmission down wires. In 1876, he patented the 'telephone', and founded what has become the AT&T Company. In later years he made many improvements to the telephone, worked with Langley and Curtis on flying machines, and founded the journal Science. Photographed c. 1880s..... (KEYSTONE/SCIENCE PHOTO LIBRARY/SMITHSONIAN INSTITUTION/COPYRIGHT STATUS UNKNOWN/SCIENCE PHOTO LIBRARY)

ALEXANDER GRAHAM BELL, SCOTTISH-AMERICAN INVENTOR

Alexander Graham Bell (1847-1922). 1867 illustration of the Scottish-US inventor Alexander Graham Bell. Bell is best known for his pioneering work in the development of the telephone. He followed his father and grandfather into the speech therapy profession, but also studied sound waves and the mechanics of speech. By 1871, he had moved to the USA, becoming professor of Vocal Physiology at Boston. He performed experiments in converting sound waves into electrical impulses for transmission down wires (telephony). While not the true inventor of the telephone, Bell's work helped develop and make telephones into practical working devices. He patented his telephone (1876) and founded the Bell Telephone Company. (KEYSTONE/SCIENCE PHOTO LIBRARY/COLLECTION ABECASIS/SCIENCE PHOTO LIBRARY)