Photo Researchers ftp March 2011
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Portrait of 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 vodal physiology a 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."
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Photo Researchers ftp March 2011
2011-03-24
EAST NEWS
Science Source
New York Public Library Picture
BP9697
0,97MB
24cm x 34cm by 300dpi
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