With the passing of the years,
developments and inventions in
the electrical field succeeded each
other in increasing tempo. In
1876, Alexander Graham Bell
(1847–1922) developed the telephone.
The sound to be transmitted
via the telephone line was
picked up by a funnel-shaped
horn. The horn was terminated by
a thin metal diaphragm immediately
behind which was a small
coil wound on a bar magnet.
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