Alexander Graham Bell

Alexander Graham Bell

Categorie: Fizica
Data adăugării: 15.09.2011
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Alexander graham bellscottish inventor
1847 -1922

alexander graham bell was born on march 3, 1847 in edinburgh, scotland. bell is best known for his invention of the telephone. many inventors had been working on the idea of sending human speech by wire, but bell was the first to succeed.
the invention of the telephone grew out of improvements bell had made to the telegraph. he had developed the harmonic telegraph which could send more than one message at a time over a single telegraph wire. bell reasoned that it would be possible to pick up all the sounds of the human voice using an adaptation of the harmonic telegraph. in 1875, along with his assistant thomas a. watson, bell constructed instruments that transmitted recognizable voice-like sounds.
bells first telephone patent was granted on march 7, 1876. three days later he and watson, located in different rooms, were about to test the new type of transmitter described in his patent. watson heard bells...

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