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Alexander Graham Bell was born in Scotland in 1847.
His father was a teacher who
___1___ deaf-mutes to speak. Alexander was trained
___2___
the
sciences. This ___3___ him to investigate the
possibility of transmitting the
human ___4___ through wire. Alexander was suffering from tuberculosis
___5___ which
his two
brothers had died. The weather in Scotland was not
___6___ to his health, so
his father ___7___ to move to Canada in 1870.
In 1873, Alexander ___8___ a professor in Boston
University.
___9___ with Thomas Watson, Alexander experimented
___10___
electrical transmissions ___11___ telegraph messages.
A German, J.P. Reis, invented a telephone that
___12___
transmitted
music and noise, but ___13___ the human voice in 1861.
Alexander was
convinced ___14___ he could make the transmission of
human voices
___15___. He spent many long
___16___ experimenting with
the
diaphragm and magnetic coil ___17___ the telephone.
Finally, in 1876, he ___18___, and the new telephone
was born. The
money he made ___19___ his invention was spent
___20___ the
deaf. He married a deaf student, Mabel Hubbard, a
year later. |
