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Innocenzo Manzetti Created the first speaking telegraph. It was a single port design in which required the speaker to alternately speak into and then listen through the same hole.
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In 1854, Charles Bourseul writes a manuscript about the principles of the telephone.
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In 1861 the inventor Philipp Reis invents the first speech transmitting phone.
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In April of 1875 Bell uses multipul vibrating steal reads in make break circuits to improve the telephone.
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Thomas Edison experiments with acuoustic telegraphy. In November of 1875 he builds an electro dynamic reciever.
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The first sentence transmitted by bell is as follows:
" Mr. Watson come here! I want to see you!" -
In 1877 Alexander Graham Bell made it possible for people to reach each other long distance.
