Descarga (25)

THE TELEPHONE

By Ariane08

  • THE TELEGRAPH

    THE TELEGRAPH
    For many centuries, people tried to send signals over long distance by using fires and mirrors to carry messages. In 1793, the telegraph was invented, and signals were first sent along wires. The telegraph was invented by Johann Reis, Antonio Meucci, Elisha Gray and Alexander Graham Bell.

  • Bell's first Telephones

    Bell's first Telephones
    Bell's First Telephone was invented in 1876.
    Bell's first telephone had one combined mouthpiece and earpiece. When you spoke into the horn, the voice was converted into electric signals which were carried along telephone wires.

  • Thomas Edison Telephone

    Thomas Edison Telephone
    Thomas Edison invent a telephone in 1879.
    Thomas Edison made a telephone with a separate mouthpiece and earpiece.

  • The mobil Phone

    The mobil Phone
    The mobil Phone was invented in 1979 at the Bell Telephone Laboratories in the USA. The first mobils coul certainly not fit in your pocket! A system of radio stations links the moving telephone to a computer network that keeps track of the caller.