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The telephone

By 08leizuri

  • Telegraph

    Telegraph
    Signals were first send along wires.

  • First telephones

    First telephones
    Johann Reis, Antonio Meucci, Elisha Gray and Alexander Graham Bell were all trying out the first telephones, but, Bell's was grated the first patent.

  • Thomas Edisons telephone

    Thomas Edisons telephone
    Thomas Edison made a telephone with a separate mouthpiece and earpiece.

  • Telephone calls operator

    Telephone calls operator
    All telephone calls had to go throught an operator. The operator answered your call, took the number you wanted and plugged in your line to complete the electrical circuit and connect your call.

  • "Cradle" telephones

    "Cradle" telephones
    The first dial phones were used and by at the 1920s , Cradle telephones were popular in Europe and the USA.

  • Mobile Phone

    Mobile Phone
    Was invented at the Bell telephone Laboratories in the USA. A system of radio stations links the moving telephone to a computer network that keeps track of yhe caller.