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The first digital computers were used primarily for scientific calculations. -
The telegraph was first used to transmit messages over relatively short distances, like in the same city. -
A membrane vibrated with the voice. When the membrane and the metal piece came into contact to vibrate, an electromagnet located next to it varied its magnetic field, inducing an electric current. -
Guillermo Marconi maked the first transmition by radio. The radio helped a lot in the first world war to communicate with the front lines -
It was an electronic device for the reception and reproduction of television signals.. -
Tablets or tablets use a touch-sensitive screen so you can quickly type and navigate -
The first mobile phone weighed more than 2 kilos and at first it was used for maritime communication.
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