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Telegraph by Samuel Morse
It used a conductor thread for each letter of the alfabet, a message could be transmited through the connection of the ends of the conductor thread into an electrostatic machine that send electromagnetic waves and made each telegraph work as a radio that sent messages using the morse code. -
Telephone by Antonio Meucci
The telephone was an artifact that allowed you to speak with someone from a distance.
It worked by making a membrane vibrate with the voice and this membrane touched a metallic piece. When the membrane and the metallic piece started touching, an elecromagnet that was right next to it variated its magnetic field, making an electrical current that made every telephone to work as a radio. -
Proprietary telephone by Alexander Graham Bell
Alexander Graham Bell (AKA the inventor of the telephone wasnn't really the telephone inventor however he was the first to patentate it so he is known worldwide for being the telephone inventor. He had many legal problems to patentate it because there were a lot of people like Elisha Gray and Antonio Meucci that were really mad because they said thet he had stole is invention however he managed to patentate the telephone. -
Radio by Guillermo Marconi
It was a ``portable´´ device that wheighed about 10 kg, it was made out of lead sulfyde crystal also known as galena. It was imposible to change the dial even though there weren't much stations to listen at.
The radio was equipped with a transmissor, and it receives its signal from just that transmissor. The radio worked by receiving data using that transmissor and it transformed that data into sounds. -
Television by John Logie Baird
The first television was build mostly with trash, the base was a tea box, the lamp was inside a coockie can, the discs were made out of cardboard and he used the cheapest glasses he could find.
Jhon trusted a lot in transmiting images trough electromagnetic waves like a radio.
It was used to inform people of the news and stuff, it was like a radio but with images. -
Computer by Konrad Zuse
The first computer was built with 800 relays even though it still had mechanical components. The control mechanism was based on a system of perforated tape and with the aritmetical unit using electromechanical relays. -
Tablet by Alan Kay
The first tablet also known as dynabook was ``a personal computer for all ages´´ Its original idea was to get a kind of computer with a flat shape that was going to be orientated to the education. It had a reduced thikness, a tactile screen made out of melted glass and a keyboard. -
Mobile telephone by Martin Cooper
The first mobile telephona was the Motorola DynaTAC 8000X, a tremendous hulk. It was just like a brick. It weighed 800 g and it had a measure of 33 cm high, 4,5 cm wide and 8,9 cm thick and it had a huge antenna.
As the user phisically moved, the central transported the signal from antenna to antenna so that the call had continuity. The mobile thelephona used a battery that lasted 8 hours and it needed to be charged for 10 hours.