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Computer, Charles Babbage
They were usually built by hand using circuits containing relays and vacuum tubes, and often used punch cards. -
Telegrah, Joseph Henry
if there was no flow of electricity, the pencil drew a straight line. When there was that flow, the pendulum swung and a zigzag was drawn on the line. -
Telephone, Alexander Graham Bell
The operation of his creature was simple: a membrane vibrated with the voice, touching a piece of iron. 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 -
Radio, Guillermo Marconi
It was a "portable" device weighing about ten kilograms, made from the lead sulfide crystal known as galena. It was impossible to change the dial, although the stations continued to be very scarce. -
Television, John Logie Baird
The first televisions that can be considered commercial were of the mechanical type and were based on a rotating disk, the Nipkow disk. -
Tablet, Alan Kay
The Linus Write-Top, a very limited piece of equipment that allowed writing directly on its screen using a stylus. -
Mobile phone, Martin Cooper
In those days an antenna covered 15 blocks around. As the user moved physically, the central transported the signal from antenna to antenna, so that the call would have continuity.