Sometime this year, the number of active mobile phones in the world will reach three billion out of a world population of six and a half billion people.The wireless industry has been built on a series of key steps of which the first took place in London, one year after the death of George IV.
1831 Michael Faraday’s discovery that the motion of a magnet could induce the flow of electric current in a conductor in the vicinity of the moving magnet.
1832 Baron Pavel Schilling’s application of Faraday’s discovery to setting up an electromagnetic telegraph system in St Petersburg
1833 Wilhelm Weber’s and Carl Friedrich Gauss’ application of Faraday’s discovery to use a moving magnet and a coil of wire to send a signal along a wire suspended from a church spire in Gottingen to the other side of the town.
1865 Clerk Maxwell’s equations predicting, inter alia, electromagnetic waves.
1874 Ferdinand Braun’s invention of the tuned electrical circuit, allowing reception of signals of only one frequency.
1893 Nikola Tesla’s demonstration of the feasibility of wireless communication
1895 Alexander Stepanovich Popov’s demonstration of a receiver for wireless signals
1896 Guglielmo Marconi’s first transmission and reception of a wireless signal.
1904 Sir John Ambrose Fleming’s invention of the vacuum diode.
1906 Lee De Forest’s invention of the triode vacuum tube
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