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What was Guglielmo Marconiās magnetic detector used for?
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Guglielmo Marconi
Italian physicist Guglielmo Marconi, shown here about 1908, invented a successful wireless telegraph (that is, a radio) in 1896.
Guglielmo Marconi patented the magnetic detector in 1902 to improve the efficiency of his wireless communication systems.1
In this device, the arrival of a radio signal caused a change in the magnetization of a moving band of iron wires. This change in magnetization triggered a click in a connected telephone receiver, allowing for the detection of transmitted signals.1