THE SECRET LIFE OF MACHINES - The Video Recorder
by Tim Hunkin
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The principle of magnetic recording was invented by a Danish telephone engineer called Valdemar Poulsen in 1899. He used an electromagnet to record the tiny electric currents from a telephone to magnetise a steel wire. This recreated tiny currents in the electromagnet when it was replayed. All tape and video recorders still work this way.


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The Video Recorder cartoon

 

Cartoons copyright (C) 1988-1994 Tim Hunkin. All rights reserved.
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