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John Henry Pepper demonstrating the giant induction coil at the Polytechnic Institute, London, before Princesses Louise and Beatrice
ARP23A18_002

John Henry Pepper demonstrating the giant inductio...

Heinrich Daniel Ruhmkorff
ARP23A12_073

Heinrich Daniel Ruhmkorff

Heinrich Hertz's oscillator, right, showing path of wave reflected from metal surface at left
ARP23A18_250

Heinrich Hertz's oscillator, right, showing path o...

Heinrich Hertz's oscillator
ARP23A18_249

Heinrich Hertz's oscillator

The first TRANSFORMER: The iron ring is wound with two separate coils of wire, A and B. Both coils are wired in sections. Current through A from a battery induces a current in B. Engraving after a ske...
ARP17A30_477

The first TRANSFORMER: The iron ring is wound with...

Faraday's experiment
ARP07103_460000304

Faraday's experiment

Guglielmo Marconi pionnier des transmissions par radio
ARP07093_390000082

Guglielmo Marconi pionnier des transmissions par r...