Hertz's electromagnetism experiments, 1880s

Numéro d’image : 12289423
Hertz's electromagnetism experiments, 1880s
Hertz's electromagnetism experiments. 19th-century illustration of the experiments on electromagnetism carried out in the 1880s by German physicist Heinrich Hertz (1857-1894). These experiments proved the existence of the electromagnetic waves theorised by James Clerk Maxwell. At lower left is a Ruhmkorff coil powering a spark transmitter with a dipole antenna and spark gap. The resulting radio waves can be detected by the receiver (loop antenna at centre). A prism made of pitch (upper left) was used to bend the radio waves (showing their similarity to light waves). At right is the apparatus for a directional transmitter, with a metal parabolic reflector and receiver, and a sheet of metal (far right) reflecting the radio waves. This illustration is from 'Physique Populaire' (Emile Desbeaux, 1891).
Licence : Droits gérés
Crédit: Science Photo Library
Taille de l’image : 4184 px × 4178 px
Model Release : Non requis
Property Release : Non requis
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