Illustration depicting Heinrich Hertz's experiment on electromagnetic waves: Hertz's oscillator. Terminals of an induction coil (bottom left) were connected to condenser A, B. Initial spark passing between metal balls at centre, A,B, formed a path for subsequent oscillations which were measured. Heinrich Hertz (1857-1894) a German physicist who conclusively proved the existence of the electromagnetic waves theorised by James Clerk Maxwell's electromagnetic theory of light. Dated 20th century

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Keywords: 20th, archival, archive, century, coil, condenser, demonstration, electromagnetic, experiment, experimentation, german, heinrich, hertz, historical, history, illustrated, illustration, induction, metal, oscillations, physicist, physics, rudolf, spark, waves