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An historical illustration of radio waves. Heinrich Rudolf Hertz (1857-1894) discovered radio waves in 1886-1889. He used Maxwell's theories to construct an oscillating electrical circuit with a spark gap. With such a circuit, Maxwell had predicted that electromagnetic radiation would be produced. Hertz showed this to be correct, and devised a loop antenna to detect the waves. He was also able to show that these waves travelled at the speed of light.
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