Caption:
Pictures of the lines of flux around an oscillating dipole from the original paper of Heinrich Hertz. 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.