Assertion: radio wave | /r/CreatedBy | heinrich hertz
Facets:
value: in 1887
type: TEMPORAL
value: deliberately
type: MANNER
Source sentences:
text: Radio waves were first produced deliberately by Heinrich Hertz in 1887, using electrical circuits calculated to produce oscillations at a much lower frequency than that of visible light, following recipes for producing oscillating charges and currents suggested by Maxwell's equations.