Assertion: radio wave | /r/CapableOf | travel beyond the horizon
Facets:
value: in the early 20th century
type: TEMPORAL
value: by marconi
type: OTHER
Source sentences:
text: The initial discovery that radio waves could travel beyond the horizon by Marconi in the early 20th century prompted extensive studies of ionospheric propagation for the next 50 years or so, which have yielded various HF link channel prediction tables and charts.