Kennelly, Arthur Edwin (1861–1939)
US electrical engineer. In 1902 Guglielmo Marconi
had experimented with radio waves. Kennelly noticed that the waves could
reach beyond the Earth's horizon. He proposed that they did this by bouncing
off a layer of ions high in the atmosphere. The British physicist Oliver
Heaviside made a similar proposition,
and the layer was called the Kennelly-Heaviside layer (now
known as the E-layer). It is found in the ionosphere.