Heaviside, Oliver h?v?s?d? [key], 1850?1925, English physicist. He did valuable work in telephony and in the theory of electrical conduction in cables and other areas of electric theory. He suggested (1902) the existence of a layer in the upper atmosphere responsible for altering the path of certain radio waves and thus making possible long-distance transmission of signals. The same conclusion was reached independently by Arthur E. Kennelly; its existence was proven, and it is known both as the Kennelly-Heaviside layer and as the Heaviside layer. See ionosphere.
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