Correspondence from E.J. Williams to Edward Appleton, 1938-1939

Correspondence from E.J. Williams to Edward Appleton, dated 1938-1939. The material includes comments on early observations of 'hissing phenomenon' by D. Heightman (see Coll-37/C.337). Also enclosed is a copy of Radio Society of Great Britain's T. and R. Bulletin [Transmitter and Relay], July 1939, with an analysis by Williams of Heightman's and others' observations, sent by the secretary in response to Appleton's request for information. E.J. Williams is probably Evan James Williams (1903-1945), a Welsh experimental physicist.