Correspondence between W.J.G. Beynon and Edward Appleton, dated 1949-1950. The material relates to U.R.S.I [Union Radio-Scientifique Internationale] and M.C.I. [Mixed Commission on the Ionosphere] affairs, publications, meetings, etc.

The material relates to U.R.S.I. [Union Radio-Scientifique Internationale] and M.C.I. [Mixed Commission on the Ionosphere] affairs, including Third Polar Year proposed for 1957-1958 and some research matters are discussed. There is also included a U.R.S.I. report on 'Terminology and units' with a letter from D.F. Martyn.

Correspondence between W.J.G. Beynon and Edward Appleton, dated 1953. The material includes reports by Beynon on M.C.I. [Mixed Commission on the Ionosphere] meeting at Canberra in August 1952, and on the meeting on the International Geophysical Year at Brussels, July 1953, information on next meeting of the M.C.I. in Brussels, 1954, etc.

Correspondence between W.J.G. Beynon and Edward Appleton, dated 1955. The material relates to U.R.S.I. [Union Radio-Scientifique Internationale] and M.C.I. [Mixed Commission on the Ionosphere] affairs, organisation of I.G.Y. [International Geophysical Year] and arrangements for the meeting in the U.S.A. in 1957. It includes and offprint of an article on I.G.Y. by Appleton from The Times, 17 January.

Correspondence from Cable and Wireless to Edward Appleton; correspondence from A. Copisarow to Appleton, including draft report; and correspondence from N. Corry to Appleton. All material is dated 1946.

Correspondence from D.W. Heightman to Edward Appleton. Heightman was a radio broadcaster (G6DH) who observed the 'hissing phenomenon' in 1936 and corresponded with Appleton, and with Wireless World, on the subject. In 1945, further correspondence ensued and Heightman's letter of 6 July 1945 encloses observations noted 1936-39. Appleton acknowledged Heightman's early observations in some of his later writings on solar noise.

The material consists of correspondence from J.P.V. Madsen to Edward Appleton, dated 1949; from G. Marconi to Appleton, no date, consist of a photocopy of a letter, offering to prepare receiving apparatus for a lecture demonstration; from F. Mariani to Appleton, dated 1958; and from D.C. Martin to Appleton, dated 1956.

Correspondence from L.S. Harley to Edward Appleton, dated 1945. The material includes comments on a draft broadcast script by Appleton, on radar.

Correspondence between the British Broadcasting Corporation and Edward Appleton. The material consists of correspondence and data from BBC radio engineers and stations with Appleton on the 'hissing phenomenon’, dated 1942, 1945-1946 and including data from 1937-1941.

Correspondence from T.W. Bennington to Edward Appleton, dated 1958-1959. The material relates to various research projects, and to accompany data in Coll-37/E.8, dated 1957-1961, sent by the B.B.C. Research Department.