The material consist of a comment on a Japanese paper on radio transmission, with diagrams, sent with a covering letter by W.G. Beynon, dated October 1940 and comments on another paper on transmission, by Beynon and Piggott, dated 1940.

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.

Brief correspondence between W.J.G. Beynon and Edward Appleton, dated January 1956-March 1956.

Correspondence from D.F. Martyn to Edward Appleton, dated 1946. The correspondence is mainly regarding a paper by Martyn on Solar tides, submitted to Appleton for communication to the Royal Society. The material includes comments on Martyn's paper by W.J.G. Beynon 1947, and an enthusiastic letter by S. Chapman, 1946 and Appleton's notes on papers by Martyn on atmospheric tides, given at a meeting of the Mixed Commission on the Ionosphere, 1948.

Correspondence from H.D. Poole to Edward Appleton, dated 1939-1940. The material includes correspondence on Poole's theories from W.J.G. Beynon, dated October 1939.

Correspondence from J. Bartels Edward Appleton dated 1938 and W.J.G. Beynon to Edward Appleton dated 1949. The correspondence from Beynon is regarding a paper in Nature and includes data.

Correspondence between L. d'Azambuja with Edward Appleton, dated 1947, includes a photograph dated July 1946; between W.G. Beynon and Appleton, dated 1946 and 1948; and between L.C.B. Blanchard and Appleton, dated 1945-1946, including data on the ‘hissing phenomenon’, dated 1941 and 1944.