Audio recording of Edward Appleton at the U.R.S.I [Union Radio-Scientifique Internationale] conference, Sydney, parts 3 and 4 (of 4), August 1952

The material consists of a gramophone audio recording of Edward Appleton parts 3 and 4 (of 4). It is labelled, 'A.B.C. [Australian Broadcasting Corporation?] Guest of Honour Sir Edward Appleton August, 1952’ and ‘Recorded at 78 r.p.m. [revolutions per minute] from tape. Use lightweight pickup'. The original tape was recorded at the U.R.S.I [Union Radio-Scientifique Internationale] conference, Sydney, 1952.