Edward Appleton's notes and drafts, c. 1938-1941

Edward Appleton's notes and drafts. The material consists of a folder containing; two extensive manuscript sequences, written in pencil and in ink, on absorption, perhaps for a paper with marginal comments in the hand of W.R. Piggott, no date, c.1938-39; 'Note on the results of oblique incidence transmission', a typescript note, dated 1941; ‘A sketch of a general theory of ionospheric absorption', a manuscript note, no date, written on wartime paper; and some shorter notes.