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Correspondence and data and notes on seasonal variations, 1936-1937 and no date
The material consists of correspondence and data on seasonal variations, enclosing graphs of Slough observations for 1936, from R. Naismith, dated 1937; and 1 page of notes by L.J. Ingram, annotated by Appleton, no date.
Manuscript notes and research ideas by Edward Appleton , c. 1930s-1945
The materia consists of manuscript notes and research ideas by Edward Appleton. It is undated, but the data covers various years to 1945, and some notes refer to the comparison of observations at Delhi and Baton Rouge (see Clark, Ronald, Sir Edward Appleton, p. 151). Included is a letter from R. Naismith, April 1944 regarding comparative figures for Delhi and Sydney and including manuscript charts of data for Delhi, dated 1942-1943.