Correspondence from R. Naismith to Edward Appleton, 1943, 1980

Correspondence from R. Naismith to Edward Appleton, dated 1943. The material includes a draft report on 'Radio Communication over high latitudes' (February), and a letter and graphs on noon values (August). This has a note appended by Dr. J. King (1980) 'This letter shows that Appleton was aware in mid-1943 that the foF₂ values around latitude 30°N were abnormally high. For more details see also letter from Naismith dated 11/X/1944’ (in Coll-37/E.79)