Correspondence, data and research notes, 1957-1959

Correspondence, data and research notes, dated 1957-1959. The material consists of exchanges between Edward Appleton and C.P. Bell, who was at that time a research student working with W.E.J. Farvis in the Department of Electrical Engineers at Edinburgh. In early 1957, a serious road accident interrupted Bell's research, and during his convalescence and recovery, he assisted Appleton with data analyses and mathematical calculations for various projects, and in particular with research on seasonal variations in critical frequencies in atmospheric layers. Some of the correspondence refers to the progress of Bell's recovery. Comments and notes by Farvis can be found in Coll-37/C.157 and Coll-37/C.165.