Correspondence from G.C. Simpson and M. Taylor to Edward Appleton, 1933 and 1931

Correspondence from G.C. Clarke to Edward Appleton, 1933 and from M. Taylor to Edward Appleton, 1931. The correspondence from Clarke contains critical comment on Appleton's and Naismith's paper, 'Weekly measurements of upper atmospheric ionization', Proceedings of the Physical Society of London, 45 (see correspondence from Watson-Watt in Coll-37/C.27).