Hardback 'Minute Book', c. 1930-1948

Hardback 'Minute Book'. The notebook has pages numbered 1-197 however only 1-107 have been used. It contains notes of a very heterogeneous nature, probably begun c. 1930 and continuing to 1948. It includes notes on the literature, notes for experiments or of discussions, ideas on various aspects of ionospheric research, p.85 contains very brief notes for the 'Bakerian Lecture' (given in 1937).