Black hardback notebook, c. 1940-1953

Black hardback notebook. It contains notes, diagrams, calculations and narratives, from various periods, and including work on solar noise, 'relaxation time of the F₂ layer', 'Points on E and F', 'Distortion in the E layer', 'The Continuity Equation', etc. Work probably began c. 1940 and continued to c.1953.