Smoke. Use in an Invasion of Great Britain. Report

5. The probable number of days in July+ (based on average figures for the period 1929-1938) when meteorological conditions are likely to be favourable for the projection of such a smoke cloud, and the known maximum figure for any July during the same period, are as follows:Area from Area of Probable number Maximum which smoke English of days when figure in screen coast on meteorological any July might be which conditions are during the emitted. smoke likely to be period screen favourable. 1929-1938.