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Abstract
The practical verification af the theories associated with atmospheric attenuation in other than idealized stable weather conditions and the measurement of visibility under field conditions can be difficult. This is due to the usual requirement for observations to be made at a number of ranges against acceptably “standard” objects whilst the atmospheric transmission remains tolerably constant. Previous papers in this series have shown how a kine photographic system can be reliably used to measure bright, less (I. 2). This paper discusses techniques whereby such a system may be used to study in detail the lows of atmospheric attenuation and as a ready means of recording visibility when measurements by conventional methods are not very practical. The discussion is illustrated with the results of studies and measurements already carried out.