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will be seen that on isolated occasions in the winter months visibility is fairly good
whilst occasional mists in summer greatly reduce visibility. This was marked in
June, when several misty days reduced the general visibility below that of either
July, August or September.
Fig. 2.—Diagrams showing the mean (in miles, international code numbers and the Meteorological
Office indication letters) of the greatest distance in the directions stated at which objects could be
distinguished at mid-day from the fleche at County Hall during the months of 1934.
Fig 3.—Diagram showing the mean (in miles, international code numbers and the Meteorological
Office indication letters) of the greatest distance, also the maximum and minimum distances, at which
objects could be distinguished at mid-day from the fleche at County Hall during 1934 and 1929-33 ;
and observations taken from the sludge vessel at places east of the Nore light during 1934.