Hints from the Health Department. Leaflet from the archive of the Society of Medical Officers of Health. Credit: Wellcome Collection, London
[Report of the Medical Officer of Health for London County Council]
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Fig. 1.—Diagram 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 1935.
Fig. 2.—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 1935 and 1930-34 ; and observations taken from a sludge vessel at places
east of the Nore light during 1935.