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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Diagram showing the mean (in miles) of the greatest distance at which objects could
bedistinguished at mid-day from the fleche at county hall. during 1932 and 1927-1931
Diagram showing the mean (in miles) 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 summer months and during the whole year, 1932 and 1927-1931.