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 Poplar, Metropolitan Borough]
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Fig. 2. The Saturators in Situ.
One, containing solution of sodium chloride, the other a solution of magnesium
chloride, from which the large supply tank (shewn in Fig. 1) is supplied.