London's Pulse: Medical Officer of Health reports 1848-1972

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Hints from the Health Department. Leaflet from the archive of the Society of Medical Officers of Health. Credit: Wellcome Collection, London

Heston and Isleworth 1930

[Report of the Medical Officer of Health for Heston and Isleworth]

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6
At the instigation of the Chief Engineer, the Board's officials
took samples from some taps throughout the building. Sir
Thomas Houston's reports on these were as follows:—
" M.B.W.2.—These were mixed together, and the combined
chlorides (expressed in chlorine) determined and found
to be 2.6, instead of 1.5, as in the case of the Board's water.
This proves conclusively that some other water (? canal water)
other than that of the Board was entering the system of
supply."
Sir Thomas Houston kindly furnished me with the analysis of
the Grand Junction (Hampton) water around the period of the
outbreak, which are as follows :