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 Twickenham]
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TABLE 9.
Results of the chemical and bacteriological examination of the water supply to the borough of twickenham
for 1950.
Parts per million (unless otherwise stated).
Description of the Sample | Number of Samples | Ammoniacal Nitrogen | AIbuminoid Nitrogen | Oxidised Nitrogen (Nitrate) | Chlorides as cl | Oxygen abs. from Permanganate 3 hrs. at 80° F. | Turbidity, in terms of Silica | Colour, m.m. brown, 2 ft. tube, Burgess's Tintometer | Hardness (total) | Hardness (permanent) | pH. Value | Phosphate as P.O. | Silica as SiO2 | Conductivity | ||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
River Thames water filtered at Hampton Works | 244 | 0.016 | 0.091 | 4.1 | 25.8 | 1.18 | 0.4 | 16 | 274 | 83 | 7.9 | 0.41 | 11.0 | 475 | ||
(b) Bacteriological. | ||||||||||||||||
River Thames water filtered at Hampton Works | 817 | 6.9 | 99.9 | 0.002 |