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 7
AVERAGE RESULTS OP THE CHEMICAL AND BACTERIOLOGICAL EXAMINATION OF THE WATER SUPPLY TO THE BOROUGH OF TWICKENHAM
FOR 1959
Milligrammes per litre (unless otherwise stated)
Description of the Sample | No. of Samples | Ammonia Nitrogen | Albuminoid Nitrogen | Oxidised Nitrogen (Nitrate) | Chlorides as Cl. | Oxygen abs. from Permanganate 4 hrs. at 27ºC | Turbidity in terms of Silica | Colour, mm. brown 2ft. tube Burgess's Tintometer | Hardness (Total) | Hardness (Non-carbonate) | pH Value | Phosphate as PO4 | Silicate as SiO2 | Sulphate as SO4 | Fluoride as F | Magnesium as Mg | Electrical Conductivity (gemmhos) |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Hampton | 52 | .022 | .075 | 3.8 | 28 | 1.08 | 0.4 | 10 | 250 | 56 | 7.7 | 0.95 | 9 | 54 | 0.2 | 4.0 | 525 |
Description of the Sample | No. of Samples | Agar Plate count per millilitre | Coliform count Percentage samples negative in 100 ml. | ||
---|---|---|---|---|---|
37°C 20-24 hrs. | 3 days at 22°C | Coliform | E.Coli | ||
Hampton | 976 | 6.7 | — | 100.0 | 100.0 |