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
Twickenham 1953
[Report of the Medical Officer of Health for Twickenham]#
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Results of the Chemical and Bacteriological Examination of the Water Supply to the Borough of Twickenham
for 1953.
Parts per million (unless otherwise stated).
| Description of the Sample | Number of Samples | Ammoniacal Nitrogen | Albuminoid Nitrogen | Oxidised Nitrogen (Nitrate) | Chlorides as c1 | Oxygen abs. from Permanganate 4 hrs. at 27°c. | Turbidity, in terms of Silica | Colour, m.m. brown, 2 ft. tube, Burgess's Tintometer | Hardness (total) | Hardness (Non.carb.) | pH. Value | Phosphate as P.O.111/4 | Silica as SiO2 | Conductivity |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| River Thames water filtered at Hampton Works | 234 | 0.008 | 0.077 | 3.5 | 26.6 | 1.04 | 0.3 | 13 | 263 | 64 | 7.9 | 0.62 | 11.0 | 500 |
Table 9.
| Description of the Sample | Number of Samples | Plate count (average per milli-litre) Colonies counted on agar after 20-24 hrs. at 37°c. | Bad. coli test | |
|---|---|---|---|---|
| Percentage of samples negative in 100 ml. | Average number of Bact. coli per 100 ml. | |||
| River Thames water filtered at Hampton Works | 873 | 6.0 | 99.8 | 0.004 |