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 1949
[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.
Parts per million (unless otherwise stated).
Table 9.
| Description of the Sample | Number of Samples | Ammoniacal Nitrogen | Albuminoid Nitrogen | Oxidised Nitrogen | Chlorides as CI | 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 Si.0 | Conductivity |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| River Thames water filtered at Hampton Works | 250 | 0.015 | 0.087 | 4.3 | 27.4 | 1.13 | 0.4 | 14 | 244 | 71 | 7.7 | 39 | 11.3 | 450 |
| Description of the Sample | Number of Samples | Number of Microbes per ml. Colonies counted on agar after 20-24 hours at 37° C. | Bad. coli test | |
|---|---|---|---|---|
| Number of samples negative to Bact. coli in 100 ml. | Bact. coli per 100 ml. | |||
| River Thames water filtered at Hampton Works | 980 | 7.5 | 99.7 | 0.006 |