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
Feltham 1947
[Report of the Medical Officer of Health for Feltham]
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(Parts per million.)
| Appearance: Clear and bright. | |
| Turbidity (Silica Scale) | Nil |
| Colour (Hazen) Faint yellow brown on the alkaline side | 11 |
| Odour | Nil |
| Refection pH of neutrality | 7.9 |
| Free Carbon Dioxide | 3 |
| Electric Conductivity at 20°C | 475 |
| Total Solids, dried at 180°C | 320 |
| Chlorine in Chlorides | 22 |
| Alkalinity as Calcium Carbonate | 195 |
| Hardness: | |
| Total 275 Carbonate (Temporary) | 195 |
| Non-carbonate (Permanent) | 80 |
| Nitrogen in Nitrates | 3.8 |
| Nitrogen in Nitrites | Absent |
| Free Ammonia | 0.088 |
| Oxygen absorbed in 4 hrs at 27°C | 1.60 |
| Albuminoid Ammonia | 0.056 |
| Free Chlorine Reaction | 0.32 |
| Metals: | |
| Iron: Less than | 0.03 |
| Other metals | Absent |
Bacteriological
Number of
Colonies developing
on
Agar per e.c. 1 day at 37°C 2 days at 37°C 3 days at 37°C
qr ml. in 17 24 9
Presumptive Coliform Reaction Absent from 100 ml.
Bact. coli. Absent from 100 ml.
CI. welchii Reaction Present in 100ml. Absent from 10 ml.
This sample is clear and bright in appearance,
practically neutral in reaction and free from metals
apart from a negligible trace of iron. The water is hard
in character but not to an excessive degree and it contains