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 1949
[Report of the Medical Officer of Health for Feltham]
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10
Typical Analysis of South West S.W. Co. Supply.
(Parts per million.)
Appearance: Clear and bright.
| Turbidity (Silica Scale) | Nil |
| Colour (Hazen) Faint yellow brown on the alkaline side | 10 |
| Odour | Nil |
| Reaction pH of neutrality | 7.7 |
| Free Carbon Dioxide | 6 |
| Electric Conductivity at 20°C | 550 |
| Total Solids, dried at 180°C | 370 |
| Chlorine in Chlorides | 27 |
| Alkalinity as Calcium Carbonate | 205 |
| Hardness: | |
| Total 280 Carbonate (Temporary) | 205 |
| Non-carbonate (Permanent) | 75 |
| Nitrogen in Nitrates | 4.4 |
| Nitrogen in Nitrites | Absent |
| Free Ammonia | 0.016 |
| Oxygen absorbed in 4 hrs. at 27°C | 1.1 |
| Albuminoid Ammonia | 0.084 |
| Residual Chlorine | Absent |
| Metals | Absent |
Bacteriological
Number of
Colonies developing
on
Agar per c.c. 1 day at 37°C 2 days at 37°C 3days at20°C
or ml. in 4 7 2
Piesumptive Coliform Reaction Absent from 100 ml.
Baet. coli. Absent from 100 ml.
Cl. welchii R faction Present in 100ml. Absent from 10 ml.
This sample is clear and bright in appearance, has
a reaction on the alkaline side of neutrality and is free
from metals. The water is hard in character but
its hardness and its content of mineral and saline