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 Feltham]
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Average Results of Analyses of Metropolitan Water Board Supply. (Parts per million.) Water filtered and chlorinated at Hampton Works:
No. of Samples | 244 |
Ammoniacal Nitrogen | .016 |
Albuminoid Nitrogen | .091 |
Oxidised Nitrogen (Nitrate) | 4.1 |
Chlorides as Cl. | 25.8 |
Oxygen abs. from Permanganate 3 hours at 80°F | 1.18 |
Turbidity in terms of Silica | 0.4 |
Colour m.m. brown 2ft. tube Burgess's Tintometer | 16 |
Hardness Total | 274 |
Hardness (Permanent) | 83 |
pH Value | 7.9 |
Conductivity | 475 |
Bacteriological Results | |
No. of Samples | 817 |
Colony Count on agar at 37°C (20-24 hours) | 6.9 |
BACT. COLI TEST | |
Percentage of samples negative per 100 ml. | 99.9 |
Bact. Coli per 100 ml. | .002 |
Typical Analysis of South West S.W. Co. Supply.
(Parts per million.):
Chemical
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 |