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
City of London 1969
[Report of the Medical Officer of Health for London, City of ]
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Milligrammes per litre (unless otherwise stated)
| Description of the Sample | Number of Samples Day of the month | Ammoniacal 1 Nitrogen | Albuminoid Nitrogen | Nitrate Nitrogen | Oxygen abs. from KMn04 4 hrs at 27° C. | B.O.D. 5 days at 20° C. | Hardness (total) CaC03 | Hardness (non-carbonate) CaC03 | Magnesium as Mg | Sodium as Na | Potassium as K | Chloride as CI | Phosphate as P04 | Silicate as Si02 | Sulphate as S04 | Natural Fluoride as F | Surface-active material as Manoxol OT | Turbidity units | Colour (Burgess units) | PH value | Electrical Conductivity (micromhos) | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) | (11) | (12) | (13) | (14) | (15) | (16) | (17) | (18) | (19) | (20) | (21) | (22) | (23) |
| Stoke Newington | 53 | 0.015 | 0.059 | 4.7 | 0.62 | 314 | 84 | 5 | 30.8 | 5.3 | 41 | 1.7 | 10 | 68 | 0.25 | 0.02 | 0.0 | 7 | 7.9 | 630 | ||
| R.Thames — Derived | 371 | 0.024 | 0.083 | 4.4 | 1.05 | 282 | 79 | 5 | 24.0 | 5.4 | 32 | 2.1 | 9 | 58 | 0.25 | 0.02 | 0.1 | 1 1 | 7.9 | 550 |
| Source of Supply | BEFORE TREATMENT | AFTER TREATMENT | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Number of samples | Agar plate count per ml. | Coliform count | Escherichia coli count | Number of samples | Agar plate count per ml. | Coliform count | E. coli count | |||||
| 20-24 hours at 37°C. | 3 days at 22° C. | Per cent, samples negative in 1 00 ml. | Count per 1 00 ml. | Per cent, samples negative in 100 ml. | Count per 1 00 ml. | 20-24 hours at 37 °c. | 3 days at 22° C. | Per cent, samples negative in 100 ml. | Per cent, samples negative in 100 ml. | |||
| Stoke Newington | 752 | 38.7 | 59.31 | 2.6 | 75.27 | 0.6 | 257 | 18.0 | 100.0 | 100.0 | ||
| River Thames — derived | 8.196 | 66.5 | 39.79 | 19.0 | 53.97 | 7.0 | 3,698 | 12.9 | 99.89 | 100.0 | ||