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 Westminster 1971
[Report of the Medical Officer of Health for Westminster, City of]
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Table 15.—Rodent Control
| Complaints: | 1971 | 1970 |
|---|---|---|
| Complaints of rats received | 449 | 517 |
| Complaints of mice received | 2,815 | 2,193 |
| Total premises involved | 3,264 | 2,710 |
| (Including properties inspected for reasons other than notification) | ||
| Premises rid of rats | 451 | 527 |
| Premises rid of mice | 2,802 | 2,195 |
| Total premises disinfested | 3,253 | 2,722 |
| Inspections by Public Health Inspectors and visits by Rodent Officers to such places | 3,782 | 3,613 |
| Intimation notices served | — | — |
| Statutory notices served | 13 | 2 |
Table 16.—Chemical Examination of Water Supplied to City of Westminster—Average Results Milligrammes per litre (unless otherwise stated)
| Analysis Data | Source of Supply | |
|---|---|---|
| Stoke Newington | R. Thames -Derived | |
| Ammoniacal Nitrogen | 0.027 | 0.029 |
| Albuminoid Nitrogen | 0.064 | 0.084 |
| Nitrate Nitrogen | 6.3 | 6.1 |
| Oxygen abs. from KMn02 4 hrs. at 27°C | 0.61 | 1.04 |
| Hardness (total) CaC03 | 304 | 281 |
| Hardness (non-carbonate) CaC03 | 85 | 90 |
| Magnesium as Mg | 5 | 5 |
| Sodium as Na | 30.3 | 23.5 |
| Potassium as K | 5.2 | 5.1 |
| Chloride as CI | 42 | 34 |
| Phosphate as PO4 | 1.9 | 2.3 |
| Silicate as SiO2 | 9 | 10 |
| Sulphate as SO4 | 62 | 64 |
| Natural Fluoride as F | 0.20 | 0.15 |
| Surface-active material as Manoxal OT | 0.02 | 0.02 |
| Turbidity units | 0.1 | 0.1 |
| Colour (Burgess units) | 9 | 13 |
| pH value | 75 | 7.8 |
| Electrical Conductivity (microhms) | 630 | 580 |