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
Wembley 1935
[Report of the Medical Officer of Health for Wembley]
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CHEMICAL AND BACTERIOLOGICAL WATER REPORTS.
| Sample of Water-Public Swimming Bath (Sudbury). (2.7.1935) | Sample of "Water— Swimming Pool (Empire Pool). (19.7.1935) | |||
|---|---|---|---|---|
| Parte per 100,000 | Grains per Gallon | Parts per 100,000 | Grains per Gallon | |
| CHEMICAL. | ||||
| Total solids (dried at 1200C.) | 51.90 | 36.33 | — | — |
| Solids in solution | — | — | 65.9 | 46.1 |
| Solids in suspension | — | — | — | — |
| Combined chlorine | 13.0 | 9.1 | 13.6 | 9.5 |
| equivalent to Na Cl | 21.5 | 15.1 | 22.4 | 15.7 |
| Nitric nitrogen (Nitrates) | 0.68 | 0.48 | 0.44 | 0.31 |
| Nitrous nitrogen (Nitrites) | Nil | Nil | trace present. | |
| Amoniacal nitrogen | 0.180 | 0.126 | 0.155 | 0.109 |
| Albuminoid nitrogen | 0.040 | 0.028 | 0.029 | 0.020 |
| Oxygen absorbed in 4 hour at 270C | 0.065 | 0.046 | 0.057 | 0.040 |
| Lead or Copper | — | — | — | — |
| Temporary hardness (equivalent to CaCo3) | 3.3 | 2.3 | — | — |
| Permanent hardness | 14.3 | 10.0 | — | — |
| Total hardness | 17.6 | 12.3 | — | — |
| BACTERIOLOGICAL | ||||
| Average number of organisms producing visible colonies on gelatine plates, incubated at 200—220C. for 3 days= | 530 per c.c. | 9 per c.c. | ||
| Average number of organisms producing visible colonies on agar plates, incubated at 37.50C. for 2 days = | 4 per c.c. | 4 per c.c. | ||
| B. Coli. | Not found in 100 c.c. | Not found in 100 c.c. | ||
| Streptococci. | Not found in 30 c.c. | Not found in 30 c.c. | ||
| B. Welchii (spores). | Not found in 100 c.c. | Not found in 100 c.c. | ||
| BACTERIOLOGIST'S REMARKS. | The chemical analysis shews evidence of contamination, but the bacteriological examination is satisfactory, shewing that the chlorination has been efficient. The water gave a distinct reaction for free chlorine and may be regarded as fit for bathing purposes. | Free chlorine was present in the sample on arrival at the laboratory and was found to amount to 0.33 parts per million. These results shew this water to be satisfactory for bathing purposes. | ||