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
Southall-Norwood 1933
[Report of the Medical Officer of Health for Southall-Norwood]
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Bacteriological.
No. of micro-organisms developing on Gelatin (aerobically)
at 68 clegs F (3 days) averaged 788 per c.c.
No. of micro-organisms developing on Agar (aerobically)
at 98 degs F (48 hours) averaged 12 per c.c.
Bacillus coli (typical) absent from 100 c.c of sample.
Coliform organisms—None.
Other organisms—Baccillus welchii absent from 100 c.c.
| Chemical. | Parts per 100,000 |
|---|---|
| Total solids dried at 120 degs C. | 36.40 |
| Combined chlorine | 2.80 |
| equivalent to NaCl | 4.62 |
| Nitric nitrogen | 0.45 |
| Nitrous nitrogen | |
| Ammonical nitrogan | 0.0006 |
| Albuminoid nitrogen | 0.0026 |
| Oxygen absorbed in 4 hours at 27 degs F. | 0.065 |
| Lead or copper | |
| Temporary hardness (equivalent to CaCo3) | 2.38 |
| Permanent hardness | 5.3 |
| Total hardness | 2.91 |
Bacteriological.
Average No. of organisms producing visible colonies on
gelatine, incubated at 20.22 degs (for 3 days—17 per c.c.
Average No. of organisms producing visible colonies on agar
plates, incubated at 37.5 deg C for 2 days—15 per c.c.
40