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
Walthamstow 1935
[Report of the Medical Officer of Health for Walthamstow]
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Bacteriological and chemical analyses were carried out on four occasions with the results given in the following table (samples 4-7), from which it will be noted that all the four samples were quite satisfactory.
| Number of Samples. | MUNICIPAL BATHS. | KINGFISHERS POOL. | |||||
|---|---|---|---|---|---|---|---|
| (1) | (2) | (3) | (4) | (5) | (6) | (7) | |
| 24.6.35 | 8.7.35 | 22.8.35 | 24.6.35 | 8.7.35 | 25.7.35 | 22.8.35 | |
| Colonies on agar at 370C (24 hrs.) per c.c | — | 2 | 6 | — | - | — | 9 |
| ,, ,, ,,(48 hrs.) | 195 | 7 | 20 | 230 | 2 | 3 | 98 |
| ,, „ 20OC (72 hrs.) | — | 7 | 180 | — | 3 | 18 | 320 |
| ,, gelatine at 22 C (72 hrs.) ,, | 341 | — | — | 247 | — | — | — |
| Bacillus coli | —50 c.c. | —100 c.c. | —100 c.c. | —50 c.c. | -f 100—50c.c. | —100 c.c. | —100 c.c. |
| ,, welchii | - | + 100 c.c. -—10 c.c. | —100 c.c. | — | —100 c.c. | —100 c.c. | —100 c.c. |
| Streptococci | — | —10 c.c. | —10 c.c. | — | —10 c.c. | —10 c.c. | —10 c.c |
| Appearance | — | Clear and bright | Clear and bright | — | Clear and bright | Bright | Bright |
| Colour | — | Normal | Normal | — | Normal | Normal | Normal |
| Cdour | — | Slight earthy | Faint earthy | — | Faint earthy | Faint earthy | Faint earthy |
| Reaction (pH) | 8.5 | 7.8 | 7.8 | 8.5 | 7.4 | 7.5 | 7.2 |
| Electrical conductivity (20OC) | — | 935 | 855 | _ | 855 | 900 | 930 |
| Total solids (180OC) | 54.4 | 62.5 | 57.0 | 68.7 | 57.0 | 60.0 | 62.0 |
| Chlorine as chlorides | 9.7 | 10.8 | 11.2 | 13.6 | 18.0 | 14.8 | 20.4 |
| Free chlorine | — | 0.02 | 0.015 | — | 0.005 | 0.015 | 0.02 |
| Nitrogen as nitrates | 0.45 | 0.52 | 0.56 | 0.20 | 0.76 | 0.54 | 0.84 |
| ,, ,, nitrites | Nil | Nil | Nil. | T race | Nil. | Nil. | Nil. |
| Hardness:—Permanent | . — | 7.5 | 11.5 | — | 26.0 | 24.0 | 24.0 |
| Temporary | — | 15.0 | 9.5 | — | 2.0 | 2.0 | 1.0 |
| Total | 22.4 | 22.5 | 21.0 | 24.4 | 28.0 | 26.0 | 25.0 |
| Poisonous metals | Nil | Nil. | Nil. | Nil. | Nil. | Nil. | Iron 0.005 |
| Free ammonia | 0.006 | 0.0006 | 0.0026 | 0.014 | 0.0036 | 0.0022 | 0.0128 |
| Albuminoid ammonia | 0.08 | 0.0094 | 0.0094 | 0.10 | 0.0104 | 0.011 | 0.0166 |
| Oxygen absorbed in 4 hrs. at 270C | 0.80 | 0.065 | 0.060 | 0.81 | 0.0450 | 0.06 | 0.05 |
Note:—Samples 1 and 4 were done at a different laboratory from the others. Sample 6 was done by arrangement with the Essex County Council.