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
Lewisham 1903
[Report of the Medical Officer of Health for Lewisham]
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103
These samples were analysed, and the following results
obtained:—
Results of Analyses of Samples of Water, etc.
| Constituents. | Sample No. | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | ||
| Free or Saline Ammonia | .50 | .53 | .025 | .025 | .0025 | .012 | .480 | .0025 | .012 | |
| Albuminoid Ammonia | .185 | .09 | .022 | .020 | .017 | .022 | .055 | .006 | .026 | |
| Chlorines as Chlorides | 6.25 | 5.6 | 2.3 | 3.5 | 2.1 | 1.4 | 4.9 | 3.4 | 2.6 | |
| Nitrogen as Nitrates | .35 | .42 | .224 | .175 | .126 | .042 | .084 | .42 | .42 | |
| Nitrogen as Nitrites | .14 | .035 | Nil. | Nil. | Nil. | Nil. | .192 | Trace | Trace | |
| Oxygen absorbed in ten minutes at 100° C. | in acid solution | 2.06 | 1.002 | .180 | .334 | .263 | .194 | 1.042 | .360 | .251 |
| in alkaline solution | 1.68 | 1.029 | .181 | .306 | .276 | .253 | .835 | .235 | .130 | |
| Total Solids | 68.0 | 62.0 | 40.0 | 47.5 | 25.0 | 23.0 | 52.0 | 38.0 | 37.0 | |
| Total Hardness | 21.5 | 21.5 | 21.0 | 19.6 | 15.2 | 13.8 | 19.4 | 14.4 | 19.7 | |
| Permanent Hardness | 4.9 | 6.6 | 5.3 | 11.5 | 4.4 | 2.7 | 2.5 | 3.1 | 4.0 | |
| Colour | Very distinct Brown. | Distinct Brown. | Very ' Pale Brown. | Pale Brown. | Very Pale Brown. | Greenish Brown. | Distinct Brown. | Very Pale Brown. | Very Pale Brown. | |
| Remarks | Alkaline. | Slightly Alkaline. | Very slightly Alkaline. | Very slightly Alkaline. | Very slightly Alkaline. | Very slightly Alkaline. | Slightly Alkaline. | Very slightly Alkaline. | Very slightly Alkaline. | |
Note.—Results of Analyses expressed in grains per gallon.