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
Chislehurst 1953
[Report of the Medical Officer of Health for Chislehurst]
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Parts per Million (unless otherwise stated).
| Orpington Well | North Orpington Well | Short-lands Well | Eyns-ford Well | Bexley Well | Wilmington Well | Darenth Well | Thames derived filtered waterp | |
|---|---|---|---|---|---|---|---|---|
| Number of samples | 4 | 2 | 8 | 3 | 4 | 8 | 4 | 1766 |
| Ammoniacal Nitrogen | Nil | 0.003 | 0.003 | 0.003 | 0.005 | 0.007 | Nil | 0.012 |
| Albuminoid Nitrogen | 0.025 | 0.028 | 0.022 | 0.022 | 0.021 | 0.023 | 0.018 | 0.081 |
| Oxidised Nitrogen—Nitrite | — | — | — | —_ | — | — | — | — |
| Oxidised Nitrogen—N itrate | 6.7 | 4.2 | 4.7 | 3.4 | 4.8 | 6.8 | 4.9 | 3.3 |
| Chlorides as CI | 15.4 | 13.3 | 15.5 | 14.5 | 16.1 | 19.7 | 15.1 | 26.8 |
| Oxygen abs. from Permanganate 4 hrs. at 27°C. | 0.09 | 0.02 | 0.12 | 0.07 | 0.06 | 0.12 | 0.10 | 1.02 |
| Turbidity in terms of Silica | Nil | Nil | Nil | Nil | Nil | Nil | Nil | 0.2 |
| Colour, m.m. brown 2 ft. tube, Burgess's Tintometer | Nil | Nil | Nil | Nil | Nil | Nil | Nil | 12 |
| Hardness (Total) | 281 | 259 | 283 | 265 | 284 | 293 | 264 | 259 |
| Hardness (Permanent) Non-Carbonate | 47 | 34 | 68 | 41 | 54 | 59 | 34 | 64 |
| PH Value | 7.2 | 7.3 | 7.2 | 7.3 | 7.3 | 7.2 | 7.2 | 7.9 |
| Magnesium | 3.1 | 3.0 | 3.9 | 3.2 | 3.9 | 3.7 | 3.3 | 4.0 |
| Silica as Si02 | 15 | 15 | 16 | 15 | 18 | 20 | 16 | 10 |
| Sulphate | 15 | 4 | 41 | 13 | 30 | 15 | 11 | 49 |
| Oxygen saturation % | — | — | — | — | —_ | — | — | — |
| B.O.D. 5 days at 65°F. | — | — | — | — | — | — | — | — |
| Conductivity | 500 | 500 | 500 | 425 | 450 | 500 | 450 | 500 |