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
Orpington 1950
[Report of the Medical Officer of Health for Orpington]
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APPENDIX 6.
RESULTS OF THE CHEMICAL AND BACTERIOLOGICAL EXAMINATION OF THE WATER SUPPLY TO ORPINGTON FOR THE YEAR 1950.
PARTS PER MILLION (unless otherwise stated).
| Description of the Sample | No. of Samples | Ammo-niacal Nitrogen | Albuminoid Nitrogen | Oxidised Nitrogen Nitrite Nitrate | Chlorides as CI | Oxygen abs. from Permanganate 3 hrs at 80°F. | Turbidity in terms of Silica | Colour m.m. bro.vn, 2 ft. tube Burgess's Tintometer | Hardness (Total) | Hardness (Perm) | pH Value | Conductivity | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Orpington Well | 3 | 0.007 | 0.023 | — | 5.9 | 15.0 | 0.09 | - | 0 | 276 | 42 | 7.4 | 475 |
| North Orpington | 3 | 0.008 | 0.030 | — | 5.5 | 15.3 | 0.14 | 0.3 | 0 | 265 | 41 | 7.2 | 425 |
| Jewels Wood | 1 | 0.005 | 0.015 | — | 3.0 | 22.0 | 0.06 | — | 0 | 250 | 30 | 7.4 | — |
| Sundridge | 4 | 0.051 | 0.018 | — | 2.0 | 17.6 | 0.05 | — | 0 | 218 | 64 | 7.4 | 350 |
| Eynsford | 4 | 0.005 | 0.020 | — | 3.3 | 17.6 | 0.09 | 0.2 | 1 | 275 | 56 | 7.4 | 450 |
| Shortlands | 4 | 0.004 | 0.025 | — | 4.3 | 18.6 | 0.13 | — | 0 | 298 | 90 | 7.2 | 475 |
| Bexley | 5 | 0.006 | 0.031 | — | 5.3 | 19.3 | 0.09 | — | 2 | 291 | 69 | 7.2 | 450 |
BACTERIOLOGICAL RESULTS.
| No. of samples | Percentage of samples negative to Bact. coli in 100 ml. | Bact. coli Test Bact. coli in 100 ml. | |
|---|---|---|---|
| Orpington | 253 | 99.6 | 0.004 |
| North Orpington | 241 | 100.0 | Nil |
| Jewels Wood | 44 | 100.0 | Nil |
| Sundridge | 256 | 100.0 | Nil |
| Eynsford | 352 | 99.7 | 0.006 |
| Shortlands | 256 | 100.0 | Nil |
| Bexley | 217 | 100.0 | Nil |