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 1948
[Report of the Medical Officer of Health for Chislehurst]
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APPENDIX 5.
Average Results of the Chemical and Bacteriological Examination of the Water Supply to Chislehurst and Sidcup U.D. January-December, 1948. Parts per million (unless otherwise stated.)
(a) Oxygen abs. from Permanganate at 80° F.
(b) Colour m.m. brown 2 ft. tube. Burgess's Tintometer.
| Description of the Sample | . No. of Samples | Ammoni acal Nitrogen | Albuminoid Nitrogen | Oxidised Nitrogen | Chlorides as CI. _ | (a) | Turbidity. in terms of Silica | (b) | Hardness (Total) | Hardness (Perm) | pH Value | Conductivity |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Orpington Well | 3 | 0.010 | 0.017 | 5.2 | 16.0 | 0.16 | 0 | 324 | 81 | 7.1 | 475 | |
| North Orpington | 4 | 0.001 | 0.019 | 4.2 | 14.5 | 0.12 | — | 3 | 299 | 100 | 7.1 | 450 |
| Shortlands Well | 3 | 0.000 | 0.024 | 4 5 | 19.0 | 0.15 | — | 0 | 315 | 129 | 7.2 | 475 |
| Eynesford Well | 3 | 0.010 | 0.019 | 3.1 | 160 | 0.13 | — | 0 | 313 | 78 | 7.2 | 450 |
| Bexley Well | 3 | 0.003 | 0 015 | 4.2 | 16 7 | 0.14 | — | 0 | 310 | 80 | 7.1 | 475 |
| Wilmington Well | 8 | 0.007 | 0.018 | 6.0 | 204 | 0.14 | — | 0 | 312 | 79 | 7.1 | 475 |
| Darenth Well | 5 | 0. 001 | 0.012 | 3.5 | 16.4 | 0.15 | — | 0 | 301 | 96 | 7 1 | 450 |
| Thames-derived | 1930 | 0.083 | 0.086 | 3.7 | 27.9 | 1.00 | 0.3 | 16 | 242 | 71 | 7.7 | 450 |
| filtered water |
BACTERIOLOGICAL RESULTS.
| Description of the Sample | No. of Samples | Percentage of Samples negative 100 ml. | Bact. coli. per 100 ml |
|---|---|---|---|
| Orpington Well | 255 | 100.0 | NIL |
| North Orpington | 255 | 100.0 | NIL |
| Shortlands | 255 | 100.0 | NIL |
| Bexley Well | 377 | 100.0 | NIL |
| Wilmington Well | 253 | 100.0 | NIL |
| Wilmington Well | 404 | 100.0 | NIL |
| Darenth Well | 257 | 100.0 | NIL |
| Thames-derived filtered water | 3827 | 99.7 | 0.006 |