Hints from the Health Department. Leaflet from the archive of the Society of Medical Officers of Health. Credit: Wellcome Collection, London
[Report of the Medical Officer of Health for Waltham Forest]
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Milligrammes per litre (unless otherwise stated)
Description of the Sample | Number of Samples Day of the month | Ammoniacal Nitrogen | Albuminoid Nitrogen | Nitrate Nitrogen | Oxygen abs. from KMn04 4 hrs. at 27°. C. | B.O.D. 5 days at 20°. C. | Hardness (total) CaC03 | Hardness (non-carbonate) CaC03 | Magnesium as Mg | Sodium as Na | Potassium as K | Chloride as CL | Phosphate as P04 | Silicate as Si02 | Sulphate as S04 | Natural Fluoride as F | Surface-active material as Manoxol OT | Turbidity units | Colour (Burgess units) | pH value | Electrical Conductivity (micromhos) | |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
(i) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) | do | (12) | (13) | (14) | (15) | (16) | (17) | (18) | (19) | (20) | (21) | (22) | (23) |
Thames-derived | 363 | 0.026 | 0.083 | 4.8 | 1.02 | 274 | 79 | 5 | 27.7 | 5.6 | 40 | 2.7 | 9 | 70 | 0.20 | 0.03 | 0.1 | 1 1 | 7.9 | 570 | ||
Lea Bridge | 52 | 0.022 | 0.096 | 5.3 | I.I 1 | 304 | 98 | 7 | 35.4 | 6.6 | 48 | 3.5 | 10 | 92 | 0.25 | 0.03 | 0.2 | 13 | 7.9 | 640 | ||
Chingford Mill | 4 | 0.190 | 0.019 | 0.9 | 0.30 | 285 | 71 | 27 | 0.50 | 0.1 | 6 | 7.4 | 530 | |||||||||
Coppermills | 52 | 0.012 | 0.105 | 5.6 | 1.14 | 306 | 109 | 7 | 35.4 | 6.6 | 50 | 3.5 | 9 | 92 | 0.25 | 0.03 | 0.1 | 10 | 7.9 | 640 |