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
Islington 1884
[Report of the Medical Officer of Health for Islington, Parish of St Mary]
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WATER ANALYSIS.
In the following tables I state the analyses (made monthly) of the New River Company's Water recorded by me during the year.
Analyses of Samples taken from the Works of the Company.
| 1881. | Total Solid Matter. | Chlorine. | Equal to Chloride of Sodium. | Nitrogen as Nitrates. | Nitrogen as Ammonia. | Oxygen required to oxidise Organic Matter. | Degree of Hardness. | Degree after boiling ¼ of an hour. | Organic Carbon. | Organic Nitrogen. |
|---|---|---|---|---|---|---|---|---|---|---|
| January | 22.04 | 1.224 | 2.006 | 0.333 | 0.000 | 0.015 | 15.9° | 4.2° | .. | .. |
| February | 23.12 | 1.368 | 2.242 | 0.261 | 0.000 | 0.040 | 17.0° | 4.0° | .. | .. |
| March | 20.90 | 1.368 | 2.242 | 0.229 | 0.000 | 0.028 | 16.03° | 3.5° | .. | .. |
| April | 19.66 | 1.080 | 1.77 | 0.229 | 0 .000 | 0.012 | 17.10° | 5.39° | .. | .. |
| May | 18.82 | 1.224 | 2.006 | 0.176 | 0.000 | 0.004 | 14.5° | 3.7° | .. | .. |
| June | 20.62 | 1.224 | 2.006 | 0.177 | 0.000 | 0.027 | 16.02° | 2.73° | .. | .. |
| July | 19.68 | 1.44 | 2.36 | 0.146 | 0.000 | 0.016 | 15.4° | 2.7° | .. | .. |
| August | 16.20 | 1.368 | 2.242 | 0.125 | 0.000 | 0.028 | 12.83° | 3.50° | .. | .. |
| September | 17.42 | 1.224 | 2.006 | 0.125 | 0.000 | 0.007 | 14.28° | 3.19° | .. | .. |
| October | 19.20 | 1.368 | 2.242 | 0.177 | 0.000 | 0.016 | 14.6° | 2.6° | .. | .. |
| November | 20.16 | 1.152 | 1.888 | 0.208 | 0.000 | 0.004 | 14.8° | 3.2° | .. | .. |
| December | 21.44 | 1.224 | 2.006 | 0.219 | 0.000 | 0.024 | 14.8° | 2.7° | .. | .. |
| Average | 19.95 | 1.272 | 2.084 | 0.199 | 0.000 | 0.019 | 15.2° | 3.3° | .. | .. |
Analyses of Samples taken from the Mains of the Company.
| 1884. | Total Solid Matter. | Chlorine. | Equal to Chloride of Sodium | Nitrogen as Nitrates. | Nitrogen as Ammonia. | Oxygen required to oxidise Organic Matter | Degree of Hardness. | Degree after boiling ¼ of an hour. | Organic Carbon. | Organic Nitrogen. |
|---|---|---|---|---|---|---|---|---|---|---|
| January | .. | 1.248 | 2.045 | 0.279 | 0.000 | 0.038 | 16.13° | .. | 0.044 | 0.010 |
| February | .. | 1.278 | 2.094 | 0.267 | 0.000 | 0.024 | 15.95° | .. | 0.048 | 0.017 |
| March | .. | 1.188 | 1.947 | 0 193 | 0.000 | 0.026 | 16.5° | .. | 0.051 | 0.020 |
| April | .. | 1.080 | 1.77 | 0.181 | 0.000 | 0.009 | 17.08° | .. | 0.048 | 0.016 |
| May | .. | 1.206 | 1.976 | 0.193 | 0.000 | 0.016 | 14.55° | .. | 0.038 | 0.012 |
| June | .. | 1.248 | 2.044 | 0.184 | 0.000 | 0.013 | 14.34° | .. | 0.037 | 0.011 |
| July | .. | 1.296 | 2.124 | 0.154 | 0.000 | 0.012 | 14.92° | .. | 0.039 | 0.009 |
| August | .. | 1.343 | 2.166 | 0.107 | 0.000 | 0.010 | 12.83° | .. | 0.039 | 0.016 |
| September | .. | 1.278 | 2.094 | 0.148 | 0.000 | 0.014 | 13.58° | .. | 0.056 | 0.016 |
| October | .. | 1.296 | 2.124 | 0.177 | 0.000 | 0.013 | 14.3° | .. | 0.061 | 0.016 |
| November | .. | 1.224 | 2.006 | 0.213 | 0.000 | 0.012 | 14.6° | .. | 0.066 | 0.016 |
| December | .. | 1.116 | 2.32 | 0.208 | 0.000 | 0.010 | 14.9° | .. | 0.047 | 0.015 |
| Average | .. | 1.233 | 2.059 | 0.192 | 0.000 | 0.016 | 14.97° | .. | 0.047 | 0.013 |