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 Islington, Parish of St Mary]
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WATER ANALYSIS.
In the following tables I have stated the analyses made monthly of the New River Company's water, and recorded by me during the year.
Analyses of Samples taken from the Mains of the Company.
1880. | Total Solid Matter per Gallon. | Chloride of Sodium. | Nitrogen as Nitrates. | Nitrogen as Ammonia. | Oxygen required by Oxidisable Matter. | Degree of Hard. ne88. | Degree of Hardness after boiling quarter of an hour. |
---|---|---|---|---|---|---|---|
January | 23.0 | 1.652 | 0.195 | 0.000 | 0.034 | 16.0° | 3.3° |
February | 21.83 | 1.652 | 0.210 | 0.000 | 0.0082 | 15.4° | 3.7° |
March | 21.03 | 1.652 | 0.165 | 0.000 | 0.040 | 16.0° | 3.3° |
April | 19.16 | 1.534 | 0.151 | 0.000 | 0.021 | 13.8° | 3.8° |
May | 18.01 | 1.416 | 0.144 | 0.000 | 0.007 | 14.6° | 3.0° |
June | 20.18 | 1.534 | 0.142 1 | 0.000 | 0.012 | 14.5° | 2.8° |
July | 19.22 | 1.652 | 0.137 | 0.000 | 0.004 | 15.0° | 2.8° |
August | 19.73 | 1.652 | 0.142 | 0.000 | 0.???80 | 14.8° | 2.8° |
September | 19.43 | 1.77 | 0.126 | 0.000 | 0.014 | 15.0° | 3.0° |
October | 21.74 | 1.888 | 0.135 | 0.000 | 0.048 | 15.4° | 2.4° |
November | 22.58 | 1.77 | 0.188 | 0.000 | 0.040 | 15.4° | 2.4° |
December | 23.35 | 1.652 | 0.188 | 0.000 | 0.040 | 17.6° | 2.4° |
Average | 20.77 | 1.654 | 0.160 | 0.000 | 0.???29 | 16.3° | 3.0° |
Analyses of Samples taken from the Cab-rank at Islington Green. | |||||||
1880. | Total Solid Matter per Gallon. | Chloride of Sodium. | Nitrogen as Nitrates. | Nitrogen as Ammonia. | Oxygen required by Oxidisable Matter. | Degree of Hardness. | Degree of Hardness after boiling quarter of an hour. |
January | 22.85 | 1.711 | 0.185 | 0.000 | 0.024 | 16.0° | 3.2° |
February | 22.14 | 1.652 | 0195 | 0.000 | 0.041 | 15.4° | 3.5° |
March | 22.03 | 1.534 | 0.150 | 0.000 | 0.040 | 16.0° | 3.3° |
April | 19.59 | 1.534 | 0.151 | 0.000 | 0.016 | 13.8° | 3.3° |
May | 17.72 | 1.416 | 0.137 | 0.000 | 0.016 | 14.6° | 3.0° |
June | 20.18 | 1.534 | 0.142 | 0.000 | 0.012 | 14.3° | 3.0° |
July | 19.08 | 1.652 | 0.137 | 0.000 | 0.020 | 14.8° | 3.8° |
August | 20.14 | 1.652 | 0.142 | 0.000 | 0.028 | 14.8° | 2.4° |
September | 20.78 | 1.77 | 9.135 | 0.000 | 0.056 | 15.4° | 3.0° |
October | 21.39 | 1.652 | 0.135 | 0.000 | 0.028 | 15.4° | 2.4° |
November | 22.91 | 1.652 | 0.198 | 0.000 | 0.004 | 15.4° | 2.4° |
December | 23.21 | 1.652 | 0.188 | 0.000 | 0.052 | 17.6° | 3.3° |
Average | 21.00 | 1.617 | 0.158 | 0.000 | 0.025 | 16.3° | 3.0° |