Hints from the Health Department. Leaflet from the archive of the Society of Medical Officers of Health. Credit: Wellcome Collection, London
Forty-ninth annual report on the health and sanitary condition of the Borough of Islington
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278
[1904
Table V.
1904. | 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 boiling¼ of an hour. | Organic Carbon. | Organic Nitrogen. |
---|---|---|---|---|---|---|---|---|---|---|
January | 26.00 | 1.296 | 2.124 | 0.323 | 0.000 | 0.026 | 18.22 | 4.59 | .. | .. |
February | 24.00 | 1.296 | 2.124 | 0.229 | ,, | 0.064 | 16.52 | 4.80 | .. | .. |
March | 23.90 | 1.296 | 2.124 | 0.261 | ,, | 0.016 | 17.37 | 3.99 | .. | .. |
April | 21.00 | 1.296 | 2.124 | 0.219 | ,, | 0.012 | 15.47 | 3.19 | .. | .. |
May | 20.60 | 1.368 | 2.242 | 0.208 | ,, | 0.008 | 15.89 | 3.59 | .. | .. |
June | 19.40 | 1.368 | 2.242 | 0.156 | ,, | 0.016 | 14.84 | 3.40 | .. | .. |
July | 22.00 | 1.440 | 2.360 | 0.198 | ,, | 0.015 | 14.63 | 3.00 | .. | .. |
August | 21.50 | 1.368 | 2.242 | 0.167 | ,, | 0.022 | 14.84 | 3.00 | .. | .. |
September | 22.00 | 1.296 | 2.124 | 0.208 | ,, | 0.012 | 16.10 | 3.10 | .. | .. |
October | 22.90 | 1.296 | 2.124 | 0.229 | ,, | 0.008 | 15.89 | 3.19 | .. | .. |
November | 21.20 | 1.368 | 2.242 | 0.208 | ,, | 0.003 | 15.89 | 3.19 | .. | .. |
December | 23.50 | 1.368 | 2.242 | 0.219 | ,, | 0.003 | 16.73 | 4.10 | .. | .. |
Average | 22.33 | 1.338 | 2.193 | 0.219 | 0.000 | 0.017 | 16.03 | 3.59 | .. | .. |
Analyses of Samples taken from the Mains of the Company.
1904. | 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 | .. | 1.332 | 2.183 | 0.286 | 0.000 | 1.00l8 | 17.79 | .. | 0.092 | 0.012 |
February | .. | 1.350 | 2.212 | 0.247 | ,, | 0.044 | 17.37 | .. | 0.135 | 0.017 |
March | .. | 1.368 | 2.242 | 0.271 | ,, | 0.027 | 17.72 | .. | 0.087 | 0.010 |
April | .. | 1.320 | 2.163 | 0.226 | ,, | 0.013 | 15.75 | .. | 0.060 | 0.008 |
May | .. | 1.350 | 2.212 | 0.216 | ,, | 0.010 | 15.57 | .. | 0.059 | 0.007 |
June | .. | 1.404 | 2.301 | 0.169 | ,, | 0.016 | 15.52 | .. | 0.051 | 0.006 |
July | .. | 1.464 | 2.399 | 0.194 | ,, | 0.012 | 14.49 | .. | 0.032 | 0.006 |
August | .. | 1.350 | 2.212 | 0.195 | ,, | 0.016 | 15.15 | .. | 0.055 | 0.006 |
September | .. | 1.350 | 2.212 | 0.200 | ,, | 0.008 | 15.21 | .. | 0.037 | 0.005 |
October | .. | 1.350 | 2.212 | 0.221 | ,, | 0.010 | 15.68 | .. | 0.032 | 0.005 |
November | .. | 1.368 | 2.242 | 0.212 | ,, | 0.006 | 16.52 | .. | 0.026 | 0.004 |
December | .. | 1.386 | 2.271 | 0.237 | ,, | 0.009 | 17.15 | .. | 0.049 | 0.005 |
Average | .. | 1.366 | 2.238 | 0.222 | 0.000 | 0.016 | 16.16 | .. | 0.059 | 0.008 |
T