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
Wembley 1937
[Report of the Medical Officer of Health for Wembley]
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CHEMICAL & BACTERIOLOGICAL WATER REPORTS.
| Chemical. | Sample of Water Colne Valley Water Co. 25/5/37. | Sample of Water Rickmansworth & Uxbridge Water Co. 31/8/37. | ||
|---|---|---|---|---|
| Parts per 100,000 | Grains per Gallon | Parts per 100,000 | Grains per Gallon | |
| Total solids (dried at 120° C) | 30.0 | 21.0 | 44.5 | 31.2 |
| Combined chlorine (as CI.) | 4.20 | 2.94 | 1.70 | 1.19 |
| equivalent to Sodium Chloride (NaCl) | 6.93 | 4.85 | 2.81 | 1.97 |
| Nitric nitrogen (nitrates) | 0.52 | 0.36 | 0.62 | 0.43 |
| Nitrous nitrogen (nitrites) | Nil | Nil | Nil | Nil |
| Ammoniacal nitrogen | Nil | Nil | 0.0008 | 0.0006 |
| Albuminoid nitrogen | 0.0030 | 0.0021 | 0.0012 | 0.0008 |
| Oxygen absorbed in 4 hours at 27 ° C | 0.035 | 0.025 | 0.010 | 0.007 |
| Lead or Copper | Nil | Nil | Nil | Nil |
| Temporary hardness (equivalent to CaCo3) | 12.0 | 8.4 | 26.5 | 18.5 |
| Permanent hardness ( „ „ „ ) | 2.0 | 1.4 | 5.8 | 4.1 |
| Total Hardness ( „ „ „ ) | 14.0 | 9.8 | 32.3 | 22.6 |
| Average number of organisms producing visible colonies on gelatine plates, incubated at 20° C. for 3 days is found to be | 16 per c.c. | 22 per c.c. | ||
| Average number of organisms producing visible colonies on agar plates, incubated at 37.5° C. for 2 days is found to be | 3 per c.c. | less than 1 per c.c. | ||
| B. Coli | Not found in 100 c.c. | Not found in 100 c.c. | ||
| Streptococci | Not found in 30 c.c. | Not found in 30 c.c. | ||
| CI. Welchii (spores) | Not found in 100 c.c. | Not found in 100 c.c. | ||