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 London County Council]
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Splashing Experiments.
Table II.
Number of Experiment | Date of Experiment. | Direction and Force of Wind. | Barometrical pressure. | Temperature (shade). | Temperature of Sewer Air. | Current of Air in Sewer. | Quantity of Sewage. | Vols. of CO2 in per 10.000 Fresh Air.. | Vols. of CO2 in per 10.000 Fresh Air | Time Experiment began. | Time Experiment finished. | Organisms in 10 litres of normal sewer air. | Organisms in 10 litres of Sewer Air during splashing. | Organisms in 10 litres of Sewer Air during splashing. | Total. | Remarks. | |||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Moulds. | Bacteria | Total. | Moulds. | Bacteria. | Total. | Moulds. | Bacteria. | ||||||||||||||
1 | 1891. Nov. 20th | s.w. Fair breeze | 29.90 | – | 55 | 2 ft. per second against How | Less than normal | – | 13.86 12.34 | 12.30 p.m. | 3.20 p.m. | 17 | 5 | 22 | 20 0 8 | 7 | 12 65 4 | 86 | Moderately fine day; sewer walls very wet. | ||
2 | Nov. 25th | S.E. Moderate | 29.78 | – | 55 | 3 ft. per second against flow | Normal | – | 13.17 13.17 | 2.45 p.m. | 4.45 p.m. | 0 | 18 | 18 | 0 4 | 27 | 33 | 0 8 | 7 | Fine day; no sewage had been flowing for two days owing to repairs. | |
3 | Dec. 2nd | S.W. Moderate | 29.48 | – | 56.5 | Slight to 3 ft. per second against flow | Rather more than normal | – | 11.79 | 2.40 p.m. | 5.0 p.m. | 40 | 6 | 40 | 47 | 3 | 50 | 5 | 4 | 9 | Fine day; sewage had been diverted for some days, owing to repairs; sewer walls very damp. |