Sewer ventilation and sewage treatment / [R. Harris Reeves].

  • Reeves, R. Harris.
Date:
1889
Catalogue details

Licence: Public Domain Mark

Credit: Sewer ventilation and sewage treatment / [R. Harris Reeves]. Source: Wellcome Collection.

    18/90 page 14
    each sewer ; but this only changes the air near the ventilating shafts. The bulk of air between the shafts is not affected, and we only get a fresh supply into the sewers when they fill through an excessive rainfall. The temperature and weight shown by the cubes, both on the surface and in the sewers, was that of August the 9th, 1889. The highest on the surface was 73 degrees = 523*18 grains per cubic foot in weight, and the lowest 57° = 539*40 grains per cubic foot. Now the temperature of air in the sewers being 52° = 544*67 grains per cubic foot, there was an average, during the twenty-four hours, of 13*65 grains less pressure per cubic foot in the whole of the atmosphere on the surface, as compared with that of the sewer. When the sewers, filled by the rainfall, as shown by the top section, Plate 1, a volume of sewer gas ten feet in width, as shown, was driven out to mix with the atmosphere. By a careful examination of the chart* Plate 2, which shows the weight of air per cubic foot on the surface as compared to that of the sewers, the rainfall, and a weekly average of the tempera- ture (taken in the shade); we can form an accurate idea of the quantity of fresh air that we get in sewers, during each month of the year. Although it is generally known that wind * These readings of the thermometer and rainfall were kindly supplied me by Mr. J H. Steward, 406, Strand, London.
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