A Record of the Work of the Leeds Smoke Abatement Society
Journal of the Royal Sanitary Institute
fllHE Society was formed in 1890, (1) To determine the nature and T extent of atmospheric impurities arising from coal smoke, (2) To consider the question of coal consumption in boilers, furnaces, and duemestic fire-places, (3) To examine the efficiency of the present system for controlling the emission of smoke. A calculation of the amount of soot in the air of Leeds, as half per cent. on all the coal burnt, gives much too low a figure for domestic coal, whicll yielded by experiment an average
... of 5 per cent. of soot with the better qualities of coal. But at half per cent., the claily consumption of -t,U111.) tons in Leeds means twenty tons of soot, and a similar figure was obtained by aspirating large quantities of air through a weighed plug of cotton wool. Alost of the soot is blown away, but we find that about half a ton falls in Leeds each day. Tllis figure was obtained in January, ]',il,12, when a square yard of snow was removed daily from the parish churchyard, the snow melted, and the soot estimated. Most of the daily sootfall is washcd away in time, but as it contains about 15 per cent. of a sticky oil by means of which it adheres and quickly discolours brick anll stone work, not to speak of fabrics, furniture and clothes, at least 25 lbs. per day stichs and is not removed by rain. This was determined by means of glass plates exposed at some distance from chimneys, and examined every few weeks. Those exposed at about nine miles from Leeds remained almost clean. In addition to the sulphurous acid and soot, the loss of light was also estimated daily at different stations in 1895-96, and showed a considerable difference in the town. These examinations convinced us of the substantial nature of the nuisance.