. Canadian forest industries 1892-1893. Lumbering; Forests and forestry; Forest products; Wood-pulp industry; Wood-using industries. 4 THE LUMBERS A. 1ST July, 1893 CHIMNEYS AND DRAFT. T N this age of science and practical development, the form, size and proportion of furnaces and chimneys, to be the best for steam users, take a prominent place, says Noah J. Tilghman, in Power. All desire the great- est amount of steam from the ton of coal or cord of wood as the case may be. I here propose to deal with practical results, regard- less of theory, but whereever practice and theory go together, th
. Canadian forest industries 1892-1893. Lumbering; Forests and forestry; Forest products; Wood-pulp industry; Wood-using industries. 4 THE LUMBERS A. 1ST July, 1893 CHIMNEYS AND DRAFT. T N this age of science and practical development, the form, size and proportion of furnaces and chimneys, to be the best for steam users, take a prominent place, says Noah J. Tilghman, in Power. All desire the great- est amount of steam from the ton of coal or cord of wood as the case may be. I here propose to deal with practical results, regard- less of theory, but whereever practice and theory go together, they shall be accepted. I think best to state my experience first as the shortest way to the facts. Although a mechanic and somewhat acquainted with water power and machinery before, I had my first exper- ience with steam engines and the setting of steam boil- ers in 1S54, when my partners and I bought an engine, two boilers and other machinery. We asked the build- ers to give us a draft for the setting of the boilers, the shape and style of furnace and chimney, size and pro- portions, and also to send us a competent man to super- intend the work. When all was ready we went to work, but in a short time steam faded to keep up as at first. We cooled down to find the trouble, and found the boilers covered with a scale of soot. We cleaned it off, and went on as at first, but soon had to clean again. On examination we found that the part of the boiler plate just over the bridge brick walls was clear of soot, while between the bridge walls the boilers had the scale of soot. We had been instructed that these several walls (Fig. t) were to form smoke chambers, and as the unconsumed gases or smoke would roll over the walls into the spaces, it would ignite again and make extra heat. Then a consultation was held. I proposed filling the smoke chambers with brick work up to the top of the walls. This was objected to, upon the ground that the builders ought to know the way to do it. Then I agr
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