. Elements of forestry. Forests and forestry. WOOD UTILIZATION 205 In the South the industry is confined to the yellow pines, the principal products being turpentine, tar and creosote. Over 190,000 cords of softwoods are used annually and the industry is on the rapid increase especially in the South and in the Douglas fir region of the Fig. 39. — Retorts Used in the Wood Distillation Industry. The wood is placed in these air-tight ovens which are heated to high tempera- tures. The gases that pass off are collected and used as the basis of several wood chemicals. The residue, charco
. Elements of forestry. Forests and forestry. WOOD UTILIZATION 205 In the South the industry is confined to the yellow pines, the principal products being turpentine, tar and creosote. Over 190,000 cords of softwoods are used annually and the industry is on the rapid increase especially in the South and in the Douglas fir region of the Fig. 39. — Retorts Used in the Wood Distillation Industry. The wood is placed in these air-tight ovens which are heated to high tempera- tures. The gases that pass off are collected and used as the basis of several wood chemicals. The residue, charcoal, was formerly made in the wasteful open air pits. Large quantities of limb wood, stumps and mill waste, in- cluding sawdust, slabs and defective material, are now being used in this industry so it is playing an important part in the closer and more effective utilization of the raw products of the forest. The process consists largely of the dry distillation of wood,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Moon, Frederick Franklin, 1880-1929; Brown, Nelson Courtlandt, 1885-. New York J. Wiley
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