Elements of forestry (1914) Elements of forestry elementsoffores00moon Year: 1914 240 ELEMENTS OF FORESTRY Posts. Species. Longleaf pine Douglas fir. . Red oak Tamarack. . . Untreated life in years. Treated life in years. 20 20 20 20 20 Increased life as result of treatment. 12 13 15 10 But perhaps the greatest economy can be effected with the use of such perishable and cheap post material as cottonwood, elm, maple, birch, beech, willow and poplar which can be made to last from fifteen to eighteen years instead of from three to five years. Poles. Species. Chestnut Lodgepole pine
Elements of forestry (1914) Elements of forestry elementsoffores00moon Year: 1914 240 ELEMENTS OF FORESTRY Posts. Species. Longleaf pine Douglas fir. . Red oak Tamarack. . . Untreated life in years. Treated life in years. 20 20 20 20 20 Increased life as result of treatment. 12 13 15 10 But perhaps the greatest economy can be effected with the use of such perishable and cheap post material as cottonwood, elm, maple, birch, beech, willow and poplar which can be made to last from fifteen to eighteen years instead of from three to five years. Poles. Species. Chestnut Lodgepole pine Western pine. . White oak Douglas fir. . . . Untreated life Treated life in in years. years. Increased life as result of treatment. IO-I2 15 19 12 12 Brush Treatment. — The brush treatment is a very cheap, but less efficient method of prolonging the life of certain timbers, especially those exposed to the weather or even in the case of poles and posts when the open tank treatment cannot be used. There are several patent preservatives on the market which are very good. Any of these, or creosote applied hot and with at least two coats, often give fairly satisfactory results. The ordinary paint brush is used to apply the preservative. Al- though only a superficial treatment, the object should be to thoroughly fill and cover with the fluid all cracks, checks, knot holes or similar defects which offer the best opening for
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