The Seasoning and preservative treatment of arborvitæ poles . y from 8 to 10 cents per gallon, the expenseis greatly reduced. Assuming the same value for labor, as before, a similar weight pergallon for creosote as for carbolineum, and a similar condition of thepoles as in the carbolineum treatments, we get the following figures: Firstcoat. Secondcoat. Labor $ $0. 036 Creosote ( lbs.) at 8 cents per gallon .071 .050 Both coats .121 a pounds.[Cir. 136] 20 It is probable that if the work is clone during the summer theabsorption of oil will be heavier, with a consequent in
The Seasoning and preservative treatment of arborvitæ poles . y from 8 to 10 cents per gallon, the expenseis greatly reduced. Assuming the same value for labor, as before, a similar weight pergallon for creosote as for carbolineum, and a similar condition of thepoles as in the carbolineum treatments, we get the following figures: Firstcoat. Secondcoat. Labor $ $0. 036 Creosote ( lbs.) at 8 cents per gallon .071 .050 Both coats .121 a pounds.[Cir. 136] 20 It is probable that if the work is clone during the summer theabsorption of oil will be heavier, with a consequent increase in cost. Assuming the life of an untreated pole to be 12 years, its cost$9 set in the line, the rate of interest on the investment 6 per cent,the cost of the carbolineum brush treatment 45 cents, and of a creosotebrush treatment 16 cents (estimated cost for summer treatments), itis found that the carbolineum brush treatments would have to addabout one year to the life of the pole, and creosote but one-third of ayear, to pay for the cost of treatment/. Fig. 6.—Open tank for treating telephone poles. The chief advantages of brush treatments lie in the economy offirst cost and the simplicity of operation. In the case of greentimber, experiments have proved that brush treatments with ordinarypreservatives are a failure. Whether such treatments will stand thetest of relative economy when applied to seasoned timber remains tobe determined by actual trial. In view of the fact that arborvitse is an exceptionally valuablepole timber, and that prices will probably continue to rise as rapidlyor even more rapidly than they have in the past few years, it isimportant that the most thorough method of preservation should beadopted, provided that the cost of treatment does not exceed thegain from the increased life of the pole. « To secure the basis for this comparison of the annual charges of brush-treated and untreated poles, the foliowing formula was used: r=R ? l—4> m which^
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