Recent results obtained from the preservative treatment of telephone poles

The results of an experience with treated poles over a period of 18 years have been analyzed. Data are given for poles treated by pressure, open tank, and brush methods. The relation of these methods of treatment to the conditions which have determined the choice of pole timbers in the United States is outlined. The experience with brush treatments has reached a more advanced stage than that with the other types of treatment and is consequently discussed in greater detail. Rates of decay, increase in life by treatment, the effect of seasoning, and the characteristics of the damage to poles caused by decay and by insects are all covered.