Treatment of ll'estern Yellow Pine 



107 



In the tables throughout this paper the absorption is given in 

 pounds per cubic foot of the treated section of the pole. The 

 lower seven feet of the poles contain, on an average, 6.25 cubic 

 feet. The penetration is given in inches at a point about 5 l /z 

 feet from the butt of the pole. 



The following points were brought out : 



1. The time of cutting the poles shows a marked influence 

 on absorption not only in this case but with other preservatives. 

 Summer-cut poles are difficult to treat while the Autumn-cut 

 takes the preservative most readily. 



2. Good absorption can be secured without heating the 

 oil to temperatures resulting in evaporation of the creosote. 130 

 F. was used as a maximum temperature with good results in 

 test runs. 



3. An average absorption of 13 pounds per cubic foot and 

 a penetration of 3 inches was secured by this treatment. 



These poles have a heavy treatment. The wood cells are 

 full of free oil and as the poles were removed from the cold 

 oil they carried large amounts of it on their surface, much of 

 which is wasted. 



In an effort to overcome these disadvantages the next se- 

 ries of treatments were given as the preceding series except that 

 the oil was again heated to about 200 F. several hours before 

 the poles were removed. The object of reheating is to expand 

 the air again in the wood and force the excess oil from the outer 

 cells. 



The results are presented in Table 6. 



TABLE 6. POLE TREATMENTS WESTERN YELLOW PINE. 

 Creosote Open Tank Re-heated. 



It is apparent that with the exception of the Summer-cut 

 poles, each cut has taken up less oil per cubic foot. The average 

 penetration is better than in the series in which the poles were 

 not reheated. The average absorption of 8.9 pounds of oil per 

 cubic foot with a penetration of 3.3 inches at the ground line is 

 a satisfactory amount of oil for the result secure:!. Further. 



