In contrast to peeling the fenceposts, no difficulty was encountered in debarking 

 the poles. Apparently, the greater diameter, size, and weight of the poles or the 

 different capacity of the machine prevented stoppages in the peeling operation. In 

 general, the appearance of the peeled poles was satisfactory although the surface was 

 again slightly rougher than that of freshly peeled green poles. All of the poles had 

 surface checks of varying lengths and widths. The checks on 10 of the poles were 

 greater than 0.25 inch (0.6 cm) wide. In addition, four of the poles had wormholes 

 0.125 inch (0.3 cm) or greater in diameter. Occurrence of these defects points out 

 the need for greater care when selecting poles from dead trees. 



The results of the post-treatment evaluations are summarized in table 8. The 

 average depth of the sapwood for all poles was 1.5 inches (3.7 cm) and the range was 

 from 0.50 inch to 2.90 inches (1.3 to 7.4 cm). 



Preservative penetration was determined by using the benzedine dihydrochloride 

 stain method of AWPA Standard M-2 (1969). Specifications for poles treated by the hot 

 and cold bath method require that the preservative penetrate a minimum of 0.75 inch 

 (1.9 cm) and 85 percent of the sapwood. The average depth of preservative penetration 

 was 1.41 inches (3.6 cm) and the range was from 0.63 inch to 2.25 inches (1.6 to 5.7 

 cm). Only one of the poles had less than the minimum required penetration and, except 

 for those poles given a 4-hour cold soak, all the poles met the 85 percent penetration 

 of the sapwood requirement. 



The preservative retention was determined using the method described in AWPA 

 Standard A-5 (1969) . The preservative retention requirement of the specification 

 stipulates that a minimum of 1 lb (0.45 kg) of dry pentachlorophenol shall be in the 

 outer 0.50 inch (1.3 cm). All the study poles treated by the hot and cold bath method 

 exceeded this requirement and none of the poles treated by the cold soak method attained 

 this retention. The average retention for those poles treated by the hot and cold 

 bath method was 1,64 lb per ft^ (26.27 kg/m^) and the range was from 1.08 to 2.00 lb 

 per ft^ (17.30 to 32.04 kg/m^) . The average retention for those poles treated by the 

 soaking method was 0.36 lb per ft^ (5.77 kg/m^) and the range was from 0.16 to 0.74 lb 

 per ft^ (2.56 to 11,85 kg/m-^) . The average retention for all the study posts was 

 1.13 lb per ft^ (18,10 kg/m^) . 



A statistical analysis of the post-treatment data indicated the only significant 

 difference in the preservative retention was due to treating method (table 8). 



Table 8. --Summary of results obtained from poles cut from dead lodgepole pine trees and 

 treated with preservative by different schedules and either the hot and cold 

 bath or steeping method 



Number Average Average depth Average 



of sapwood of preservative 



Treating schedule poles depth penetration retention 



Inches cm Inches cm Lb/ ft^ kg/m^ 



hour hot and 12-hour 

 cold bath 



6 



1 



46 



3 



71 



1 



48 



3 



76 



1 



77 



28 



36 



hour hot and 6-hour 

 cold bath 



6 



1 



53 



3 



89 



1 



69 



4 



29 



1 



54 



24 



67 



hour hot and 6-hour 

 cold bath 



6 



1 



39 



3 



53 



1 



38 



3 



51 



1 



61 



25 



79 



hour cold soak 



4 



1 



36 



3 



45 



1 



31 



3 



33 





36 



5 



77 



hour cold soak 



4 



1 



14 



2 



90 



1 



16 



2 



95 





32 



5 



13 



hour cold soak 



4 



1 



96 



4 



98 



1 



25 



3 



18 





39 



6 



25 



Average 





1 



47 



3 



73 



1 



41 



3 



58 



1 



13 



18 



10 



11 



