Treatment of ll'cstcni Yclloiv Pine 



109 



ment which coats the interior of the walls and leaves no excess 

 oil in the wood. 



6. The above treatment can be given with six pounds of 

 oil per cubic foot or with 4^ gallons to the average 40 foot 8 

 inch pole. 



7. The quantity of oil used can be controlled. 



8. The time of treatment will vary according to the moist- 

 ure condition of the timber as affected by relative humidity and 

 recent rains. 



9. Seasoned timber can be very successfully treated with 

 creosote in from one to five hours according to its moisture con- 

 dition. 



10. Green and half seasoned poles cannot be creosoted 

 successfully in an open tank. 



11. Poles not well seasoned should be treated by heating 

 for several hours at 215 F. and plunging into cold oil until the 

 poles are cold. This is a forceful treatment and the result will 

 depend upon the moisture condition of the poles. 



12. The treatment is best applied to seasoned poles as 

 follows : 



A. By heating the poles for one hour at 180, cooling 

 the oil to 160, reheating to 200 and withdrawing the poles 

 hot. 



B. By heating the poles for one hour at 180, plunging 

 them in cold oil for five minutes and removing. 



C. By heating as above and boiling in cold oil until 

 desired absorption is secured and then removing. 



Similar experiments with zinc chloride in solution and with 

 crude petroleum are included in the summary in the following 

 table : 



TABLE 7. 



