THE PRESERVATIVE TREATMENT 



Tar, Crude Oil and Wood Creosote have been used but 

 the first two are not recognized as wood preservatives, and 

 good results can not be expected from their use. They are 

 not sufficiently poisonous to the organisms which cause de- 

 cay; the tar does not penetrate the wood appreciably; the 



FIG. 1. AN EASILY BUILT HOME MADE OUTFIT. This outfit is in- 

 expensive, consisting of 2 tight wooden barrels, l l / 2 . ft. of 3-inch pipe, 4 3-inch lock 

 nuts, and 4 3-inch rubber gaskets. Its capacity is 20 posts per day, open tank treat- 

 ment. With 2 more barrels for treating with cold creosote, the capacity could be 

 doubled. 



FIG. 2. A TWENTY-POST CAPACITY TANK. This tank is galvanized 

 iron, 24 gauge, and fitted with pipes as shown should cost about $8. Its daily ca- 

 pacity, 20 4J^-inch posts, butt treatment, could be doubled by providing a second tank. 



Courtesy of Iowa Agricultural Experiment Station. 



crude oil has no value unless the wood is kept saturated and 

 waterproofed with it. Their use is not recommended, at 

 least by the methods of treatment which can conveniently 

 be carried out on the farm. Wood creosote has qualities 



