POLES AND PILING 



323 



of .3 in. for chestnut up to 3.1 in. for western yellow pine has been 

 secured by this method. Absorption of from 20 to 50 Ib. of creosote 

 oil per pole is usually secured. 1 



Kempfer has shown the possibilities, cost and annual saving in the 

 treatment of poles by both the brush and open-tank methods in com- 

 parison with the untreated condition of many of the kinds of timber used 

 for pole purposes. 



ESTIMATED FINANCIAL SAVING DUE TO CREOSOTE TREATMENT OF POLES 



In 1915, 2,512,780 cu. ft. of poles were treated. This is equivalent 

 to 4,282,175 lineal feet. Assuming 7 ft. to be the average length of butt 

 treatment, this means that 611,739 poles were treated during that year. 



The table on p. 324 shows the ground line and height of treatment for 

 different-sized poles used by one of the large companies operating in 

 western red cedar. 



More cubic feet of piling are now treated than of poles. It is prac- 

 tically essential to treat all piling placed in waters containing marine 

 borers as outlined above. Instead of treating only a portion of the stick, 

 as in the case of poles, the whole pile is preserved. 



1 For further information regarding this subject see '' Preservative Treatment of Poles," 

 by W. H. Kempfer, Bulletin 84, U. S. Forest Service 1911, also Proceedings, American Wood 

 Preservers' Association, Baltimore, Md. 



