COAL-TAR AND WATEE-GAS TAR CREOSOTES. 



65 



10.48 pounds and 18.79 pounds, respectively. The value of K in 



3.3 

 these experiments was t?^- The equations for the two curves are 



3.74(1- D^-F^ ^ J 11.68(1- F)^-y2 



- = A , and tt. — =fy = A , 



92- Y 



49- y 



respectively. The curves and data are plotted independently. 



It would appear, however, notwithstanding the great loss which 

 must certainly have occurred, that the effect of this loss upon the 



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o 



X 































/ 















- 



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^ 



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/a 





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,30 -^O .X> 



Fig. 33.— The relation between the volatility and loss by evapoartion 

 of creosotes from treated wood with time. 



life of the treated timber may have been given more weight than it 

 really deserved, particularly as to its effect upon the prevention of 

 decay. Bateman {27) has shown that in all service records of ties 

 and telephone poles, many of which were treated with very light 

 creosote, the failures are due to mechanical failure of the wood itself 

 and not to the failure of the creosote to protect. Tables 24 and 25 

 show the service records from which these conclusions are drawn and 

 the analyses of the oils used. 

 75536°— 22 5 



