COAL-TAR AND WATER-GAS TAR CREOSOTES.' 
65 
10.48 pounds and 18.79 pounds, respectively. The value of K in 
The equations for the two curves are 
these experiments was y nf 
3.74(1- YY-Y 2 
92- Y 
= X, and- 4Q _y =X } 
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 
TO 
\ 
X 
\*0 
\ 
i it00 ** 
N 
> 
o 

y 
/ 
/o 
/ 
I 
£^* 
r 
&> to <S0 
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 
