ABSORPTION AND PENETRATION OF COAL TAR AND CREOSOTE. 13 



increased, the conditions of treatment being constant. Experiments 

 were made to determine the effect on the absorptions and penetra- 

 tions of tar and creosote mixtures of an increase in the time of treat- 

 ment, the intensity of the pressure, or the temperature of the pre- 



PENETRANCE TESTS. 

 (Data in Table 14.) 



'tJ 



















l — 





























3 



































i 













































\ 























































































































.4 



























































































5 















il 





















































































































































































































































































































































1P4 

 .24 



1.06 



1.08 



1.10 



i.12 



v> 



a 

 s 



3 



£ .20 



o .16 



| 

 8 '»2 



a 

 < 



.08 

 id 

 a 



bi .04 







LQ4 i.06 1.08 1.10 1.12 



SPECIFIC GRAVITY AT 140 F. (60 CJ 



Eig. C— The relative absorptions and penetrations into Iongleaf pine of various commercial creosotes. 



lip; 



ii sZs 



Toint 



Creosote 



No. 



No. 



1 



1 



2 



2 



3 



3 



4 



4 



5 



5 



Kind of creosote. 



Creosote containing tar (estimated at about 10 per cent). 



Creosote. 



Pure coal-tar creosote. 



Creosote containing tar (estimated at less than 5 per cent). 



High-boiling creosote. 



Time of treatment, 2 hours; pressure, 75 pounds per square inch; temperature, 160° F. 



