ABSORPTION AND PENETRATION OF COAL TAR AND CREOSOTE. 19 



PENETBANCE TESTS. 

 (Data in Table 20.) 



o 4 

 O 



*»..___ 



2 -*=■ 



0* — 



130 140 150 160 170 160 190 200 210 220 



6 



o 



i 



K 



|S 



at b 



S3 



*3 





































































































































































< 



» 







































< 



► 























4 



>-*■" 













































































































































































































130 140 150 160 170 180 190 200 210 220 



150 160 170 180 190 200 210 223 

 TEMPERATURE- DEGREES FAR. 



Pig. 11. — The relative absorptions and penetrations into longleaf pine of a mixture of equal parts of creosote 

 No. 4 and a normal by-product coke-oven tar No. 1 at different temperatures (normal amount of free 

 carbon in tar, 6 per cent, by weight). Time of treatment, 2 hours; pressure, 75 pounds per square inch. 



