ABSORPTION AND PENETRATION OP COAL TAR AND CREOSOTE. 



33 



Table 9. — Data upon the relative absorptions and penetrations into longleaf pine of 

 mixtures of equal parts of creosote No. 4 and by-product coke-oven tar No. 2 containing 

 different amounts of free carbon {normal amount of free carbon in tar, 16 per cent, by 

 weight). 





Aver- 

 age 



num- 

 ber 

 annual 



rings 

 per 



inch. 



Character of preservative. 



AVeight 

 of speci- 

 men 

 direct- 

 ly be- 

 fore 

 treat- 

 ment. 





Aver- 

 age 



longi- 

 tudinal 



pene- 

 tration. 



Specimen No. 



Tar 

 No. 2. 



Creo- 

 sote 

 No. 4. 



Free 

 carbon 

 in mix- 

 ture. 



Specific 

 gravity 



at 

 140° F. 

 (60°C.) 



Viscos- 

 ity at 

 160° F. 

 (Engler 

 viscosi- 

 meter). 



Pre- 

 serva- 

 tive 

 ab- 

 sorbed. 



F-4 



16.5 

 15.0 



P. ct. 



by vol- 

 ume. 

 50 

 50 



P. ct. 

 by vol- 

 ume. 

 50 

 50 



P.ct.by 

 weight. 

 Trace. 

 Trace. 



1.132 

 1.132 



1.7 

 1.7 



Lbs. 



4.021 

 4.115 



Lbs. 



0.071 



.025 



Ins. 



2.61 



G-5 



1.39 









15.8 















.048 



2.00 



















F-l 



17.0 

 16. 



50 

 50 



50 

 50 



3 

 3 



1.140 

 1.140 



1.9 

 1.9 



4.178 

 4.376 



.064 

 .016 



2.82 



G-2 



1.10 









16.5 















.040 



1.96 



















F-3 



16.0 50 



50 

 50 



5 

 5 



1.147 

 1.147 



1.9 

 1.9 



4.123 

 4.280 



.049 

 .012 



2.45 



G-l 



16.5 



50 



.80 









16.3 















.031 



1.63 



















F-7 



16.0 

 17.0 



50 1 50 

 50 50 



6.5 

 6.5 



1.152 

 1.152 



2.0 

 2.0 



4.198 

 4.315 



.050 

 .009 



2.43 



G-3 



.80 









16.5 













.029 



1.62 

















F-6 



17.0 

 16.0 



50 i 50 

 50 50 



8 

 8 



1.159 

 1.159 



2.6 

 2.6 



4.135 

 U.673 



.047 

 .008 



2.00 



G-7 



1.15 













16.5 















.027 



1.58 









1 









1 Short specimen. 

 Average moisture in specimens about 5 per cent. 



