30 



BULLETIN 607, U. S. DEPARTMENT OF AGRICULTURE. 



Table 4. — Data upon the relative absorptions and penetrations into longleaf pine of 

 mixtures of equal parts of creosote No. 4 and three different carbon-free and normal free- 

 carbon tars. 





Aver- 

 age 



num- 

 ber 





Character of preservative. 



Weight 

 of speci- 

 men 

 directly 

 before 

 treat- 

 ment. 



Pre- 

 serva- 

 tive ab- 

 sorbed. 





Specimen No. 



TarNos. 1,2, 

 and 3. 



Creo- 

 sote 

 No. 4. 



Free 

 carbon 

 in mix- 

 ture. 



Specific 

 gravity 

 at 140° 

 F. (60° 

 C) 



Viscos- 

 ity at 

 160° F. 

 (Engler 

 vicosi- 

 meter). 



Aver- 

 age 

 longi- 





rings 



per 



inch. 



By 

 vol- 

 ume. 



Free 

 carbon 

 normal 

 to tar. 



pene- 

 tration. 



II 3 



24.0 

 18.0 



Per 

 cent. 

 50 

 50 



Per 

 cent. 

 6 

 6 



Per 



cent by 



volume. 



50 



50 



Per 



cent by 

 weight. 

 Trace. 

 Trace. 



1.127 

 1.127 



1.6 

 1.6 



Lbs. 



1.443 



2.826 



Lbs. 

 0.127 

 .200 



Ins. 

 3.75 



III-2 



4.19 









21.0 



.164 



3.97 



50 

 50 



16 

 16 



50 

 50 



Trace. 

 Trace. 



1.132 

 1.132 



1.7 

 1.7 



3.450 

 3.185 





II-8 



17.0 

 20.0 



.130 

 .080 



4.30 



III-5 



3.12 









18.5 



.105 



3.71 





50 

 50 



30 

 30 



50 

 50 



Trace. 

 Trace. 



1.127 

 1.127 



1.6 

 1.6 



3.010 



2.660 





II-5 



22.0 

 17.0 



.053 

 .076 



2.27 



IH-k 



2.18 









19.5 



.065 



2 23 





50 

 50 



6 

 6 



50 

 50 



3.0 

 3.0 



1.132 

 1.132 



1.7 

 1.7 



1.420 



1.386 





II-2-B 



18.0 

 24.0 



.038 

 .054 



2.05 



III-2-B 



2.00 







Average 



21.0 



.046 



2.03 



50 

 50 



16 

 16 



50 

 50 



8.0 

 8.0 



1.159 

 1.159 



2.6 

 2.6 



1.410 

 1.452 





II-l-A 



22.0 

 15.0 



.043 

 .029 



2.28 



III-6-B 



1.54 







Average 



18.5 



21.0 



18.0 



.036 



1.91 



50 

 50 



30 

 30 



50 

 50 



15.0 

 15.0 



1.166 

 1.166 



2.5 

 2.5 



1.466 

 1.318 





II-4-A 



.027 

 .017 



1.15 



III-2-A 



1.13 







Average 



19.5 



.022 



1.14 



1" 



1 











Average moisture in specimens about 8 per cent. 



