34 



BULLETIN 607, IT. S. DEPARTMENT OF AGRICULTURE. 



Table 10. — Data upon the. relative absorptions and penetrations into longleaf pine of 

 mixtures of equal parts of creosote No. 4 and tar No. 3 containing different amounts of 

 free carbon {normal amount of free carbon in tar, 30 per cent, by weight). 





Aver- 

 age 



num- 

 ber 

 annual 



rings 

 per 



inch. 



Character of preservative. 



Weight 

 of speci- 

 men 

 direct- 

 ly be- 

 fore 

 treat- 

 ment. 



Pre- 

 serva- 

 tive 

 ab- 

 sorbed. 



Aver- 



Specimen No. 



Tar 

 No. 3. 



Creo- 

 sote 

 No. 4. 



Free 

 carbon 

 in mix- 

 ture. 



Specific 

 gravity 



at 

 140° P. 

 (60° C.) 



Viscos- 

 itv at 

 160° F. 

 (Engler 

 viscosi- 

 meter). 



longi- 

 tudinal 



pene- 

 tration. 



II-7 



11.0 

 15.0 



P. ct. 



by vol- 

 ume. 

 50 

 50 



P. ct. 



by vol- 

 ume. 

 50 

 50 



P.ct.by 



weight. 

 Trace. 

 Trace. 



1.127 

 1.127 



1.6 

 1.6 



Lbs. 



U.5S0 



4.187 



Lbs. 

 .053 

 .029 



Ins. 

 3.16 



H-4 



2.82 







Average 



14.5 











.041 



2.99 













II-5 



H-1 



14.0 

 12.0 



50 

 50 



50 

 50 



4.5 

 4.5 



1.133 

 1.133 



1.7 

 1.7 



4.665 

 11.667 



.045 

 .023 



2.30 

 1.69 



Average 



13.0 











.034 



2.00 















II-4 



12.0 

 12.0 



50 

 50 



50 



50 



6 

 6 



1.142 



1.142 



1.9 

 1.9 



4.453 

 4.357 



.019 

 .007 



2.25 



H-7 



1.13 









12.0 









.013 



1.69 















H-4A 



12.0 

 13.0 



50 

 50 



50 

 50 



8 

 8 



1.146 1 2.0 | U.704 

 1.146 2.0 | 4.097 



.031 

 .010 



1.50 



H-6 



1.25 







Average 



12.5 







.021 



1.38 











1I-7A 



14.0 

 13.5 



50 

 50 



50 

 50 



12 

 12 



1.152 

 1.152 



2.5 I 4.407 

 2.5 | 4.040 



.037 

 .007 



2.54 



H-5 



1.18 









13. S 













.022 



1.86 















II-3 



14.0 

 13.0 



50 

 50 



50 

 50 



15 

 15 



1.166 

 1.166 



2.5 



2.5 



11.826 

 1.664 



.038 

 .016 



3.00 



H-3 



1.39 









13.5 









1 



.027 



2.20 







1 





1 





i Short specimens. 

 Average moisture in specimens about 6 per cent. 



Table 11. — Treatments of paving blocks with 50 per cent creosote No. 4 and 50 per cent 

 tar No. 1 having varying percentages of carbon. 



Block 

 tag No. 



Dimensions of 

 block. 



Weight 

 before 

 treat- 

 ment. 



Preserv- 

 ative 

 absorbed. 



Preservative 

 used. 



Pressure. 



Time 

 of treat- 

 ment. 



Prod- 

 uct of 

 pres- 

 sure by 

 time. 



19 



Inches. 

 7.70 by 3.75 by 4.0... 

 8.15 by 3.50 by 4.2... 



Pounds. 

 2.830 

 2.860 



Pounds 



per 



cubic 



feet. 



15.0 



14.8 



50 per cent creosote.. 



50 per cent tar with 



li per cent carbon. 



Pounds 



per 



square 



inch . 



80 



(') 



Hours. 

 4 



300 



30 



495 









14.9 



16.2 

 15.2 



397 





7.70 by 3.84 by 4.0... 

 8.20 by 3.60 by 4.15.. 



2.855 

 2.900 



50 per cent creosote.. 



50 per cent tar with 



3 per cent carbon. 



80 

 ( 2 ) 



5 

 5J 





49 



380 



54... 



490 









15.7 



435 

















i Five hours at 80 pounds; 1 hour to obtain pressure up to 150 pounds. 



2 Four hours at 80 pounds; 1 hour to obtain pressure up to 150 pounds; one-half hour at 150 pounds. 



In all tests one-half hour was taken to obtain pressure up to 80 pounds. 



