32 



BULLETIN 607, U. S, DEPARTMENT OF AGRICULTURE. 



Table 7= — Treatment of paving blocks with 'mixtures of creosote No. 4 and carbon-free 



gas-house tar No. S. 



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. 



3 



Inches. 

 7.71 by 3.77 by 4.0... 

 8.15 by 3.G2 by 4.15.. 



Pounds. 

 2.770 

 2.820 



Pounds 



per 



cubic 



foot. 



16.1 



12.4 



1 75 per cent creosote, 

 /- 25 per cent tar. 



Pounds 



per 



square 



inch. 



/ 80 



\ 80 



Hours. 

 3J 

 4 



260 



34 



340 











300 





7. 75 by 3.45 by 4.0... 

 8.15 by 3.55 by 4.2... 



2.580 



2.880 





150 per cent creosote, 

 / 50 per cent tar. 



{ 



G) 



6J 



7" 





57 



19.0 

 12.2 



640 



52 



715 









15.6 



677 





7.75 by 3. 85 by 4.0... 

 8.15 by 3.60 by 4.1... 



2.920 

 2.855 



1 25 per cent creosote, 

 / 75 per cent tar. 



{ 



( 2 ) 

 ( 3 ) 



7 



7* 





9...., 



44 



17.0 

 9.6 



715 

 790 









13.3 



752 





7.75 by 3. 10 by 4.0... 

 7.95 by 3.60 by 4.0... 



2.335 

 2.660 



J-100 per cent tar 



{ 



( 4 > 

 ( 5 ) 



n 



8 





29 



18.6 

 11.9 



827 



6 



865 









15.2 



846 





1 















1 Four hours at 80 pounds; 1 hour to obtain pressure up to 150 pounds; 1J hours at 150 pounds. 



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

 i Four hours at 80 pounds; 1 hour to obtain pressure up to 150 pounds; 2J hours at 150 pounds. 

 i Four hours at 80 pounds; 1 hour to obtain pressure up to 150 pounds; 2J hours at 150 pounds. 

 - Four hours at 80 pounds; 1 hour to obtain pressure up to 150 pounds; 3 hours at 150 pounds. 



In all tests I hour was taken to obtain pressure up to 80 pounds. 



Table 8. — -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. 1 with different 

 amounts of free carbon (normal amount of free carbon in tar, 6 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. 





Specimen No. 



Tar 

 No. 1. 



Creo- 

 sote 

 No. 4. 



Free 

 carbon 

 in mix- 

 ture. 



Specific 

 gravity 



at 

 140° F. 

 (60° C.) 



Viscos- 

 ity at 



160° F. 



(Engler 

 visco- 

 sime- 

 ter. 



Aver- 

 age 



longi- 

 tudinal 



pene- 

 tration. 



K-4 



22.0 

 15.0 



18.5 



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. 

 4.008 

 3.444 



Lbs. 



.200 

 .151 



Ins. 

 5.20 



R-5 



3.98 









.176 



4.89 





50 

 50 



50 



1 



1.128 

 1.128 



1.7 

 1.7 



4.180 

 3.250 





K-6 



23.0 



17.0 



.122 

 .130 



4.55 



R-2 



50 1 



3.50 





20.0 



21.0 



16.0 







.126 



4.03 





50 

 50 



50 

 50 



1.5 

 1.5 



1.129 

 1.129 



1.7 

 1.7 



3.616 

 1.444 





K-3 



R 



.100 



.087 



3.97 

 2.73 





18.5 



.094 



3.35 





50 

 50 



50 

 50 



2.5 

 2.5 



1.130 

 1.130 



1.5 

 1.5 



4.390 

 3.312 





K-7 



R-3 



21.0 

 16.0 



.098 

 .078 



3.82 

 2. SO 





18.5 



20.0 

 16.0 



.088 



3.31 





50 

 50 



50 

 50 



3 

 3 



1.132 

 1.132 



1.7 

 1.7 



4.095 

 3.783 





K-5 



.063 

 .060 



3.12 



R-7 



2.73 









18.0 



.062 



2.93 



















Average moisture in specimens about 11 per cent 



