ABSORPTION AND PENETRATION OF COAL TAR AND CREOSOTE. 



31 



Table 5. — Treatment of paving blocks with mixtures of creosote No. 4 and carbon-free 



tar No. 1. 



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. 



1 



Inches. 

 7.65 by 3.82 by 4.0... 

 8.10 by 3.65 by 4.0... 



Pounds. 

 2.685 

 2.715 



Pounds 



per 



cubic 



foot. 



16.8 



15.4 





Pounds 



per 



square 



inch. 



( 80 



\ 80 



Hours. 

 2 

 3 



140 



32 





220 









16.1 



180 





7.75 by 3.80 by 4.0... 

 8.10 by 3.50 by 4.2... 



2.826 

 2.820 



1 75 per cent creosote, 

 / 25 per cent tar. 



/ 80 

 \ 80 



24 

 3j 





11 



17.7 

 13.5 



180 



56 



260 









15.6 



220 





7. 95 by 3. 62 by 4. 0.. 

 7. 75 by 3. 55 by 4. 0. . 



2.560 

 2.665 



1 50 per cent creosote, 

 / 50 per cent tar. 



/ 80 

 \ 80 



6 



4 





26 



14.3 

 19.1 



460 



7 



300 









16.7 



380 





7. 65 by 3. 80 by 4. 0. . 



8. 20 by 3. 55 by 4. 15. 



2. 680 

 2.850 



1 25 per cent creosote, 

 / 75 per cent tar. 



1 ( 2 ) 



5i 

 6 





43 



14.8 

 13.7 



490 



10 .' 



565 









14.3 



527 





7. 67 by 3. 05 by 4.03. 

 8. 10 by 3. 60 by 4. 0. . 



2.170 

 2.670 



>100 per cent tar 



/ ( 2 ) 

 I ( 3 ^ 



6 



6J 





41 



16.7 

 14.1 



565 



58 



640 









15.4 



602 

















1 Four hours at 80 pounds; 1 hour to obtain pressure up to 150 pounds; 4 hour at 150 pounds. 



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



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



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



Table 6. 



-Treatment of paving blocks with mixtures of creosote No. 4 and carbon-free 

 tar No. 2. 



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. 



21 



Inches. 



7. 65 by 3. 80 by 4.0.. 



8. 05 by 3. 62 by 4.0.. 



Pounds. 

 2.880 

 2.655 



Pounds 



per 



cubic 



foot. 



17. 4 



13.7 



1 75 per cent creosote, 

 / 25 per cent tar. 



Pounds 



per 



square 



inch. 



} 80 



1 80 



Hours. 

 3 



4i 



220 



22 



340 







Average . . 



15.6 



280 





7. 75 by 4.0 by 4.0.. 

 8. 00 by 4. 2 by 3. 5.. 



2.970 

 2.780 



1 50 per cent creosote, 

 / 50 per cent tar. 



/ 80 



5i 

 6 





23 



17.6 

 14.7 



420 



60 



565 









16.2 



492 





7. 75 by 3. 90 by 4. 0.. 

 8. 15 by 3. 60 by 4. 0. . 



3.090 

 2.720 



\25 per cent creosote, 

 / 75 per cent tar. 



X ( 2 ) 



5 

 6i 





37 



14.5 



13.2 



415 



4 



640 







Average . . 



13.9 



19.4 

 14.1 



527 





7. 70 by 3. 95 by 4.0.. 

 8. 20 by 3. 58 by 4.0.. 



2.955 



2.880 



>100 per cent tar 



/ ( 3 ) 



5! 

 7 





5 



527 







715 









16.8 



621 

















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



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



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



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



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



