ABSORPTION" AND PENETRATION OF COAL TAR AND CREOSOTE. 35 



Table 12. — Treatment of paving blocks with 50 per cent creosote No. 4 and 50 per cent 

 tar No. 2 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. 



35 



38 



Inches. 



7.65 by 3.80 by 4.0... 

 8.15 by 3.60 by 4.0... 



Pounds. 

 2.760 

 2.740 



Pounds 



per 



cubic 



feet. 



10. 1 



15.3 



50 per cent creosote.. 



50 j>er cent tar with 



5 per cent carbon. 



Pounds 



per 



square 



inch. 



80 



(') 



Hours. 

 6 

 6i 



460 

 640 









15.7 



550 





7.65 by 3.80 by 4.0... 

 8.10 by 3.62 by 4.0... 



2.750 

 2.690 



50 per cent creosote.. 



50 per cent tar with 



10 per cent carbon. 



( 2 ) 



( 3 ; 



5 



71 





33 



17.7 

 14.9 



415 



48 



790 









16.3 



602 





8.15 by 3.62 by 4.0... 

 7.68 by 3.80 by 4.0... 



2.790 

 2.760 



50 per cent creosote.. 



50 per cent tar with 



16 per cent carbon. 



( 4 ) 

 80 



8 

 5£ 





2 



39 



16.5 

 16.8 



865 

 420 









16.7 



642 





1 











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



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. 



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

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



Table 13. — Treatment of paving blocks toith 50 per cent creosote No. 4 and 50 per cent 

 tar No. 3 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. 



27 



Inches. 

 7.70 by 3.85 by 4 

 8.20 by 3.55 by 4 . . 



Pounds. 

 3.150 

 3.180 



Pounds 



per 



cubic 



feet. 



17.2 



13.9 



50 per cent creosote. 



50 per cent tar with 



9 per cent carbon. 



Pounds 



per 

 square 

 inch. 



C 1 ) 



( 2 ) 



Hours. 

 7 

 7\ 



715 



20 



790 









15.6 



752 





7.75 by 3.85 by 4 



3.220 



50 per cent creosote. 



50 per cent tar with 



16 per cent carbon. 



( 2 ) 

 ( 3 ) 







15 



18.5 

 10.3 



790 



50 



8.13 by 3.62 by 4 2.700 



827 













14.4 



808 





7.70 by 3.95 by 4 

 8.20 by 3.60 by 4.2... 



2.930 

 2.980 



50 per cent creosote . 



50 per cent tar with 



24 per cent carbon. 



S 



7| 

 7J 





53 



20.8 

 8.8 



790 



28 



810 









14.8 



800 





7.70 by 3.10 by 4 

 7.93 by 3.62 by 4 



2.345 



2.605 



50 per cent creosote. 



50 per cent tar with 



30 per cent carbon. 



8 



7i 

 7| 





51 



20.7 

 10.8 



752 



40 



827 









15.8 



789 



















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



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



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



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

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



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



