38 BULLETIN 607, U. S. DEPARTMENT OF AGRICULTURE. 



Table 17. — Summary of data contained in Table 16. 



Preservative. 



Average 

 time of 

 treat- 

 ment. 



Average 

 absorp- 



Average 



Average 

 longitu- 

 dinal 



Absorp- 

 tion 



Penetra- 

 tion 



Increase 

 in 



Increase 

 in 





tion. 





penetra- 

 tion. 



obtained. 



obtained. 



pressure. 



time. 









Pounds 















Hours. 



Pounds. 



per sq. in. 





Per cent. 



Per cent. 



Per cent. 



Per cent. 





2 



0.165 



80 



9.02 



100 



100 







1 



80 per cent creosote; 





20 per cent tar 



4.05 



.164 



SO 



7.46 



99 



83 







U02 



66§ per cent creosote; 



















33 J per cent tar 



6.33 



2.133 



80 



5.9S 



SI 



66 







1217 



80 per cent creosote; 



















20 per cent tar 



2 



.156 



12S 



6.57 



95 



73 



60 



3 



66f per cent creosote; 



















33 J percent tar 



2 



.150 



155 



6. 38 



95 



71 



94 



30 



i Time varied. 



2 This absorption was obtained with an average of about 5J hours' treatment. The further increase in 

 the time of treatment failed to increase the absorption. 



3 Pressure varied. 



Sec Note 1, Table 16. 



Table 18. — Data upon the relative absorptions and penetrations into longleaf pine of 

 a mixture of equal parts of creosote No. 4 and a normal by-product coke-oven tar No. 1 

 at different temperatures (normal amount of free carbon in tar 6 per cent, by weight). 



Specimen No. 



Average 



number 



annual 



rings per 



inch. 



Tempera- 

 ture. 



Weight of 



specimen 



directly 



before 



treatment. 



Preserva- 

 tive 

 absorbed. 



Average 

 longitudi- 

 nal pene- 

 tration. 



IX-6 



12.0 

 8.0 



°F. 

 160 

 160 



Pounds. 

 2. 570 

 2.630 



Pounds. 

 0.046 

 0.039 



Inches . 

 2.98 



VII-1 



2.92 









10.0 







0.042 



2.95 











IX-3 



9.0 

 11.0 



ISO 

 180 



2.605 

 2. 635 



0.045 

 0.075 



3.00 



VII-3 



4.23 









10.0 







0.060 



3.62 











IX-1 



11.0 

 9.0 



190 

 190 



2.728 

 2.473 



0.038 

 0.092 



3.18 



VII-7 



3.45 









10. 







0.065 



3.32 













IX-7 



10.0 

 8.0 



200 

 200 



2.578 

 2.615 



0. 067 

 0.103 



3.97 



VII-4 



4.76 









9.0 



I 



0.0S5 



4.36 









IX-2 



10.0 

 9.0 



210 1 2. 480 

 210 1 2.454 



0.094 

 0. 115 



4.76 



VII-2 



5.42 









9.5 1 - 0.104 



5.09 















Average moisture in specimens about 10 per cent. 



