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- 
tion. 
Average 
pressure. 
Average 
longitu- 
dinal 
penetra- 
tion. 
Absorp- 
tion 
obtained. 
Penetra- 
tion 
obtained. 
Increase 
in 
pressure. 
Increase 
in 
time. 
Hours. 
2 
4.05 
. 6.33 
2 
2 
Pounds. 
0.165 
.164 
2.133 
.156 
.156 
Pounds 
per sq. in. 
80 
80 
80 
128 
155 
9.02 
7.46 
5.98 
6.57 
6.38 
Per cent. 
100 
99 
81 
95 
95 
Per cent. 
100 
83 
66 
73 
71 
Per cent. 



60 
94 
Per cent. 
10 
80 per cent creosote; 
20 per cent tar 
66| per cent creosote; 
33 £ per cent tar 
80 per cent creosote; 
20 per cent tar 
66 § per cent creosote; 
33£ per cent tar 
1102 
1217 
30 
30 
i Time varied. 
2 This absorption was obtained with an average of about 5| hours' treatment. The further increase in 
the time of treatment failed to increase the absorption. 
3 Pressure varied. 
See 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. A 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 
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 
180 
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 
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 
Average 
9.0 
0.085 
4.36 
IX-2 
10.0 
9.0 
210 
210 
2.480 
2.454 
0.094 
0.115 
4 76 
VII-2 
5 42 
Average 
9.5 
0.104 
5.09 
1 
Average moisture in specimens about 10 per cent. 
