ABSORPTION AND PENETRATION OF COAL TAR AND CREOSOTE. 33 
Table 9. — 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. 2 containing 
different amounts of free carbon {normal amount of free carbon in tar, 16 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. 
Aver- 
longi- 
tudinal 
pene- 
tration. 
Specimen No, 
Tar 
No. 2. 
Creo- 
sote 
No. 4. 
Free 
carbon 
in mix- 
ture. 
Specific 
gravity 
at 
140° F. 
(60°C.) 
Viscos- 
ity at 
160° F. 
(Engler 
viscosi- 
meter). 
Pre- 
serva- 
tive 
ab- 
sorbed. 
F-4 
16.5 
15.0 
P. ct. 
by vol- 
ume. 
50 
50 
P. ct. 
by vol- 
ume. 
50 
50 
P.ct.by 
weight. 
Trace. 
Trace. 
1.132 
1.132 
1.7 
1.7 
Lbs. 
4.021 
4.115 
Lbs. 
0.071 
.025 
Ins. 
2.61 
G-5... 
1.39 
15.8 
.048 
2.00 
F-l 
17.0 
16.0 
50 
50 
50 
50 
3 
3 
1.140 
1.140 
1.9 
1.9 
4.178 
4.376 
.064 
.016 
2.82 
G-2 
1.10 
16.5 
.040 
1.96 
F-3 
16.0 
16.5 
50 
50 
50 
50 
5 
5 
1.147 
1.147 
1.9 
1.9 
4.123 
4.280 
.049 
.012 
2.45 
G-l 
.80 
16.3 
.031 
1.63 
F-7 
16.0 
17.0 
50 
50 
6.5 
6.5 
1.152 
1.152 
2.0 
2.0 
4.198 
4.315 
.050 
.009 
2.43 
G-3 
50 50 
.80 
16.5 
.029 
1.62 
F-6 
17.0 
16.0 
50 
50 
50 
50 
8 
8 
1.159 
1.159 
2.6 
2.6 
4. 135 
U.673 
.047 
.008 
2.00 
G-7 
1.15 
16.5 
.027 
1.58 
1 Short specimen. 
Average moisture in specimens about 5 per cent. 
