ABSORPTION AND PENETRATION OF COAL TAR AND CREOSOTE. IS 
increased, the conditions of treatment being constant. Experiments 
were made to determine the effect on the absorptions and penetra- 
tions of tar and creosote mixtures of an increase in the time of treat- 
ment, the intensity of the pressure, or the temperature of the pre- 
PENETRANCE TESTS. 
(Data in Table 14.) 
a 8 
x 
1P4 
.24 
3 
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\ 
\ 
L 
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< 
5 
1 
i 
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1.10 
1.12 
s 
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(A » 12 
u .0 
2 
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it ^ N ,5 
L04 t.0Q 1.08 1.10 1.12 
SPECIFIC GRAVITY AT 140 F» (60 CJ 
Fig. 6.— The relative absorptions and penetrations into longleaf pine of various commercial creosotes. 
Point 
No. 
Creosote 
No. 
Kind of creosote. 
Creosote containing tar (estimated at about 10 per cent). 
Creosote. 
Pure coal-tar creosote. 
Creosote containing tar (estimated at less than 5 per cent). 
High-boiling creosote. 
Time of treatment, 2 hours; pressure, 75 pounds per square inch; temperature, 160° F. 
