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. 
2.700 
2.740 
Pounds 
per 
cubic 
feet. 
16.1 
15.3 
50 per cent creosote.. 
50 per 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 
7§ 
33 
48. .. 
17.7 
14.9 
415 
790 
16.3 
16.5 
16.8 
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 
5i 
2 
865 
39 
420 
16.7 
642 
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; 2h hours at 150 pounds. 
4 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 with 50 per cent creosote No. 
No. 3 having varying percentages of carbon. 
and 50 per cent 
tar 
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. 
0) 
( 2 ) 
Hours. 
7 
7| 
715 
20 
790 
15.6 
752 
7.75 by 3.85 by 4 
8.13 by 3.62 by 4 
3.220 
2.700 
50 per cent creosote. 
50 per cent tar with 
16 per cent carbon. 
3 
n 
n 
15 
18.5 
10.3 
790 
50 
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. 
8 
n 
H 
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. 
( 5 ) 
( 3 ) 
7i 
73 
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; 2^ hours at 150 pounds. 
4 Four and a half hours at 80 pounds; 1 hour to obtain pressure up to 150 pounds; 2\ hours at 150 pounds, 
5 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. 
