ABSORPTION AND PENETRATION OE COAL TAR AND CREOSOTE. 31 
Table 5. — -Treatment of paving blocks with mixtures of creosote No. 4 and carbon-free 
tar No. 1. 
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. 
1 
Inches. 
7.65 by 3.82 by 4.0... 
8.10 by 3.65 by 4.0... 
Pounds. 
2.685 
2.715 
Pounds 
per 
cubic 
foot. 
16.8 
15.4 
Pounds 
■per 
square 
inch. 
( 80 
\ 80 
Hours. 
2 
3 
140 
32 
220 
16.1 
180 
7.75bv3.80by4.0... 
8.10 by 3.50 by 4.2... 
2.826 
2.820 
1 75 per cent creosote, 
/ 25 per cent tar. 
/ 80 
\ 80 
11 
56 
17.7 
13.5 
180 
260 
15.6 
220 
7. 95 by 3. 62 by 4. 0. . 
7. 75 by 3. 55 by 4.O.. 
2.560 
2.665 
1 50 per cent creosote, 
/ 50 per cent tar. 
/ 80 
\ 80 
6 
4 
26 
14.3 
19.1 
460 
7 
300 
16.7 
380 
7. 65 by 3. 80 by 4.0.. 
8. 20 by 3. 55 by 4. 15. 
2.680 
2.850 
"1 25 per cent creosote, 
/ 75 per cent tar. 
t ( 2 ) 
6 
43 
14.8 
13.7 
490 
10 
565 
Average . . 
14.3 
527 
7. 67 by 3. 05 by 4. 03 . 
8. 10 by 3. 60 by 4.0.. 
2.170 
2.670 
J-100 per cent tar 
/ ( 2 ) 
I ( 3 ) 
6 
6J 
41 
16.7 
14.1 
565 
58 
640 
15.4 
602 
1 Four hours at 80 pounds; 1 hour to obtain pressure up to 150 pounds; I hour at 150 pounds. 
2 Four hours at 80 pounds; 1 hour to obtain pressure up to 150 pounds; 1 hour at 150 pounds. 
3 Four hours at 80 pounds; 1 hour to obtain pressure up to 150 pounds; 1§ hours at 150 pounds. 
In all tests § hour was taken to obtain pressure up to 80 pounds. 
Table 6.— Treatment of paving blocks with mixtures of creosote No. 4 and carbon-free 
tar No. 2. 
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. 
21 
Inches. 
7. 65 by 3. 80 by 4.0. . 
8. 05 by 3. 62 by 4.O.. 
Pounds. 
2.880 
2.655 
Pounds 
per 
cubic 
foot. 
17.4 
13.7 
\ 75 per cent creosote, 
/ 25 per cent tar. 
Pounds 
per 
square 
inch. 
f 80 
1 80 
Hours. 
3 
4J 
220 
22 
340 
Average.. 
15.6 
280 
7. 75 by 4.0 by 4.0.. 
8. 00 by 4. 2 by 3. 5.. 
2.970 
2.780 
1 50 per cent creosote, 
/ 50 per cent tar. 
/ 80 
1 0) 
5i 
6 
23 
17.6 
14.7 
16.2 
420 
60 
565 
Average . . 
492 
7. 75 by 3. 90 by 4.0.. 
8. 15 by 3. 60 by 4. 0. . 
3.090 
2.720 
1 25 per cent creosote, 
/ 75 per cent tar. 
t ( 2 ) 
5 
6i 
37 
14.5 
13.2 
415 
4 
640 
Average . . 
13.9 
527 
7. 70 by 3. 95 by 4.0.. 
8. 20 by 3. 58 by 4. 0. . 
2.955 
2.880 
|l00 per cent tar 
/ ( 3 ) 
\ ( 4 ) 
5i 
7 
5 
19.4 
14.1 
527 

715 
Average . . 
16.8 
621 
1 Four hours at 80 pounds; 1 Tiour to obtain pressure up to 150 pounds; 1 hour at 150 pounds. 
2 Four hours at 80 pounds; 1 hour to obtain pressure up to 150 pounds; 1J hours at 150 pounds. 
3 Four hours at 80 pounds; 1 hour to obtain pressure up to 150 pounds; f hour at 150 pounds. 
* Four hours at 80 pounds; 1 hour to obtain pressure up to 150 pounds; 2 hours at 150 pounds. 
In all tests $ hour was taken to obtain pressure up to 80 pounds. 
