32 
BULLETIN 607, U. S. DEPARTMENT OF AGRICULTURE. 
Table 7. — Treatment of paving blocks with mixtures of creosote No. 4 and carbon-free 
gas -house tar No. 3. 
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." 
3 
Inches. 
7.71 by 3.77 by 4.0... 
8.15 by 3.62 by 4.15.. 
Pounds. 
2.770 
2.820 
Pounds 
per 
cubic 
foot. 
16.1 
12.4 
\75 per cent creosote, 
/ 25 per cent tar. 
Pounds 
per 
square 
inch. 
J 80 
\ 80 
Hours. 
4§ 
260 
34 
340 
14.3 
300 
7. 75 by 3.45 by 4.0... 
8.15 by 3.55 by 4.2... 
2.580 
2.880 
150 per cent creosote, 
/ 50 per cent tar. 
/ 0) 
1 ( 2 ) 
6i 
7" 
57 
19.0 
12.2 
640 
52 
715 
15.6 
677 
7.75 by 3.85 by 4.0... 
8.15 by 3.60 by 4.1... 
2.920 
2.855 
125 per cent creosote, 
/ 75 per cent tar. 
/ ( 2 ) 
1 ( 3 ) 
7 
9 
17.0 
9.6 
715 
44 
790 
13.3 
752 
7.75 by 3.10 by 4.0... 
7.95 by 3.60 by 4.0... 
2.335 
2.660 
J-100 per cent tar 
I ( 5 ) 
7| 
8 
29 
18.6 
11.9 
15.2 
827 
6 
865 
846 
i Four hours at 80 pounds; 1 hour to obtain pressure up to 150 pounds; li 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 pressiire up to 150 pounds; 2h hours at 150 pounds. 
* Four hours at 80 pounds; 1 hour to obtain pressure up to 150 pounds; 2% hours at 150 pounds. 
s Four hours at 80 pounds; 1 hour to obtain pressure up to 150 pounds; 3 hours at 150 pounds. 
In all tests | hour was taken to obtain pressure up to 80 pounds. 
Table 8. — 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. 1 with different 
amounts of free carbon (normal amount of free carbon in tar, 6 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. 
Pre- 
serva- 
tive 
ab- 
sorbed. 
Specimen No. 
Tar 
No.l. 
Creo- 
sote 
No. 4. 
Free 
carbon 
in mix- 
ture. 
Specific 
gravity 
at 
140° F. 
(60° C.) 
Viscos- 
ity at 
160° F. 
(Engler 
visco- 
sime- 
ter. 
Aver- 
age 
longi- 
tudinal 
pene- 
tration. 
K-4 
22.0 
15.0 
18.5 
P. ct. 
by vol- 
ume. 
50 
50 
P. ct. 
by vol- 
ume. 
50 
50 
P. ct. 
by 
weight. 
Trace. 
Trace. 
1.127 
1.127 
1.6 
1.6 
Lbs. 
4.008 
3.444 
Lbs. 
.200 
.151 
Ins. 
5.20 
R-5 
3.98 
Average 
.176 
4 89 
50 
50 
50 
50 
1 
1 
1.128 
1.128 
1.7 
1.7 
4.180 
3.250 
K-6 
23.0 
17.0 
.122 
.130 
4 55 
R-2 
3 50 
Average 
20.0 
.126 
4.03 
K-3 
50 
50 
50 
50 
1.5 
1.5 
1.129 
1.129 
1.7 
1.7 
3.616 
1.444 
21.0 
.100 
.0S7 
3 97 
R 
16.0 
2 73 
Average 
18.5 
.094 
3 35 
50 
50 
50 
50 
2.5 
2.5 
1.130 
1.130 
1.5 
1.5 
4.390 
3.312 
K-7 
21.0 
16.0 
.098 
.078 
3.82 
2 SO 
R-3 
Average 
18.5 
.0S8 
3 31 
50 
50 
50 
50 
3 
3 
1.132 
1.132 
1.7 
1.7 
4.095 
3.783 
K-5 
20.0 
16.0 
.063 
.060 
3.12 
2 73 
R-7 
Average 
18.0 
.062 
2.93 
Average moisture in specimens about 11 per cent. 
