6 BULLETIN 586, TJ. S. DEPARTMENT OE AGRICULTURE. 
Table 6. — Mechanical analysis of trap rock used in surface construction of experiments 
1, 2, 3, and 4- 
Trap-rock 
chips. 
Retained 2-inch screen 
Passing 2-inch, retained on l|-inch screen. . 
Passing lj-inch, retained on lj-mch screen. 
Passing l|-inch, retained on 1-inch screen. . 
Passing 1-inch, retained on f-inch screen. . 
Passing f-inch, retained on §-inch screen. . 
Passing J-inch, retained on J-inch screen. . 
Passing J-inch, retained on 10-mesh sieve. . 
Passing 10-mesh sieve 
Total. 
100.0 
100.0 
1 Passing J-inch screen. 
Table 7. — Analysis of refined tars. 
Coal tar, refined. 
Water-gas tar, refined. 
Experiments Nos. 3 
and 4. 
Experiments Nos. 1, 
2, and 5. 
1.206 
2'38" 
84.99 
14.96 
.05 
1.150 
2'34" 
98.28 
1.65 
.07 
Float test 50 °C 
Soluble in CS 2 (total bitumen) . .per cont. . 
Free carbon do 
Inorganic residue upon ignition do 
Distillation. 
Char- 
acter. 
Per 
cent 
by 
volume. 
Per 
cent 
by 
weight. 
Char- 
acter. 
Per 
cent 
by 
volume. 
Per 
cent 
by 
weight. 
Water 
Trace. 
do... 
Cloudy. 
do... 
do... 
0.0 
.0 
.2 
10.2 
10.0 
79.6 
0.0 
.0 
.1 
7.9 
8.1 
83.8 
Trace. 
do... 
do... 
Cloudy. 
do... 
0.0 
.0 
.0 
19.0 
12.4 
68.6 
0.0 
First light oils (to 110°C) 
Second light oils (110° to 170°C) 
.0 
.0 
Heavy oils (170° to 270°C) 
Heavy oils (270° to 300°C) 
Pitch 
16.5 
10.2 
73.3 
100.0 
100.0 
100.0 
100.0 
Table 8. 
— Analyses of petroleum J 
products. 
Oil as] 
ahalts. 
Residual 
asphaltic 
petroleum. 
Experi- 
ment No. 
6. 
Experi- 
ment Nos. 
2 and 4. 
Experi- 
ment Nos. 
7 and 8. 
1.040 
49 
1.053 
58 
0.993 
Float test at 50°C (time) 
0'28" 
14.9 
Penetration at 25 °C, 100 grams, 5 sec. 
Loss,5hrs., 163 C C, 20 grams, 
Penetration of residue, as above 
98 
3.01 
58 
27.70 
17.25 
58 
per cent. - 
13.98 
37 
30.05 
18.85 
Per cent of total bitumen insoluble in 
86°B naphtha 
18.88 
Fixed carbon. 
per cent. . 
do.... 
do.... 
do.... 
9.96 
Soluble in CS 2 (total bitumen) 
Organic matter insoluble 
Inorganic matter insoluble 
99.80 
.09 
.11 
99.80 
.17 
.03 
99.93 
.07 
.00 
100. 00 
100.00 
100.00 
