2G 
EXPERIMENTAL WORK IN FUEL TESTING. 
Impurities in coal as related to different grades of fineness, etc. — Continued. 
NO. 2346, MARYLAND NO. l.a 
Mechanical distribution of 
coal. 
Amount of ash in 
each class. 
Amount of sulphur 
in each class. 
Grade and class of coal. 
Per cent 
of entire 
sample 
in each 
grade. 
Amount in each 
class. 
As per 
cent of 
coal in 
the class. 
As per 
cent of 
entire 
sample 
of coal. 
As per 
cent of 
coal in 
the class. 
As per 
cent of 
Per cent 
of its own 
grade. 
Per cent 
of entire 
sample. 
entire 
sample 
of coal. 
1. 
2. 
3. 
4. 
5. 
6. 
7. 
~ . f 80 
5.05 
4.65 
52.06 
47. 94 
15.47 
12. 99 
0.781 
. 604 
2.00 
1.55 
0.101 
Dust t80to40 
.072 
9.70 
9.70 
33.45 
100. 00 
Fine, 40 to 10 . . . 
Specific gravity — 
Under 1.35 
81.40 
10.07 
3.75 
4.78 
27.10 
3.35 
1.25 
1.60 
6.25 
13.62 
25. 02 
61.48 
1.694 
.456 
.313 
.984 
.92 
1.25 
2.21 
9.04 
.249 
1.35 to 1.45... 
.042 
1.45 to 1.65 
.028 
Above 1.65 
.145 
100. 00 
33.30 

41.95 
Medium, 10 to 4 
Specific gravity — 
Under 1.35. 
63.60 
25.54 
5.85 
5.01 
26. 65 
10.70 
2.45 
2.10 
5.57 
13.77 
25.63 
57.63 
1.484 
1.473 
.628 
1.210 
.81 
1.21 
2.36 
8.14 
.224 
1.35 to 1.45 
.129 
1.45 to 1.65... 
.058 
Above 1.65 
.171 
100. 00 
41.90 
14.70 
Specific gravity — 
Under 1,35 -. 
39.15 
38.10 
10.84 
11.91 
5.75 
5.60 
1.60 
1.75 
6.45 
14. 16 
25.68 
55.90 
.371 
.793 
.411 
978 
.84 
1.07 
2.48 
7.28 
.048 
1.35 to 1.45... 
.060 
1.45 to 1.65... 
.040 
.127 
Sum 
100. 00 
14.70 
Total 
99.80 
99.60 
12. 180 
12.53 
1.49 
1.51 
NO. 2308 
PENNSYLVANIA 
NO. 6.6 
r. ^ f80 
5.50 
4.35 
55. 85 
44.15 
14.74 
12. 35 
0.811 
. 537 
2.36 
2.19 
0.130 
Dust t80to40 
.095 
9. 85 
Sum 
9.85 
20.40 
100. 00 
Fine, 40 to 10 
1 
Specific gravity— 
Under 1.35 
1.35 to 1.45 
88.36 
2.97 
1.98 
6.69 
17.85 
.60 
.40 
1.35 
6.44 
17.55 
28. 26 
67. 45 
1.149 
.105 
.113 
.911 
1.10 
2. 75 
4.04 
10. 20 
.196 
.016 
1.45 to 1.65 
.016 
Above 1.65 
.138 
Sum 
100. 00 
20. 20 
29. 75 
Specific gravity — 
Under 1.35 
81.38 
9.06 
2.68 
6.88 
24. 25 
2.70 
.80 
2.05 
6.15 
16.97 
29. 70 
63.95 
1.491 
.458 
.238 
1.311 
1.10 
2.39 
3.42 
11.39 
.267 
1.35 to 1.45 
.065 
1.45 to 1.65 
.027 
.233 
Sum 
100. 00 
29. 80 
39.70 
Coarse, 4 to 2 
Specific gravity— 
Under 1.35 
70.42 
13.86 
4.78 
10.94 
27. 95 
5.50 
1.90 
4.35 
6.21 
16.37 
29.57 
66.20 
1.736 
.900 
.562 
2.880 
1.07 
2.33 
2.47 
7.06 
.299 
1.35 to 1.45 
.128 
1.45 to 1.65 
.047 
Above 1.65 
.307 
Sum 
100. 00 
39.70 
Total 
99.70 
99. 55 
13. 202 
12. 61 
1.964 
Original sample 
1.76 
aSp. gr. of average lumps, 1.41; of selected lumps, 1.36. 
*>Sp. gr. of average lumps, 1.33; of selected lumps, 1.30. 
