24 
THE PURCHASE OF COAL UNDER SPECIFICATIONS. 
ANALYSES of coals delivered to the government. 
The following tables, giving the results of tests made by the 
Geological Survey on coal delivered to the Government Departments, 
are submitted in response to numerous recent requests for informa- 
tion regarding the quality of coal which may be expected, and the 
variations in quality which may be found from month to month in 
coal delivered by the same dealer and presumably from the same 
mine or group of mines: 
Average analyses of anthracite coal delivered to all Government buildings in 
Washington, D. C, from December 15, 1906, to April 26, 1907. a 
Furnace. 
Egg. 
Pea. 
Buck- 
wheat. 
Dry coal: 
2.42 
87.14 
10.44 
3.10 
86.33 
10.57 
3.02 
80.94 
16.04 
2.42 
79.53 
Ash 
18.05 
100.00 
100.00 
100.00 
100.00 
Sulphur h 
B. t. u 
Coal as received: 
.79 
13,408 
4.08 
12,861 
.98 
13,523 
4.16 
12,961 
.80 
12,487 
4.81 
11,886 
.68 
12,107 
5.09 
B. t. u 
11,48-5 
a Payment not based on chemical analysis. 
*> Separately determined. 
Analyses of anthracite furnace coal delivered during 1907 to a Government 
building in Washington, D. C. a 
Jan. 29. 
Feb. 2. 
Feb. 4. 
Feb. 9. 
Feb. 11. 
Feb. 12. 
Feb. 14. 
Feb. 15. 
Dry coal: 
Volatile matter- 
Fixed carbon 
Ash 
2.66 
86.38 
10.96 
2.85 
86.34 
10.81 
3.32 
87.66 
9.02 
2.53 
86.65 
10.82 
3.06 
85.45 
11.49 
2.56 
86.69 
10.75 
2.99 
86.63 
10.38 
2.09 
86.15 
11.76 
100.00 
100.00 
100.00 
100.00 
100.00 
100.00 
100.00 
100.QP 
Sulphur b 
B. t. u 
Coal as received: 
Moisture 
B. t. u 
.78 
13,297 
4.13 
12,749 
.78 
13,435 
4.19 
12,874 
.78 
13,764 
4.67 
13,121 
.78 
13,418 
4.41 
12,826 
.69 
13,282 
3.83 
12,773 
.84 
13,360 
5.83 
12,582 
.83 
13,427 
4.99 
12,757 
.95 
13,168 
4.33 
12,595 
Feb. 23. 
Feb. 25. 
Feb. 26. 
Feb. 27. 
Feb. 28. 
Mar. 13. 
Average. 
Dry coal: 
Volatile matter 
1.56 
87.96 
10.48 
1.62 
87.77 
10.61 
2.00 
88.61 
9.39 
3.34 
86.12 
10.54 
2.84 
85.37 
11.79 
2.13 
87.22 
10.65 
2.51 
Fixed carbon 
86.74 
Ash..__ 
10.75 
100.00 
100. 00 
100.00 
100.00 
100.00 
100.00 
100.00 
Sulphur 6 
.93 
13,094 
3.06 
12,694 
.78 
13,346 
3.50 
12,879 
.74 
13,655 
3.93 
13,118 
.87 
13,390 
4.50 
12,787 
.83 
13,166 
5.60 
12,429 
.79 
13,421 
2.12 
13,136 
81 
B. t. u 
13,363 
4.24 
12,796 
Coal as received: 
Moisture _._ 
B. t. u_ 
a Contract for 4,500 tons. Payment not based on chemical analysis. 
6 Separately determined. 
