TESTS ILLINOIS. 
55 
One mine sample was taken from this mine by the inspector for chemical analysis, 
was cut from the face of the second right entry, 1,500 feet northwest of the shaft. 
Th 
CHEMICAL ANALYSES." 
Mine 
sample 
Car sam- 
ple. 
Laboratory number. 
Air-drying loss 
Moisture 
Volatile matter 
Fixed carbon 
jAsh 
[Sulphur 
Hydrogen 
Carbon 
Nitrogen 
Oxygen 
Calorific value determined: 
Calories 
British thermal units . 
1661 
6.60 
12.90 
33.77 
42.25 
11.08 
3.78 
6,031 
10,856 
1702 
8.10 
11.93 
29.99 
43.90 
14.18 
4.29 
5. 21 
56. 94 
1.01 
18. 37 
5, 724 
10,303 
a For analyses of mine samples taken during the Exposition period see Bull. U. S. Geol. Survey No. 
261, 1905, p. 37. 
STEAMING TEST. 
Test 100, Illinois No. 6, washed. 
Size as shipped, run of mine. Size as used, over 1 inch, 4.7 per cent; \ inch to 1 inch, 19.3 per cent; 
\ inch to | inch, 21.5 per cent; under \ inch, 54.5 per cent. Duration of test, 10 hours. Kind of K^ate, 
plain. 
MISCELLANEOUS ITEMS. 
Heating value of coal B. T. U. per pound dry coal 
Force of draft: 
Under stack damper inch water 
Above fire do . . 
Furnace temperature °F 
Dry coal used per square foot of grate surfaee per hour pounds 
Equivalent water evaporated per square foot of water-heating surface per hour do. . 
Percentage of rated horsepower of boiler developed 
Water apparently evaporated per pound of coal as fired pounds 
Water evaporated from and at 212° F.: a 
Per pound of coal as fired do . . 
Per pound of dry coal do. . 
Per pound of combustible do . . 
Efficiency of boiler, including grate per cent 
Coal as fired: 
Per indicated horsepower hour pounds 
Per electrical horsepower hour do. . 
Dry coal: 
Per indicated horsepower hour do. . 
Per electrical horsepower hour do. . 
Test 106. 
.55 
.25 
2,213 
25.94 
3.39 
95.3 
4.69 
5.56 
6.56 
7.45 
49.64 
5. 09 
6.28 
4.31 
5.32 
o A better evaporation would have been obtained if boilers and gas-sampling apparatus had been in 
better condition, as they were later. 
