104 PRELIMINARY REPORT ON COAL-TESTING PLANT, [bull. 261. 
Average composition of coal and gas. 
coal. Per cent. 
Moisture 11. 40 
Volatile matter 34. 55 
Fixed carbon 43. 31 
Ash 10.74 
Sulphur 1.72 
gas by volume. Percent. 
Carbon dioxide 9. 04, 
Oxygen 36 
Carbon monoxide 18. 67 
Hydrogen 8.00' 
Methane 4. 84 
Nitrogen 59. 1 J 
100. 01! 
The Montana No. 1 coal was a washed slack. It made good gas, 
but was too fine to be burned at the rated output of the producer. It 
clinkered badly, causing the blast to break through the bed in two or 
three places and make bad holes. The test is valuable principally ad 
a demonstration that good gas can be made from coal of this class. 
It is recommended that a water seal type of producer be used fori 
fuel of this class, and also that the coal be fed in sizes not smaller thaJ 
chestnut. In using lump coal the producer should be 20 per cenl 
larger for the same horsepower than one running on ordinary coals 
and for slack from 25 to 30 per cent larger. 
After this test the bed of ashes was drawn from the producer, as] 
the large clinkers would have been detrimental to the next following] 
test. 
COAL, NORTH DAKOTA NO. 2; PRODUCER-GAS TEST NO. 10.* 
[Coal from the mine of the Cedar Coulee Coal Company, near Williston, N. Dak.; tested November! 
14, 15, 1904.] 
Duration of test hours . . 30 
Total coal consumed in producer pounds . . 13, 800 
Moisture in coal per cent. . 39. 5( 
Dry coal consumed in producer pounds. . 8, 340 
Refuse from dry coal per cent. . 10. 5< 
Total refuse from coal pounds. . 878 
Total combustible consumed in producer do 7, 462 
Coal consumed, pounds per hour. 
Coal consumed in producer 460 
Dry coal consumed in producer 278 | 
Combustible consumed in producer 249 
Equivalent coal used by producer plant 510 \ 
Equivalent dry coal used by producer plant 308 
Equivalent combustible used by producer plant 275. 8] 
British thermal units. 
Per pound of coal as fired 6, 802 
Per pound of dry coal 11, 255 
Per pound of combustible 12, 600 
Per cubic foot of standard gas 188. 5 
From standard gas per pound dry coal burned in producer 7, 830 
From standard gas per hour per brake horsepower 13, 770 
*Gas-producer hopper leaked. 
