Sioux City Academy of Science and Letters. 181 
If we let C—percentage of carbon in the lignite 
== f hydrogen ‘“ 
o=— 6é oxygen (73 (73 
S—— is sulphur. “ i 
The heating power will be 
8140C-+-34500 (H—2 ) +2220S. 
Substituting the values from Table V, No. 1, we have 
8140 x .5890-+-34500 (.0270—.0130) +2220 
-0086—5296.55 calories per kilogram of lignite. 
Converting to B. T. U. per pound of lignite: 
5296.55 X 1.8—=9533.8 B. T. U. per pound. 
The same calculation made for the Wyoming lignite 
coal, using values in Table V, No. 3: 
8140 <.7405--34500 (.0356—.0189) +2220 .0059 
—6616.9 calories per kilogram or 11910.4 B. T. 
U. per pound of lignite. (See Table VII.) 
Thus in heat giving power, on the basis of total com- 
bustion of actual combustibles, the Nebraska lignites pos- 
sess 80 per cent. of that of the Wyoming material, which 
has stood the test of extensive use and is pronounced by 
many of its users to be the best medium-priced fuel on 
the Sioux City market. Compared with the calorific 
power of other lignites (Table VIII), the Nebraska prod- 
uct averages well—even a trifle higher—also with that of 
German briquettes, and with that of the average bitumi- 
nous coals, it affords nearly 75 per cent. of heat. 
As the evaporation of the moisture contained in the 
fuel results in a direct loss in the calorific power, since 
it absorbs heat, these results would be lowered consider- 
ably if the freshly mined coal were considered. 
Gas-producing capacity.—The tests along this line are 
of interest. It is to be regretted that the available facil- 
ities and time for the work precluded a complete deter- 
mination of all the by-products of commercial value be- 
sides the coke, such as tar and ammoniacal water, and of 
the deleterious products, such as carbon dioxide and 
hydrogen sulphide, but as these were removed from the 
gas they do not contribute any error to the volume of 
purified gas produced. 
