64 
PRELIMINARY REPORT ON COAL-TESTING PLANT, [bull. 261. 
made on the raw coal, so it is impossible to say how great the improve- 
ment was except from the chemical analyses. The steam test on the 
washed coal is given in test No. 68, page 81. 
A washing test was also made on about 4^ tons of this coal for coking 
purposes. No test was made in the coke ovens of the raw coal, hence 
the coke produced can not be compared, but the chemical analyses 
show the improvement effected, as follows: 
Analyses of Indiana No. 1 coal, showing effect of washing. 
Washed coal 
for coking. 
Ash ... . 
Sulphur 
7.04 
2.03 
MISSOURI NO. 3. 
This sample consisted of a carload of slack from the Mendota Coal 
and Mining Company, operating at Mendota, Putnam County, Mo. 
Like most of the coals from northern Missouri and southern Iowa, this 
coal contains a heavy percentage of impurities, and the operators are 
very desirous of improving their product. It was for this reason that 
the above test was undertaken, as the results of this test will doubtless 
apply to the entire field in Putnam County, Mo., and Appanoose 
County, Iowa. 
The sample, consisting of 14,000 pounds of slack, was passed through 
rolls having an aperture of 1\ inches and then washed through the I 
modified Stewart jig. After the coal was crushed it was sampled and 
analyzed, giving the figures shown in the column marked "Raw coal" 
in the accompanying table. After washing it was again sampled and 
analyzed, with the results given in the second column of the table. | 
The refuse was also sampled and analyzed, with the results shown in 
the third column. 
Analyses of Missouri No. 3 coal and refuse, showing effect of washing. 
Moisture 
Ash 
Sulphur 
Weight, in pounds 
Calculated weight of coal, in pounds 
Raw coal. 
14.37 
28.39 
4.30 
14, 000 
8, 013 
Washed coal 
23.90 
7.59 
2.89 
045 
Refuse. 
23. 3: 
36. 7' 
3.9 
4,93 
1,96 
The refuse weighed 4,931 pounds. It appears from the chemics 
analysis that the raw coal contained 8,013 pounds of coal exclusive c 
