18 
EXPERIMENTAL WORK IN FUEL TESTING. 
Moisture determinations obtained by the use of different drying reagents. 
Sample of coal. 
Concentrated 
H 2 S0 4 . 
CaCl 2 , 
fused. 
CaCU, granular. 
Labora- 
tory 
num- 
ber. 
Field number. 
l.a 
2.1> 
l.a 
2.ft 
\, 
2.b 
Illinois No. 11 B 
3.46 
3.92 
6.34 
2.74 
7.62 
4.74 
1.38 
4.96 
3.56 
1.42 
3.62 
4.99 
3.60 
4.94 
5.90 
2.76 
f 3.42 
\ 3. 38 
I 
J 3.38 
\ 3.40 
3.86 
Illinois No. 13 
1 
1786 
1802 
Illinois No. 11 D 
6.26 
1801 
Illinois No. 7 D 
2.74 
1803 
Illinois No. 13 
7.46 
4.80 
1.18 
1804 
do 
1794 
1798 
4.80 
1812 
do 
3.46 
1817 
1.30 
1828 
3.46 
1835 
4.92 
3.60 
4.91 
4.58 
1837 
3.55 
3.23 
1807 
Indiana No. 4 
4.88 
5.82 
2.70 
5.08 
1808 
Illinois No. 12 
1836 
Illinois No. 13 
1838 
Illinois No. 18 
1842 
Illinois No. ID 
1.06 
1.02 
1843 
Colorado 
7.98 
7.40 
1845 
Illinois No. 11 D 
4. 12 
6.90 
3.46 
6.36 
1846 
Illinois No. 7D 
6.98 
1.24 
3.60 
6.88 
1.14 
1855 
Illinois No. 11 D 
1.14 
3.56 
.94 
1844 
Indiana No. 4 
1741 
Illinois No. 18 , 
3.32 
2.36 
3.38 
12.09 
2. 58* 
1.38* 
2.76* 
11. 58* 
1743 
Indian Territory 
1745 
do 
1753 
Illinois No. 14 
n Weighed as soon as cooled. 
b Weighed after standing in desiccator overnight. 
The values obtained over both granular and fused calcium chloride, 
where the sample was weighed as soon as cooled, are but little lower 
than the values obtained over sulphuric acid; but the values from the 
samples over calcium chloride when allowed to stand overnight are 
so decidedly lower as to show beyond a doubt the superiority of con- 
centrated sulphuric acid over calcium chloride as a desiccating reagent 
for coal. 
EFFECTS OF VARYING AMOUNTS OF SAMPLE AND OF DIFFERENCES IN 
DURATION OF HEATING ON RESULTS OBTAINED FOR MOISTURE. a 
The following results were obtained on (1) a very finely ground 
sample of Illinois coal, and (2) a fine sample of Indiana coal. They 
show the loss in weight which occurred when the samples were dried 
for different times, in different amounts, and under different condi 
tions. This change in weight represents not merely the loss of mois- 
ture, but includes any changes due to oxidation and other causes. 
These changes undoubtedly vary with the kind of coal and the condi- 
tion of the sample. 
a The official method for the determination of moisture is to heat 1 gram of the fine sample for one 
hour at 105° C in a drying oven. 
