20 
EXPERIMENTAL WORK IN FUEL TESTING. 
bottles, which were securely closed with rubber stoppers. These 
bottles were kept in the laboratory and weighed from time to time. 
Moisture determinations were made on portions of the sample at the 
times of the weighings, allowance being made for the portions removed 
for this purpose. The following table gives the percentage of moisture 
originally present in the sample, the percentage of gain or loss in 
weight at the several weighings, and the time interval between the 
weighings; also the total time covered by the experiment: 
Alteration of weight of finely powdered coal. 
[Minus sign denotes loss.] 
Sample of coal. 
Days be- 
tween 
Change in 
weight. 
Labora- 
Moisture 
determina- 
tory 
Field number. 
weighings. 
tion. 
ber. 
Per cent. 
Per cent. 
1635 
5.10 
4 
0.17 
5.13 
20 
.47 
5.31 
42 
.46 
5.36 
25 
.19 
5.29 
172 
.00 
4.99 
Illinois No. 9B 
124 
-.33 
4.38 
387 
.96 
-.72 
1638 C 
12.34 
4 
.16 
12.58 
19 
.45 
12.12 
27 
.22 
12.03 
41 
.23 
11.79 
do 
172 
.00 
11.62 
263 
1.06 
-.72 
1638 E 
11.89 
4 
17 
11.97 
46 
1.07 
11.80 
41 
.40 
11.64 
do 
191 
.00 
11.06 
282 
1.64 
-.83 
1639 
4.03 
23 
.61 
4.03 
42 
.47 
4.38 
34 
.31 
4.53 
163 
.27 
4.37 
IllinoisNo.il B 
127 
-.12 
4.23 
389 
1.54 
.20 
1660 
3.25 
15 
.40 
3.26 
27 
.42 
3.47 
50 
.43 
3.89 
183 
.10 
3.60 
107 
.00 
3.57 
382 
1.35 
.32 
1844 
3.58 
7 
.22 
3.79 
34 
.48 
3.90 
183 
.53 
3.87 
West Virginia No. 13 
107 
.14 
3.63 
331 
1.37 
.05 
1867 
1.03 
24 
.24 
1.16 
191 
.15 
1.21 
108 
.07 
1.09 
323 
.46 
.06 
