CHANGES IN MOISTURE CONTENT. 
15 
Changes in moisture content of sample (No. 1638 E) of undried Illinois coal — Continued. 
SECOND SERIES— 10 GRAMS ON 3-INCH WATCH GLASS. 
Air of laboratory. 
Time interval between weighings. 
weight. 
Tempera- 
ture. 
Humid- 
ity. 
Grams. 
-0.0518 
- .0270 
- .0530 
- .2180 
- .2000 
- .1937 
+ .0692 
+ .0095 
- .0550 
- .0590 
- .0870 
Per cent. 
-0.52 
- .27 
- .53 
-2.18 
-2.00 
-1.94 
+ .69 
+ .095 
- .55 
- .59 
- .87 
c. 
25 
Per cent. 
50 
25 
24 
28 
25 
18 
27 
32 
32 
43 
2I5 hours 
36 
36 
63 
64 
35 
41 
48 davs 
55 
8.67 
THIRD SERIES— 14.5 GRAMS IN OPEN, WIDE-MOUTHED 2-OUNCE BOTTLE. 
10 minutes 
1£ hours 
3£ hours 
21 hours 
Stirred with spoon. 
24 hours 
Stirred with spoon. 
26 hours 
Stirred with spoon. 
42 hours 
Stirred with spoon. 
104 hours 
Stirred with spoon. 
15 days 
Stirred with spoon. 
48 days 
Total loss in 72 days 
-0. 003 
- .0135 
- .0340 
- .0890 
- .0020 
- .0995 
- .0025 
- .0850 
- .0015 
- .0625 
- .0010 
- .0875 
- .0015 
- .2538 
- .0010 
- .0500 
-0.02 
- .09 
- .23 
- .60 
- .01 
- .68 
- .02 
- .56 
.01 
- .42 
- .01 
- .60 
- .01 
-1.71 
- .01 
.35 
5.33 
Other experiments were likewise performed on a similar sample 
(No. 1639 C) of Illinois coal, which contained 4.12 percent moisture, 
although the coarse sample had been well air-dried before the prepara- 
tion of the fine sample. The changes in weight in the 1-gram sample 
spread on a watch glass, in the 10-gram sample spread on a watch 
glass, and in a portion (8.3 grams) allowed to stand exposed in an 
open, wide-mouthed 2-ounce bottle were as follows: 
Changes in moisture content of sample (No. 1639 C) of well-dried Illinois coal. 
FIRST SERIES— 1 GRAM ON 4-INCH WATCH GLASS. 
Air of laboratory. 
Time interval between weighings. 
weight. 
Tempera- 
ture. 
Humid- 
ity. 
Grams. 
-0. 0093 
- .0025 
- .0015 
+ .0045 
+ .0135 
+ .0070 
- .0170 
+ .0050 
Per cent. 
-0.93 
- .25 
- .15 
+ .45 
+1.35 
+ .70 
-1.70 
+ .40 
C. 
28 
Per cent. 
36 
25 
18 
27 
32 
63 
64 
35 
41 
0.13 
