36 
BULLETIN 835, U. S. DEPARTMENT OF AGRICULTURE. 
Table 22. — Extent of moisture move- 
ment in flames at various times. 
Flume . 
Number 
of davs . 
33 
58 
76 
96 
Per cent. 
Per cent. 
Per cent. 
Per cent. 
1 
34 
30 
30 
21 
3 
51 
53 
53 
37 
5 
59 
59 
61 
48 
10 
74 
75 
75 
66 
15 
83 
84 
84 
78 
20 
SO 
91 
90 
86 
30 
100 
100 
100 
100 
40 
106 
108 
106 
50 
112 
109 
From figure 5 it is seen that the curves for the movement of mois- 
ture have the same parabolic form as the curves in the preceding 
figures. A comparison of these curves with those for the vertical and 
horizontal flumes shows the importance of gravity in the rate and 
extent of movement of moisture by capillarity. 
The curves show that the rate of movement of moisture is rather 
more uniform over an extended period than in the vertical flumes. 
After the first two or three days 
there is a gradual slowing down 
of the rate of movement from 
day to day. Where the experi- 
ment is carried on for 50 days or 
more it is observed that the rate 
of movement is very slow at that 
time. 
Table 22 gives the extent of the 
movement of the moisture at 
various times, in percentages of 
the movement in 30 days. 
It is observed from Table 22 
that the relative rate of movement in the first three flumes day by 
day was about the same. In flume 96, however, the rate of movement 
of the moisture was relatively not so great during the forepart of 
the experiment, but that a more uniform rate of movement was 
maintained throughout. In the first three flumes more than one-half 
of the total 30-day distance had been traveled in three days, or one- 
tenth of the time, and in two-thirds of the time more than nine- 
tenths of the 30-day dis- 
i-ii T i j Table 23. — Relative movement of moisture, uy 
tance nad been traveled. percentage of movement, in flume 96. 
In flume 96 on the third 
day only about one-third 
of the distance had been 
traveled, and it was not 
until about the sixth day 
that one-half of the dis- 
tance had been traveled. 
From Table 23 it is 
found that on the thir- 
tieth day the moisture 
in flume 58 had moved but 40 per cent as far as in flume 96, while in 
flume 39 the moisture had moved one-half as far as in flume 96. 
All of these flumes when compared with flume 96 show a lesser 
relative movement during the latter part of the experiment than 
during the forepart of the experiment. This table shows also that 
the heavy soil as represented in flume 58 has a much less rapid rate 
of movement during the forepart of the experiment, but that the 
Flume. 
Number 
of days. 
39 
58 
76 
96 
206 
Per cent. 
Per cent. 
Per cent. 
Per ci >/t. 
Per cent. 
1 
80 
56 
90 
100 
117 
3 
69 
56 
91 
100 
CO 
5 
62 
50 
82 
100 
80 
10 
57 
46 
73 
100 
66 
15 
54 
44 
70 
100 
60 
20 
53 
43 
68 
100 
57 
30 
50 
40 
65 
100 
