OF THE CRITICAL VELOCITY OF WATER WITH TEMPERATURE. 
53 
Table I. — continued. 
Number of 
experiment. 
Temperature, 
° C. 
Time, 
seconds. 
Total weight 
of water 
discharged, 
pounds. 
Difference of 
head in 
centimetres 
of water. 
. logr, 
V in feet per 
second. 
^ log ll, 
h' in feet of 
water. 
44 
34-5 
157-70 
4-329 
0-871 
1-7541 
2-4553 
45 
34-5 
105-60 
5-563 
1-713 
-0372 
2-7490 
46 
34-4 
96-68 
3-745 
1-214 
1 - 9037 
2-5995 
1 47 
34-4 
158-10 
4-122 
0-767 
1-7317 
2-4001 
I 48 
34-3 
222-02 
3-487 
0-463 
1-5117 
2-1809 
49 
34-2 
1.38-63 
2-105 
0-458 
1-4969 
2-1762 
50 
34-2 
301-23 
3-551 
0-357 
1-3870 
2-0680 
51 
38-0 
251-10 
9-849 
1-179 
1-9098 
2-5866 
52 
38-0 
141-37 
6-872 
1-477 
-0031 
2-6844 
5.3 
37-9 
112-45 
3-893 
1-027 
1-8556 
2-5265 
54 
37-8 
265-68 
6-681 
0-719 
1-7169 
2-3717 
55 
37-8 
194-45 
3-518 
0-497 
1-5738 
2-2114 
56 
37-7 
162-95 
2-043 
0-371 
1-4144 
2-0844 
57 
37-7 
148-73 
2-318 
0-442 
1-5089 
2-1604 
1 
58 
42-4 
140-27 
5 - 365 
1-031 
1-8998 
2-5281 
59 
42-4 
121-07 
3-532 
0-779 
1-7820 
2-4064 
60 
42-3 
130-38 
2-879 
0-583 
1-6613 
2-2806 
61 
42-3 
158-38 
2-720 
0-474 
1-5520 
2-1907 
62 
42-2 
229-33 
3-384 
0-397 
1-4860 
2-1137 
63 
42-2 
167-63 
1-825 
0-294 
I - 3541 
3-9832 
64 
42-1 
124-75 
4-365 
0-933 
1-8611 
2-4848 
65 
49-5 
213-65 
3-673 
0-417 
1-5539 
2-1351 
66 
49-4 
268-15 
7-015 
0-637 
1-7362 
2-3191 
67 
49-3 
162-93 
5-766 
0-836 
I - 8745 
2-4372 
68 
49-0 
303-75 
1-929 
0-153 
1-1214 
3-6997 
69 
48-9 
134-80 
2-383 
0-423 
1-5660 
2-1413 
70 
48-8 
162-05 
3-839 
0-578 
1 - 69.30 
2-2769 
71 
48-7 
139-88 
4-692 
0-794 
1-8440 
2-4148 
In this table the observations are recorded in Cohimns 2, 3, 4 and 5, and from 
Columns 3 and 4 the mean values of the velocity of the water in feet per second 
have been calculated, and the logarithms of these quantities are given in Column 6. 
The observed difierences of head given in Column 5 liave been reduced to feet of 
water, /d, to correspond, and the values of log h' are given in Column 7. 
In most cases, owing to the large volume of water in the tank (usually not less 
than 300 cubic feet), the temperature remained remarkably steady during the runs 
forming a series, and no correction for temperature was necessary, and none was 
made unless the temperature differed more than 0°T C. In some cases, however, a 
much greater variation was met with, especially at the higher temperatures, and 
correction was necessary, not only in this series, but in the second series when the 
