0 
PEOFESSOK E. G. COKER AND MR. S. B. CLEMENT ON THE VAPJATION 
water was used instead of water in contact with air and the gauge was in its normal 
position with the connecting U below. 
After some preliminary trials, seven complete series of runs were made, covering 
the range of temperature, and the observations made are recorded in Table II., and 
the logarithmic j^lots are shoAvn on fig. 4. 
As slight differences of temperature were now of much less importance, the j)lotted 
results lie much better upon the mean line, and enable the value of n to be determined 
with considerable accuracy. 
Table II. 
Number of 
experiment. 
Temperature, 
°C. 
Time, 
seconds. 
Total weight 
of water 
discharged, 
poimcls. 
Difference of 
head in 
centimetres of 
mercury. 
log- V, 
V in feet per 
•second. 
log h', 
]i' in feet of 
water. 
72 
4-0 
25 • 05 
11-849 
18-313 
- 9882 
•9119 
73 
4-0 
26-00 
10-791 
14-631 
-9313 
•8144 
74 
4-0 
36-20 
12-873 
11-353 
-8642 
•7042 
75 
4-0 
38-48 
13-559 
11-039 
•8602 
-6920 
76 
4-0 
49-30 
12-780 
6-520 
•7270 
•4633 
77 
4-0 
62-05 
13-198 
4-612 
•6410 
•3130 
78 
4-0 
98-08 
12-603 
1 - 945 
•4221 
1-9380 
■ 79 
4-1 
27-50 
12-868 
18-028 
•9834 
•9051 
80 
4-1 
34-83 
13-665 
13-327 
•9068 
•7738 
81 
4-1 
30-68 
11-999 
13-271 
•9054 
•7720 
82 
10-8 
31-10 
12-605 
13-422 
•9224 
•7763 
83 
10-8 
46-80 
12-748 
6-719 
•7484 
•4758 
84 
10-8 
62 - 95 
13-257 
4-300 
•6368 
•2820 
85 
10-8 
120-60 
13-235 
1-392 
• 3537 
1-7921 
86 
10-8 
25-86 
12 - 221 
17-469 
•9878 
•8908 
87 
10-9 
34 - 74 
13-131 
11-852 
•8908 
•7223 
88 
10-9 
5 - 58 
13-006 
5-137 
•6808 
• 3592 
89 
10-9 
100-00 
13-405 
1-967 
• 4406 
1-9423 
90 
21 * 2 
28-38 
12-037 
13-481 
•9416 
•7774 
91 
21-2 
34-62 
12-864 
10-701 
•8841 
•6771 
92 
21-2 
39-58 
12-444 
7-942 
•8815 
•5476 
93 
21-2 
51-27 
12-668 
5-280 
•7068 
•3703 
94 
21-2 
70-00 
13-094 
3-228 
•5859 
•1567 
95 
21 -2 
114-90 
12-797 
1-265 
• 3609 
T-7498 
96 
21 -2 
32-82 
12-894 
11-882 
•9803 
•7227 
97 
30-4 
26-81 
13-250 
16-206 
1-0090 
•8573 
98 
30-4 
24-66 
11-960 
16-145 
1-0009 
•8556 
99 
30-4 
28-93 
12-679 
13-536 
•9569 
•7791 
100 
30-4 
28-49 
12-851 
14-138 
• 9693 
•7979 
]01 
30-4 
31-75 
12-639 
11-472 
•9151 
•7072 
102 
30-4 
45-64 
12-908 
6-326 
•7665 
•4487 
103 
30 • 4 
61-05 
12-870 
3-743 
•6390 
•2208 
104 
30-4 
83 - 60 
12-580 
2-122 ' 
•4926 
1 • 9743 
105 
30-4 
127-70 
12-968 
1-082 
•3218 
1-6818 
106 
30-4 
25-11 
11-995 
15-725 
•9942 
•8442 
