THE CONSTANTS OF THE CUP ANEMOMETER. 
795 
Table VI. 
No. I. /= 113-3 ; two springs; June 20, Bar. = 29"77 ; Therm. = 73'5.* 
No. 
D. 
S. 
N. 
b. 
V. 
W. 
f". 
C. 
T. 
6. 
a. 
I. 
17 
180 
31-25 
0 
6-75 
0 
5-4 
16-5 
564 
O 
59-4 
9-749 
II. 
18 
39-25 
0 
8-48 
0 
10-2 
21-8 
638-6 
78-5 
7-145 
III. 
19 
42-5 
214 
9-18 
0-61 
12-5 
38-5 
1035-5 
48-6 
12-359 
IV. 
20 
46"75 
214 
1010 
0-61 
14-6 
40 
1068-6 
54-0 
10-422 
V. 
21 
50-6 
198-6 
10-93 
0-66 
17-13 
42 
1155-4 
61-2 i 
9-917 
VI. 
22 
55-7 
161-6 
12-03 
0-81 
20-9 
66-5 
1616-7 
55-8 
11-793 
VII. 
23 
58-5 
162-4 
12-64 
0-80 
23-2 
66-5 
1616-7 
55-8 
10-394 
VIII. 
25 
66-5 
128-8 
14-37 
1-01 
286 
88-7 
2171-6 
532 
12-148 
IX. 
27 
68 
116-6 
14-69 
1-12 
31-8 
101-2 
2650-9 
85-9 
14-868 
X. 
29 
72-5 
100 
15-66 
1-30 
36-4 
102-2 
2694-7 
82 1 
12-327 
XL 
32 
79 
886 
17-03 
1-47 
43-55 
115-1 
3236-1 
54-4 
12-697 
XII. 
35 
82-5 
87-6 
17-82 
1-485 
48-1 
129-5 
3712-3 
75-8 
13-276 
XIII. 
38 
89-3 
85-2 
19-29 
1-53 
57-15 
145 
4041-6 
72 
12-302 
XIV. 
41 
93-5 
86-1 
20-21 
1-51 
64-15 
169 
4543-0 
68-4 
12-461 
XV. 
44 
S7 
84-8 
20-96 
1-37 
69-2 
190 
5156-2 
54 
12-978 
XVI. 
48 
100-5 
72-3 
21-71 
1-80 
74-2 
213 
6012-6 
46-8 
14-669 
XVII. 
52 
108-8 
45-1 
23-50 
200 
88-79 
215 
6090-9 
54 
12-714 
The mean of the 17 = 11' 896. They differ more than might be expected, considering 
that V and T are pretty certain. The discrepancies evidently are connected with the 
fluctuations of W and F, and are a sort of measure of their uncertainty. It is also 
evident that they follow no law which might indicate the presence of any power of 
V' in the equation (I.), except the squares ; the values of 9 also show the effect of the 
disturbing influences. If, as is probable, the mean value of 9 is that at which a is a 
maximum, it is here 62 0, 3, and the a of No. V. should be the largest, the other should 
decrease as them 9 ' s recede from that value ; but nothing of the sort is observable. 
Table VII. 
No. II. y= L01‘3 ; June 15, Bar. = 29"63 ; Therm. =62. 
No. 
D. 
S. 
N. 
b. 
V. 
W. 
f">. 
C. 
T. 
0 . 
a. 
I. 
14 
180 
47 
204-6 
10-15 
0-64 
116 
20-7 
245 3 
72°-5 
1-456 
II. 
15 
55-2 
214-3 
11-48 
0-61 
15-0 
30 
358-7 
72 0 
2-045 
III. 
18 
72 
152-4 
15-555 
0-85 
28-15 
50 
612-3 
90-0 
2 229 
IV. 
21 
83-2 
115 
16-88 
1-13 
33-4 
53-5 
658-2 
77-4 
2-104 
V. 
24 
95-8 
91-4 
20-15 
1-42 
48-9 
96 
962-0 
75-6 
2-310 
VI. 
bis. 
27 
>> 
106 
868 
22-90 
1-70 
64-7 
r 121-5 
1 128 
1363-3 
1428-7 
77-4 
79-2 
2-657 
2-803 
VII. 
bis. 
30 
114-75 
81 
24-79 
1-61 
77-2 
/ 129 
1 144-5 
1460-8 
1596-4 
75-6 
70-2 
2-379 
2-631 
VIII. 
33 
121-5 
80 
26-25 
163 
87-8 
146 
1607-2 
75-6 
2-333 
IX. 
36 
138-5 
64-6 
29-92 
2-01 
118-5 
195 
2093-7 
72-0 
2-400 
X. 
39 
JJ 
147 
57-8 
31-76 
2 25 
140-3 
196 
2103-7 
75-6 
2132 
XI. 
45 
158-5 
63-6 
34-34 
2-05 
164-5 
269 
3003-0 
68-4 
2-634 
The mean of the 13 = 2-316. Here also there 
* The coefficients a, (3, and 7 depend on the air’s density, 
equations. 
is no appearance of the equation 
This must be allowed for in reducing the 
