THE CONSTANTS OF THE CUP ANEMOMETER. 
797 
The mean of the six — 2'502. The a of No. II. reduced to the present density 
= 2‘288. The irregularity of W is notable, as also that XI. with a larger D has only 
the same V as X. As it was at this period necessary to prepare for the erection of 
the Vienna equatorial, I could not repeat these experiments, but the results obtained 
with Nos. I. and III. leave no room for doubting that a similar agreement would be 
found here with No. II. 
(29.) No. V. wal not tried this way. The less exact method of gradually increasing 
the brake friction till the anemometer stopped, gave by two observations a=10'400 on 
June 2, Bar. 30 - 06, Therm. 71. 
(30.) After these preliminary details I proceed to state the experimental results, 
beginning with those of No. 1. The first 79 of these were obtained while the 
centrifugal pressure was opposed by a single friction roller, and the second set 
(80 to 123) were taken after two were applied. 
Most of the headings of the tables have been already explained; rn — — — — the 
ratio of the wind’s velocity to that of the anemometer ; p is the factor to reduce the 
air’s density when a was measured to that at each observation. 
Table X. 
No. I. /= 1 13 '2 ; May 8, Bar. 30’37 ; Therm. 52. 
No. 
D. 
S. 
N. 
A. 
b. 
V. 
V. 
W. 
! f". 
Log. p. 
m . 
1 
15 
240 
33 
39 
290 
535 
1-39 
0 - 45 
6-5 
0-06616 
3519 
2 
16 
180 
32-6 
34-8 
242 
7-04 
1-66 
0-54 
11 
3-935 
3 
18 
180 
41-3 
52 
173-3 
8-92 
2-475 
0-74 
17 2 
3-301 
4 
20 
180 
48-71 
65 
147-3 
10-52 
3-09 
0-89 
22-9 
3-115 
5 
24 
180 
60-4 
85-17 
122-3 
13-05 
405 
1-095 
39-2 
2-948 
6 
28 
180 
69 
103-7 
104 
14-91 
4-94 
1-26 
471 
2-7655 
7 
33 
240 
103 3 
160-2 
96-2 
16-74 
5-72 
1-36 
77-35 
2-689 
8 
39 
240 
119 
191-5 
81-8 
19-28 
6-84 
1-59 
101-6 
2 587 
9 
46 
240 
133-9 
216-2 
74 
21-695 
7-72 
1-765 
1383 
2-582 
10 
52 
180 
106-33 
181-5 
67-5 
22-97 
8-64 
1-93 
158-6 
2-435 
11 
58 
180 
113 
198 
63-5 
24-41 
9425 
2’05 
184-7 
2-372 
12 
66 
180 
123 5 
216-9 
58 
26 68 
10-32 
2-25 
229-95 
2"366 
13 
75 
240 
1785 
310 
53-6 
28-92 
11-07 
2-43 
296-7 
y> 
2-393 
B 
= 3 oz. 
;/+ B 
' = 398-0. 
No. 
D. 
S. 
N. 
A. 
b. 
V. 
V. 
W. 
/"’■ 
Log. p. 
m. 
14 
18 
240 
42-5 
19-5 
159-8 
6-89 
0-70 
0-815 
10-5 
0-06616 
0-872 
15 
20 
240 
56-^8 
51 67 
101-6 
9-17 
1-845 
1-28 
18-9 
4-272 
16 
20| 
240 
59 9 
64-12 
110-8 
9 71 
2-18 
1-18 
21-4 
3-955 
17 
2-3i 
240 
71-67 
82 
956 
| 11-61 
2-93 
1-36 
32-0 
3-502 
18 
25 
240 
848 
114-5 
91 
! 13 74 
4-09 
1 43 
45-9 
3-011 
19 
28 
240 
93-5 
131 4 
98-8 
! 15-15 
4-69 
1-32 
57-8 
2-948 
20 
33-2 
180 
80-3 
111-8 
84-4 
1 17-35 
5 62 
1-515 
79-9 
2-8135 
21 
39 
180 
91 
142-5 
81-8 
j 19 66 
6-78 
1-64 
107 5 
2-656 
22 
46 
180 
100-9 
166-8 
74 
21-80 
7-93 
1-83 
139 9 
2519 
23 
52 
180 
108 
180 
67-5 
23-33 
8-57 
1-95 
lb5-7 
2 496 
24 
58 
240 
151 5 
263-9 
63 5 
25-09 
9-42 
1-97 
219-5 
2-454 
25 
66 
240 
169-7 
297 
58 
27-49 
10-60 
2-14 
258-8 
2-391 
26 
75 
240 
184 
332-3 
53-6 
29-81 
11-51 
2-20 
323-4 
)) 
2-400 
