THB! CONSTANTS OF THE CUP ANEMOMETER, 
811 
The confusion of the summits of the curves (where the curvature is most influenced 
by y) may account for this. 
(40.) The near equality of /3 and y for Nos. I. and III. seems to show that in these 
two anemometers they are nearly proportional to a. There should be a little excess 
in the first on account of the greater resistance of the arms, which are nearly twice as 
long, and instead of being (as they should be in working anemometers) of thin plates 
with sharp edges, are of ^-inch tube. This must increase both /3 and y in No. I. more 
than in No. III. Still the difference can be but very small, and I think that 
probably the mean values of them will satisfy both sets, within the limit of error of 
observation. 
This may be tried by computing V' by equation (III.) with the x and 2 deduced from 
their mean. We have on this assumption a;=l‘1282 ; z=l , 3400. 
AV' the observed — the calculated V' is given in Table XV. 
Table XV. 
No. 
AV'. 
1 
— 0T8 
2 
+ 0-93 
3 
+ 0-77 
4 
+ 1-28 
5 
+ 1-45 
6 
+ 1-34 
7 
+ 1-25 
8 
+ 1-04 
9 
+ 1T2 
10 
+ 0-25 
11 
-0-23 
12 
-0-27 
13 
+ 0-55 
14 
+ 0-08 
15 
-0-38 
16 
-0-29 
17 
+ 0T1 
18 
+ 0*04 
19 
+ 0-37 
20 
+ 0-47 
21 
+ 0-23 
22 
-0-29 
23 
-0-34 
24 
-0-61 
25 
-0'94 
26 
-075 
27 
-0-64 
28 
-0-65 
29 
-0-49 
30 
+ 0-01 
31 
+ 1-30 
32 
— 0T2 
33 
-0-02 
No. 
AV'. 
34 
+ 0*33 
35 
-0-32 
36 
-0-22 
37 
-0-42 
38 
+ 0-06 
39 
-0-03 
40 
+ 0-30 
41 
-0-25 
42 
-0-44 
43 
+ 0T5 
44 
-0-72 
45 
-0-28 
46 
-0-90 
47 
-0-83 
48 
+ 0-25 
49 
+ 0-26 
50 
+ 0-36 
51 
+ 0-52 
52 
+ 016 
53 
+ 0T5 
54 
+ 0-50 
55 
-o-io 
56 
+ 0-02 
57 
+ 1-05 
58 
+ 0-94 
59 
+ 0-24 
60 
+ 0-15 
61 
+ 0-23 
62 
-0-07 
63 
-0-38 
64 
+ 0T0 
No. 
AV'. 
65 
-1-26 
66 
+ 0-23 
67 
+ 0-65 
68 
+ 041 
69 
+ 043 
70 
+ 0-07 
71 
+ 0-03 
72 
-048 
73 
-T79 
74 
+ 1-44 
75 
-147 
76 
-0-34 
77 
-1-08 
78 
-1-25 
79 
-143 
80 
+ 0-43 
81 
+ 1-01 
82 
+ 140 
83 
+ 1-07 
84 
+ 0-99 
85 
+ 0-67 
86 
+ 047 
87 
+ 0-26 
88 
-0-46 
89 
+ 0-34 
90 
+ 0-39 
91 
-0-22 
92 
+ 0-80 
93 
+ 141 
94 
+ 149 
95 
+ 1-20 
96 
+ 041 
No. 
AV'. 
97 
+ 0-40 
98 
+ 0-66 
99 
+ 0-42 
100 
+ 1-47 
101 
+ 1-55 
102 
-0-45 
103 
-040 
104 
+ 1-67 
105 
+ 041 
106 
+ 0-05 
107 
+ 1-82 
108 
+ 2-38 
109 
+ 2-24 
110 
+ 1-82 
111 
+ 1-61 
112 
+ 140 
113 
+ 2*b0 
114 
+ 2-52 
115 
+ 2-29 
116 
+ 242 
117 
+ 141 
118 
+ 3‘45 
119 
+ 2-79 
120 
+ 2-77 
121 
+ 2-41 
122 
+ 2‘86 
123 
+ 2-94 
