1063 
THE CONSTANTS OE THE CUP ANEMOMETER, 
Table^XXI. 
No. 
Dir. 
L. Dens. 
Time. 
A. 
A'. 
Log. <p'. 
V. 
v'. 
V. 
V'. 
V'-V. 
I. 
S.W. 
9-97776 
176-1 
74 
51 
1-42156 
3-601 
2-482 
10-291 
10 030 
-0-261 
II. 
S.W. b. s. 
9-97760 
391-8 
569 
511 
1-56164 
12-444 
11-176 
35'255 
32-471 
-2 784 
III. 
S.W. 
9-99124 
353-9 
226 
130 
1-88336 
5-393 
3-102 
15-327 
14-380 
-0-947 
IV. 
E. b. N. 
9-99320 
359-9 
268-3 
170 
2-07307 
6-389 
4-047 
18-137 
18-294 
+ 0-157 
V. 
S.W. b. S. 
9-97684 
334 4 
322-8 
194 
2-25147 
8-271 
4-971 
23-453 
22-606 
-0-847 
VI. 
S.E. b. E. 
9-98104 
278-0 
215-9 
134 
1-97602 
6-659 
4-133 
18-874 
17-512 
-1-302 
VII. 
098132 
330-9 
260 7 
161 
2-21161 
6-749 
4-168 
19-334 
20-397 
+ 1-063 
VTII. 
210-1 
189-5 
114 
2-27685 
7-733 
4-652 
21-932 
22-315 
+ 0-383 
IX. 
S.E. 
9-97757 
237-0 
306-8 
192 
2-50054 
11-092 
6-941 
31-428 
30-812 
-0 616 
X. 
176-1 
234-3 
153 
2-53450 
10-446 
6-835 
29-664 
31-249 
+1"585 
XI. 
197-3 
2136 
152 
2-34007 
9-252 
6-599 
26-228 
27-405 
+ 1-177 
XII. 
154-4 
180 
122 
2-39493 
10-102 
6-772 
28-631 
28-762 
+ 0131 
XIII. 
>> 
131-1 
157-3 
104 
2-41366 
10-285 
6-800 
29-149 
28-994 
-0-155 
XIV. 
N. 
9-98883 
455-3 
369-7 
211 
2-16403 
6 957 
3-970 
19-741 
19-363 
-0-378 
XV. 
S.E. b. S. 
9-97683 
278-6 
231-1 
160 
2-01434 
7-108 
6-920 
20-169 
19-441 
-0-728 
XVI. 
9-96418 
259-9 
204-4 
134 
2-10555 
6-738 
4-417 
19116 
19-570 
+ 0-454 
XVII. 
S. b. E. 
646-9 
639 
512 
2-13691 
8-462 
6-780 
23-994 
25-202 
+ 1-208 
XVIII. 
S. 
9-96469 
414-3 
209 
126 
2-01367 
4-321 
2-605 
12-313 
14-807 
+ 2-494 
XIX. 
S.W. 
9-96609 
684-9 
708-6 
489 
2-26543 
8-867 
6-119 
25-141 
25-293 
+ 0-152 
XX. 
9-96872 
404-6 
310-3 
187 
2-10790 
6-571 
3-960 
18-656 
18-643 
-0-013 
XXI. 
99 
9-95783 
713-5 
477-5 
251-2 
1-90599 
5-734 
3-003 
16-290 
14-523 
-1-767 
These were computed with a;= 1*5920 and s= 1*534; S (V' — V)=—0*994, which 
being divided by S (e — e) = 164*56, we have dx= —0‘0060 ; x— 1*5860; 2=1*515; 
x-jr^/zl =2*826 ; log. 0*45111 ; limit of ^=2*826. 
For K, V=vX 2*831+—. 
v 
It is evident from the values of V — V that the constants do not change with 
v or v \ but that their differences are casual owing to the difference of wind at 
the two instruments. They differ when the v’s are nearly equal: For instance, I. and 
VIII. differ by 2*995; VII. and XIV. by 1*441, and IX. and X. by 2*181; and 
that such differences of wind may exist for some time is shown by Table XX. where 
during the first 321 seconds \'~V= —2*888, and during the following 325 s it 
is — 0*784.* 
The minus values predominate during S.W. winds as might be expected from 
paragraph (56). 
This x and z are larger than those given in paragraph (40), namely, x— 1*2282, 
and 2=1*340, which give for the limit 2*286. 
This difference is due partly to my having then used an «. only two-thirds of what 
I believe to be its real value, partly to the uncertainty of the frictions employed and 
of W, and partly to the defect of the method of minimum squares in such a case. 
* As these instruments are generally constructed to register V==3E, their readings should be corrected 
by subtracting 0'060 of the recorded V. 
