the intensity of magnetic forces, &c. 
31 
I. Table of the increments in the Azimuths of the Points of Equili^ 
brium corresponding to a decrement of 1® in the Temperature of 
the Magnets, calculated at intervals ofi^’in the Azimuths from 
77° to 86°; the distances of the centres of the magnets from the 
centre of the needle being 21.2 1 inches : to be applied to the cor- 
rection of the observed Azimuths, ichen the Observed Tempera- 
ture of the Magnets is above the Mean Temperature to which the 
observations are to be reduced. 
it 
78° 
if 
80° 
81° 
A 9 
Dif. 
A 9 
Dif. 
A (p 
Dif. 
A <p 
Dif. 
A (p 
Dif. 
/ 
oo 
o 6 
12 
i 8 
24 
30 
3 ^ 
42 
48 
54 
60 
26.455 
.646 
.840 
27.037 
.238 
•443 
.652 
.864 
28.080 
.300 
•523 
.191 
.194 
.197 
. 201 
• 205 
.209 
.212 
.216 
. 220 
• 223 
/ 
28.523 
• 75 ^ 
•983 
29.220 
.461 
• 707 
•957 
30.212 
•473 
•739 
31*011 
.228 
.232 
•237 
.241 
.246 
.250 
•255 
.261 
.266 
.272 
t 
31 .01 I 
.288 
•571 
.859 
32- 154 
•455 
•763 
33- 078 
.400 
.728 
34- 063 
.277 
• 283 
288 
•295 
. 301 
.308 
• 3*5 
. 322 
• 328 
•335 
34- 063 
.406 
•757 
35 - **7 
•485 
.862 
36.248 
•643 
37.048 
.462 
.887 
•343 
• 35 * 
. 360 
.368 
•377 
.386 
•395 
•405 
• 4*4 
.425 
37- 887 
38- 323 
•770 
39- 229 
.700 
40.185 
.683 
41.195 
.722 
42.263 
.820 
•436 
•447 
•459 
• 47 * 
•485 
•498 
.512 
•527 
• 54 * 
•557 
<P 
82° 
83° 
8^ 
850 
. 
A 
Dif. 
A 9 
Dif. 
A cp 
Dif. 
A <p 
Dif. 
/ 
00 
06 
12 
18 
24 
30 
36 
42 
48 
54 
60 
/ 
42.820 
43-394 
43*985 
44.594 
45.223 
45.872 
46.542 
47-233 
47-947 
48.686 
49-450 
•574 
.591 
.609 
.629 
• 649 
.670 
.691 
.714 
•739 
.764 
/ 
49*450 
50.241 
51.061 
'51.912 
'52-795 
; 53 - 7 i 3 
54.668 
'55.662 
'56.696 
' 57-773 
58-895 
.791 
. 820 
.851 
.883 
.918 
•955 
•994 
1.034 
1-077 
1.122 
58.895 
60.068 
61 . 296 
62.584 
63.938 
65.362 
66.861 
68.440 
70. 105 
71 .864 
73-730 
*•*73 
1 .228, 
1 .288 
*•354' 
*•424, 
*• 499 , 
*•579 
1 .665 
*• 759 , 
1.866 
/ 
73-730 
75 - 7*5 
77-835 
80.107 
82.552 
85-193 
88.058 
91.178 
94-589 
98-342 
102.502 
! 
*•985 
2.120 
2-272 
2- 445' 
2.6411 
2.865! 
. 120 
3 - 4 ** 
3-753 
4. 160 
i 
