36 
Mr. Christie on the effects of temperature on 
III. Table of the increments in the Azimuths of the Points o/Equi^- 
librium corresponding to a decrement ofYin the Temperature of 
the Magnets j calculated at intervals of 6' in the Azimuths from 
from 14: to 82°, and of 2! in those from 82° to 86°; the distances 
of the centres of the Magnets from the centre of the Needle being 
2 1.52 inches : to be applied to the correction of the observed Azi- 
muths when the Observed Temperature of the Magnets is above 
the Mean Temperature to tvhich the observations are to be reduced. 
74 ° 
75 ° 
76° 
77 ° 
/ 
A (p 
Dif. 
A (p 
Dif. 
A p 
Dif. 
A p 
Dif. 
oo 
o6 
12 
i8 
24 
30 
36 
42 
48 
54 
60 
/ 
21 .653 
.771 
.891 
22.012 
.135 
.260 
•387 
.516 
.546 
.679 
• 9 U 
.118 
.120 
. 121 
.123 
.125 
.127 
.129 
• 130 
•133 
•134 
22.913 
23.050 
.188 
•329 
•472 
.617 
.765 
• 914 
24.066 
.221 
•378 
•137 
.138 
.141 
•H 3 
.145 
. 148 
.149 
.152 
• 154 
• 157 
24- 378 
•538 
.700 
.864 
25- 032 
.202 
•375 
•551 
•730 
.912 
26.097 
. 160 
. 162 
. 164 
. 168 
.170 
•»73 
.176 
• 179 
. 182 
.185 
/ 
26.097 
.285 
• 477 
.672 
.870 
27.072 
.278 
.487 
.700 
• 917 
28.138 
.188 
.192 
• 195 
. 198 
.202 
.206 
.209 
.213 
.217 
.221 
<P 
78° 
79 ° 
80® 
81® 
/ 
A (p 
Dif. 
A p 
Dif. 
A P 
Dif. 
A p 
Dif. 
00 
06 
12 
18 
24 
30 
36 
42 
48 
54 
60 
/ 
28. 138 
•363 
.592 
, 826 
29.064 
•307 
•554 
.807 
30.064 
.326 
•594 
.225 
.229 
•<234 
.238 
•243 
.247 
.253 
• 257 
.262 
.268 
30.594 
.867 
31-146 
•431 
.721 
32.018 
.321 
.631 
•948 
33-272 
.603 
•273 
.279 
.285 
. 290 
•297 
.303 
.310 
•317 
•324 
• 33 » 
33-603 
•942 
1 34-388 
1 -643 
35-006 
•377 
•757 
36.147 
• 546 
•956 
37-375 
•339 
•346 
•355 
•363 
•371 
.380 
•390 
•399 
.410 
• 419 
37-375 
. 805 
38.247 
.700 
39- 165 
.642 
40- 133 
.637 
41.155 
.689 
42.238 
•430 
• 442 
•453 
.465 
•477 
• 491 
• 504 
.518 
•534 
•549 
