30 
Mr. Christie on the effects of temperature on 
2. Table of the decrements in the Azimuths of the Points of Equili- 
brium corresponding to an increment of 1° in the Temperature 
of the Magnets, with their several orders of differences^ calculated 
at intervals of^O' in the Azimuths from 77° to 86° : the distances 
of the centres of the Magnets from the centre of the Needle being 
21.21 inches. 
<p 
A (p 
A*(p 
Al (p 
A*<p 
A^ p 
o / 
77 oo 
30 
78 00 
30 
79 00 
30 
80 00 
30 
81 00 
30 
82 00 
30 
83 00 
30 
84 00 
30 
85 00 
30 
86 00 
25.675 
26.565 
27.528 
28.575 
29.717 
30.967 
32 - 339 
33- 849 
35 * 5^7 
37-367 
39*430 
41*745 
44*355 
47*313 
50.690 
54*575 
59*077 
64-332 
70.522 
/ 
0.890 
0.963 
1*047 
1 . 142 
1.250 
1*372 
1 .510 
1.668 
1.850 
2.063 
2- 315 
2.610 
2.958 
3 - 377 
3.885 
4.502 
5-255 
6.190 
/ 
0.073 
0.084 
0.095 
0. 108 
0.122 
0.138 
0.158 
0.182 
0.213 
0.252 
0-295 
0.348 
' 0.419 
0.508 
0.617 
0-753 
0.935 
! 
0.011 
0.01 1 
0.013 
0.014 
0.016 
0.020 
0.024 
0.031 
0.030 
0.043 
0.053 
0.071 
0.089 
0.109 
0.136 
0.182 
/ 
0.000 
0.002 
0.001 
0.002 
0.004 
0.004 
0.007 
0.008 
0.004 
0.010 
0.018 
0.018 
0.020 
0.027 
0.046 
By means of the values of A (p and their several orders of 
differences, contained in these tables, interpolating in the 
usual manner, I calculated the following tables. 
