52 
Mr, Christie on the effects of temperature on 
Table of observations, made io the open air, on the Diurnal Changes in the 
positions of the Points of Equilibrium at which a Magnetic Needle 
teas retained by the joint action of Terrestrial Magnetism, and of 
two bar Magnets, having their axes horizontal and in the Magnetic 
Meridian, and their centres at the distance 21.52 inches from the 
centre of the needle. 
Date and Time of 
Observation. 
Temperature of 
the Magnets. 
Points of Equilibrium. 
Temperature of 
the Magnets. 
Mean Tempe- 
rature of the 
Magnets. 
Barom. 
1 Therm. 
1 attached. 
S'orth. 
South. 
West. 
East. 
South. 
North. 
South. 
h. 
m. 
0 
0 
0 
/ 
0 
0 
0 
0 
0 
0 
ti) 
6 
05 
55.2 
54.0 
85 
50 
85 
02 
0 
20 E 
54. 8 
54.0 
54.50 
30. 
23 
58.2 
• 
c 
7 
24 
55.2 
55.2 
85 
18 
84 
24 
0 
20 E 
55.6 
55.6 
55.40 
30- 
23 
57-1 
N 
u 
o 
8 
53 
57-3 
56.7 
85 
32 
83 
38 
0 
06 E 
57-4 
57.0 
57.10 
lO 
30 
No observation. 
o 
05 
61 .8 
60.0 
82 
06 
80 
18 
0 
34W 
61.8 
60.0 
60.90 
30. 
20 
58.2 
I 
26 
62.5 
61 .0 
81 
02 
78 46 
0 
44W 
62.5 
61 .0 
61.75 
30. 
19 
59.8 
o 
2 
56 
63.8 
62,0 
79 
H 
77 
58 
0 
28W 
63.8 
62.0 
62.90 
30. 
19 
60.6 
o \ 
a 
4 
26 
63,0 
61 .0 
80 
00 
78 
58 
0 
20W 
62.8 
6i .0 
61.95 
30. 
18 
59-5 
<D 
6 
IO 
59.0 
58.0 
81 
36 
80 
20 
0 
00 
58.8 
57.8 
58.40 
30. 
18 
56.8 
< 
7 
25 
56.0 
55.0 
83 
08 
82 
06 
0 
06 E 
55.8 
55.0 
55-45 
9 
00 
55 6 
55.8 
82 
34 
81 
30 
0 
12W 
55-3 
55-5 
55-55 
30. 
17 
55-7 
6 
12 
55-7 
55-5 
82 
50 
82 
04 
0 
12 E 
55-5 
55-3 
55-50 
56.75 
Co 
7 
25 
55.2 
54.8 
84 
12 
83 
02 
0 
18E 
55-5 
55-1 
5S-15 
30. 
1 I 
C 
9 
00 
66.25 
64.0 
77 
52 
78 
08 
0 
18E 
66.25 
64.0 
65-13 
30. 
I I 
60.25 
oJ 
Ut 
o 
IO 
27 
68.0 
66.0 
77 
18 
76 
40 
0 
20W 
68.0 
66.0 
67.00 
30. 
I I 
63.0 
13 
o 
12 
71.0 
68.8 
77 
04 
74 
42 
0 
26W 
71.0 
68.8 
69.90 
30. 
09 
^•3 
I 
26 
70.7 
69.0 
75 
24 
74 
20 
0 
38W 
70.7 
69.0 
69.85 
30. 
09 
64.6 
X . 
4 -* 
c 
3 
00 
70.0 
68.4 
75 
20 
74 
02 
0 
32W 
69.8 
68.3 
69.14 
30. 
08 
65. 1 
o 
N 
o 
o 
4 
30 
69.0 
67.5 
75 
16 
74 
28 
0 
16W 
69.0 
67.5 
68.25 
30. 
07 
65.8 
c 
6 
00 
67.6 
66.3 
75 
42 
74 
54 
0 
02W 
67.6 
66.3 
66.95 
30. 
07 
64. 8 
7 
30 
65.8 
64.2 
76 
18 
75 
38 
0 
02W 
65.8 
64.2 
65.00 
30. 
08 
64.0 
< 
9 
00 
61.5 
60. 1 
79 
14 
77 
38 
0 
loW 
61.4 
60.0 
60.73 
30 
09 
60.0 
5 
50 
56.8 
55.0 
81 
46 
81 
28 
0 
26 E 
56.6 
54.8 
55.80 
30 
IO 
60.4 
to 
7 
26 
56*3 
55*7 
81 
46 
81 
20 
0 
22 E 
56.1 
55-7 
55-95 
30 
•13 
57-5 
9 
00 
55-4 
54.8 
82 
48 
82 
54 
0 
08 E 
55-4 
54.8 
55.10 
30 
IS 
57.8 
• 
(-1 
IO 
26 
56.5 
56.0 
82 
48 
82 
36 
0 
06W 
56.7 
56.0 
56-30 
30 
•15 
57-7 
o 
5 
o 
00 
58.6 
58.0 
81 
50 
80 
40 
0 
24W 
58.8 
58.0 
58-35 
30. 
16 
58.5 
3 ^ 
I 
30 
60.0 
58.8 
80 
08 
78 
52 
0 
26W 
60.0 
58.8 
59.40 
30 
16 
58.6 
CO 
a 
3 
00 
60.5 
58.7 
79 
54 
78 
40 
0 
24W 
60.5 
58.7 
59.60 
30. 
17 
58.5 
N 
o 
o 
4 
30 
59-3 
57.6 
79 
IO 
78 
32 
0 
04W 
59-3 
57.6 
58-45 
30 
•17 
57-4 
c 
6 
00 
57*5 
56.0 
79 
38 
79 
04 
0 
o 67 E 
57-4 
55-9 
56.70 
30. 
17 
57.0 
7 
30 
55*5 
54-5 
81 
00 
80 
32 
0 
04 E 
55*5 
54-5 
55.00 
30. 
18 
55-7 
< 
9 
00 
53-9 
53*1 
82 
18 
81 
38 
0 
00 
53*8 
53-0 
53-65 
30. 
20 
55-4 
