380 
Mr. Christie on the diurnal deviations of the 
V. 
The Points of Equilibrium, nearly N. 80° W. ; N. 80° E. ; S. ; the 
line of the axes of the Magnets coinciding with the meridian ; 
distances 15.95 inches. Compass No. 1. 
Time. 
May 14. 
May 15. 
May 16. 
May 17. 
Points of Equilibrium. 
Points of Equilibrium. 
Points of Equilibrium. 
Points of Equilibrium. 
i h - 
6 
N. 
W. 
N. 
E. 
S. 
E. 
N. W. 
N. E. 
S. 
E. 
N. 
W. 
N. 
E. 
S. 
E. 
N. 
W. 
N. E. 
S. E. 
m. 
oo 
O 
8.3 
/ 
20 
0 
83 
/ 
*4 
0 
1 
ob 
not stable 
0 / 
not stable 
O 
O 
/ 
5 2 
O 
/ 
0 
1 
O 
/ 
O 
75 
36 
0 , 
75 28 
0 / 
0 56 
7 
00 
80 
08 
79 
36 
1 
22 
83 18 
83 26 
0 
42 
77 
5 ° 
77 
34 
0 
46 
74 
28 
74 22 
o 54 
8 
oo 
o° 
>4 
79 
z6 
1 
16 
78 46 
78 36 
0 
44 
76 
00 
76 
16 
0 
52 
73 
48 
73 24 
0 58 
9 
00 
83 
12 
84 
?8 
1 
06 
77 54 
77 24 
0 
34 
77 
42 
77 
52 
1 
22 
73 
52 
73 28 
0 46 
IO 
oo 
81 
46 
80 
18 
0 
S 2 
77 20 
77 52 
0 
40 
77 
12 
77 
20 
1 
°4 
73 
32 
73 24 
0 46 
1 1 
oo 
79 
02 
77 
24 
0 
3 6 
69 18 
73 
36 
73 
18 
0 
54 
73 
06 
72 S 2 
0 40 
Noon 
78 
44 
77 
28 
0 
H 
70 40 
0 
18 
73 
06 
72 
48 
0 
3 ° 
74 
48 
73 44 
0 18 
i 
oo 
78 
52 
78 
32 
0 
18 
7 1 4 ° 
7 ° 34 
0 
18 
73 
32 
72 
5 ° 
0 
22 
74 
10 
73 08 
0 24 
2 
oo 
78 
38 
77 
zo 
0 
34 
69 48 
68 50 
0 
18 
72 
18 
7 i 
52 
0 
24 
72 
06 
7 * 36 
0 14 
3 
oo 
77 
32 
78 
00 
0 
3 b 
7 ° 54 
70 00 
0 
32 
72 
52 
72 
28 
0 
24 
7 i 
40 
71 08 
0 40 
4 
oo 
79 
00 
78 
24 
0 
42 
72 10 
7 i 44 
0 
42 
73 
04 
72 
54 
0 
34 
7 i 
46 
71 02 
0 34 
5 
CO 
81 
18 
81 
°4 
0 
5 6 
73 4° 
72 52 
0 
50 
74 
16 
74 
°4 
0 
34 
73 
06 
72 38 
0 3? 
6 
oo 
83 
1 2 
82 
22 
0 
5 Z 
74 52 
74 20 
0 
42 
75 
10 
75 
°4 
0 
3 ° 
73 
08 
73 06 
0 40 
7 
oo 
87 
08 
88 
34 
0 
5 2 
76 18 
75 08 
0 
40 
— 
75 
20 
74 4 6 
0 38 
8 
oo 
89 
40 
89 
40 
0 
3 6 
78 38 
77 08 
0 
32 
77 
12 
76 30 
0 54 
9 
oo 
not stable 
not stable 
0 
34 
78 00 
77 44 
0 
20 
76 56 
77 
26 
0 
56 
79 
00 
78 50 
0 44 
IO 
oo 
no point 
no point 
0 
34 
77 5 ° 
77 32 
0 
22 
77 
28 
77 
10 
0 
50 
79 
44 
79 3 ° 
0 4: 
In these the westerly and easterly points approach and recede 
from the north together, almost without exception. The 
maximum deviation of the westerly point in the direction minus, 
and of the easterly point in the direction plus , here take place 
between two and three o’clock in the afternoon. The changes 
in the southerly point again agree very nearly with the ob- 
servations in April ; the maximum in the direction minus still 
happening about an hour after noon. 
I have shown, by the observations made on the nth of 
May, that a change in the directions alone of the terrestrial 
