374 
Mr . Christie on the diurnal deviations oj the 
Tables of the daily changes observed to take place in the points at 
which a JV * eedle was retained in equilibrio by two bar Magnets. 
I. 
The Points of Equilibrium nearly N. 57° TV., N. 40° E., S. 16° TV. • 
the axes of the Magnets slightly inclined to the meridian ; the 
distances from the nearest ends of the Magnets to the centre of the 
Needle, 11,575 inches. Compass No. II. 
May 4. 
Time. 
Points of Equilibrium. 
h. 
6 
m. 
00 
N. 56 
40 w. 
N. 40 
55 E. 
O 
S. ic 
55 W. 
6 
3 ° 
5 6 
20 
40 
10 
16 
>5 
7 
00 
56 
°5 
39 
3 ° 
15 
5 ° 
7 
3 ° 
55 
40 
39 
20 
*5 
50 
8 
00 
56 
20 
39 
35 
>5 
45 
9 
00 
56 
00 
39 
20 
1 6 
0 
:o 
00 
54 
10 
35 
*5 
16 
40 
11 
00 
5 2 
55 
27 
20 
*7 
40 
Noon 
53 
10 
no point 
17 
4 ° 
0 
30 
5 Z 
3 © 
no point 
18 
10 
1 
00 
53 
30 
no point 
'7 
55 
2 
00 
55 
35 
29 
*5 
16 
45 
3 
00 
5 6 
45 
37 
20 
16 
*5 
4 
00 
56 
30 
3 6 
45 
*5 
55 
5 
00 
57 
°5 
3 8 
30 
15 
50 
6 
00 
5 6 
40 
3 8 
10 
«5 
40 
7 
00 
57 
20 
40 
20 
J 5 
20 
Here we see that the westerly and easterly points approach 
and recede from the north together, or that when the deviation 
of the one is minus, that of the other is plus ; that they approach , 
with a slight interruption, betwen seven and eight o'clock, 
until between twelve and one o'clock, after which they re- 
cede, with a slight interruption, about four o'clock, during 
the rest of the day : and that the southerly point recedes from 
the south until between twelve and one o'clock, and approaches 
it during the rest of the day, with similar interruptions. 
