34@ Mr. Christie on the diurnal deviations of the 
which the several deviations from the magnetic meridian, in 
the second and following columns, were observed, and the 
day on which the observations were made is indicated above. 
Observations of the Deviations of a Magnetic Needle having its di- 
rective power diminished by the action of two bar Magnets placed 
in the line of the Dip. 
March 
26 
h. m. 
6 / 
7 00 
8 00 
1 t 
9 00 

1 1 00 
Noon. 
_ __ 
I 00 
4 9 20 
1 30 
4- 10 40 
2 00 
+ 7 4 ° 
4 00 
+ 4 34 
6 co 
+ 2 32 
10 00 
4- 0 04 
27 
o / 
— 2 IO 
-4 40 
4-6 16 
+ 9 20 
o 00 
28 
-4 04 
-2 30 
+ 2 12 
+ 8 20 
+ 9 10 
4-8 10 
+ 7 26 
+ 4 4 ° 
+ 3 3 ° 
2 9 
> - 
o <U , 
U <D 
<D 
C £> <L> 
> rG *2 
t> +•» 1=1 
C/5 ^ 
C 
e O y 
S J o 3 
(U ”2 "O 
X u 
C 
(U 
30 
— I 
— o 
+ 1 
06 
IO 
5 ° 
+ 2 32 
+ 3 10 
+ 2 30 
+ i 06 
4-0 10 
4-0 10 
3 1 
• / 
— o 40 
+ 4 3 ° 
The deviation towards the east before 8 o’clock in the 
morning, and the greatest westerly deviation about 1 o’clock 
afternoon, are here very manifest. 
As it was by the diminution of the directive force that the 
daily variation was rendered thus sensible, the needle pos- 
sessed so little in the first three days observations, that there 
was a considerable degree of indecision about the point at 
which it settled ; and although on the 29th of March I in- 
creased the directive power by placing the magnets at a 
greater distance, at the same time rendering that part of the 
apparatus which supported them more secure, I was by no 
means satisfied with the manner in which the needle came 
home. In consequence of this I made a new needle from 
part of a clock spring, which 1 considered to be excellent 
