35° Mr. Christie on the diurnal deviations of the 
As the corresponding observations could not always be 
taken at precisely the same hour, they are put down to the 
nearest half hour : they however were generally taken within 
five or ten minutes of the times specified. In estimating the 
times of the maxima deviations, I take those at which the 
observations were actually made : and for the time of zero, 
I take a proportional time between the nearest observations. 
This notice will apply to the other tables of the deviations. 
From these observations I deduce the following table. 
Table of the greatest Easterly and Westerly Deviations , their times, 
the times of Zero , or no deviation , and the total daily changes in 
the direction of a Needle , whose directive force teas diminished in 
the ratio oflto . 068 , by the action of two bar Magnets placed in 
the line of the Dip : the N end of the Needle pointing North . 
April. 
Max. E. or minus. 
Time of 
Zero. 
Morning. 
Max. W. or plus. 
Time of 
Zero. 
Afternoon. 
Total 
change. 
Value. 
Time. 
Value. 
Time. 
o / 
— I 38 
h. m. 
h. m. 
O / 
+ I 46 
h. m. 
h. m. 
0 / 
6 
8 00 
10 30 
i 45 
6 30 
3 2 4 
7 
— I 16 
7 3° 
10 04 
+ 212 
1 »5 
7 00 
3 28 
8 
— 0 36 
8 00 
9 J 5 
+ 2 50 
0 45 
8 00 
3 26 
9 
IO 
— 0 14 
— I 16 
7 35 
8 30 
9 20 
10 22 
+ 2 32 
+ 2 IO 
0 50 
1 30 
5 15 
2 46 
3 26 
1 1 
— 0 24 
7 10 
7 5 ° 
+ 4 20 
2 00 
6 25 
4 44 
< 2 
— 0 38 
7 3 ° 
8 42 
+ 3 5 6 
1 40 
7 00 
4 34 
Mean 
— 052 
7 45 
9 26 
2 49 
1 24 
6 40 
3 4 1 
During the time that I was making these observations, and 
likewise all the subsequent ones, I noted the general charac- 
ters of the weather, but as I neglected to observe the states 
of the thermometer and barometer, such loose observations 
would, to others, be of little use, and I therefore omit them, 
although at the time they served to convince me that the 
