342 Mr, Christie’s theory of the 
revolution. The greatest east and west deviations, the times 
at which they occurred, and the times at which the needle 
passed zero, were alone in this instance determined in the 
several cases. The results are contained in the following 
table. 
Height of the 
needle’s centre. 
Angle between 
the poles. 
Minimum East. 
Maximum East. 
Zero. 
Maximum West. 
Zero. 
2 d Maximum East. 
Time. 
Deviation. 
Time. 
Deviation. 
Time. 
Time. 
Deviation. 
Time. 
Time, 
Deviation. 
Lat. 64° 28' N; 
var. 36° 24' E, as 
at F* Enterprise, 
1821. 
Inches. 
0 
130 
170 
130 
170 
130 
170 
The mininum 
does not occur 
here. 
10 30 A.M. 
10 20 
10 30 
10 30 
10 30 
10 30 
0 / 
6 00 E 
6 IS 
9 20 
9 25 
12 ,00 
12 45 
h, m. 
I 3 sP.M. 
I 55 
I 40 
I s6 
I 35 
I 55 
h. m. 
S 40P.M 
8 IS 
5 40 
8 20 
5 40 
8 00 
0 / 
5 55 W 
5 00 
8 20 
6 40 
II 20 
9 IS 
h. m. 
II 40P. M 
I 34 A.M. 
II 38P.M. 
I 34 A.M. 
II 4 S P. M. 
I 34 A.M. 
The minimum 
does not occur 
here. 
Lat. 51® 30'N; 
var. 290 W, as in 
London, 1759. 
.oj 
130 
170 
130 
170 
* 3 ° 
170 
h. m. 
3 20 A.M. 
5 00 
3 30 
5 00 
3 30 
5 00 
0 / 
2 20 E 
3 «S 
3 05 
5 00 
4 IS 
6 45 
9 OOA.M. 
9 00 
9 00 
9 00 
9 10 
9 10 
4 30 
4 30 
6 20 
7 30 
9 15 
10 25 
11 os A.M 
11 10 
11 os 
11 08 
11 03 
11 08 
I 40P.M. 
I 30 
I 30 
I 20 
I 20 
I 20 
10 20 
9 50 
IS 30 
14 40 
20 2S 
19 35 
8 osP.M. 
10 24 
8 08 
10 20 
8 os 
10 2S 
h. m. 
10 30 P.M. 
I 30A.M. 
10 40 P.M. 
I 20A.M. 
lo soP.M. 
I 30A.M. 
0 / 
4 10 E 
4 15 
5 50 
6 so 
7 40 
8 40 
Lat. 5 1® 30' N ; 
var. 240 40' W, 
as near London, 
1820. 
10 1 
A 
130 
170 
130 
170 
130 
170 
3 30 
5 20 
3 45 
5 00 
3 JO 
5 00 
2 15 
3 IS 
3 15 
4 45 
6 40 
8 40 
8 40 
8 55 
9 00 
9 00 
9 00 
3 55 
4 00 
6 IS 
6 10 
7 SO 
8 4 S 
10 so 
10 54 
10 so 
10 54 
10 46 
10 S2 
I 30 
I 30 
I 20 
I 20 
I 10 
I 10 
10 35 
10 20 
16 10 
15 20 
21 30 
20 00 
7 S 2 
10 18 
7 so 
10 os 
7 53 
10 07 
10 30 P.M. 
I 20A.M. 
10 30 P.M. 
I 20A.M. 
10 40 P.M. 
I 30A.M. 
4 20 
4 40 
6 10 
6 40 
7 50 
8 35 
Lat. 73° 14' N ; 
var. 124® W. as at 
Port Bowen, 1825. 
,o{ 
130 
170 
130 
170 
130 
170 
The minimum 
does not occur 
here. 
1 
8 00P.M. 
10 00 
8 00 
10 20 
8 10 
10 00 
4 30 
4 30 
6 so 
6 2S 
8 S5 
8 40 
I S3A.M. 
3 12 
I 54 
3 00 
I 54 
3 IS 
10 10A.M. 
10 20 
10 10 
10 10 
10 00 
10 20 
5 05 
5 40 
7 10 
7 45 
9 30 
10 20 
2 46 P.M. 
a 20 
2 44 
3 20 
2 so 
3 25 
The maximum 
does not occur 
here. 
Here the times do not, in any instance, sensibly agree 
more nearly with the observed times at the respective places. 
