4io Mr. Gilpin's Observations on the Variation , 
Table I. 
Observations on the Variation of the magnetic Needle . 
1787 
6 A.M. 
7 A.M. 
8 A.M. 
10 A.M. 
12 M. 
1 P. M. 
2 P.M. 
4 P.M. 
6 P.M. 
8 P.M. 
10 P.M. 
11 P.M. 
O / 
O / 
0 , 
O / 
O / 
O / 
O / 
O / 
O / 
O / 
0 / 
0 » 
Aug. 1 
23 8 
2 3 9 
23 13 
2 3 19 
Ni 
O) 
Os) 
00 
2 3 39 
2 3 39 
23 36 
2 3 2 3 
23 18 
2 3 *7 
2 3 17 
2 
7 
8 
37 
21 
33 
33 
31 
2 4 
19 
19 
18 
*9 
3 
9 
8 
33 
18 
28 
34 
35 
2 4 
39 
18 
19 
37 
4 
1 1 
*3 
12 
18 
31 
33 
31 
2 3 
39 
39 
21 
19 
5 
13 
12 
11 
35 
28 
33 
3 2 
26 
• •• 
... 
39 
20 
6 
11 
10 
12 
37 
26 
33 
33 
27 
21 
21 
21 
20 
7 
10 
1 1 
10 
16 
26 
3 ° 
33 
28 
21 
20 
20 
21 
8 
9 
9 
10 
17 
3 ° 
3 2 
3 2 
29 
21 
21 
39 
21 
9 
31 
33 
12 
1 7 
3 ° 
31 
3 ° 
2 5 
19 
39 
*9 
20 
10 
>3 
12 
"4 
22 
31 
33 
34 
29 
18 
16 
>9 
16 
£ I 
10 
14 
1 1 
20 
3 2 
3 2 
3 2 
26 
35 
3 5 
35 
37 
32 
15 
33 
34 
20 
28 
31 
3 ° 
2 5 
39 
19 
19 
19 
8 
1 1 
10 
1 7 
29 
3 ° 
3 ° 
2 4 
19 
3.9 
39 
39 
34 
10 
IO 
10 
20 
3 ° 
31 
33 
2 3 
19 
18 
37 
16 
*5 
10 
IO 
9 
39 
38 
38 
35 
29 
20 
19 
39 
20 
16 
*3 
34 
12 
21 
33 
35 
33 
2 9 
39 
39 
39 
«9 
17 
8 
7 
9 
18 
29 
3 ° 
3 ° 
2 5 
20 
39 
18 
18 
18 
7 
7 
8 
21 
28 
29 
29 
28 
21 
39 
37 
19 
*9 
8 
8 
9 
20 
S 1 
... 
... 
... 
... 
... 
19 
39 
20 
Zl 
21 
20 
29 
35 
34 
31 
2 7 
39 
39 
21 
20 
21 
21 
20 
21 
29 
34 
33 
3 2 
24 
39 
21 
19 
20 
22 
’3 
33 
34 
17 
27 
29 
29 
2 5 
20 
18 
39 
19 
2 3 
*3 
12 
33 
37 
29 
3 ° 
30 
2 4 
19 
J 7 
18 
18 
24 
1 1 
. 1 1 
33 
1 7 
29 
30 
29 
2 3 
21 
19 
21 
22 
25 
23 
20 
21 
2 5 
33 
31 
3 i 
22 
39 
19 
20 
39 
26 
12 
34 
33 
18 
28 
3 ° 
30 
18 
19 
19 
18 
27 
H 
34 
35 
21 
29 
29 
29 
21 
17 
18 
18 
18 
28 
12 
12 
»3 
18 
2 9 
3 ° 
3 ° 
2 5 
21 
‘39 
21 
29 
34 
14 
21 
3 ° 
3 « 
3 2 
2 5 
18 
18 
18 
18 
3 ° 
12 
1 1 
12 
19 
29 
31 
33 
22 
19 
18 
19 
*7 
31 
! 3 
12 
33 
2 3 
33 
3 » 
3 i 
2 3 
19 
18 
18 
20 
