Mr , Gilpin's Observations on the Variation , 
Table I. 
Observations on the Variation of the magnetic Needle. 
1787 
7 A.M. 
8 A.M. 
10A.M. 
12 M. 
1 P.M 
2 P. M. 
4P.M. 
6 P.M 
8 P.M. 
10P.M 
11 P.M. 
12P.M. 
O t 
0 / 
9 / 
O / 
O / 
O / 
O / 
0 / 
O / 
0 » 
0 , 
0 / 
Feb. 1 
23 13 
23 12 
23 is 
23 21 
23 23 
23 23 
23 21 
23 20 
23 ... 
23 17 
23 ... 
23 17 
2 
16 
16 
l 7 
20 
20 
20 
21 
19 
19 
18 
• • 9 
• 9 * 
3 
16 
16 
21 
22 
24 
25 
3 i 
27 
19 
14 
14 
• •• 
4 
16 
16 
19 
2S 
26 
26 
23 
18 
16 
16 
• • • 
5 
16 
16 
l 7 
22 
Z S 
25 
24 
18 
16 
H 
14 
... 
6 
H 
H 
16 
2 3 
23 
24 
23 
21 
16 
10 
• • • 
7 
... 
16 
18 
27 
26 
24 
24 
17 
16 
10 
9 
8 
• •• 
17 
16 
21 
25 
25 
20 
16 
• •• 
>4 
... 
9 
»4 
l 3 
IS 
23 
23 
23 
23 
21 
17 
16 
... 
16 
10 
17 
1 7 
18 
22 
25 
25 
22 
17 
15 
1 1 
I I 
13 
S I 
1 3 
H 
IS 
23 
27 
26 
21 
IS 
1 1 
10 
IO 
12 
J 5 
16 
14 
23 
22 
23 
21 
19 
18 
16 
l6 
>3 
12 
16 
25 
2 S 
23 
20 
16 
13 
12 
12 
H 
1 i 
1 1 
14 
22 
23 
23 
20 
... 
• •• 
• • • 
»S 
13 
15 
17 
24 
3 i 
3 ° 
28 
20 
... 
10 
... 
l6 
• •» 
16 
17 
24 
25 
25 
23 
21 
18 
17 
• 9 • 
1 7 
« • • 
28 
28 
28 
23 
28 
20 
|8 
... 
17 
... 
s8 
• • • 
16 
17 
22 
24 
24 
24 
19 
16 
16 
l6 
19 
9 
9 
9 
20 
22 
22 
21 
IS 
16 
IS 
20 
... 
12 
12 
2 S 
27 
28 
29 
20 
IS 
10 
21 
• • • 
21 
23 
26 
26 
26 
25 
• •• 
16 
13 
12 
22 
12 
1 1 
19 
21 
24 
23 
23 
l6 
• « 9 
... 
... 
... 
23 
15 
J 5 
21 
... 
... 
3 i 
29 
• • • 
1 1 
10 
IO 
... 
24 
14 
*4 
17 
23 
26 
29 
25 
18 
J 4 
J 3 
13 
25 
13 
*3 
IS 
28 
19 
3 ® 
29 
25 
... 
23 
... 
... 
26 
23 
23 
23 
24 
24 
23 
• • 9 
19 
16 
12 
12 
,,, 
27 
12 
12 
17 
24 
25 
26 
24 
l8 
14 
12 
... 
... 
28 
14 
>3 
14 
21 
22 
22 
15 
9 
14 
13 
