amount of the dip of the magnetic needle , in London , &c. 15 
Exp. 3 , Sept. 7 , with a dipping needle (No. 3 .) made by Mr. Dollond, the 
arms of which were conical, having at their common base a small cube per- 
forated to receive the axis ; the cylindrical terminations of the axis were 
similar to those of Meyer’s needle, very slender, and very carefully turned. 
In the meridian. 
1 
2 
— A.- 
3 
4 
_w_ 
Oscill. 
Arc. 
Time. 
Int 
Arc. 
Time. Int. 
f 
Arc. 
Time. Int. 
Arc. 
Time. 
Int, 
O 
m 
s 
O 
m 
S 
0 
m 
s 
0 
m 
s 
O 
28 
0 
00 
s 
27 
0 
00 
S 
27 
0 
00 S 
28 
0 
00 
s 
37 
38 
38 
37.5 
37 
IO 
23 
0 
37 
38 
22 
0 
21 
0 
37.5 
23 
0 
37 
37 
37 
37 
20 
19 
1 
•5 
*9 
1 
l 5 
16 
1 
14.5 
18 
1 
h 
37 
37 
37.5 
37 
30 
16 
1 
5 Z 
l6 
1 
52 
H 
1 
52 
J 5 
I 
5' 
37 
37>5 
37.5 
38 
40 
*4 
2 
29 
H 
2 
29,5 
1 1 
2 
2 9.5 
«3 
2 
29 
06 
37 
37^5 
37 
37 
50 
12 
3 
12 
3 
°7 
8 
3 
06,5 
10 
3 
06 
60 
37 
37 
37 
37 
10 
3 
43 
IO 
3 
44 
36,5 
6 
3 
43.5 
8 
3 
43 
8 
37 
8 
37 
37 
70 
4 
20 
4 
20,5 
4 
4 
20,5 
6 
4 
20 
70 Oscillations 
in 
260 
260,5 
260,5 
260 secor 
M — 260,25. 
Perpendicular to the meridian. 
Oscill. 
1 
A 
2 
_-A. 
3 
-A 
4 
A 
Arc. 
Time. 
*> 
Int. 
C 
Arc. 
Time. 
1 
Int. 
1 
Arc. 
Time. 
1 
Int. 
< — 
Arc. 
Time- 
> 
Int. 
O 
m 
s 
0 
m 
s 
0 
m 
S 
O 
m s 
O 
30 
0 
00 
s 
27 
0 
CO 
s 
27 
0 
00 
s 
28 
0 
00 
s 
39>5 
39 
04 
00 
O'! 
39 
IO 
27 
0 
39.5 
38,5 
22 
0 
39 
23 
0 
00 
24 
0 
39 
18 
18 
39 
39 
39 
20 
22 
1 
17 
1 
l 9 
1 
l 7 > 5 
21 
1 
18 
39 
56 
38 
38.5 
38 
30 
*9 
1 
57 
38 
M 
1 
16 
1 
5 6 
17 
1 
5 6 
40 
39 
38,5 
38 
J 5 
2 
35 
12 
2 
35 
38 
H 
2 
34.5 
«5 
2 
34 
5 ° 
37 
8 
38 
38 
1 1 
3 
12 
38 
3 
13 
1 1 
3 
12,5 
12 
3 
12 
37 
38 
38 
60 
9 
3 
50 
38,5 
6 
3 
50 
38 
9 
3 
5°>5 
10 
3 
5 ° 
28,5 
28 
38 
38.5 
70 
6 
4 
4 
4 
7 
4 
28,5 
8 
4 
OO 
N 
70 Oscillations i 
in 
268,5 
268 
268,5 
268,5 second 
P 268,38. 
M 260,25 __ 94033 sine of 7o°o6',5 N. dip. 
P 2 268,38* - — 
