156 
Lieut. Foster’s observations on the diurnal changes 
North end of Needle to the S 85 ° W. The line of minimum daily variation. 
The distance of the nearest end of each magnet placed to the South 
, from the centre of the compass- 
box, was, of that attracting the North end of the needle 18,6 inches, and of the other attracting the 
South end of the needle 27,15 inches : under this adjustment, the needle made one vibration in 10,2 
seconds, so that the directive power now 
was to the undiminished force as 
O 
4-3 
CO 
O 
nearly. 
Direction of 
Mean 
A. M. 
Reading of 
Temp. 
north end of 
Time that a ho- 
Date. 
Time of 
or 
north end of 
Fahren 1 . 
needle during 
rizontal needle 
Winds. 
Weather. 
Remarks, &c. 
Obser- 
P. M. 
needle. 
westerly daily 
took to make 
vation. 
Instr. 
variation. 
60 vibrations. 
1825 . 
h. m. 
O 
m. s. 
Mar. 23d 
6 30 
A.M. 
S 8 ^ 30W 
— 26 
18 2 
Max. easterly var. 
7 IO 
8 3 3 ° 
— 26 
l8 2,2 
took place at 
7 3 ° 
8 3 3 ° 
— 26 
2 1 ' 5“ A. M. 
7 55 
83 3 ° 
—26 
l8 1,5 
+ 9 8 
83 20 
— 26 
l8 10,7 
9 3 ° 
83 30 
— 26 
10 10 
83 3 ° 
—23 
0 
00 
10 30 
83 30 
22 
11 18 
83 30 
- — 22 
18 9,3 
u 
CD 
1 1 50 
83 3 ° 
2 I 
-rC! 
4 -* 
0 4 
P. M. 
83 4 ° 
2 1 
18 3 
S 
0 45 
83 5 ° 
20-J- 
<L> qj 
1 5 
84 20 
—(KM 
0 
1 
17 52,8 
2 5 
84 20 
—20 
*7 53 >9 
• .-d t! * • 
Max. westerly var.. 
2 45 
85 00 
—19^ 
c 2 
3 5 
85 00 
— 19J 
17 56,5 
. r-*— 1 
& 
3 2 5 
85 00 
—193 
5 3 
3 55 
85 00 
— .191 
17 58,4 
4 45 
85 5 
—i 9 f 
17 55>6 
s ~ 
5 20 
85 00 
. — 2 1 
0 
6 00 
85 00 
— 22 
l 7 5°>5 
6 20 
85 00 
—23 
7 00 
85 10 
—23 s- 
18 1,8 
7 35 
85 20 
—24 
7 55 
85 20 
—24 
1 7 5 6 >7 
9 00 
86 00 
—24 
18 0,2 
— 9 15 
86 20 
—24 
9 4 ° 
86 00 
—24 
17 58.5 
1 1 00 
86 15 
—25 
17 59 
Midn r 
85 5 ° 
— z 6 \ 
*7 59 
Mar. 24th 
1 00 
A.M. 
85 4° 
—26| 
18 00,8 
1 30 
84 40 
—2 6 \ 
Calm 
Clear and 
Max. easterly var. 
2 00 
85 00 
—2 7 
. . H 3 . . 
N 
DO 
fine 
2 30 
85 00 
—27 
ci 
2 40 
84 00 
—27 
4 -J 
2 50 
83 5 ° 
— zO\ 
4 = 
• * bO • • 
18 2,5 
Easterly 
3 20 
83 40 
—27 
Light 
Ditto 
3 55 
83 4 ° 
—27 
<D 
• • • • 
12 4,1 
6 00 
83 40 
—27 
4 -» 
18 5,8 
6 57 
83 50 
—27 
.. h •• 
1 7 54 .7 
Calm 
Clear and 
fine 
