14 6 
Lieut. Foster’s observations on the diurnal changes 
North end of Needle to the West. 
Date. 
Mean 
Time of 
Obser- 
vation. 
A. M. 
or 
P. M. 
Reading of 
north end of 
Needle. 
Temp. 
Fahren*. 
Direction of 
north end of 
needle during 
westerly daily 
variation. 
Time that a ho- 
rizontal needle 
took to make 
60 vibrations. 
Winds. 
Weather. 
Remarks, &c. 
Instr. 
1825 . 
h. id. 
0 
/ 
0 
m. 
S # 
Feb. 27th 
9 3° 
A.M. 
W2 
00 N 
—14 
10 00 
2 
00 
—13 
• •••«••• 
18 
7>5 
10 34 
3 
00 
—14 
11 00 
3 
40 
12 
18 
8,2 
East 
Hazy 
— 11 20 
4 
00 
— 13 
Light 
1 1 46 
3 
40 
— 13 
Noon. 
2 
30 
— 13 
18 
4,0 
0 20 
P. M. 
2 
20 
-—12 
0 30 
2 
20 
12 
1 00 
2 
20 
12 
18 
4>5 
2 00 
2 
00 
“—12 
is 
0,2 
Max. -westerly 
2 IO 
1 
3 ° 
12 
Clear 
2 50 
1 
00 
12 
18 
°>7 
Moderate 
var. 
O on north 
4 3 ° 
0 
5 ° 
— : lz h 
18 
°>5 
mag. merid. 
5 00 
0 
5 ° 
—12 h 
17 
59 
Ditto 
Cloudy 
5 34 
0 
5 ° 
I 2 i 
6 5 
0 
5 ° 
—13 
18 
0,4 
7 10 
0 
40 
—13 
18 
2,6 
Ditto 
Very 
7 55 
0 
40 
— *3 
18 
2,2 
Hazy 
9 3 ° 
0 
3 ° 
—13 
18 
2 
+ 10 5 
0 
20 
— H 
18 
2,4 
Max. easterly 
10 58 
0 
20 
— H 
18 
M 
var. 
11 30 
0 
20 
— * 3 l 
Mid 1 . 
0 
20 
—13 

18 
!>5 
Feb. 28th 
o 15 
A. M- 
0 
3 ° 
—i3| 
18 
1,0 
North 
Cloudy 
1 20 
0 
40 
— J 3 
Moderate 
1 40 
0 
40 
— l 3i 
2 6 
0 
5 ° 
~ l 3k 
18 
2,3 
2 30 
0 
5 ° 
- l 3l 
3 00 
0 
5 ° 
~ l 3l 
18 
I, I 
3 4 ° 
0 
55 
— * 3 | 
18 
1,4 
N. W. 
Hazy 
5 6 
1 
10 
—13 
18 
4 »i 
Moderate 
6 5 
1 
30 
— 13 
18 
5 >° 
7 3 
1 
40 
—13 
18 
5,0 
7 5 ° 
2 
00 
— H 
18 
6,5 
9 00 
3 
25 
—14 
18 
5>4 
G 30 
30 
— 14! 
North 
— 9 4 ° 
3 
40 
—14 
Light 
Fine 
10 15 
3 
40 
— 14 
18 
2,8 
10 45 
3 
3 ° 
—14 
1 1 00 
3 
00 
-14 
18 
i »5 
1 1 25 
3 
00 
-H 
1 1 40 
2 
3 ° 
— H 
1 
Noon 
2 
3 ° 
— H 
18 
°,5 
Max. westerly 
i 00 
P. M. 
1 
3 ° 
—14 
17 
5 6,6 
var. 
1 30 
West 
—14 
2 00 
West 
-14 
1 7 
59,3 
2 20 
West 
— 14 
*-r\ 
N 
+ 
Wo 
OO 
O 
o> 
—15 
17 
OO 
00 
