144 
Lieut. Foster’s observations on the diurnal changes 
North end of Needle to the East. 
Date. 
Mean Time 
of Obser- 
vation, 
A. M. 
or 
P. M. 
Reading of 
north end of 
needle. 
Temp. 
Fahreu 1 . 
Instr. 
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. 
1825 . 
h. m. 
0 1 
O 
m. s. 
Feb. 24th 
IO 50 
P. M. 
Ei 30 
— 26 
17 54>9 
Mod. 
D N. by comp. 
I I 25 
1 30 
— 26 
Midn 1 
1 30 
—26 
1 7 55> 2 
Feb. 25 th 
l 00 
A. M. 
1 40 
— 26 
1 7 55 »5 
N. East ly 
Clear 
Max. easterly 
7 7 n 
1 40 
— 264 
moderate 
variation . 
J 
4 CO 
1 40 
— 26| 
i7 55>3 
4 20 
1 30 
—26| 
5 00 
1 20 
— 26 
17 5 8 > 2 
5 3° 
I IO 
— 2 5l 
5 45 
East 
— 2 5l 
5 5° 
E 3 00 S 
—255 
f\ on 
3 00 
• — 25J 
i7 57,9 
1 Needle gently 
6 7 
2 50 
— 251 
V vibrating in 
w j 
6 4. 
3 00 
— 254 
} small arcs. 
t* 
+ 6 30 
3 IO 
—25 h 
7 00 
3 00 
— 26 
• • • 0 • # • « 
i7 594 
7 3 ° 
3 10 
— 26 
9 45 
3 00 
—261 
17 5 8 > 2 
Max. westerly 
1 1 00 
3 10 
— 26 
17 59> 2 
Easterly 
Clear and 
var. took place 
11 46 
3 00 
26 
light 
fine 
at io h A. M. 
0 15 
P.M. 
3 00 
— 26 
17 5 8 ’9 
1 00 
2 30 
— 26 
17 55>2 
1 20 
2 30 
— 26 
1 30 
2 00 
- 26 
2 00 
1 3° 
—261 
1 7 49’5 
Easterly 
Ditto 
? r 
0 20 
—264 
moderate 
2 IO 
East 
,2 
—261 
2 15 
E 1 40 N 
-261 
3 5 
2 00 
—261 
17 53,6 
4 0 
2 00 
—27 
17 53> 8 
- 5 7 
2 IO 
—27 
17 52,9 
6 5 
2 00 
—2 7 
17 54,5 
7 0 
2 00 
—27 
1 7 55 , 8 
7 4° 
2 00 
—27 
17 56,2 
g 00 
2 00 
—27 
17 54 
9 3° 
2 00 
—27 
10 00 
1 50 
—2 7 
17 54,5 
East 
Hazy 
10 30 
1 40 
—27 
Fresh 
11 00 
1 3° 
—27 
17 54, 8 
Midn 1 
1 30 
—27 
17 54,7 
