158 
Lieut. Foster's observations on the diurnal changes 
North end of needle to the S 85° W. The line of min. daily variation. 
Date. 
1825. 
Mar. 26th 
Mar. 27th 
Mean 
Time of 
Obser- 
vation. 
A.M. 
or 
P. M. 
Reading of 
north end of 
needle. 
Temp. 
Fahren 4 . 
Direction of 
north end of 
needle during 
westerly daily 
variation. 
Time that a ho- 
rizontal needle 
took to make 
60 vibrations. 
Winds. 
Weather. 
Instr. 
h. m. 
0 
m. s. 
i 55 
P.M. 
S 85 00W 
—24 
17 54,9 
2 45 
• 
— 2 3 l 
17 55,7 
3 ‘5 
. 
—235 
3 5 ° 
— 2 3 l 
17 5 6 >7 
4 5 ° 
~ 2 32 
17 54,3 
6 00 
— 26 
17 5<i’9 
6 50 
— 26 
17 56,2 
7 3 6 
— 26 
c 
8 30 
— 26! 
17 57 
9 00 
— 26£ 
17 57,5 
10 00 
— z 6 \ 
17 56,3 
1 1 00 
—27 
17 57,8 
u 50 
—27 
17 58,3 
1 7 
A. M. 
—261 
«7 57>7 
N. W. 
Hazy 
1 50 
— 26 
17 58,2 
Fresh 
2 15 
— 26 
3 00 
— 26 

17 59, 7 
4 00 
. . a • . 
■ — 26 
. . 42 . . 
*7 5 9 ’4 
4 5 ° 
.2 
—27 
• • ,<u • . 
18 z,o 
Squally 
6 00 
0 
■ — 26 
• • (L> • • 
18 3,2 
7 00 
c 
— 26 
.. g .. 
18 3*7 
7 4 ° 
• - 3 • • 
— 26 
* • g ° ° 
18 5,0 
9 00 
4 -> 
• • Q_, 
— 24 
*s 
10 00 
0) 
• • cj 
— 24 
•• •• 
00 
IO 2 C 
—24 
I I 2 
Oh 
. . Q 
—23 
° 
# * (L) 
17 59 
11 30 
•• £ 
—23 
a 
Noon 
— 21J 
. . t -4 . . 
17 58,8 
North 
0 
0 
P. M. 
— 2 2i 
Mod. 
Hazy 
I IO 
2 2 
17 52,5 
I 50 
— 2 2 
17 52,3 
2 55 
— 2l| 
1 7 57,6 
3 5 ° 
—22 
17 58 
5 15 
— 22| 
J 7 53,3 
North 
5 5 ° 
— 2 2| 
Squally 
6 20 
—221 
*7 54,5 
7 IO 
2 3 
*7 57,4 
7 5 ° 
—23 
J 7 56,7 
9 5 
—23 
17 58,2 
9 50 
—23 
1 7 57,2 
10 50 
—23 
! 7 59,5 
North 
Clear 
11 47 
—23 
17 59,8 
Fresh 
1 00 
A. M. 
—23 
18 1,0 
Hazy 
1 30 
—23 
1 55 
—23 
18 3 
2 45 
—23 
3 5 ° 
—23 
18 4,2 
5 15 
—23 
17 58,9 
5 5 ° 
—23 
18 00 
Ditto 
Clear 
6 20 
2 2 
Remarks, &c. 
Max. easterly var. 
Max. westerly var. 
Max. easterly var. 
