Lieut. Foster’s observations on the diurnal changes 
140 
North end of Needle to the South. 
Date. 
Mean 
Time of 
Obser- 
vation. 
A. M. 
or 
Reading of 
north end of 
Temp. 
Fahren 1 . 
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. 
P. M. 
needle. 
Instr. 
1825 . 
Feb. 20 th 
h. m. 
Noon 
0 7 
0 30 
P.M. 
S 2 50 E 
2 OO 
2 OO 
0 
—28 
— 28 
-—28 
- 0 
* ” -6 ' • 
a 
<rS 
-C 
<a 
m. s. 
17 5 8 >3 
*7 53’7 
1 7 S°>3 
l 7 So, 5 
*7 57>2 
*7 54^5 
>7 53.8 
*7 54 
17 54.7 
! 7 57.5 
17 55.6 
17 57.2 
»7 59.4 
*7 S4>3 
J 7 54.7 
*7 57.7 
18 0,5 
NortherF 
Light 
Clear anc 
fine 
Max. westerly 
variation. 
1 22 
2 00 
+ 25 
2 10 
2 20 
2 55 
3 20 
3 35 
3 5 2 
c 8 
I JO 
South 
S 0 20 W 
0 30 
South 
S 0 10 W 
0 10 
-27 
— 28 
— 28 
— 28 
—28 
28 
jj 
0 
rC 
• • O • • 
0 10 
S 3 00 E 
3 4° 
3 5° 
3 5o 
3 40 
3 30 
3 4° 
3 40 
3 4° 
3 4° 
3 30 
3 4° 
3 4° 
3 4o 
3 4° 
3 4° 
3 49 
3 4° 
7 40 
—28 
—28 
—28 
-281 
-29 
- 2 9h 
- 2 9i 
-30 
— 2 9 
—3° 
— 3 1 
—3° 
— 3° 
— 3° 
—3° 
—3° 
—30 
-30 
-3° 
-3! 
— 3 1 
-3i 
—31 
— 3 1 
— 3 1 
— 3 1 
-3i 
— 3 2 
— 3 2 
— 3 2 
— 3 2 
— 3 2 
— 3 2 
— 3 2 
72 
6 00 
7 IO 
7 40 
Ditto 
Ditto 
9 3 
9 5° 
1 1 00 
1 1 50 
0 35 
1 00 
1 30 
2 00 
2 30 
3 00 
3 3 ° 
4 00 
4 20 
5 5 
5 3 ° 
6 00 
Max. easterly 
variation. 
Feb. 21st 
A. M. 
J ery little motion, • 
and that to the • 
right hand. 
» • e • * # 
Northerly 
Light 
N. west- 
erly 
Calm 
Clear and 
fine 
3 T - 
•2 40 
18 9,2 
18 3.5 
17 59. 1 
i7 57.5 
17 58.5 
18 4,5 
17 51,8 
>7 50.7 
17 49,8 
3 5 ° 
3 5° 
3 5° 
6 28 
Max. Westerly 
variation. 
Observed the needle 
oscillate in small 
arcs previous to its 
becoming stationary 
from 10 “ 20 m to 1 ‘- 
P. M. 
7 35 
7 5 2 
9 3° 
10 00 
-fio 20 
1 1 00 
11 30 
Noon 
0 30 
1 no 
P. M. 
3 5 ° 
3 4 ° 
3 3 ° 
5 20 
2 50 
2 50 
2 55 
2 50 
2 50 
2 50 
3 00 
3 10 
2 20 
3 3 ° 
3 5 ° 
4= 
• . . . 
<L> 
<D 
• • •£ • • 
0 
.. H .. 
Calm 
Clear and 
fine 
I 30 
1 40 
2 OO 
J 
Parhelion on each 
— 3 2 
— 3 2 
— 3 2 
-30 
17 5°.9 
17 54 . 1 
side of sun. Needle 
gently oscillating in 
very small arcs. 
2 30 
3 6 
