160 
Lieut. Foster's observations on the diurnal changes 
North end of Needle to the S. 85 0 W. 
The line of min. daily variation. 
Date. 
Mean 
Time of 
Obser- 
vation. 
A.M. 
or 
P. M. 
Reading of 
north end of 
needle. 
Temp. 
Fabren*. 
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. 
h. m. 
O / 
O 
m. 
S. 
Mar. 2 8 th 
P. M. 
S 86 10W 
— ?n 4 
1 7 
C 7 .r 
it 15 
II C 2 
86 00 
21 
17 
J /o 
58,8 
Mar. 29th 
i 7 
A.M. 
86 10 
— 21 
17 
59>3 
East 
Hazy 
1 52 
86 20 
— 21 

18 
0,5 
Light 
2 12 
86 10 
— 21 
2 50 
86 10 
— 22 
18 
2>3 
3 45 
86 10 
- — 22 
4 12 
86 10 
— 22 
18 
3>5 
5 00 
85 45 
—23 
18 
3.3 
5 3 ° 
84 3 ° 
—23 
„rj 
7 00 
84 S o 
—23 
• • 4 -» • • 
17 
57>5 
7 30 
84 50 
—23 
* * 5jO* * 
18 
4>7 
9 10 
9 4 6 
2 1 
1 8 
0 8 
84 3 ° 
— 21 
„ <L> 
* *rC * * 
17 
57-5 
lion on each side 
10 12 
84 20 
21 
17 
51,2 
Ditto 
Ditto 
side of ©. Max. 
11 5 
85 10 
20 
••h •• 
18 
H ’3 
westerly var. 
1 1 40 
84 40 
— I 9 
0 7 
P.M. 
84 1© 
—i 9 
18 
18 
+ 1 2 
84 00 
— 18| 
17 
46,7 
1 40 
84 00 
—18 
Mnx. easterly var. 
2 15 
84 10 
“171 
17 
48,5 
2 50 
84 40 
— : '71 
3 15 
85 00 
‘71 
17 
48 
3 55 
85 00 
—17 
17 
56,2 
6 00 
85 15 
— l 9 h 
J 7 
55»5 
Easterly 
Clear and 
7 00 
85 30 
— 21 
17 
53 
Light 
fine 
7 30 
85 30 
— 21 
8 00 
85 40 
— 22 

17 
59’3 
8 30 
85 4 ° 
— 22 
8 50 
85 40 
— 22 
— 9 12 
86 30 
— 22 

17 
58,5 
10 14 
86 30 
— 22 
• ••••• 
17 
59>7 
10 46 
86 20 
— 22 
11 20 
86 20 
— 22 
• ••••• 
18 
i ,3 
Midn 1 
86 00 
—22 
18 
2,8 
Northerly 
Clear 
Mar. 30th 
0 8 
A. M. 
85 10 
— 22 
. .-d • . 
North 
Clear 
0 10 
84 25 
— 22 
cd 
Light 
1 20 
84 25 
— 22 
18 
o ,3 
2 35 
82 40 
22 
. ,rC 5 
50 
18 
9>3 
3 10 
82 30 
— 221 
• • • 
18 
14,8 
3 58 
77 30 
— z 3 
<u 
‘•rC " 
18 
3 M 
+ 5 00 
75 00 
— 2 3 1 
* * O ' * 
18 
24,2 
6 00 
78 28 
— 2 3 h 
••H •• 
18 
”*5 
6 IQ 
79 00 
— 2 3 | 
6 40 
78 3 ° 
— 2 3 h 
7 00 
78 00 
— 2 3 l 
18 
1 3,5 
Easterly 
Clear and 
7 '5 
79 00 
— 2 3 s 
Light 
fine 
7 20 
80 00 
— 2 32 
7 3 o 
81 00 
—23 
8 00 
81 00 
— 2 3 
18 
11,4 
