72 
Lieutenant Foster’s observations , &c . 
Observations on the daily variation of the magnetic needle at the Whale Fish Islands, June 1824. Variation 70° 2' W. 
June 29th. 
Instrument adjusted when 0 was on mag 1 , meridian. 
Temperature. 
Baro- 
meter. 
Inst. 
Air. 
+ 
+ 
O 
0 
inches. 
49 
45 
55 
45 
30,00 
56 ! 
45 
56 * 
45 
57 
45 
56 
47 
56 
47 
30,02 
57 
47 
58 
46 
6 5 
45 
57 
44 
56 
42 
57 
4 i 
30,00 
56 
4 i 
47 
40 
45 l 
40 
June 30th. 
Instrument re-adjusted when © was on mag 4 , meridian. 
Apparent 
Time of Ob- 
servation. 
h. m. 
A. M. 7 35 
10 10 
11 10 
P.M.I2 10 
1 
2 
3 
4 
5 
6 
10 
10 
10 
10 
10 
47 
7 10 
8 10 
9 10 
10 10 
1 1 
Mid 4 i2 
Reading of 
south end 
of needle. 
14 OO 
20 15 
20 15 
22 OO 
29 OO 
23 OO 
1 9 3 ° 
21 00 
21 00 
19 00 
19 00 
19 00 
13 00 
1 7 00 
19 00 
17 00 
Direction of 
south end 
of needle. 
o> js 
co is 
13 
>111 
So S 
3 =3 a 
O <L> 
C/2 
aS'E 
v V O g 
3 613 *, 
o .5 
VI o £ 
OX) 
T 
l c 
5 - 3 
•3 
<D 
V 
<5 
Remarks, 
See. 
O on 
magnetic 
meridian. 
15 max. 
westerly 
variation, 
©west by 
compass 
©on mag. 
meridian. 
Light airs 
and fine 
weather. 
Apparent 
Time of Ob- 
servation. 
h. m. 
A.M.7 30 
10 IO 
1 1 IO 
P.M.I2 10 
1 20 
2 20 
3 10 
4 10 
6 46 
7 10 
8 10 
9 10 
10 10 
1 1 10 
Mid. 12 10 
Temperature. 
Inst. 
+ 
o 
5 2 
53 
53 
53 
53 l 
54 
5 6 
55 
56 J 
54 
49 
49 
46 
43 j 
42 
Air. 
+ 
o 
46 
46 
47 
47 
47 
47 
47 
46 
45 
44 
43 l 
43 
42 
42 
4*1 
Baro- 
meter. 
inches. 
29,94 
29,91 
29,98 
Reading of 
south end 
of needle. 
4 IO 
7 
26 
29 
30 
24 
20 
9 
30 
3 ° 
30 
3 ° 
30 
00 
00 
00 
1 
12 
8 
9 
13 
9 
9 
9 
00 
3 ° 
30 
00 
3 ° 
30 
3 ° 
Direction of 
south end 
of needle. 
Remarks I 
& c. 
> 
t’E 
3 it 5 
§ 33 3 
3^ ° 
1 o W « 
J w g -5 
r" 
Mi . 
jg’S 
> 
"S s 
'■a 
a 
© on 
magnet: 
meridiai 
23 max 
westerl 
variatioi 
©west! 
compass 
Cloudy 
weather 
SSE win 
with rail 
July 1st. 
Apparent 
Time of Ob- 
servation. 
Temperature. 
Baro- 
meter. 
Reading of 
south end 
of needle. 
Direction of 
south end 
of needle. 
Remarks, 
Sec. 
Inst. 
Air. 
h. m. 
A.M.7 3° 
10 30 
I I IO 
P.M.I2 IO 
1 IO 
2 IO 
3 10 
+ 
0 
44 
42 
43 
43 
44 
45 
46 
+ 
0 
4 2 § 
39 
39 
39 
40 
40 
44 
inches. 
2 9>97 
29,98 
Oil l 
4 IO 00 
8 30 
12 30 
10 00 
2 3 3 ° 
8 00 
00 00 
S. end to South end of 
the west- needle drawn 
ward. to the east. 
© on 
mag.mer. 
23' 30 " 
max. W. 
var. 
©west by 
compass. 
Here the observations were interrupted by the re-shipment 
of the instruments preparatory to the departure of the 
expedition. 
From these observations it appears, that the maximum 
westerly variation happened about a quarter past one o’clock 
P. M. at which time the sun was nearly west by compass. 
The observations, however, were not continued after mid- 
night ; consequently the time of maximum easterly could not 
be determined, nor the total amount of the daily variation. 
