Capt. Sabine's observations on the magnetic needle. 135 
Brassa Island , Shetland, lat. 60° 09', long. i° 12' JV. 
In the magnetic meridian. 
Number of 
vibrations. 
Interval. 
Mean 
Time. 
"S 
c ^ 
c O 00 VO'O N 'O 
00 
100 
loo 
m. s 
7 49 ’S 
7 5 ° 
Arc. 
0 
O NvO N NiaN 
N ^ ^ ^ N 
No. of 
vibra- i 
tion. 
00000000000 
— N co io'O t^.00 On O 
100 
7 49>75 
Perpendicular to the meridian. 
Number of 
vibrations. 
Interval. 
Mean 
Time. 
t n 
c ^ ^ 
O N Os NOO CXD N N N N N 
co 
loo 
100 
m. s. 
8 00 
7 59 
j Arc. 
O 
0 N N -rj-oo Q\I^ C^I H 
Os WS N •-H 
No. of 
vibra- 
tions. 
00000000000 
- N n + utnno c^oo On O 
100 
7 59>5 
On an iceberg in Davis’s Strait, lat. 68° 22', long. 53 0 50' IV. 
In the magnetic meridian. 
Number of 
vibrations. 
Interval. 
Mean 
Time. 
CO 
T 3 
= OO 
GJ 
CO 
too 
100 
m. s. 
7 17 
7 z 3 
Arc. 
9 
vrj ON m N « VO N OM^ tJ- 
CO U-, m N N -• —• 
No. of 
vibra- 
tions. 
00000000000 
- h cn 'T l/nno t -^00 ON O 
100 
7 20 
Peipendiculai to the meridian . 
Number of 
vibrations. 
Interval. 
Time. 
CO 
c r^'o 10 10 n 
QJ 
CO 
IOC 
m. s. 
7 33 
Arc. 
O O ^ us N •- VO N CO O tJ- 
Q\NO N h 
No. of 
vibra- 
tions. 
OOOOOOOOOOO 
*-» CS tJ- urs^O t's.oo ON O 
