120 Prof. Hansteen on the Number and Situation 
nation in some places between 11° and 12°, and in others” 
about 20°. Capt. Buchan and Lieut. Franklin found the de- 
clination in the discovery ships Dorothea ‘and Trent, in the 
year 1818, in. most places near Spitzbergen about 24°. If 
we draw on these places in the chart arrows forming the 
above-mentioned angles. with the meridian, their continuation 
will not go through the point which we found above at 19° 43! 
from the pole, and 259° 58! E. of Greenwich. The same will 
be the case with the extension of the arrows that may be drawn 
in the northernmost parts of Behring’s Straits and in north- 
eastern Siberia. By this we are led to the supposition that 
there must be somewhere in the Siberian Ocean a magnetic 
pole which attracts the northern pole of the needle,—in the sea 
between Spitzbergen and Norway, towards the east, and in 
eastern Siberia and Behring’s Straits, towards the west. 
The following observations may serve to determine the po- 
sition of this point of attraction *. 
Place of Observation. f f Variation. 
° 
= 
Casan.... 
Katharinenburg 
aves 
{ 
Tobolsk *. a ff 
| 
SoH 
Arrow ce 
bw 
Jakutskoi. . 2... 
Ustkameno-gorskaio 
Barnaul!'.. 6 <5 
Pete os cael 
Tata tyrdre, w0) &)% 
Tomsk eee! pei > 
Nizni Udinsk. . . | 
Irkntske'S S34 
eal 
cl slelsk-b-b-olelelole 
> 
CSW AD  —/H Ww TH HATO MO WO 
69 69 
NOoOonNDONDTOANS 
be bet be 
Thence we see that the western declination entirely disap- 
peared in 1805, before we arrive at Casan; from Casan to 
* The observations for the year ]805 are by the counsellor of state Schu- 
bert, and are found in Bode’s Astron. Jahrb. 1309: the others are by dif- 
ferent literati who resided in various parts of Siberia in order to observe 
the transit of Venus through the Sun in the years 1761] and 1769, and are 
given in Bode’s Jahrbuche for 1779.—H. 
Tobolsk 
