310 I. P. Kocu. 
Annekssoen (annex lake) performed during the hand sledge trip to 
Dronning Louises Land in May 1908. Here a base line bc — 190.43 m 
was measured by means of the measuring tape. In a triangle abc 
this length was transferred to the sides ab and ac, by means of 
measuring at all the three points. The objects — tent poles — were 
only pointed once, and only one vernier was used. The result was 
9 o ' 
ur 20 — | According to this ab is computed = 474m 
BAND hoger 98 37 Pr ASE 1" RBG eS 
ET pe Me Pk 60 51 J 
Sum total 180°02’ 
The circumstance that the error in the sum of the angle is so 
smail, is not accidental, but is explained by the fact that the instru- 
ment was very carefully centred, by means of the plumb, above the 
hole in the snow indicating the position of the temporarjly removed 
tent pole. 
When, as in the example quoted, one permits oneself the facility 
of only pointing the objects once, one commits an error, in conse- 
quence of the eccentricity of the telescope and the unequal lengths 
of the sides of the triangles. An estimate will, however, prove that 
the error is in this case without any practical importance. (The 
eccentricity of the telescope — about 4 cm). 
It is evident that with a base of a few hundred metres one can 
only establish points within a distance of a few kilometres. A distance 
of twenty times the length of the base ought to be a limit which 
should not be exceeded. 
On hand sledge trips the length of the march seldom exceeds 
15 kilometres a day. If one is here so careful as to mark off one’s 
stations — or an accurately determined point in the neigbourhood. 
of the station — with an easily visible cairn, one will, as a rule, be 
able to establish quite a solid connection between the stations, and 
the use of the horizontal base may then lead to a result, which is 
both more reliable and fuller than the one to be got through a 
vertical base. 
Notes made during the journey. 
On the journeys made with dog sledges, where the marches 
often exceeded 40 kilometres a day, and where in a few cases we 
might cover more than twice that distance in the course of a single 
day, it could not be avoided that the observation stations now and 
then came to be so far removed and were so badly situated in 
relation to one another, that certain errors in the map were un- 
