Survey of Northeast Greenland. 211 
The computation of the triangulation net. 
For several reasons, and among other things because the cairns 
were to be used as fixing points when drawing up a minute map of 
the surroundings of Danmarks Havn, we had as early as the winter 
of 1906—07 been obliged to undertake a computation of the then 
existing triangulation net. 
As I had to reckon without assistance, I divided my triangulation 
work into groups of triangles, and finished the single group alto- 
gether, before passing on to the next. The groups were determined 
with a view to the fact that the sides of each triangle had to be 
computed through two sets of triangles, and of these the one set was 
all through to have a favourable form. The few computations, the 
nature of which did not permit of a satisfactory control — as for in- 
stance certain calculations in the observation journal, computations 
of eccentricity and the like — were calculated twice with an interval 
of at least twenty-four hours. 
Eccentricity. At nearly all of the stations it had been ne- 
cessary to perform the measuring of angles from a point lying out- 
side the centre of the station (the axis of the cairn), and conse- 
quently it became necessary, by a short computation, to convey the 
bearings measured to the centre of the station. To be used for this 
purpose the sides of the triangles were at first roughly computed 
with a four-placed table, by means of the angles measured. As 
an example I shall here give the computation of eccentricity in the 
case of a single station. In the 
case of Station V the provisional 
computation of the sides of the 
triangles gave the following values: 
MAROUSSIA 
Side log Side 
АИ er 4.2582 
N | ieee 3.9991 
МЕТ 4.0684 
RR... 4.2144 
LD т. 4.3540 A 
We. 3.9678 / 
—Maroussia.. 3.7225 
ne 
In order to convey the bearing Fig. 27. 
measured, Instr. —V], to the centre 
of the cairn (Varde V, Fig. 27) we had to apply the correction fvı 
determined by: 
