Survey of Northeast Greenland. 299 
The computation will later on be dealt with briefly. In this 
place I shall only add a few remarks to the observations from 
Station K Ш. 
The zenith distance measuring (the levelling) is, as far as the 
hill tops are concerned, to serve for the computation of the altitude ; 
the latter, however, can only be done, when the distance to the top 
can be determined, which as a rule is only possible in case one 
succeeds in pointing the same top from another station. As far as 
the points on the coast are concerned, the zenith distances serve for 
the computation of the distances on the basis of the altitude of the 
station; as for this fuller particulars below. The zenith distance is 
here, where 4z — 0, equal to 360° — the reading (the angle of de- 
pression equal to 270° — the reading). 
The readings of the compass were performed on the boussole 
belonging to the instrument set up during the observation. The 
object of the three readings was partly to test the boussole, partly 
to gain a fair idea of the variation. 
After the termination of the observation point 2a, the cairn on 
Rosio was once more sighted in order to test the unvaried position 
of the instrument. 
By the sighting at point 2a (Station KI) the two stations KI 
and К Ш are connected by means of the azimuth. The altitude of 
Station KI was 23 m (on the map rounded off to 20). Through the 
vertical angle at KI one thus gets the means of controlling the 
altitude of the telescope at KIII. The angle of depression at 2a is 
0°36'; the distance between the two stations is measured on the map 
at 15100 m. The checking computation on the altitude of the telescope 
at KII is as follows: 
The altıtude of point 23.27 2.80. 02 23m 
1310 Lam 053 5 at RS PRE Patel Aa + 157 - 
Refraction and curvature of the earth ..... — 14- 
The altitude of the telescope at KIII.. 166 m 
If the altitude of the telescope above the standing place at К Ш 
is estimated at 1,2 т. the altitude of the station К Ш becomes equal 
to 165 m, which corresponds particularly well with the barometric 
observation (see p. 303). 
The measuring of distances. 
Vertical base. 
In the geographical survey of a stretch of coast, where one of 
the principal objects must be the establishing of the coast line itself, 
