Survey of Northeast Greenland. 219 
angle VII—XII—VIII, the value of which angles had already been 
established at the previous computation. 
Given in triangle VIII—IX—XII was thus: 
The angle XII = 69?06'17” 
180° — XII = A+ B = 110°53’43” 
1/2 (A + B) — 55?26'52” 
The side VIII—XII = a = 14005.8 m 
The side IX—XII = b = 9209.8 т 
a+b = 23215.6 m 
ab = 4796.0 m. 
From the known formula tan "2 (А + В) = er tan 12 (A+ В) 
was then computed 
А = angle IX == 72°08'49” and 
В = angle VIII = 38°44'55”. 
The value computed of angle IX corresponded, as it appears, 
very well with the value measured; the divergence practically only 
concerned angle VIII, and this harmonized well with the remark in 
the observation journal. The measured bearing VIII—IX was, there- 
fore, condemned, or rather, which came to the same thing, the 
correction + 25” was applied to angle VIII in triangle VIII — IX — XII. 
In the same triangle the correction of angle XII was, by means of 
corrections in triangles treated on an earlier occasion, determined at 
AS UT une 
Triangle V—VIII—XII had already been used in the preceding 
group, and so the corrections in the last two triangles V—IX—XII 
and V—VIII—IX were in all essentials given. 
The computation was first performed without making use of the 
less favourable triangle V—IX—XII; for the side V—IX was found 
as control log V—IX — et After that the double computation 
of the side V—IX was performed through the triangle V—IX—XII, 
in which manner log V—IX = { Е was obtained 
4.21535 : 
The quadrangle V-VII—X— XI. 
Triangle V—VIII—X Triangle VIII—X— XII 
У 5591228” + 06” УШ 52930'25” + 03” 
УШ 93 3851 +06 ХИ 79 4034 +08 
X 31 0814 +15 X A7°4901” 
179059733” + 27" 
At the regulation of the angles it has been taken into con- 
sideration that the measuring of Station X took place, before Cairn X 
