Survey of Northeast Greenland. 215 
stations, snow had unfortunately fallen, whereby the white colour in 
reality on this occasion became a drawback. 
Triangle I—II—IV Triangle I--IV—IX Triangle II—III—IV 
I 81948'38” + 06” I 77230'12” + 09” IL 53°51'12” 10” 
II 54 0950 +05 IV 60 5456 + 00 III 60 1246 +09 
IV 49 0121 +00 IX 41 3434 + 09 IV 65 5628 —07 
179°59'49" + 11” 179°59’42” + 18” 180°00’26” -- 26” 
Triangle IV—IX—XI Triangle III—IV—XI Triangle II—IX —XI 
IV 87°58'46” -- 00” III 58°48’16” + 06” Ш 53°39’00” + 03” 
IX 47 5408 +15 IV 82 5409 —07 IX 43 5534 + 04 
XI 440737 +06 XI 38 1750 --02 ХР 822520 5,08 
180900'21” + 21” 180900'15” = 15” 180900'01” = 01” 
Triangle II— IN —IX Triangle I—III — IX 
И 95928'16” + 01” I 115904'40” + 05” 
III 55 0330 +00 112.27 19057505 
IX 29 2812 +01 IX 37 3600 +05 
179°59'58” + 02” 17905945” + 15” 
Triangle I—II—XI Triangle I-IV--XI 
I 37°14’16” = 04” I 119°02'54”" + 02” 
II 67 1151 --06 IV 27 0340 +00 
XI 75 3406 —03 XI 33 5322 +02 
180900'13” = 13” 179959'56” + 04” 
A glance at the corrections shows how the above-mentioned 
principle has been applied. As it will, however, always be doubtful 
whether the degree of accuracy is really increased by the proceeding 
indicated, it would perhaps have been better, and under all condi- 
tions simpler, if we had distributed the error of the sums of the 
angles in every single triangle, a third to each angle, quite irrespective 
of the possibility that the errors of the different triangles might come 
to clash with each other. As an example may be mentioned that 
the correction in triangle IV—IX—XI would in this manner become 
+ 7” on each angle; in triangle III—IV—XI it would become — 5”, 
whereas in triangle II—IX—XI it would become 0. But the angle XI 
in the latter triangle is the {sum of the two angles XI in the two 
former ones, and it should consequently not have the correction 0 
but + 12”. A discrepancy of this kind is practically of no importance 
in the case of a triangulation so rough as the one in question, as 
long as the form of the triangles is favourable (9: no angle less 
than 30°). 
The computation of the triangle itself is a simple application of 
the sinus-formula for plane triangles. In this place it is therefore 
only to be put forward as an example illustrating a single triangle. 
