240 I. P. Косн. 
After this comes the computation of the triangle Кар Bremen— 
Haystack —Keferstein Berg. In this triangle the seconds are calculation 
figures, in that the angles at Keferstein Berg and Haystack may be 
encumbered with errors of as much as half a minute. 
The triangle looks as follows: 
Z Haystack—Kap Bremen—Keferstein Berg. . 128°08'56” 
Z Kap Bremen—Keferstein Berg—Haystack.. 32214715” 
Z Keferstein Berg—Haystack—Kap Bremen .. 19°36’49” 
log (Kap Bremen—Haystack) = 4.92202 
log (Keferstein Berg—Haystack) — 5.09059 
Azimuth Kap Bremen—Haystack .... 192°57'32” 
Azimuth Keferstein Berg—Haystack .. 174°25'22” 
Haystack [ ¢ = 75°43'42" 
1820 a) = 19 2242. 
As will appear the computation of the longitude of Haystack in 
1870 agrees with PAYER's value given by Koldewey, ! = 19°23’. 
The drift of North Greenland in a westerly direction. 
The earlier computed values of 1870 and 1907 of the latitude of 
Haystack harmonize better than might be expected; the difference 
is four seconds or about 120 metres. On the other hand the longi- 
tudes harmonize badly, in that the determination of longitude of 
1907 indicates the position of Haystack as 2’36” or about 1190 
metres!) more westerly than the determination of 1870. 
The question is now: May this discrepancy be explained in a 
reasonable manner through the uncertainty with which the measure- 
ments are encumbered. 
The uncertainty arises from the following sources of error: 
1) The astronomic determination of longitude. 
2) The astronomic determination of azimuth. 
3) The base measurement. 
4) The triangulation. 
1) WEGENER gives in Peterm. Mitt. 1912 the difference as 590 m, which information 
he got from me. The longitude of the observatory in Danmarks Havn was 
then not finally computed, and the co-ordinates of the triangulation stations were 
not determined. In order to answer WEGENER’s question as to the position of 
Haystack, I undertook at the time a rough computation of the triangulation 
net, and knowing the use which the information was to be put to, I was 
extremely careful not to get the position of Haystack too westerly. 
