Survey of Northeast Greenland. 293 
longitude is concerned the particularly good connection with Peary's 
Cairn further serves to strengthen this supposition. 
The sledge trip to Dronning Louises Land in May 1908 
(see the map: 1:500000, PI. Ш). 
This voyage, extending over forty-three days (from April 24th to 
June 5th) was a hand-sledge journey i. e. a sledge journey without 
the assistance of dogs. The object was among other things the 
mapping out of Anneksgen, Kofoed Hansens Bre and the northern 
part of Dronning Louises Land. During this voyage I used, as in 
1907, the chronometer 57203 and watch K, the latter as an observation 
watch and ordinary timepiece. The mean value of the rate throughout 
the journey was determined by determinations of time in the per- 
manent Observatory on April 22nd, before the departure, and on 
June 6th, after the return; besides we succeeded in controlling the 
rate by two determinations of time, taken in the same place on the 
edge of the inland ice northwest of the Anneksgen, on May 11th, 
before the ascent on the inland ice, and on May 23rd, after the 
descent. The result of these four determinations of time were the 
following: 
| | | Rate in twenty-four hours 
| Date | Interval | by the clock 
| 
Place of observation | | : 
| | | 57208 Watch K 
Danmarks Havas. Le 221У |\ ER À | 
BE GE Re hace tele RP 
i inland ice.. | 11/V | | 
Phe: EGS es in a ice aa | 12 days | + 3m538.9 | 4 
In the computation of the difference of longitude between Dan- 
marks Havn and the edge of the inland ice the value Ju = — 3m53s.3 
was used. The two values obtained for the difference of longitude are: 
The observations 22/IV and 11/V diff. of long. Danmarks Науп — папа 
се. Mas 
— 23/V and 6/VI | — Danmarks Havn—inland 
ice 120 
The mean of the two values gives 111575 — 2°59'.2 
Danmarks Havn west of Grw. —  ......... 18°42'.6 
The edge of the inland ice west of Grw. gives 21°41’.8. 
In the preparation of the map this value was not used, in that 
from the points ХХШ and XIX in Moskusfjældene and Trekroner, 
determined by triangulation, we succeeded in carrying the deter- 
