126 



GUNN. ISACHSEN. 



[2nd arc, EXP. FRAM 



V. 



Isachsen's Triangulation of Gaase Fjord 

 1902.' 



The base-line A — B was measured twice with a 20- metres long 

 steel tape. Its length was 1496 555 metres + 0.05 metre. 



The main mast of the Fram in her winter haven of 1902 (Lat. 

 76°39'49", Long. 88°38'15") was taken as the origin for the rectangular 

 system of co-ordinates. The positive X axis lay due N, the positive Y 

 axis due E. The orientation of the net was found by the aid of Bau- 

 mann's determination of the azimuth of the levelling-staff. 



Instruments: Plane Table and Altazimuth No. 1. 



Results. 



Slation 



Co-orrlinates 



Altitude 



y 



Base-line A 

 - B 

 Cairn IV . 



- II 



- V . 

 Starting-point 

 Cairn I . . 



- Ill . 



- IX . 

 Station XV 

 Cairn X 



- VI . 



VII . 



VIII . 



XIII , 

 XII . 



XIV . 



+ 



64.71 

 '454-7 

 9583 



4CJO4 o 



78.0 



4231 



- 30S6.7 



- 1231.8 



- 2S75.9 



- 21 1 6. 1 



- 716S.8 



- 2214.2 

 -I- 280.S 



- 4'23-3 



- 3857-9 



- 3523-8 

 + 2125.4 



± 2.4 



+ 1-9 



± 0.6 



+ 3.2 



+ 



iSb2.7 

 1308.0 

 276S.4 

 + 3416-5 



- 5721-7 

 + 43-7 



- S1891 

 + 6678.6 



- 9S2S.6 



- 39>'-i 



- 155579 

 + 10815.9 



+ 18397-9 

 + 10928.3 



- 21462.4 



- '77'2-4 



- 21181.4 



+ 500.0 m + 2.0 

 -t- 19.I ± 0.9 

 4- 316,7 + 2,7 



+ 2.2 



+ 2.0 



+ '-9 



± S.9 



+ 253.8 + 

 + 146,1 + 

 + 273,3 + 2.6 



1.6 

 '-3 



