1915- ^c). 5- ROALD Amundsen's ANTARCTIC EXPEDITION : meteorology. 45 



was S\V true, and the distances registered 12'. 9. 4'. 4 and 16'. 9, total 34.2 

 minutes of arc. The spherical triangle with sides the colatitude on the mor- 

 ning of the 19''' 4"^ 45'. the colatitude of the ^Butcher's« 4^24', and the 

 corrected distance 31'. 2. gives difference of longitude 4*^ 49'. 9 and course 

 45^^ 27'. The difference between the assumed and computed course is only 

 27'. The position of the camps on the 19*^ and 20^'' have been computed 

 iVom the colatitude of the camp on the morning of the 19*'', the distance 

 made from this camp, and the computed course. 



From the -Butcher's« the course was shaped as nearly as possible due 

 South along the new meridian. On the 10*^ December the last observations 

 for the determination of the variation of the compass were taken. The 

 change of the altitude of the Sun became too small to give any reliable 

 value of time and azimuth. During the succeeding days the course was 

 shaped NE by X, the variation found on the 10^^ being applied. With the 

 really increasing variation, the western longitude of the Expedition was 

 increased and the longitude of 180'^ passed on the 14^*^ December in lati- 

 tude 89^38'. On the 15*^ the observation of the Sun at noon gave 

 the latitude 89*^ 54'-6. At 3 p. m. the Expedition stopped, the distance 

 from the station at 88^30' registered being 1^30' or equal to the distance 

 from the Pole. 



A midnight observation of the Sun gave a latitude of 89^ 56', some- 

 what uncertain. 



In order to fix the latitude and the direction of the meridian, 18 al- 

 titudes and compass-bearings of the Sun were taken on the 16'^ Decem- 

 ber between 7 a. m. and 7 p. m. The computation made by Mr. Alexander^ 

 gave the latitude 89° 54' ± 2'. 



The distance from lat. 88*^ 30' to lat. 89*^ 54', registered by the sledge- 

 meters, was 90 miles or i'^3o'. The spherical triangle between the Pole 

 and these points gives the general course 3^49' S— W, and the diff"erence 

 of longitude 88*^ 5'. 4 



We can now compute the longitude of the camp at 88" 54'. 

 Longitude of Framheim 163^37' ^^ Greenwich. 



— r> Station lat. 85° 15' 162 50 » — 



— » the »Butcher's« (add 4^50) 167 40 — 



— >> Station lat. 89*' 54' (add 88«^ 5') 255 45 — 



or 104 15 E — 



Mr. Alexander calculated the longitude of the last station to be about 

 7 hours or 105^ E. 



* The South Pole. II, p. 400. 



