AKSEL S. STEEN. [2nd ARC. EXP. fram 



vatory there, and Professor J. Edler, his assistant (who died in 1905), 

 he made a number of observations which showed that the deflectors of 

 the Zschau apparatus had unfortunately had their magnetic moment 

 considerably weakened. I shall explain this more fully in a later section 

 of this paper. 



For the temperature readings in the magnetic observations of the 

 Expedition, the thermometers belonging to the magnetic apparatus were 

 always used. Their corrections cannot be seen to have been especially 

 determined, and must therefore be considered as included in the con- 

 stants of the instruments. 



The Expedition took with them various chronometers, and of these 

 the box-chronometer Frodsham was used for vibration observations, and 

 the box-chronometer Kulter served as standard clock. The other watches 

 were compared almost daily with the latter, and a journal kept. When 

 the astronomical observations had been reduced and calculated after the 

 return of the Expedition, I obtained a statement of the chronometer 

 Kutter's error on Greenwich mean time for, in all, 24 different days 

 during the time from the 4th May, 1899, to the 20th July, 1902. I 

 have also obtained a statement of the final values of latitude and longi- 

 tude for the four winter havens, where the magnetic observations were 

 made. By the aid of this material, together with the clironometer 

 journal, I have been enabled to calculate the error on local time and 

 the daily rate (during the vibration-observations) of the watch employed 

 in each separate case in the magnetic observations. The hours men- 

 tioned in this paper are thus all local time. 



As mentioned above, magnetic observations were only made in the 

 four winter havens, and always on land. The four stations were as 

 follows : 



Station I. Rice Strait, r/) = 78° 46', ;i = 74° 57' W. A series of 

 observations was made here on the south side of the 

 haven, between the 25th November and the 2nd De- 

 cember, 1898, and between the 27th and the 30th May, 

 1899. Station I a. 



From the 5th to the 9th June, 1899, observations of 

 declination and horizontal intensity were made on the noith 

 side of the haven. Station I b. 



The distance between the two points of observation 

 was about 450 or 500 metres. 



A snow hut was erected at Station I a, in which to 

 make the observations. In Ihe centre of it was placed 



