6] 6 SCIENTIFIC RESULTS OP ZIEGLER POLAR EXPEDITION 



Azimuth 



The star tratisit observations were also used in determiaing azimuths. The results are as 

 follows : 



After the meridian mark at Cape Auk was established, February 12, 1904, numerous 

 measurements of the angle from it to the magnetic hut were made during the year 1904. The 

 mean value from these observations of the included angle was 55" 58' 28". From the obser- 

 vations of the lower and upper culminations of the circumpolars e Ursse Minoris and 19 H 

 Camel, respectively, on February 12, 1904, the correction to this angle on account of coUima- 

 tion, azimuth, and inclination of axis deviations was — o."i. Hence the azimuth of magnetic 

 hitt from astronomic observatory by reference to the meridian mark on Cape Auk is S 304° 

 01' 32" W, a value agreeing very well with those obtained above. The resulting mean value 

 adopted is S 304"" OJ' 34" W- 



Remarks 



One of the difficulties encountered in observing at low temperatures was caused by th6 

 accumulation, due to the condensation from the breath and the proximity of a warm body, of 

 small particles of frost over the different parts of the instrument. It is thought that the 

 irregular readings of the striding level are due more to the presence of ice particles on the axis 

 of the telescope than to any change in the inclination of the axis itself. This ice, which was 

 being continually deposited, was removed as far as possible by dusting the pivots at each level- 

 ing and by wiping them and the wyes at the beginning and middle of each time set (^arhen the 



*As obtained from the least-square reductions. 



