68 Professor Hansteen on the Position and Revolution 



fessor Hansteen has obtained the following results, from which 

 two of the most discordant are rejected : 



Distance of the Pole S from 



the Pole of the Earth. 



20° 26' 



20 5S 



21 30 

 19 47 



19 53 



20 27 

 19 39 



21 48 



Mean, 20° 33'.5 



Mean, 



But, in the year 1642, Professor Hansteen found these po- 

 sitions, from the observations of Jansen Tasman, to be, 



Distance from Pole, 

 Long. East of Greenwich, 



18° 55' 

 146 59 



Hence, in 131 years, the pole S has moved westward 10* 14', 

 or 4 / .69 per annum. 



Its period of complete revolution will be 4605 years. 



3. On the Position of n, the weakest Magnetic' Pole in the 

 North Hemisphere in Siberia. 



By combining a number of observations made in 1805 at 

 Tobolsk, Tara, and Udinsk in Siberia, Professor Hansteen ob- 

 tained the following results : 



Distance of n from 

 the Pole of the Earth. 



4° 27' 

 4 50 



Long. Hast from 

 Greenwich. 



116° 27' 

 115 51 



Mean, 4° 38' 30" 



Mean, 116° 19' 



But, in 1770, Professor Hansteen found the positions of 

 this pole to be, 



Distance from Pole in 1770, 

 Long. East of Greenwich, 



4° 14' 

 91 29 30" 



