96 



on this occasion we obtained a deviation on a galvanometer 

 in the circuit from the point-apparatus to a plate of platine 

 in the earth. The observations made 11 years låter 1882 

 — 84 show that the beam must have been produced by the 

 point-apparatus. 



The second time we observed this phenomenon was 

 the 29 of December 1882 and a description of it will be 

 caraeteristic of these phenomena in general. 



The point-apparatus on the top of Pietarintunturi had 

 just been finished and the conducting wire through the gal- 

 vanometer to the earth-plate in a little spring was ready, 

 when a feeble aurora appeared. Having measured the cur- 

 rent on the galvanometer, placed in a little cot of branches, 

 I began to observe the aurora with the spectroscope. As 

 the temperature vas about — 35° C, the observation was 

 a little difficult, b ut together with my assistant Mr Granit 

 (Engineer) we at last succeeded to see the y. r. Turning 

 a little to the left 1 glanced at the mountain top and ob- 

 served there a white-yellow luminous beam of a height of 

 about 120 m. The spectade was grand and the four per- 



