5$6 APPENDIX. 



D 



during two winters, was any sound heard to accompany 

 the motions. 



The aurora was frequently seen at twilight ; and as 

 often to the eastward as to the westward. Clouds, 

 also, were often perceived in the day-time, in form and 

 disposition very much resembling the aurora. 



The observations are set down just as they were 

 taken. I read off the arc of the needle, and Mr. King 

 remained on the outside of the observatory, to inform 

 me of the changes in the coruscations. The height of 

 the arches was estimated by the eye ; and their bearing 

 by reference to the houses and other marks which had 

 been previously determined. The bearings are reckoned 

 from the magnetic meridian. 



Rough Notes on the Aurora. 



"S 



October 27th, 1833. — The needle evinced no par- 

 ticular agitation throughout the day, except the same 

 tremulous motion it displayed occasionally night and day. 

 At midnight the weather changed from an overcast to a 

 blue and cloudy sky. The moon was clear, and the 

 coruscations streamed in beams in the direction of the 

 dipping needle, and formed an undulating fringed arch/ 

 from a horse-shoe shaped mass, at N. N.W., 10° high 

 to 70° northerly. This was met by two bright beams, 

 which issued from E. N. E., 15° high. On entering the 

 observatory I found the needle vibrating, and on the 

 approach of the fringed arch towards the zenith, it im- 

 mediately attained to 1° 0' W., and before Mr. King 

 had informed me that beams were darting from the 

 eastward, it bad already begun to recede, and fixed at 

 1° 0' E. ; afterwards, on the apparent motion of the 



