Meteorological Observations for October 1830. 465 



AURORA BOREALIS. 



At 20 minutes past 7 o'clock in the evening of the 5th of October, 

 an aurora borealis suddenly rose between the N. by E. and N.W., 

 a little above the edge of a dark cirrostratus cloud, which was seven 

 or eight degrees above the horizon: after remaining a steady arc 

 about ten minutes, several thin columns of light emanated from 

 it, and two meteors passed under Ursa Major. A few minutes 

 before eight, two or three more coruscations rose from the aurora, 

 which was perceptible till after the moon rose. 



At ten o'clock in the evening of the 16th an aurora borealis 

 again appeared, from which several wide red columns emanated 

 between the true and magnetic north, and rose to the same altitude 

 as the star fi in Ursa Major. The aurora disappeared in half an 

 hour, and one meteor fell near the star Benetnasch. It also ap- 

 peared the following evening, but without any coruscations ; and 

 two meteors appeared over it. 

 Gosport. 



OCCULTATION OF ALDEBARAN BY THE MOON. 



In the morningof the 6th of October, at 6 h 46 m 21 s apparent time, 

 an immersion of Aldebaran behind the moon's enlightened limb, about 

 22° on the right of her vertex, was observed at Gosport. Alde- 

 baran appeared on the moon's limb nine or ten seconds before it 

 finally disappeared, but this unusual time was owing in a great 

 measure to the oblique immersion of the star, and the consequent 

 small chord which it had apparently to describe. 



The exact time of the emersion was not observed, it having 

 taken place several minutes sooner than the computed time ; but it 

 could not have exceeded a few seconds before or after 7 h 2 m apparent 

 time here. Missing the time of the emersion was regretted, as it 

 might have been of some service to those who had taken the trouble 

 to comnute the occultation. 



METEOROLOGICAL OBSERVATIONS FOR OCTOBER 1830. 



Gosport; — Numerical Results for the Month. 



Barom. Max.30-51. Oct. 9. Wind N.E.— Min. 29-76. Oct.29. Wind W. 

 Range of the mercury 0-75. 



Mean barometrical pressure for the month 30-235 



Spaces described by the rising and falling of the mercury 4-260 



Greatest variation in 24 hours 0-430. — Number of changes 18. 

 Therm. Max. 65°. Oct. 22. Wind S.W.— Min. 36°. Oct. 26. WindN. 

 Range 29°. — Mean temp.of exter. air 53 0, 24. For 31 days with © in =2-54-21 

 Max. var. in 24 hours 21°-00.— Mean temp, of spring-water at 8 A.M. 53-32 



De Luc's Whalebone Hygrometer. 



Greatest humidity of the atmosphere, in the morning of the 25th ... 95-0 



Greatest dryness of the atmosphere, in the afternoon of the 13th... 57'0 



Range ofthe index , 38*0 



N.S. Vol. 8. No. 48. Dec. 1830. 3 O Mean 



