POLARISATION OF THE ATMOSPHERE. 



281 



1843, August 19.— Barom. 29-6, falling; haze all forenoon. 



Apparent Time. 

 7 51 

 7 23 R = 27|° maximum polarisation. 



Arago. 

 18° 53' 

 18 30 



Babinet. 



17° 50' 



1843, September 6.— Barom. 30 05; splendid, hot day. 



Apparent Time. 



7 h ll m 

 7 18 



Arago. 

 23° 10' 

 Babinet. 



16° 32' 



1843, September 9.— Barom. 3005; fine day. 



Apparent Time. 

 6 h 55 m 



Arago. 

 19° 25' 



Babinet. 

 17° 23' 



1843, September 13.— Barom. 29-98; fine day. 



Apparent Time. 



Arago. 

 fiii fim f Neutral point in horizon; R= 25° maximum polar- ) 1f . _., 



\ isation in S. horizon. j 



6 48 Babinet. 



6 53 R= 30° maximum polarisation in zenith , 23J° in S. hor. 16° 26' 



1843, September 20.— Barom. 2980 ; no rain. 



Apparent Time. Arago. 



6 h 14« Clouds W., clear E ; R=23i° zenith, 24|° horizon. 17° 42' 



1843, September 21. — Barom. 30-0, rising 



Apparent Time. 

 5 h 46 m 

 6 3 

 6 28 



Arago. 

 fl8° 59' 



r 



5 51 



6 31 



R=.30° maximum polarisation in zenith, 25h° in J 17 55 

 horizon ; not a cloud in the sky. > Babinet, 



18 54 

 18 43 



1843, September 22. — Barom. 30*28, rising ; thick in horizon, with a brownish 



red light. 



Apparent Time. Arago. 



6 h l m 18° 22' 



6 7 R = 29|° maximum polarisation in zenith, 22£° in hor. 19 58 



1843, October 31.— Barom. 29-39 ; fine sunny day. 



Apparent Time. Arago. 



4 h 9 m 15° 40' 



4 22 17 56 



4 59 20 49 



Babinet. 

 4 24 R=29|° maximum polarisation in zenith, 25|-° in hor. 17° 8' 



4 45 Polarisation of moon 24^°. 



