276 



SIR DAVID BREWSTER ON THE 



1843, January 30 — Barom. 29-50. Windy. 



Apparent Time. 



12 h 18 m 



1 47 



2 28 



3 55 



3 



{ 



Arago. 



Neut. point below horizon, R = 21°, maximum clear. 15° 40' 

 Neut. point below horizon, R = 24J° in zenith to \-in 9 c 



14|° in horizon. 



} 



11 29 



_ 2 ( R=28J° maximum polarisation in zenith, to 21 J° "> 1 „ ~ q 

 \ in horizon. J 



18 32 



Bahinet. 

 19° 0' 



._ J R=27|° maximum polarisation in zenith, to 21£° ),„ ot- 

 \ in horizon. j 



1843, February 15. — Very cold day; clear only in north. 



Apparent Time. 

 2 h 57 m 



Arago. 

 16° 5' 



1843, February 16. — Barom. 29-18, rising. Fine sky. 



Apparent Time. 

 ll h 56 m R=25° maximum polarisation, 20° in horizon. 



12 57 



12 57 



3 28 



( R=29-J° maximum polarisation in zenith, 24 }/ 

 \ in horizon. 



( R=29£° maximum polarisation in zenith, 26|-° 

 (^ in horizon. 



R=30° 



Babinet. 



9° 40' 

 Brewster. 

 11° 25' 



Arago. 

 1 12° 52' 



| 18 40 



17 52 

 14 52 

 17 26 



1843, February 17. — Barom. 29*6. Sky not clear in N. horizon. 



Apparent Time. 

 3 h 6 m 

 3 30 



Arago. 

 11° 28' 

 14 14 



1843, March 4.— Barom. 30-08. 



Apparent Time. 

 3 h 35m 



3 46 



3 54 



4 6 



R=14|-° maximum polarisation in zenith plane. 



Arago. 

 16° 45' 

 17 30 



Secondary neut. point 50' high. Hazy in horizon. 17 57 



20 30 



1843, March 7. 



Apparent Time. 



4 b 40 m R=24J° maximum polarisation in zenith. 



Arago. 

 17° 0' 



1843, March 8.— Barom. 30-13. Wind east ; hazy. 



Apparent Time. 



4 h 14 m ll=24|° maximum polai'isation. 



Arago. 



17° 47' 



