181° 



» 





10 14 



14 33 



15 31 





Babinet. 



19 49 



462 Sir David Brewster on the Polarization 



1844, February 3.— See Phil. Mag. vol. xxx.pp.126, 165. 

 1844, February 6. — Snow on ground. 



Apparent time. Arago. 



h m 



3 13 .. .; ., ti 19 1 



Babinet. 



3 19 R=25° max. pol. in zenith plane. 17 58 



4 2 R=27° max. pol. in zenith, 19^° in horizon. 



1844, February 7.— Clouds over zenith ; snow. 



Arago. 



2 18 .. .. .. .. 18 13 



1844, February 16. — Barom. 29*74 in. ; wind west; fine day. 



12 14 R=265 maximum polarization, to 19|° in horizon. 

 1 58 R = 26|° „ „ 20^° 



o 1 K — 23a „ „ 



3 14 Neutral point in horizon. 

 3 20 

 3 24 Secondary neutral point in horizon. 



3 33 Sky clouded 



4 6 Secondary neutral point disappears. 



4 32 

 1844, February 21.— See Phil. Mag. vol. xxx. p. 127. 

 1844, February 27. — Barom. 29*12 in., rising. Thaw. , 



3 16 Polarization of moon 17 2°« Arago. 



3 44 •• .. .. .. 14 10 



1844, March 7. — Barom. 30*03 in., rising. Fine day. 



4 4Q i White nebulosity in zenith ;R= 13° max-) -.q on 



I imum polarization . . . . ) 



1844, March 27.— Barom. 29*70 in., rising. 



5 40 Polarization of moon 22^° . . 20 40 



1844, April 11. — Fine day and fine evening; wind west. 



6 23 R=27° max. pol., 22i° in horizon. 18 23 



7 1 .* 18 37 



Babinet. 



6 24 . . . . . . . . 20 50 



7 3 .. .. .. .. 19 19 



1844, April 22.— Fine day. Barom. 29*80 in. 



Arago. 



6 29 R = 27|° max. pol., 22|° in S. horizon. 19 31 



7 15 . . . . 20 34 



Babinet. 



6 37 „ 21 32 



7 18 R=28|° max. pol., 22 J° in S. horizon. 17 28 



