358 Sir David Brewster on the Polarization 



1842, September 28.— Fine day. 



Apparent time. 



h m Arago. 



4 32 R = 28° max. polarization in zenith plane. , 

 4 58 . . . . . . . . 18 36 



1842, September 29. — Fine day; cold; wind east. 



4 37 R=30£° maximum polarization in zenith. 



5 11 17 34 



1842, September 30.— Fine day. 



4 18 R= 29£° max. pol. in zenith, to 26|° in hor. 



4 24 Neutral point not risen. Bands +. 



4 55 .. .. .. .. 16 11 



5 47 .. .. .. .. 18 18 



Babinet. 



4 58 .. .. .. .. 15 23 



5 44 R=29£° max. polarization in zenith plane. 17 28 



1842, October 15. — Fine day. Barom. 30 in., rising. 



Arago. 



4 32 R=29i° max. pol. in zen. to 26^° in hor. 18 



5 11 



5 42 



4 34 



5 9 



5 46 



1842, October 19.— Barom. 29*3 in. Cold. 



4 56 R=27£° max. pol. in zenith plane. 



5 5 



5 8 



1842, October 20.— Barom. 29*62 in. Fine day; cold. 



Arago. 



4 15 R=26£° near S. hor. Clouds in zenith. 14 46 

 1842, October 21. 



4 49 Neutral point above a cloud .. 18 13 



1842, October 24. — Barom. 29*33 in. Rain in the morning ; 

 cold. 



4 28 . . . . . . . . 18 46 



Babinet. 



4 32 R= 27° max. polarization in zenith plane. 21 59 

 1842, November 9. — Barom. 29*06 in., after a storm of wind 

 and rain. 



Arago. 



4 41 Polarization of moon in S. horizon 25£°. 17 20 

 1842, November 14.— See Phil. Mag. vol. xxx. pp. 125, 164. 



1842, November 15.— Barom. 29*72 in. Hard frost in 

 morning. 



2 12 Secondary neutral point in horizon. 17 50 



18 11 

 25 30! 



Babinet. 



15 23 

 17 26 

 20 



Arago. 



19 11 



20 9 



Babinet. 



16 39 



