348 



Sir David Brewster on the Polarization 



1842, February 5. 

 fectly clear. 



-Barom. 30*05 in. Fine day; sky per- 



Apparent time. 

 h m 



1 51 

 1 44 



3 48 



4 9 

 4 31 



3 51 



R=28i| in zenith, 26|° to 18±° on E. 

 horizon, neutral line convex to sun. 



Arago. 



17 25 

 23 10 

 22 15 

 20 50 

 20 30 



Babinet. 



4 7 17 20 



4 33 R=28£° in zenith .. .. 19 42 



9 5 a.m. R=22i° at 30° alt. S.W. horizon. 20 38 

 12 34 p.m . R = 27f° in zenith, 20|° in horizon. Dark 



haze in horizon from E. to W. by N. 

 2 6 „ R=27|° in zenith, to 14^° in horizon. 



1842, February 10. — Fine day, but cloudy. 



Arago. 



2 57 R=24^° at 25° above W. horizon. 16 45 



3 58 . . . . . . . . " 19 20 



4 45 R=26i° in north .. .. 17 43 



Babinet. 



3 59 R = 29° in zenith, and at alt. 30° E. hor. 18 38 



4 5 .. .. .. .. 19 4 



4 41 •• .. .. .. 21 50 



Clouds came on, followed by great rain and wind, at 10 b p.m. 



1842, February 11 . — Rain in the forenoon and till 2 h 30 m p.m. 



3 19 



3 55 



4 20 

 4 38 



3 22 



3 53 



4 23 

 4 36 



4 5 



Arago. 



R = 24^° at 30° above S.E horizon. 17 33 



R=29±° in zenith. Sky quite clear. 21 8 



R=29±° in zenith. Sky quite clear. 19 45 



20 5 



Babinet. 



16 19 



17 

 19 34 



R = 29^° in zenith. Neutral line con- \ , ft q /? 

 vex to sun. R=28£ at 15° alt. ( 10 °° 



R=28^° in zenith, and in N. horizon. 



1842, February 12. — Barom. 29'3 in. Rainy, with wind. 

 Cleared up at 4 h . 



Arago. 



4 18 | ( 17 28 



> Clouds passed away. . . { Babinet. 



4 20 j (17 12 



3 55 R = 24|°, but reduced to 20^° when 



watery clouds passed over the sky 



from W. to S. 



