122 



Sir David Brewster on the Polarization 



1841, September 6. — Barom. 29*5 in. 



P.M. 



Mean time, 

 h m 



22 

 30 

 35 

 49 







6 

 15 



R=maximum polarization. 



29i 



28^ 



In horizon. 



m 



Height of neutral point 

 above the antisolar point. 



1841, September 12.— Barom. 29'75 in. 



6 8 p.m. 2U 25± 



6 20 „ 



6 24 „ 



6 46 M 



6 49 „ 



6 58 „ 



1841, September 29. — Barom. 28 '73 in., after rain. Sky clear. 

 4 23 p.m. 3U 24i 



5 24 



5 31 



6 2 

 6 12 



37^ 

 29^ 

 30' 



29; 



19 



7 



19 45 



20 21 



21 



20 



21 







21 



2 



23 







Sky< 



jlear. 



20 35 



20 45 



21 



7 



22 



2 



22 10 



23 54 



er rain. S 



28 



10 



21 



35 



21 







23 51 



24 



15 



At 5 h 24 m the sky was clear, but whitish, and not blue. A 

 little cloud below the neutral point. 



1841, October 23. — Rainy day. Cleared up at 3 h p.m. 



4 18 p.m. 



, , 



. . 



21 5 



4 24 „ 



. , 



. . 



21 50 



4 29 „ 



27i 



251 



21 27 



4 37 „ 



. . 





21 13 



4 44 „ 







21 23 



4 52 „ 



26 



251 



21 45 



, Novembe 



r 2. — Barom. 



30-7 in. 



Fine day; 



2 30 p.m. 



\ The neutral I 

 ) point rises, j 







2 30 „ 



26i- 



22*- 



13 20 



2 43 



j 







18 20 



3 22 



> 



25 



22i 



18 45 



3 51 



> 







21 32 



4 15 



» 



, . 





19 54 



4 36 



> 



. . 



, . 



19 20 



4 58 



» 







22 22 



1841, November 4. — Barom. 30*2 in. A foggy day; sky to- 

 lerably clear of clouds. 



1 50 The neutral point just risen above the thick haze near the 

 north horizon. The bands of the polariscope are all 

 rugged at the edges, indicating an abnormal state of the 

 air. R = 2H° in zenith, and 15° in horizon. 



3 13 p.m. 24 52 



