162 Sir David Brewster on the Polarization 



1841, May 12. — Wind west in the evening. 



R=maximum polarization. Height of neutral point 



Mean time. In zenith. In horizon. above the sun*, 



h m oi o i 



8 10 p.m. .. .. 16 4 



1841, May 16.— Barom. 29*24 in. Windy. 



7 .. .. H 



1841, June 10. — Barom. 29*27 in. Very fine sky. 



10 10 a.m. Sun's altitude about 50°. 2° or 3° 



7 17 p.m. 



13 15 



7 35 „ 



14 55 



7 52 „ 



14 5 



8 8 „ 



16 37 



8 21 „ Sun sets. . . 



15 27 



8 39 „ 



17 15 



8 52 „ 



16 25 



9 3 „ 



16 42 



9 15 „ 



16 20 



1841, September 6. — Barom. 29*55 in. 





6 30 



16 15 



6 45 



14 45 



6 58 



12 55 



7 6 



13 8 



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



Sky clear. 



6 54 



18 53 



7 



18 20 



1841, September 29.— Barom. 28*73 in. 



After rain, sky clear, 



5 46 



12 53 



5 57 



14 55 



6 7 



16 15 



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



4 21 .. .. 17 33 



27 271 25| 15 35 



30 . . . . 14 30 



39 .. .. 15 13 



45 26 251 14 22 



53 .. .. 15 53 



1841, November 2. 



4 50 , . . . 14 51 



1841, November 4. — Barom. 30*2 in. Foggy day; sky tole- 

 rably free from clouds. 



3 13 .. ♦. 14 4 



4 9 .. .. 19 

 4 14 .. .. 17 48 



* In the Edinburgh Transactions, vol. xxiii. p. 223-228, the words 

 antisolar point are by mistake used in place of the sun. 



