216 SIR DAVID BREWSTER 



1841, November 4. — Barom. 30'2. A foggy day ; sky tolerably clear of clouds. 



^h 50m 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 = 21|-° in zenith, and 15° in horizon. 



,, ~. Height of Neutral Point above 



Mean Time. .^u * x- i m- 



the Antisolar Time. 



3" 131° P.M. 24° 52' 



This singular height of the neutral point arose doubtless from the haze in the 

 horizon. 



„ ™. R=Maximum Polarisation. Height of Neutral Point above 



In Zenith. In Horizon. the Antisolar Point. 



S*' 45°' P.M. 22i° 19^^' 



4 12 „ ... ... 19° 56' 



4 17 „ ... ... 20 3 



1841, November 25. — Barom. 2963. Singularly fine day. 



B=Maximum Polarisation. Height of Neutral Point above 



In Zenith. In Hoiizon. the Antisolar Point. 



27r 25r 



27i 25i 



Api)arent Time. 



10»'31m 



A.M. 



12 









2 



21 





3 



3 





4 



20 





4 



24 





4 



38 





284 26 



14° 



30' 



14 



6 



17 



35 



18 



45 



19 



50 



18 



40 



19 



20 



27i° 



21° 



46' 



t . • 



20 



38 



... 



20 



40 



n 



27^ 27i 



1842, January 29. — Barom. 29*93. Fine day; clear sky; snow covers the 

 ground partially. 



, . (. rr- R^Maximum Polarisation. Height of Neutral Point above 



PP In Zenith. In Horizon. the Antisolar Point. 



3'^ 34™ A.M. 27° 



3 52 „ 



4 10 „ 



1842, February 15. — Rain in morning; fine day afterwards; Barom. 30*05 

 wind west. 



R=Maximum Polarisation. Height of Neutral Point above 



In Zenith. In Horizon. the Antisolar Point. 



g^ j^o f 18^° in S. H. ) Neutral point 



^ i 22i in W. H. j" not risen. 



In App. H. 7° 30 



26* 18^ 8 17 



9 7 



14 35 



16 55 



27i- 221- in S.E. 17 52 



The observations at 3"" 38"', 48°*, and 58° are recorded as good, and made in 

 the finest sky. 



The state of the atmosphere was peculiar near the horizon, as will be seen in 

 the section on a secondary neutral point. 



Apparent Time. 



3^ 



13™ 



A.M. 



3 



38 





3 



48 





3 



58 





4 



21 





4 



47 





4 



51 





I 



I 



I 



