ON THE POLARISATION OF THE ATMOSPHERE. 



215 



Septen 



iber 



6.- 



-Bar 



om. 29-5 



Mean T 



ime. 







R=Ma 

 In Zenith. 



6^ 22™ 



P.M. 







29i° 



6 30 



jj 







... 



6 35 



;) 







28i 



6 49 



)> 







28i 



7 



!> 







• • ■ 



7 6 



?) 









7 15 



)5 







... 



irisation. 



Height 



of Neutral Point above 



In Horizon. 



th 



e Antisolar Point. 



19° 7' 

 19 45 



27i 





20 21 



26i 





21 20 



1841, September 12.— Barom. 2975. Sky clear. 



Mean T 



ime. 



6h 



gm 



P.M. 



6 



20 





6 



24 





6 



46 





6 



49 





6 



58 





R=:Maximuni Polarisation. 

 In Zenith. In Horizon. 



27r 



25^ 



Height of Neutral Point above 



the Antisolar Point. 



20° 



35' 



20 



45 



21 



7 



22 



2 



22 



10 



23 



54 



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



Mean Time. 



4h 23' 



P.M. 



5 



24 



)) 



5 



31 



5) 



6 



2 



J5 



6 



12 



19 



R=Maximum Polarisation. 

 In Zenith. In Horizon. 



37i° 



29^ 



30 



Height of Neutral Point above 

 the Antisolar Point. 



24r 



28° 



10' 



29^ 



21 



35 



... 



21 







... 



23 



51 





24 



15 



At 5'' 24°" the sky was clear, but whitish, and not blue, 

 the neutral point. 



A little cloud below 



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



Mean Ti 



me. 



4h 18m 



P.M. 



4 



24 





4 



29 





4 



37 





4 



44 





4 



52 





R^Maximum Polarisation. 

 In Zenith. In Horizon. 



25J 



26 



25* 



Height of Neutral Point above 



the Antisolar Point. 



21° 



5' 



21 



50 



21 



27 



21 



13 



21 



23 



21 



45 



1841, November 2. — Barom. 30*7. Fine day ; dry haze. 



Mean Time. 



R=Maximum Polarisation. 

 In Zenith. In Horizon. 



Height of Neutral Point above 

 the Antisolar Point. 



2^ 30^ P.M. 

 2 30 



43 



22 



51 



15 



36 



58 



The neutral point rises. 

 26r 



25 



22^ 



13° 



20' 



18 



20 



18 



45 



21 



32 



19 



54 



19 



20 



22 



22 



VOL. XXIII. PART II. 



3 



