248 Dr Richardson's Observations on Solar Radiation, 



TABLE III. 



Of the Monthly Mean excess of the unsheltered Black-bulb Thermo- 

 meter over one in the Shade, at the several hours of Observation. 



OBSERVATION OF PRECEDING TABLE. 



Hours. October. November. December. January. February. March. April 



8 A.M. 



9 ... 



10 ... 



11 ... 



Noon. 



1 P.M. 



2 ... 



3 ... 



4 ... 



5 ... 



+ 24.20 

 + 17-50 

 + 18.92 

 ■+ 21.88 

 + 20.38 



— 3.28 

 + 1.78 

 + 2.91 

 + 1.60 

 + 2.32 



— 16.12 



— 17-34 



— 14.42 



— 13.72 



— 15.45 



29.30 



■ 3:i. 89 

 •25.35 

 ■25.60 



■ 29.60 



— 13.70 



— 11.14 



— 9.20 



— 8.33 



— 7.72 



— 8.24 



— 9.35 



11.11 

 6.95 

 3.38 

 1.95 

 0.03 

 0.84 



171 



1.47 

 0.24 

 2.94 



15.18 

 17.72 

 19.50 

 21.07 

 21.51 

 22.22 

 21.44 

 22.84 

 22.35 

 19.64 



The observations were recorded only at favourable times in the months 

 previous to February. Thus, in 



October at 10 h. there were but 6 obs. ; at 11 h., 4 obs. ; at noon, 6 obs. ; 

 at 1 h., 4 obs. ; and at 2 h., 8 obs. 



November, at 10 h., 8 obs. ; 11 h., 12 obs. ; noon, 16 obs. ; 1 h., 9 obs. ; 2 



December, at 10 h., 4 obs. ; 11 h., 18 obs. ; noon, 22 obs. ; 1 h., 20 obs. ; 2 



January, at 10 h., 7 obi. ; 11 h., 8 obs. ; noon, 16 obs. ; 1 h., 7 obs. ; 2 



b., 6 obs. 



February, only 2 obs. at 8 a.m., but daily at the other hours, except 4, 

 when the observations were necessarily confined to the last 14 clays, the sun 

 not being above the horizon before. 



March, daily at each hour, except at 11 h., when 29 obs. ; 4 h. when 30 ; 

 and 5 h., 18 obs. .-.,", 



April, at 8 h., 28 obs. ; 9 h., 29 obs. ; 10 h., 29 obs. ; 11 h., 29 obs. ; 2 h., 

 20 obs. ;' 4 h., 28 ; 5 h., 21 ; at the other hours daily. 



