380 F. W. Very — Shy Radiation and Isothermal Layer. 

 Summer Measurements. 



Date. 



Time. 



State of the Sky. 



6 



OS o> 



3 ft 



o S 



>> 



11 



eg p 

 "3-3 



3 

 o 



ft 



f£ 



a> 

 P 



3 



Si 



B 3 

 oS£ 



5n M 

 ft-S 

 go 

 H 



<v 3 



P 



54_ 3>* 



as 



co a, 



ft 0) 

 03-^ 



a> t-i 



tP ft o 

 <D 



1909 



F. 



C. 



July 3 



5:10 p. 

 5:20 p. 

 5:48 p. 

 5:55 p. 

 7:05 p. 

 9:20 p. 



Zenithal sky a good blue 



(A few widely scattered cumuli) 



F. 



--- 



F. 



72° 



72 



72 



72 



72 



72 



div. 

 -349 

 -33-9 

 -30-7 

 -32-5 

 -39-5 

 -32-9 







-53-7 

 -52-2 



-47-2 

 -50-0 

 -60-8 

 -50-6 



o 



+ 18-3 

 + 19-8 

 + 24-8 

 + 22-0 

 + 11-2 

 + 214 



o 



- 76 



- 6-8 



- 4-0 













- 56 







58° 



57 



0~-77 



so" 



-11-6 







- 5-9 













Mean sky temperature for the 

 day — . 

















o 



- 6-9 























July 4 



7:50 a. 

 8:00 a. 

 8:20 a. 

 3:53 p. 

 5:29 p. 



Deep blue sky 









74 

 74 

 74 

 78 

 72 



-29-8 

 -28-7 

 -35-7 

 -27-5 

 -29 5 



-45-8 

 -44-2 

 -54-9 

 -42-3 

 -45-4 



+ 28-2 

 + 29-8 

 + 19-1 

 + 34-7 

 + 26-6 



- 2-1 



(A few white fracto-cumuli) 



67" 



72-4 



: 72 

 0-69 



57-5 

 62 



- 1-2 



- 7'2 







+ 1-5 





(After a shower) . . 



- 3-0 



















Mean sky temperature for the 

 day — 

















o 



- 2-4 























July 5 



7:30 a. 



9:00 a. 

 9:15 a. 



9:45 a. 

 10:10 a. 



10:45 a. 

 10:55 a. 



11:55 a. 



Deep blue sky. Quite clear 

















. 



Measures at various 

 Sky at zenith 



66-7 



75 



0-72 



0-62 



57 

 61 



72 



78 

 79 



80 



80 



80 

 80 



80 



—29-1 



-12-2 

 -10-8 



-18-8 

 -23-6 



-22-3 



-20-9 



-28-0 



-44-8 



-18-8 

 -166 



-28-9 

 -36 3 



-34-3 

 -32-2 



—43-1 



+ 27-2 



+ 59-2 

 + 62-4 



+ 51-1 

 + 43-7 



+ 45-7 

 + 47-8 



+ 36-9 



- 2-7 





Sky 5° above east horizon 



Sky 15° above east horizon 



Sky 30" above east horizon 



it a a. 



Sky at zenith — deep blue 



+ 15-1 

 + 16-9 



+ 10-6 

 + 6-5 



+ 7-6 



+ 8-8 



+ 2-7 



The meteorological conditions on the morning of February 

 4th, 1909, have already been described. Owing to the high 

 relative humidity, radiation of long wave-length was much 

 obstructed and the observations of sky radiation are not com- 

 parable with those of other dates. They are as follows : 



div. 



5 : 1 5 a, air 0°, instrument 60°, sky deflection. = — 53*1 



5 :35 a, deflection from snow at — 6° F. _.. = — 42*1 



10:33 a, (relative humidity = 0*925) deflection from 



snow at + 20° F _--- = —20'7 



10 :48 a, deflection from sky = — 37*1 



