362 



METEOKOLOGY OF BEHAR HILLS, &c. 



Appendix A. 



Solar Radiation. 



MORNING. 



AFTERNOON. 



Hour. 



Th. 



77-0 

 69-5 

 77-0 

 63-5 

 61-2 

 67-0 



Black 

 Bulb. 



Difl. 



Phot. 



Hour. 



Th. 



Black 

 Bulb. 



Diff. 



Phot. 



94 A.M. 

 10 . . 



10 . . 



9 . . 

 9 . . 

 9 . . 



130 

 124 

 137 

 94 

 106 

 114 



117-5 



53-0 

 54-5 

 60-0 

 305 

 44-8 

 47-0 



10-320 

 10-230 

 10-350 



34 P.M. 

 3 . . 

 3 . . 

 34. . 

 3 . . 



81-7 

 80-5 

 81-5 

 72-7 

 72-5 



109 

 120 

 127 

 105 

 110 



27 3 

 39-5 

 45-5 

 32-3 

 37-5 



10-320 

 10-330 

 10-230 

 10390 



Mean . 



69-2 



48-1 



10-300 





77-8 



114-2 



36-4 



10-318 



Nocturnal Radiation. 





SUNRISE. 



NINE P.M. 







6 



u 



+3 

 cS 

 u 

 <o 

 ft 



B 



CD 



H 



£ 

 



sri £ 



CD 



a 

 



sri % 



X 

 a 



,0 , 



O 73 

 O 



£> > 



9 3 



<6 

 B 



+a 



c3 

 *-< 



CD 



Ph 



3 

 H 



Mean Difl. from 

 Air. 



a 







J* 



sri.s 



3 

 0.2 



u -^ 

 cd cS 



7 

 6 



7 





Exposed Th 



On Earth 



On Grass 



51-1 



48-3 

 46-6 



4-0 

 2-5 

 6-2 



9-0 

 3-7 

 9-0 



6 

 3 



5 



56-4 



53-8 

 54-4 



5-3 



4-9 



7-2 



7-5 



5-5 



10-0 



On one occasion, and that at night, the dew-point was as low 

 as 11° 5, with a temperature of 6Q°, a depression rarely equalled at 

 so low a temperature : this phenomenon was transient, and caused 

 by the passage of a current of air loaded with dust, whose particles 

 possibly absorbed the atmospheric humidity. From a comparison of 

 the night and morning observations of thermometers laid on grass, 

 the earth, and freely exposed, it appears that the grass parts with 

 its heat much more rapidly than the earth, but that still the effect of 

 radiation is slight, lowering its temperature but 2° below that of the 

 freely exposed thermometer. 



As compared with the climate of Calcutta, these hills present 

 a remarkable contrast, considering their proximity in position and 

 moderate elevation. 



The difference of temperature between Calcutta and Birbhoom, 



