ON THE RADIATION OF CALORIC 



185 



In ocquilibrio. 



Fig. 4. 



O 



T 



When heated. 



B 



(p - n - n fp - f) - n 



1 reflects >- radiates, J- A reflects >■ radiates V- 

 (B - \) - I) IB - i) - l) 



- 1 



*t 



adiates >■ sum > excess above the equilibrium 

 1| J - 



When cooled. 



fp - n - n - i) n 



•J reflects V radiates V sum V defect from the equilibrium v 



;} 



Fig. 5. 



II 

 O 

 p 



o 



B 



In cequilibrio. 



f p a - o ■ o 



■< reflects V radiates }- 

 IB - ij - fj 



A acts as 1 



When A acts as % 



( p n - O - n - if} - en 



■j reflects V radiates J. sum > defect from 2 -J [■ 



When A acts as f . 



i p „■ - o - n - ro 



■< reflects £- radiates J- sum V excess above i ■< V- 

 l B " J - i) - ii - If i 



VOL. IX. P. I. 



a a 



XII. 



