Ther.nul Radiation in Absolute Measure. 



553 



Fig. 3.— Curves showing- emission of heat from Pt, (bright) and Pt a 

 (sooted), from the same hank of wire, diameter 0-0542 centim., at 

 various temperatures. 



80 

























>% /<* 



**-m 



y 



t 







70 



m 



55 



1 

























/ 



/ 



/ 



/ 

































/ 











i 





















/ 



/ 











I* 



% 





















/ 



/ 













i 





















/ 













45 

 40 



« If 



53 



















/ y 



/ 













§ 8 

 §3 



<0 



















/ 

















1 















/ 



/■'/ 



/ 















30 

 25 



V3 vj 



8 















// 



/ 

















"* $ 



** 



13 















/ 





















* 















/ 

















H May\ 



cQ 



^ 

 s 





































§ 



































5 







































































50 100 150 ZOO 250 300 350 -400 450 500 550 600 650 700 750 300 650 

 TemperaCure in degrees Centigrade. - 



Phi!. Mag. S. 5. Vol. 49. No. 301. Jm 



1900. 



2Q 



