70 



Mr. James Rice on 



are not perfectly reflecting for any qualities of radiation, a con- 

 clusion which can be arrived at theoretically, and is substantiated 

 by experiment. The results of the analysis of such full radiation 

 and the amount of energy within defined limits of frequency or 

 wave-length are indicated in the slide* which give curves for a 



Spectral Energy Curves of Full Radiation. 

 (Lummer and Pringsheini). 



Fia. 4. 



variety of temperatures, the horizontal lengths being taken as 

 proportional to wave-length, instead of frequency. When drawn 

 so as to make the horizontal lengths proportional to frequency. 



Fig. 4, 



