ii4 



INFRA-RED EMISSION SPECTRA. 



/ 234 567 8 9M 



Fig. 8i. Uranium oxide (a); Thorium oxide (6); Cerium oxide. 



from that of the Auer mantle, being similar to that of the Nernst glower. 

 This is no doubt due to the greater thickness of the radiating layer, which 

 emits a more nearly saturated radiation in the region of i to 3 /<, as well 

 as in the remainder of the spectrum. 



0/234567 

 Fig. 82. Beryllium oxide (a); Silica (b), (c); Feldspar. 



