io8 



INFRA-RED EMISSION SPECTRA. 



Zirconium Oxide (Zr0 2 ). 



(Rod 5 by 1.4 mm. Energy consumption, 3.5 (ooo), 4.8, 5.8, 7.5 watts, curves 



a, b, c, d, fig. 77; 9.6, 1 2.1, and 14.5 (1400 ) watts, curves a, b, c, fig. 78.) 



The specimen examined was a fragment from a furnace wall. It 

 probably contained some "binder," although from the curve for the pure 



material (fig. 79) the foreign substance contributed but little to the emission 

 bands. The fine platinum terminals were wound around the ends of the 

 rod which was about 10 mm. long (5 mm. between the terminals). 



The curves are conspicuous for their sharp emission band at 4.3 fi, 



