418 Messrs. Nichols and Snow on the Influence of 



Table XL — Keflecting-power of Artificial Ultramarine in 

 terms of that of the ideal White. Temperatures, 25°, 

 500°, and 773° C. 



Ware-lengths. 



Intensities 



Intensities 



Intensities 



Intensities 



at 25° C. 



at 500° O. 



at 773° C. 



(after heating). 



•7530 



0-028 



0-027 



0-037 



0-027 



•6685 



0-026 



0-021 



0-042 



0-021 



•5570 



0-012 



0017 



0021 



0021 



•4920 



0-081 



0042 



0-038 



0-080 



•4685 



0-195 









•4590 



0-243 









•4500 



0-224 



0-057 



0-048 



0124 



•4410 



0-232 









•4340 



0-179 









•4290 



0-145 









•4250 



0-118 



0-022 



0-020 





The curves for chromic oxide (fig. 12) present a peculiarity 



Fig. 12. 



Cn O x 



IT 



■*/*- 



sr- 



d £ 



D E F 



in the shifting of the maximum of reflecting-power from the 

 green into the yellow, which is not met with in the case of any 



