336 



Table 355 



RELATIVE BLUE BRIGHTNESS, B, AND BRIGHTNESS IN CANDLES PER 



CM.2 C, OF SOME INCANDESCENT OXIDES AT VARIOUS RED (0.665 M ) 



BRIGHTNESS TEMPERATURES, S R 



Sr = 



Material B 



Black body 026 



Tungsten 038 



Urania, gas air and oxy-gas . . . .028 



Ceria, pure : Oxy-gas 035 



" , yellow : " 032 



" , brown : " 033 



Oxides of Ce group : Oxy-gas. .031 



Neodymia : Oxy-gas 032 



Lanthana : " 033 



Erbia : " 047 



Yttria, pure : Oxy-gas 067 



" , 95% pure: " 047 



Zirconia : Oxy-gas 058 



Thoria : " 033 



Alumina : " 076 



Beryllia: " 086 



Magnesia : " 21 



Thoria 1% ceria: Oxy-gas... .078 



" urania : ... .069 



" trace urania : " ... .059 



" 1 % neodymia : " ... .046 



" " Mn oxide : " ... .035 



1500 



C 



0.79 



1 

 1 

 1.04 



LIS 



97 

 17 

 11 



7i 

 18 

 20 

 73 

 44 

 45 

 62 



4 



45 



33 



33 



43 



13 



1700 

 B 



0.27 

 .41 

 •31 

 •32 

 ■32 

 ■30 

 •34 

 ■33 

 •34 

 •45 

 .61 

 .46 

 •55 

 .56 

 .87 

 .99 



I-3I 



.70 



.67 

 .68 



•43 

 ■37 



C 



5-0 



5-9 

 6.6 



6-3 

 7-1 

 6. 7 



6-3 

 6.9 

 6.6 

 8.1 

 7-3 

 7-3 

 3-6 

 7-5 

 9-4 

 9-7 

 11.0 

 8.6 

 8-3 

 8.3 

 7-i 

 6.1 



1800 

 B C 



0.74 

 1. 11 



.84 



.83 



.85 



.83 



.92 



.92 



.89 



1. 17 



1.56 



1.19 



1-43 



1.40 



2.5 

 2.8 

 2.8 

 1.71 



1.77 



1-93 

 1. 14 

 1.01 



11. 



14- 

 15- 

 14. 

 17. 

 15- 

 14. 



15- 

 15- 

 16. 



17- 

 16. 

 8. 

 16. 

 22. 

 22. 

 22. 

 19. 

 19. 

 19. 

 15. 

 13- 



1900 

 B 



1.80 

 2.7 

 2.0 

 1.9 

 2.0 

 1.68 

 2.3 



2.3 



2.1 

 2.7 

 3-6 

 2.8 

 3-3 

 3-1 

 6.1 

 6.9 

 5-6 

 4.1 



4-i 

 4.8 

 2.6 

 2.4 



C 

 23. 

 33- 

 35- 

 31. 

 40. 



33- 

 33- 

 33- 

 33- 



33- 



32. 

 36. 

 IS- 

 32. 

 49- 

 49- 

 43- 

 43- 

 44. 



44- 

 29. 

 28. 



2000 

 B C 



3-9 

 6-3 

 4-5 

 4.0 

 4.0 



3-5 

 5-0 

 5-0 

 4-5 

 5-6 

 7-3 

 5-9 

 7.0 



6.3 



13-6 103 

 15-4 104 



10.2 

 8.4 

 8.7 



10.5 



5-5 

 5-3 



Note. — 1 microcalorie through 1 cm 2 at 1 m = 0.034 sperm calorie = 0.0385 Hefner unit 

 (no diaphragm) =0.043 Hefner unit (diaphragm 14X50 mm). Coblentz, Bull. Bur. of 

 Stds., 11, 87, 1914. 



Smithsonian Tables 



