On the Influence of Color on Radiation 



27 



The following table presents the comparison , the substances being 

 arranged in the order of their radiating powers. 



4) 



1 



2 

 3 



4 

 5 



6 



7 

 8 



9 



Nature of Coating. 





Color. 



Humus blue, 

 Prussian blue. 



Ammoniacal Sul- 

 phate of copper, 



Per-oxide of man- 

 ganese. 

 India ink, 



Bi-chromate of po- 

 tass a. 



India ink. 



Alkanet, 



t Carbonate of lead in 



\ oil of lavender, 

 lOSulphuret of lead, 

 11 Alkanet blue, 



Carbonate of mag- 

 nesia, 



( Carbonate of lead in 



( gum, 

 14|<Jarbonate of lime, 

 15 Vermilion, 



IGJSulphate of baryta, 



Blue, 

 Greenish blue, 



Brownish black, 

 Black, 



Brown, 

 Black, 



Crimson, 



White, 





No.S 

 3 



Date. 



Oct. 



31 

 25 



2,'Nov. 6 



12 

 13 



17 



Golden sulphuret 

 antimony, 

 18jFndigo, 



19 Cochineal, 



20 Red lead, 



21 Sulphate of baryta. 



of 



22 



Plumbago, 



23jChromate of lead. 



24 

 25 



Gamboge. 



\ 



Bi-sulphuret of tin. . 



White, 



White, 



ingy white, 

 Red, 



White, 



Brown, 



Blue, 



Crimson, 

 Orange, 



White. 

 Black, 

 Yellow, 

 Olive green, 

 Yellow, 



- 



2 

 3 



3 



3 



3 



3 



3 

 3 



3 



1 



3 



1 



4 



1 



11 



Oct. 13 



11 



25 



2 Nov. 11 



4 

 1 

 4 



1 



4 



1 



17 

 6 



c fc* 



see's. 



7w 



729 



Remarks on 

 surface. 



Rough. 

 789 Rough. 



18 804 



17 804 



1 810 



18 817 

 - 11 828 



21 830 



21 837 



Not shining, 

 but uniform. 

 Not smooth. 

 Streaked, 



streaks 



smooth. 

 Smooth. 

 Not shining, 

 but uniform. 

 Smooth, not 

 shining. 



838 

 846 



21 864 



865 



872 



Nov. 15 873 

 Oct. 31 909 



912 

 944 



6 952 

 21 1 957 



9 





977 

 1 2011005 j 



5lOet. 3111085 



Rough. 

 Smooth. 



Medium. 

 Smooth. 

 Rough, blue- 



ish white. 

 Smooth, in 



streaks. 

 Smooth. 

 Smooth. 

 Smooth. 

 Medium. 

 Not shining, 

 but uniform. 

 Smooth. 

 Smooth, in 



streaks. 

 Smooth. 





The results thus exhibited are decidedly unfavorable to the specific 

 effect of color in determining the radiating powers of bodies. Blue 



& 



occurs 



eighteenth place. Although the first seven numbers are blue or 

 black, the ninth, tenth, eleventh, and twelfth, are white, black, blue, 

 and white respectively. Red occupies the eighth and nineteenth pla- 

 ces, and then an intermediate one, namely, the fifteenth. White is in 

 the greater number of cases in the middle part of the table, ranging 

 close to black. 



