On the Influence of Color on Radiation 



21 



Nature of Coating. 



Cylinder No.~3 

 No Coating. 



Time in 

 seconds. 



Chalk. 





Prussian blue 



Ratio. 



Nature of Coaling. 



l^X. *** 



\ 



Cylinder No. 1. 



1281f 1.000 Sulphuret of antimony. 849-J 

 1300 1.014 972£ 



Litmus blue 



Cylinder No. 5. 



Aurum Musivum 



i 



r 



do. on another 



occasion. 





do. 





do. 



do. 





909i| 1.000 



1.000 

 1.145 



do. additional. 





939ri 1. 034 Coatirjgonanuther occasion 



87 1 U .000 



878^ 



1.008 



i 



909 | 1.000, Red lead. 

 932 \ ; 1 .025 



920 



956 





1.000 



do. blackened 



1.038 by Sulphuretted Hydrogen 



886 J 1 .000 

 894 1 1 .009 



892 1.000 

 893| 1.00 1 



898 1.007 







Cylinder No. 4. 



91 U! 1.000 

 924| 1.014 



Gamboge. 



1.000 

 1.011 



937' 1. 000 



959 



943? 

 957 



1.023 



Chromate of lead. 



818 

 820? 



1.000 

 1.014 



1.000 

 1.003 



Vermilion. 



1" 



Sulphate of Baryta. 740^*1.000 



778 1 1.051 



850 1.000 



Cylinder No. 1. 



860 



897 



1.012 

 1.055 



No coating. 



851 1.000 

 872? 1.025 



do. another occasion. 



1396i 1.000 



1425^ 1 



144511 



.020 

 .035 



1313} 1.000 

 13l5i 1.002 



do. 





1303 1.000 

 1320 1.013 



In the foregoing table, ten of the ratios are about 1.01 to 1, six 

 1.02 to 1, three 1.03 to 1, one 1.04 to 1, and two 1.05 to 1 : it is 

 therefore fair to infer that the single ratio of 1.14 to 1 results from 

 an error of record or observation, and the table fully shows, that 



within about two per cent. 



repro 



