On the Influence of Color on Radiation. 



21 



Nature of Coating 



Cylinder No. 3. 

 No Coating. 



Chalk. 



Prussian blue. 



Litmus blue. 



Time in 

 seconds. 



Cylinder No. 5. 



AurumMusivum 



do. on another 

 occasion. 



do. 

 do. 

 do. 



do. 



Nature of Coaling. 



|Tiine in 

 I seconds. 



Cyhnder No. 1. 



1 28 1 f 1 1 .000 Sulphuret of antimony . 

 1300 1.014: 



909i|l.000j do. additional. 

 939T|l.034Coatingonanotheroccasion 



909,' 

 932; 



1.000 Red lead. 

 1 .025 



920', 

 956' 



892 

 893,', 



898' 



1 .000 do. blackened 



1.038 



by Sulphuretted Hydrogen 



937; 

 959 



9431 

 957 



818 

 820; 



850 

 860 



897 



851 



872i 



1.000 

 1.001 

 1.007 



1 .000 

 1.023 



J .000 

 1.014 



1.000 

 1.003 



1 .000 

 1.012 

 1.055 



1.000 

 1.025 



Cylinder No. 4. 



Gamboge. 

 Chromate of lead. 

 Vermilion. 

 Sulphate of Baryta. 



Cylinder No. 1. 



No coating. 



do. another occasion. 



do. 



849| 

 972^ 



87U 

 8784 



8861 

 89411 



911, 

 924 J 



932 



9m 



938J 

 954^ 



845 

 850 



1 .000 

 1.145 



1.000 

 1.008 



1.000 

 1.009 



1.000 

 1.014 



1.000 

 LOU 



1.000 

 1.017 



1. 000 

 1.006 



740^11.000 

 778 1.051 



13961 

 14251 

 14451 



1.000 

 1.020 

 1.035 



1313H-000 

 131511.002 



1303 1 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 

 under the same circumstances the results could readily be reproduced 

 within about two per cent. 



