504 D r - Herschel's Experiments on the solar, and 



Black satin. While muslin scattering. 



o' 78 78 



5 8o| 8oi...2|:2i- = 1,050 



So that, notwithstanding some little difference in the appa- 

 ratus, or other unavoidable circumstances, the black object 

 gave again the greatest scattering of heat ; and consequently, as 

 no colour can be more opposite than black and white, colour 

 can have no concern in the laws that relate to the scattering of 

 heat. 



21 ith Experiment. 



I wished now to try some experiments of the scattering power 

 of metals, and had some plates of iron, brass, and copper, two 

 inches square, set flat, and smooth-filed, by round strokes. 



Iron.' Copper scattering. 



°' 74 73* 



5 7H 77i---4i:4T = »9 1 7 



213^ Experiment. 



Tin foil. Gold-leaf paper scattering. 



o' 74 74 



5 77i 79f---3i-5f= 1.500 



But the tin foil was considerably tarnished. 



214^/6 Experiment. 



Finding the form of the last experiments inconvenient, for 

 want of a standard, I had recourse again to white paper. 



White paper. Tin foil scattering. 



o' 5o£ 52 



5 53i 54* - - • 3i '- »i = » 88 5 



This substance scatters 885 rays of heat, and 8483 of 

 light. 



