The Absorption Coefficient of Solution for Monochromatic Radiation. 29 



lying on the edge of the red-yellow absorption band, for this edge is 

 extremely sharp compared to the edge of the analogous band of the 

 water solution. The A c curves for the region of transmission 764/z/z 

 to 92(V//, and for the edge of the infra-red band 920juju to 1,134/4*, 

 show that A for these regions of the spectrum remains approximately 

 constant for all concentrations. 



COBALT CHLORIDE IN ETHYL ALCOHOL. 



Four solutions were prepared varying in concentration from c=0.4 

 to c=0.1. A month later a second series of more dilute solutions, for 

 which c was 0.08, 0.06, 0.05, 0.04, 0.03, 0.02, 0.01, 0.005, were prepared; 

 their absorption curves were drawn only in the region of moderate 

 absorption, from 1,056/4* to 1,134/4* and for 724/4* and 704/4*; in the 

 other regions they either absorbed too much or too little, so that no 

 confidence could be placed in the values of A. 



.0500 



800 900 1.000 1.100 UPO 1.300 A' 



Fio. 7. The A-c and Absorption Curves for Cobalt Chloride in Ethyl Alcohol. 



