﻿Characteristic Curve of a Photographic Emulsion, 359 



where a and ft are constants. A comparison of the form of 

 this curve (fig. 5) and the curve in fig. 4 shows a difference 



Fiff. 3. 



i 



A 



► T 











O 





/ 



-" 





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/ 

 / 



/ 











/ 

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1 











I / 











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0-2 04 0-fc 0-8 1-0 



