Abstract

A graphical analysis of the photographic exposure problem is given based on the assumption that the sensitivity variation among grains of a photographic emulsion depends upon an inherent variation in grain sensitivity among grains of the same size class as well as upon the size distribution. Using the graphical model developed, a theoretical equation of the H and D curve is derived. On account of the mathematical form, the equation cannot be integrated. It is necessary, therefore, to obtain the theoretical curves from this equation by graphical methods. Curves obtained by means of the equation are compared with experimental curves for three widely different types of emulsions, and the agreement is quite satisfactory.

© 1939 Optical Society of America

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