The need for unification of density measurements made in numerous and widely separated laboratories led to the development of the Eastman Electronic Densitometer, Type 31A. This densitometer reads diffuse densities of color films from 0.0 to 4.1 through narrow-band color filters, with a standard deviation of ±1% among different instruments. The construction and performance of the densitometer are described.
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K. G. Macleish (1953) studied this question.
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