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Document Type

Research

Abstract

In 1890 Hurter and Driffield proposed the following equation for the density "D" of a photographic plate exposed for a time "t" to light of constant intensity: D = 1/a Loge (b-[b-1] e-ct) where "a", "b", and "c" are parameters.

Publication Date

1920

Journal Title

Proceedings of the Iowa Academy of Science

Volume

27

Issue

1

First Page

223

Last Page

224

Copyright

©1920 Iowa Academy of Science, Inc.

Language

en

File Format

application/pdf

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