Abstract

A Western Electric ERPD Transmission Densitometer has been modified to permit the reading of diffuse reflection density values. The alterations do not interfere in any way with the original function of the instrument. Construction details of the reflection viewer added to the densitometer and the accompanying optical and electrical changes are discussed. Performance data are briefly summarized, including observations of density values in excess of 2.0 for certain glossy photographic papers.

© 1949 Optical Society of America

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