Abstract

A definition of relative photographic efficiency is given on the basis of the fractional-gradient method of measuring speed (American Standard Z38.2.1-1947). An experimental method of making efficiency determinations accurately on this basis is described and values are given for incandescent tungsten at various temperatures and for commercial tungsten, fluorescent, and mercury lamps as well as for the three CIE illuminants and some natural sources. These values are given for typical non-color-sensitized, orthochromatic, and panchromatic materials.

© 1953 Optical Society of America

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Dorothy Nickerson
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