Abstract

A sensitometer is described which affords a continuous variation of illumination across the sensitive surface. Two intensity-ranges are available, using the same source of light and the same exposure-time; with both ranges, the instrument can give an over-all variation of intensity in the ratio 2000 : 1. No lenses or moving parts are needed, and the sensitometer is strictly neutral with regard to wave-length.

© 1939 Optical Society of America

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