Abstract

The advantage of the spectrophotometer over the eye, in giving a quantitative record for future reference or interlaboratory comparison, cannot be utilized effectively in some applications unless its accuracy corresponds to the closest tolerances in direct visual comparisons. Although negligible for some purposes, errors due to stray light in the commercial recording spectrophotometer are significant by this criterion. Specific recommendations are given for reducing the individual sources of stray light and for compensating the remainders by adjustment of the photometric scale.

© 1940 Optical Society of America

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