Sets of five colored‐glass filters, identified as Standard Reference Materials 2101 through 2105 and intended for checking the performance of spectrophotometer‐integrator systems, have been issued by NBS for many years. Highaccuracy transmittance measurements were performed on a set of the colored filters designated Master Set No. 3 by using a reference spectrophotometer constructed at NBS. A comparison of the new values with the original data obtained in 1962 for Master Set No. 3 shows agreement to within the experimental uncertainties of the 1962 measurements.
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Eckerle et al. (1977) studied this question.
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