. Relative spectral transmission of the atmosphere . u/ opt yoyyjuiNVisia oj. ^. To test for the effect of stray light, carefully calibrated coloredglasses were inserted in the direct beam in place of the sectored * Nichols and Merritt, Phys. Rev., 31, p. 502; 1910. 382 Scientific Papers of the Bureau of Standards [Voirf discs above. The transmission of these glasses had been carefullymeasured by several methods 3 and was very accurately results of these observations are shown in Fig. 5, where thetransmission of several such glasses, as indicated by the apparatusused here, is shown b
. Relative spectral transmission of the atmosphere . u/ opt yoyyjuiNVisia oj. ^. To test for the effect of stray light, carefully calibrated coloredglasses were inserted in the direct beam in place of the sectored * Nichols and Merritt, Phys. Rev., 31, p. 502; 1910. 382 Scientific Papers of the Bureau of Standards [Voirf discs above. The transmission of these glasses had been carefullymeasured by several methods 3 and was very accurately results of these observations are shown in Fig. 5, where thetransmission of several such glasses, as indicated by the apparatusused here, is shown by dots and circles, while the correspondingaccurately known values are indicated by the full-line curves. Ared color screen for wave lengths 660 mix and longer was used,because there was considerable stray light in this part of the spec-trum. The results of these tests showed the general reliabilityof the performance of the spectrophotometer. Much more dataof this kind were accumulated during the beginning of the work, / y CD a0 uCSO ? /*/ 0 iv $?-: z0 £ /s CO Z<
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