. Stellar radiometers and measurements of the energy distribution in the spectra of 16 stars . of screens: A, quartz; B, red glass; C, blue-purple glass red (see curve C, Fig. 3). Used as a screen this gives the spectralradiation between and Yellow Glass, Schotts Jena 5560, thickness mm, isopaque to radiations of wave lengths less than * (see curve A,Fig. 3). The infra-red transmission is not very abrupt. Henceit was used in combination with the water cell, giving the spectralradiation between and Red Glass, Schotts Jena 4512, thickness mm, is opaqueto
. Stellar radiometers and measurements of the energy distribution in the spectra of 16 stars . of screens: A, quartz; B, red glass; C, blue-purple glass red (see curve C, Fig. 3). Used as a screen this gives the spectralradiation between and Yellow Glass, Schotts Jena 5560, thickness mm, isopaque to radiations of wave lengths less than * (see curve A,Fig. 3). The infra-red transmission is not very abrupt. Henceit was used in combination with the water cell, giving the spectralradiation between and Red Glass, Schotts Jena 4512, thickness mm, is opaqueto radiations of wave lengths less than (see curve B, Fig. 2). Coblenfz) Stellar Radiometry 735 It was used in combination with, the water cell, giving the spectralradiation between ^t and The difference between the gal-vanometer deflection when the water cell is interposed and whenthe water cell plus the red glass are interposed (corrected forreflection) gives the radiation in the spectral region from Similarly, the difference between the galvanometer deflec-. Fig. 3.—Transmission curves of screens: A, yellow glass; B, pyrex glass; C, water, I cm in thickness tion for the water cell plus yellow glass and the deflection for thewater cell plus red glass represents the spectral radiation ^ and Pyrex Glass, Corning, thickness cm, terminates veryabruptly in its transmission at (see curve B, Fig. 3). How-ever, the sample used contained striae and it was used in themeasurements of the radiation from only one star. 93132°—22 3 736 Scientific Papers of the Bureau of Standards [ Glass, Corning, G 585, mm,when used in combination with the water cell gives the radiationin two high narrow transmission bands, at ^1 and ,respectively (see curve C, Fig. 2). Using in addition the above-mentioned red or yellow glass, the radiation in the spectral regionfrom ^ to is obtaine
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