Quantitative measurements were made of the absorption of light by oxygen, water vapor and crystalline quartz in the spectral region 1850 to 2300A, by means of a quartz spectraph and a recording densitometer. Defining the absorption coefficient α by I=I₀10^-αd where d is the distance in cms, values of α were obtained for oxygen at atmospheric pressure in tubes up to 5 meters in length, which showed the peaks of absorption due to the Schumann-Runge band system below 1970A. From 2000 to 2100A the absorption appeared continuous with no marked peaks, α being 0.00025, 0.00032 and 0.00050 at 2100, 2050 and 2000A respectively. The values of α for saturated water vapor at 25^∘{}C were 0.0005, 0.0013, 0.003 for wave-lengths 2050, 1950 and 1900A. For a specimen of crystalline quartz 2.5 cm thick α was found to be 0.086, 0.11, 0.13 and 0.17 for wave-lengths 2040, 2000, 1940 and 1870A.
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L. P. Granath (1929) studied this question.