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Apparatus for the production, dispersion, and detection of soft fluorescent x-rays (10 to 50 Å) is described. The apparatus includes a new type of gaseous discharge x-ray tube capable of operating at 3000 v and 200 ma, a servo-type vacuum controller for maintaining constant x-ray tube current, and built-up films of heavy-metal soaps for use as analyzing crystals. Photographs are included of fluorescent spectral lines of carbon from graphite (Kα, λ=44.5 Å) and of copper (Lα, λ=13.3 Å) obtained, respectively, in 2 and in 4½ hr.

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Automatic equipment was needed for continuously measuring and recording the concentration of ozone in a stream of gas. This equipment was built and has been successfully operated for about 2 years. It depends upon the absorption by ozone of a selected band of visible light at odone concentrations in the range 0 to 10 mole % or higher. (.4t concentrations greater than 10 mole the absorption tube should be shielded as a safeguard against possible explo-HE commercial use of ozone in the United States is now a T reality ( 2 , S), and it seems probable that, ozone xi11 be used on a much larger scale in the future.\\-hen ozone is produced and used, it is desirable to have reliable equipment for continuously measuring ozone concentrations over the range from 0 to 10 mole % or higher in a stream of gas.Apparatus for this purpose has been described ( 7 , 9, I O ) , but the method given below is believed to be the simplest yet devised.