848 AinsrUAL REPOBT NATIONAL ADV3SOBY COMMITTEE FOB AERONAUTICS. … ft Fioube 8.—Curves showing the variation In the brightness of two tubes of dry radium luminous material. The material rep- resented by curve 18 contained 0.10 mg. of radium (element) per gram of material, that represented by curve IB contained 0.15 mg. of radium per gram.
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