SELF-LUMINOUS MATERIALS. Fioubi 8.—Curve showing the variation In the brightness of a tube of dry radium lomlnom ma- terial containing 0.33 mg. of radium pet gram. … Fioue« 7.—Curve showing the varfaHoa in the brightness of a tube of dry radium luminous material ffnnfarntm 0 Jfl mg. of radium per gram.
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