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Show Getting Powerful Gas From Radium m wit? QQJl mV !-QiK i "II iff'' ' II 1 ? -'t dT 1 Dr. D. C. Bardwell of the research laboratory of the United States bureau of mines. Department of the Interior, collecting gaseous radium emanation. The radium Is contained In the little safe at the right of the picture. Collections Collec-tions are made at intervals of from four to ten days.' The gas is drawn off under vacuum and purified by an electrical and chemical method, and finally by liquid air refrigeration. The purified gas, very small ln volume but powerful power-ful In Its action, is used In the study of gas reactions. |