Five of six vacuum tubes
Five of Six vacuum tubes used in work with radium emanation, used by Sir William Ramsay during his researches on the rare gases of the atmosphere.
Six vacuum tubes used in work with radium emanation, used by Sir William Ramsay during his researches on the rare gases of the atmosphere.
Five of Six vacuum tubes used in work with radium emanation, used by Sir William Ramsay during his researches on the rare gases of the atmosphere.
One of six vacuum tubes used in work with radium emanation, used by Sir William Ramsay during his researches on the rare gases of the atmosphere.