. Radio-activity : an elementary treatise from the standpoint of the disintegration theory . nths in the drysolid state, were employed. From the general analogy ofhelium to the radium emanation, both in chemical nature andthe phenomenon they exhibit of being occluded and of beingliberated by heat and solution, it was assumed that the heliumif produced would not escape from the radium compound untilit was heated or dissolved. The radium bromide Avas intro-duced into the bulb A which was then sealed at the dottedline M to the bulb B, carrying two taps. This was then com-pletely exhausted, the lo
. Radio-activity : an elementary treatise from the standpoint of the disintegration theory . nths in the drysolid state, were employed. From the general analogy ofhelium to the radium emanation, both in chemical nature andthe phenomenon they exhibit of being occluded and of beingliberated by heat and solution, it was assumed that the heliumif produced would not escape from the radium compound untilit was heated or dissolved. The radium bromide Avas intro-duced into the bulb A which was then sealed at the dottedline M to the bulb B, carrying two taps. This was then com-pletely exhausted, the loAver tap closed, and water, boiled free PROPERTIES OF THE RADIUM EMANATION. 159 from air, allowed to flow into B, The seal at the dotted lineN was then made. C is a tube in which is a thin copperspiral wire which can be heated by an electric current. D isa phosphorous pentoxide tube to absorb moisture. E is acapillary U tube which is cooled in liquid air during theexperiment. The emanation and any CO2 present are con-densed here and prevented from entering the spectrum tulie. To Pump ^M/. Fm. 37. The tap L is connected to the mercury pump not shown. Fis the spectrum tube shown half full-size at H. The copperspiral is first partially oxidised by filling the tube with oxygenfrom the burette G- and keeping the spiral at dull redness by acurrent. The whole apparatus is thoroughly exhausted andall taps closed. Water is now admitted from B into A, the 160 RADIO-ACTIVITY. radium bromide dissolves and gives up its occluded gases,which are admitted into C. The red-hot spiral absorbs thehydrogen and oxygen, and the water produced is absorbed inD, Mercury is now allowed to flow up from G, and the gasesforced into the spectrum tube through the cooled U spectrum on examination proved to be practically thecomplete spectrum of helium. In the next experiments the emanation from 50 mgs,of radium bromide (which had been kept in solution in aclosed vessel until practically the equilibriu
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectradioac, bookyear1904
