. The Becquerel rays and the properties of radium . end a glass bulb. The larger bulb, «, contains influence. CommUni- zinc sulphide or other fluorescent materials. The arrangement is exhausted of air, and the emanation r>ofir>rp ■\xrifVl fllf» crlnVlP introduced through the stopcock, c, which is then Catmg Wlin ine ^lOUe ^.,^^^^, ^,^^ ^.^^ sulphide glowk brilUantly. On Kit o cl-irvvf +ril-40 ia immersing ?* in liquid air, the emanation all condenses,L>y d bllUl t tUUtJ IS and a loses its luminosity. When «< is allowed to heatanother small bulb Pag-n. the luminosity is restored. wh
. The Becquerel rays and the properties of radium . end a glass bulb. The larger bulb, «, contains influence. CommUni- zinc sulphide or other fluorescent materials. The arrangement is exhausted of air, and the emanation r>ofir>rp ■\xrifVl fllf» crlnVlP introduced through the stopcock, c, which is then Catmg Wlin ine ^lOUe ^.,^^^^, ^,^^ ^.^^ sulphide glowk brilUantly. On Kit o cl-irvvf +ril-40 ia immersing ?* in liquid air, the emanation all condenses,L>y d bllUl t tUUtJ IS and a loses its luminosity. When «< is allowed to heatanother small bulb Pag-n. the luminosity is restored. which can be immersed in liquid air. As soon asthis is done, all the emanation condenses in the bulb,so that there is none left in the large globe, and thezinc sulphide is no longer luminous. If the bulb isremoved from the liquid air, the emanation evaporatesagain, and the luminosity is restored. The emanation seems to be absolutely unaffectedby any chemical treatment that we can submit it even the most violent treatment, such as passing. 112 THE BECQUEREL RAYS it over red-hot magnesium, alters its radio-activity inthe shghtest. The only other known gases which canwithstand such treatment are the inert constituents ofthe atmosphere, which have been discovered of recentyears, helium, neon, argon, krypton, and xenon. Anyother gas, such as oxygen, carbonic acid, or evennitrogen (which is generally very inert), enters intochemical combination with red-hot magnesium. Inits chemical properties, or rather want of properties,then, the emanation resembles the inert gases. We have not yet any very satisfactory means ofdetermining with accuracy the density of the emana-tion. As has been already remarked, the volume ofpure emanation obtainable does not exceed that of apins head, and it will readily be admitted that toattempt to weigh such a quantity of gas would not bea very hopeful task. Sir William Ramsay and succeeded in determining the density ofxenon with only 7 c
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectradioac, bookyear1906
