. The velocity and ratio e/m for the primary and secondary [Beta] rays of radium .. . r paper in th« latter. To find out tvhether tertiary rays were ceviablein a mapnetic field, the arranjenent shown diagramaticallyin fig. 11, ./as made use of. The rnercury screen A .vasplaced so that one end -vas directly over the ends of theebonite blocks a and b. The electroscope B was placednear to the edrie of the screen A, and had a v/indow ccovered with foil cut in one side, so that any raysmight enter without absorption. Iaen the screen c was placed in position the tertiaryrays prod
. The velocity and ratio e/m for the primary and secondary [Beta] rays of radium .. . r paper in th« latter. To find out tvhether tertiary rays were ceviablein a mapnetic field, the arranjenent shown diagramaticallyin fig. 11, ./as made use of. The rnercury screen A .vasplaced so that one end -vas directly over the ends of theebonite blocks a and b. The electroscope B was placednear to the edrie of the screen A, and had a v/indow ccovered with foil cut in one side, so that any raysmight enter without absorption. Iaen the screen c was placed in position the tertiaryrays produced could travel upv/ard and en«ter the electro-scope. .:0W by placinr tv/o screens, d and e, in the posi-tions indicated in thf^ figure, the rays could be pre-vented from entering the electroscope, but a portionwould still be able to travel upvard. .Vhen a magneticfield was applied in such a direction that linesof force v/ere perepndicular, and going into the planeof the paper, the ionization in the electroscope v/asnot appreciably altered, but when applied in the reverse. Radii (SS SSf Fis-II 28 directicn there vas observed an increase in , when a screen was placed so as to cut offentirely the tertJary rudiatitn fro^i LpIoat, thi- effectwas still observed but to a -^luch less de ree. These two^e^■ults indicated that thre was or e c en t ^ be si d e r: thetertiary radiation from below-a radiation which seemedto come from the -lercury near the /nndow of the electro-SCO e. This latter radiation is uidoubedly caused bythe y rays when they emerre from the surface of the mer-cury, and is the same as that observed u- Kve nher\ tne )rrave were pirtly absorbed by a thick block-of lead. i3yplacinp sheets of paper in front of tne window, it /asfoind that the penet ating pcver of this radiation wasmuch less than that of the tertiary; t sheets of papercut it down to 30^ , and It: sneets completely absorbed it. It >/as also obi-evred that .viien the mapnetic f
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectradioac, bookyear1906
