The London, Edinburgh and Dublin philosophical magazine and journal of science . f Excited Activity on the Anode. In order to throw more lio-ht on the cause of this distribu-tion of excited activity on the anode, some experiments weremade with the apparatus shown in fig. 2 a. The emanation vessel A consisted of a brass cylinder 25*5cms. long and 830 cms. diameter. A long central brass rodBCDE, diameter *518 cm., passed through an ebonite corkat one end of the tube. The outside cylinder was connectedto one pole of a large battery, the other pole of which wasearthed. The central rod was connecte
The London, Edinburgh and Dublin philosophical magazine and journal of science . f Excited Activity on the Anode. In order to throw more lio-ht on the cause of this distribu-tion of excited activity on the anode, some experiments weremade with the apparatus shown in fig. 2 a. The emanation vessel A consisted of a brass cylinder 25*5cms. long and 830 cms. diameter. A long central brass rodBCDE, diameter *518 cm., passed through an ebonite corkat one end of the tube. The outside cylinder was connectedto one pole of a large battery, the other pole of which wasearthed. The central rod was connected to earth. Theemanation was introduced into the vessel by sending a slowcurrent of air through a radium chloride solution contained * E. Rutherford arid Miss Brooks, Phil. Mag. July 1902. the Method of its Transmission. 107 in the Drechsel bottle F. The air passed through a tubecontaining cotton-wool, and through a drying-tube T ofcalcium chloride. The central rod was made of three remov-able parts BC, CD, DE, screwed together. After exposure ffiffTH _0 Emanation Crs. ind£R. Had. Cl for a known time in the presence of the emanation the rodwas removed, and the activity on the portion CD, length 15cms., determined by the electrometer in the cylindrical testingvessel L, shown in fig. 2 b. By this means the excited Fig 2 b. jc ffi 0ft etC ro- A -H £/)/}T/f r£ST/A/G CY/L/A/0£/? activity was determined on that portion of the rod where theelectric field was sensibly uniform. In most of the experiments the emanation was introducedinto the vessel A a day or two before observations were ensured a uniform distribution of the emanation through-out the cylinder by the process of diffusion. If observationswere required soon after the introduction of the emanation,the emanation was uniformly mixed with the air by means ofa stirrer not shown in the figure. Some experiments were made with this apparatus on theamount of excited activity on the central rod when positivelycharged f
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