. The London, Edinburgh and Dublin philosophical magazine and journal of science. not homogeneous. Recently, however, v. Baeyer and Halm ||, using a photo-graphic method, have shown that the ft rays from severalradioactive products initially possess a considerable degree ofhomogeneity. We have no definite evidence so far that the * Communicated by Prof. E. Rutherford, Wilson, Proc. Roy. Soc, A. lxxxii. 1909, p. 612.|% Crowther, Proc. Camb. Phil. Soc. xv. pt. v. p. 442.§ Wilson, Proc. Roy. Soc, A. lxxxiv. 1910, p. 141.|| v. Baeyer & Halm, Phys. Zeit. xi. 1910, p. 488. the /3 Rays from a
. The London, Edinburgh and Dublin philosophical magazine and journal of science. not homogeneous. Recently, however, v. Baeyer and Halm ||, using a photo-graphic method, have shown that the ft rays from severalradioactive products initially possess a considerable degree ofhomogeneity. We have no definite evidence so far that the * Communicated by Prof. E. Rutherford, Wilson, Proc. Roy. Soc, A. lxxxii. 1909, p. 612.|% Crowther, Proc. Camb. Phil. Soc. xv. pt. v. p. 442.§ Wilson, Proc. Roy. Soc, A. lxxxiv. 1910, p. 141.|| v. Baeyer & Halm, Phys. Zeit. xi. 1910, p. 488. the /3 Rays from a Thick Layer of Radium E. 871 rays from such thin layers as they used are absorbedaccording to an exponential law. Gray * by the same method showed that the /3 rays froma thick layer of radium E are distinctly heterogeneous,although they are absorbed according to an exponential lawby aluminium. In view of the experiments of v. Baeyer andHahn the following experiments were performed. The apparatus is shown in fig. 1 and is similar to thatused by Wilson (loc. cit.). Fig. The rays from the radium E which was placed at B couldpass through a hole in a lead block A and into a magneticfield perpendicular to the plane of the diagram. They werebent round in circular paths and passed through holes 0and P in lead screens into an electroscope E. The meanradius of the path of the rays was 4 cm. and the diametersof the holes 0 and P *8 cm. The ionization in the electro-scope was determined for several strengths of the magneticfield, and the results obtained are shown in fig. 2 a, wherethe ionization in the electroscope is plotted against theproduct of the field strength and the radius of curvature ofthe path of the rays. If the rays were homogeneous andthe holes 0 and P and the source infinitely small, we shouldonly get ionization in the electroscope for one definitestrength of field. Experimentally however, even if the * Gray, Proc. Koy. Soc, A. lxxxiv. 1910, p. 136. 872 Messrs. Gray a
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