The London, Edinburgh and Dublin philosophical magazine and journal of science . thin layer of radium passed upwards througha number of narrow slits, Gr, in parallel, and then through athin layer of aluminium foil 00034 cm. thick into thetesting vessel V. The ionization produced by the rays inthe testing vessel was measured by the rate of movement ofthe leaves of a gold-leaf electroscope B. This was arrangedafter the manner of C. T. R. Wilson in his experiments on * Phil. Magr. Jan. 1903, p. 113. It was long ago suggested by Strutt(Phil. Trans. Roy. Soc. 1900) that the a rays consist of positi
The London, Edinburgh and Dublin philosophical magazine and journal of science . thin layer of radium passed upwards througha number of narrow slits, Gr, in parallel, and then through athin layer of aluminium foil 00034 cm. thick into thetesting vessel V. The ionization produced by the rays inthe testing vessel was measured by the rate of movement ofthe leaves of a gold-leaf electroscope B. This was arrangedafter the manner of C. T. R. Wilson in his experiments on * Phil. Magr. Jan. 1903, p. 113. It was long ago suggested by Strutt(Phil. Trans. Roy. Soc. 1900) that the a rays consist of positively chargedparticles projected from the active substance. The same idea has latelybeen advanced by Sir Wm. Crookes (Proc. Roy. Soc. 1900). f The sample of radium of greater activity than that usually sold wasobtained from the Societe Cent rale de Produits Chimiques, through thekinduess of M. P. Curie. Electric Deviation of Rays from Radium. 170 the spontaneous ionization of air. The gold-leaf system wasinsulated inside the vessel by a sulphur bead C, and could be Fig. 1 B„. Outf)ouj of Hydroger charged by means of a movable wire D, which was afterwardsearthed. The rate of movement of the gold-leaf was observedby means of a microscope through small mica windows in the testing vessel. In order to increase the ionization in the testing rays passed through 20 to 25 slits of equal width, placedside by side. This was arranged by cutting grooves at regularintervals in side-plates into which brass plates were cross section of the system of metal plates and air-spacesis shown in fig. IB. The width of the slit varied in different experiments between042 and 1 cm. The magnetic field was applied perpendicular to the plaintof the paper and parallel to the plane of the slits. The testing vessel and system of plates were waxed to a lead N 2 180 Prof. E. Rutherford on the Magnetic and plate P so that the rays entered the vessel V only throughthe aluminium foil. It is nec
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Keywords: ., bookcentury1800, bookdecade1840, bookidlondon, booksubjectscience
