. The London, Edinburgh and Dublin philosophical magazine and journal of science . 5 6 7 Layers of foil. 11 12 13 Prof. Owens on Thorium Radiation. Table VI. Thorium Nitrate. Thick layer. Screening effect of thin Aluminium foil. Plates 5 cm. apart. Lower plate 95 volts 4-, 375 Layers of foil. Time of 100 div. in sec. Current. 0 62-4 100-0 1 107-4 58-0 2 183-2 340 3 264-6 22-0 4 429-0 14-5 5 6420 9-7 6 899-0 7-0 8 1220-0 50 12 11930 4-1 Fig. 7.—Screening effect of thin Aluminium Nitrate. Thick 5 6 7 Layers of foil. 376 Prof. Owens on Thorium Radiation. A similar phenomenon
. The London, Edinburgh and Dublin philosophical magazine and journal of science . 5 6 7 Layers of foil. 11 12 13 Prof. Owens on Thorium Radiation. Table VI. Thorium Nitrate. Thick layer. Screening effect of thin Aluminium foil. Plates 5 cm. apart. Lower plate 95 volts 4-, 375 Layers of foil. Time of 100 div. in sec. Current. 0 62-4 100-0 1 107-4 58-0 2 183-2 340 3 264-6 22-0 4 429-0 14-5 5 6420 9-7 6 899-0 7-0 8 1220-0 50 12 11930 4-1 Fig. 7.—Screening effect of thin Aluminium Nitrate. Thick 5 6 7 Layers of foil. 376 Prof. Owens on Thorium Radiation. A similar phenomenon was observed with thorium over a thick layer of thorium oxide a layer of paperand on the paper a layer of aluminium foil, a certain con-duction-current was obtained; on reversing the layers thecurrent was reduced to nearly one half. A number of othercombinations were tried which also showed the effect in amarked manner. 6. Effect of Suspended Particles in the Path of the Con-duction-Current.—A thick layer of thorium oxide coveredwith one layer of aluminium foil was placed on the lowerplate in fig. 1, and the conduction-current measured when ithad become constant. The enclosing box was then iilled with tobacco-smoke andthe current again measured, and found to be about onequarter of its former value. A similar result was obtainedwhen the sulphate was used instead of the oxide. As thesmoke gradually settled or disappeared, the current steadilyrose to its first value. The ions in their pas
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