. The London, Edinburgh and Dublin philosophical magazine and journal of science . assing through a particular number oflayers of different substances, both as measured electricallyand by the action of the rays on a photographic plate, varieswith the order of the layers. Table IV. Thorium Oxide. Thick layer. Screening effect of thick Aluminium foil. Plates 5 cm. apart. Lower plate 95 volts + Layers of foil. Time of 1G0 div. in see. Current. 0 16-0 1 187-0 1000 2 2000 93-5 3 2180 85-8 4 2430 770 5 1 277D 675 o Fig. 5.—Screening effect of Aluminium Oxide. Thick layer. 2 3 4 5 Layer
. The London, Edinburgh and Dublin philosophical magazine and journal of science . assing through a particular number oflayers of different substances, both as measured electricallyand by the action of the rays on a photographic plate, varieswith the order of the layers. Table IV. Thorium Oxide. Thick layer. Screening effect of thick Aluminium foil. Plates 5 cm. apart. Lower plate 95 volts + Layers of foil. Time of 1G0 div. in see. Current. 0 16-0 1 187-0 1000 2 2000 93-5 3 2180 85-8 4 2430 770 5 1 277D 675 o Fig. 5.—Screening effect of Aluminium Oxide. Thick layer. 2 3 4 5 Layers of Aluminium sheet. Sagnac, Journal de Physique, p. 9, Feb. 17th, 1899. 374 Prof. Owens on Thorium Radiation. Table V. Thorium Sulphate. Thick layer. Screening effect of thin Aluminium foil. Plates 5 cm. apart. Lower plate 95 volts + , Layers of foil. Time of 100 div. in sec. Current. 0 72-6 100-0 1 130-8 55-0 2 220-0 330 3 3430 210 4 518-0 14-4 5 767-0 9-5 6 1000-0 73 8 1420-0 51 12 1850-0 3-9 Fig. 6.—Screening effect of thin Aluminium Sulphate. Thick 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 layer.
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