The London, Edinburgh and Dublin philosophical magazine and journal of science . fbESSURE. Table IV. Current. Pressure. Lower Plate-f. Lower Plate—. 10-7 60 +5-40 -132 7-8 +303 -10-3 56 +1-36 - 8-4 404 J( +0-09 - 72 2-92 20 to 60 -115 - 6-0 I 2-13 -1-60 - 5-44 1-51 „ —2 24 - 4-86 108 -2-80 - 4-58 0-50 2 —3-56 - 4-36 0015 0 -3-90 - 3-90 produced by the Corpuscles given out by Radium. 559Figs. 3, 4, and 5 show that the relation between currentand pressure is of the form y1=—c-{-mpwhen the lower plate is charged positively, and72= —c — mp when charged negatively, yx and y2 denoting the curre
The London, Edinburgh and Dublin philosophical magazine and journal of science . fbESSURE. Table IV. Current. Pressure. Lower Plate-f. Lower Plate—. 10-7 60 +5-40 -132 7-8 +303 -10-3 56 +1-36 - 8-4 404 J( +0-09 - 72 2-92 20 to 60 -115 - 6-0 I 2-13 -1-60 - 5-44 1-51 „ —2 24 - 4-86 108 -2-80 - 4-58 0-50 2 —3-56 - 4-36 0015 0 -3-90 - 3-90 produced by the Corpuscles given out by Radium. 559Figs. 3, 4, and 5 show that the relation between currentand pressure is of the form y1=—c-{-mpwhen the lower plate is charged positively, and72= —c — mp when charged negatively, yx and y2 denoting the currents, pthe pressure, and m and c positive constants. Fig. P/7ES5URE The interpretation of this result is very simple : we havenegatively charged corpuscles constituting the deflectableBecquerel rays travelling from PP to pp at a rate independentof the pressure, on their way they produce equal numbersof positive and negative ions in the gas, the rate of productionbeing proportional to the pressure. Let N0 be the number of corpuscles passing per secondthrough L and e the charge carried by a single corpuscle,then the current due to the corpuscles alone is — N0. Suppose that each corpuscle makes a collisions in traversingone cm. of the gas at a pressure of one mm., let p be thepressure, d the average distance travelled by the corpuscles ingoing from PP to pp, and e the charge carried by the ions generated in the gas. 2 P 2 560 Specific Ionization produced by Corpuscles of Radium. When the lower plate is charged positively pp will collectpositive ions from the gas, and the total current will be y1 = — N0e + ^Qefapd. When the field is
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