. The London, Edinburgh and Dublin philosophical magazine and journal of science. btainedwhen the angle of inclination was 45° are in Table Landplotted in the curves of rig. 2. Table I.—Ionization vessel inclined 45° to the horizontal. Ratio of the ionization due to multiple reflexion alone to the ionization of the incident rays. lip iii ^ (from curves). gauss cm. Pb. Cu. C. 1164 0-56 0-25 002 2-56 1372 094 2-38 1700 0-53 o:ib 225 2072 1-36 0-23 2-08 2480 T57 0-78 0-26 1-91 2920 1-60 0-77 027 2-04 3400 1-64 2-04 3900 1-64 0:77 026 2-08 4340 160 2-05 4720 1-58 0-77 025 210 5000 156 022 212 5380
. The London, Edinburgh and Dublin philosophical magazine and journal of science. btainedwhen the angle of inclination was 45° are in Table Landplotted in the curves of rig. 2. Table I.—Ionization vessel inclined 45° to the horizontal. Ratio of the ionization due to multiple reflexion alone to the ionization of the incident rays. lip iii ^ (from curves). gauss cm. Pb. Cu. C. 1164 0-56 0-25 002 2-56 1372 094 2-38 1700 0-53 o:ib 225 2072 1-36 0-23 2-08 2480 T57 0-78 0-26 1-91 2920 1-60 0-77 027 2-04 3400 1-64 2-04 3900 1-64 0:77 026 2-08 4340 160 2-05 4720 1-58 0-77 025 210 5000 156 022 212 5380 T53 0-71 212 5720 o:i*8 6040 1:46 0:64 2V12 6320 1-42 2-22 6600 1-33 0:67 o:ie> 2-18 6850 1-31 ... 2-11 7080 1-31 229 7280 1-15 0:64 0-21 2-30 7480 1-20 2-34 7660 1-08 2-36 2*18 mean Homogeneous ^-Particles of Different Velocities. 869 The first column gives the values of Up. The followingthree columns give the ratio of the ionization produced bymultiple reflexion to the ionization produced by the incidentrays for lead, copper, and carbon respectively. The last Ffc. 2700 3600 4500 Hp in gauss cm. 8100 column gives the ratio of the values for lead and copper asobtained from the smooth curves. This ratio is roughlyconstant, indicating that the changes of reflexion with thevelocity are proportional for the two substances. The ex-periments with carbon were difficult on account of its weakreflecting power, and the results are consequently subject togreater errors than in the case of the other two experiments with an angle of 30° for the inclination ofthe ionization vessel with the horizontal were tried with leadonly, and the results were materially the same as for 45°inclination. For the very slowly and very rapidly moving/3-particles the experimental errors are greater on accountof the fact that the /3-ray effect is small compared withthe 7-ray effect, since the distribution of the number of/3-particles with the velocity gives a maximum and decreasesqui
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