. Carnegie Institution of Washington publication. MISCELLANEOUS EXPERIMENTS. A few rain limits were incidentally tested, as the opportunities were exceptionally good. These data are given in part III of the table. They have the usual values in my work, dp/p = ^ orvl/v=, and lie below Wilson's values. 40. Distance effect.—A few experiments wyere incidentally made to determine the effects of the distance D of the radium from the fog chamber in terms of the numbers of ions produced per second, a, where a = bri2 + cn, as above explained. The method of two sources (chord 5) with the coronas
. Carnegie Institution of Washington publication. MISCELLANEOUS EXPERIMENTS. A few rain limits were incidentally tested, as the opportunities were exceptionally good. These data are given in part III of the table. They have the usual values in my work, dp/p = ^ orvl/v=, and lie below Wilson's values. 40. Distance effect.—A few experiments wyere incidentally made to determine the effects of the distance D of the radium from the fog chamber in terms of the numbers of ions produced per second, a, where a = bri2 + cn, as above explained. The method of two sources (chord 5) with the coronas in contact was used. Table 18 shows the chief results. TABLE 18. —Distance effect. Radium I to V. Barometer ; temperature °. D from axis of fog chamber. Air, 5= 8p3=; dp/p3 = ; 6=io~9; 0 = D 5 io~3X« io-"X n-D* (i + c/bn) D S io-3Xw io-"X n2£>2 (i+c/bn) *;.o 4 i74 1784 IOO 30 13 4630 73 167 1656 3° 13 4630 73 167 1656 200 22 7200 20 59 92 4720 22 7200 61 104 5800 7 72 165 1612 50 45 4i 7800 44 38 6975 *Radium tube lies on the glass vessel, 7 cm. from the axis. Inferring that w2D2(i + c/6w) should be constant, the following com- parison results: D = 7 20 50 loo 200 cm. 10—l2w2Z?2 (i + ) =* At D — 7 cm. the radium is too close for any law. The agreement there- after is an attempt at constancy in so far as the small coronas beyond D < TOO cm. admit. 41. Attempt to calibrate the fog chamber with 5 separate sealed tubelets (I, II, III, IV, V) of radium.—These results are given in table 19. The tubes were placed in a gutter on the outside of the chamber at a dis- tance D, or in a sealed aluminum tube within the chamber. The table gives the aperture 5 (two sources of light), the nucleation n com- puted therefrom and the number of ions a generated per second, where a = bnt-\-cn as in the preceding Please note that these images are extracted from scanned page images that may have been
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