. Carnegie Institution of Washington publication. 26 VAPOR NUCLEI AND IONS. 19. The same, continued.—The other characteristic, which was entirely unforeseen, is the relative absence in what has been called the ionized region (placed in the former curves, fig. 15, between about dp = 21 and dp = 26). The contrast is clearly shown in fig. 19. The only ex- planation which suggests itself to me is this, that what were supposed to be ions were really water nuclei due to the somewhat slower exhaus- tion of the preceding experiment. In other words, particles caught at the end of the somewhat less rapi
. Carnegie Institution of Washington publication. 26 VAPOR NUCLEI AND IONS. 19. The same, continued.—The other characteristic, which was entirely unforeseen, is the relative absence in what has been called the ionized region (placed in the former curves, fig. 15, between about dp = 21 and dp = 26). The contrast is clearly shown in fig. 19. The only ex- planation which suggests itself to me is this, that what were supposed to be ions were really water nuclei due to the somewhat slower exhaus- tion of the preceding experiment. In other words, particles caught at the end of the somewhat less rapid expansion evaporated into the larger particles, leaving water nuclei behind. But apart from this, the definite trend with which the curve reaches the abscissa is characteristic, and, so far as coronas go, there seems to be an absence of nuclei below dp = 24. In other words, the fog limit has been raised,in spite of the general lower- ing of the necessary supersaturations throughout the curve. The new curve is almost wholly coronal. + — .52 wPcor. 18 ZO ZZ ZA Z6 28 30 32 31 36 38 40 42 Fig. 19.—Improved fog chamber. Apertures of coronas (s) seen in dust-free air, energized or not, as stated, by radium or X-rays, at different exhaustions (dp). Table 10. Usually the same results are obtained in a pressure-increasing and in a pressure-decreasing series. There is an equally striking uniformity in the lapse of Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Carnegie Institution of Washington. Washington, Carnegie Institution of Washington
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