. Carnegie Institution of Washington publication. i6 CONDENSATION OF VAPOR AS INDUCED BY NUCLEI AND IONS. I purpose, therefore, in the present paper, to study the same phenom- enon for an artificial barometer; in other words, to accentuate the present discrepancies, let the pressure drop from a given upper limit to varying lower limits, as well as from varying upper limits to a given lower limit. The results so obtained are enormously different for the same drop of pressure. Much of this would be anticipated; but the question nevertheless arises whether the colloidal nucleation of the gas is a
. Carnegie Institution of Washington publication. i6 CONDENSATION OF VAPOR AS INDUCED BY NUCLEI AND IONS. I purpose, therefore, in the present paper, to study the same phenom- enon for an artificial barometer; in other words, to accentuate the present discrepancies, let the pressure drop from a given upper limit to varying lower limits, as well as from varying upper limits to a given lower limit. The results so obtained are enormously different for the same drop of pressure. Much of this would be anticipated; but the question nevertheless arises whether the colloidal nucleation of the gas is actually dependent in so marked a degree on its initial pressure, or whether this dependence can be explained away. 74 76 78. 10 FIG. 4.—Apparent nucleation of dust-free air in lapse of time. Apparatus I with 4-inch exhaust pipes; apparatus II with 2-inch exhaust pipes; otherwise identical. A new and more pervious filter was installed on July n. The upper curve shows corresponding barometric pressure within the fog chamber. Later in the course of the work I made additional comparisons with the contemporaneous ionization of the air determined by Miss L. B. Joslin and with the temperature of the fog chamber as distinguished from the temperature of the air. These results as a whole finally showed that a direct dependence of the vapor nucleation of the dust-free air. 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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