. Carnegie Institution of Washington publication. 8 NUCLEATION OF THE UNCONTAMINATED ATMOSPHERE. coronas. Nuclei originating or lost at the left-hand end of the cham- ber will additionally distort the corona, and such distortion is clearly in evidence, apart from the one-sided position of the coronas. Mere inspection of the coronas (figs. 2-6) shows that they are larger for fog particles near the axis, and smaller for particles near the top and bottom of the condensation chamber. Hence it is next necessary to explain that the details of the distorted coronas observed actually correspond with a
. Carnegie Institution of Washington publication. 8 NUCLEATION OF THE UNCONTAMINATED ATMOSPHERE. coronas. Nuclei originating or lost at the left-hand end of the cham- ber will additionally distort the corona, and such distortion is clearly in evidence, apart from the one-sided position of the coronas. Mere inspection of the coronas (figs. 2-6) shows that they are larger for fog particles near the axis, and smaller for particles near the top and bottom of the condensation chamber. Hence it is next necessary to explain that the details of the distorted coronas observed actually correspond with a gradation of the number of effective or available nuclei, from the axis outward on all sides. In the case of linearly graded fog particles increasing in diameter, 8, from bottom to top, it appears that the equation of the apertures, s, of the loci* of like color of the corona is 2 a s0 sin <6 ~ _^_ ** • T ' ' a sin where s0 is the aperture for the particles of diameter, S0, in the horizon or plane of sight, and 8 the angle in polar coordinates between the radius vector to the part of the corona in question and the horizon- tal, the origin being at the center of the corona. Finally 8 = 80—ah. Such coronas when the gradation becomes marked are campanulate in outline, finally becoming FIG. j.—Computed curves. In the present case, however, there are two symmetrical distribu- tions of this kind, i. «?., increasing diameters of fog particles from the axis of the chamber toward the top and the bottom. Hence pairs of intersecting curves, two examples of which are given in figure j (a' > a), show the coronas to be anticipated, if the remote parts beyond b and c of the corona are ignored and only the stronger curves surrounding the spot of light, d, admitted. In other words, *Barus: Am. Journ. Sci. (4), XIII, p. 309, Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration a
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