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Mechanical theory of solar corona
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CURRENT ToPics.
per cent. solutions. Fine dust is much more difficult to wet than coarse dust. The most efficient wetter and binder is a mixture of water-glass (sodium silicate), a resinous liquid soap (in 5 per cent. solutions), and commercial carbolic acid in the proportions Io: I: I. Dust thus treated is only inflammable with difficulty. Mechanical T h e o r y of Solar Corona. J. A. MILLER. (Astrophys. xxxiii, 3 o 3 . ) - - T h i s paper gives the results of an investigation of the streams of the 19o 5 solar corona, undertaken with the intention of applying Schaeberle's mechanical theory. With a few slight modifications of the original assumptions, the main criteria were taken as considering the streams of the corona to be the projections, on a plane, of streams of particles, the motions of which are produced by ejection, modified by the rotation of the sun, by its attraction, and by the pressure of its radiation. The tests were made by careful measurements of the curvatures of the streamers recorded on the Lick Observatory eclipse photographs. In many cases the actual forms observed were in very close agreement with those calculated from the theory. One notable feature is the persistence with which the convex edge of a streamer is sharply defined, while the other is diffuse. The calculations also agree with the actual photographs in showing that the farther from the equator at which a streamer originates, the larger will be the eccentricity of the orbits of the particles composing the stream. The shape of the streamers will be a function of the inclination of the sun's axis to the line of sight.
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Action of the R a d i u m E m a n a t i o n on T h o r i u m Salts. MESSRS. HERSCHFINKEL. (Mon. Sci., 838, 7 o 4 . ) - - T h e c~hclusions are that the action of the radium emanation on thorium nitrate is not a phenomenon of atomic transformation, but of oxidation; for an oxidizer, such as potassium permanganate, also produces carbon dioxide, but in larger quantity than the radium emanation. The production of this acid, then, is not due to the transformation of an atom of thorium into carbon, as Ramsay thought, but doubtless results from an organic impurity, which is probably oxalic acid resulting from the treatment. It may therefore be deduced that an analogous cause may be discovered in the case of other substances which disengage carbon dioxide.
PRESS
OF
~, B . L I P P I N C O T T COMPA~ PHILADELPHIA
CURRENT ToPics.
per cent. solutions. Fine dust is much more difficult to wet than coarse dust. The most efficient wetter and binder is a mixture of water-glass (sodium silicate), a resinous liquid soap (in 5 per cent. solutions), and commercial carbolic acid in the proportions Io: I: I. Dust thus treated is only inflammable with difficulty. Mechanical T h e o r y of Solar Corona. J. A. MILLER. (Astrophys. xxxiii, 3 o 3 . ) - - T h i s paper gives the results of an investigation of the streams of the 19o 5 solar corona, undertaken with the intention of applying Schaeberle's mechanical theory. With a few slight modifications of the original assumptions, the main criteria were taken as considering the streams of the corona to be the projections, on a plane, of streams of particles, the motions of which are produced by ejection, modified by the rotation of the sun, by its attraction, and by the pressure of its radiation. The tests were made by careful measurements of the curvatures of the streamers recorded on the Lick Observatory eclipse photographs. In many cases the actual forms observed were in very close agreement with those calculated from the theory. One notable feature is the persistence with which the convex edge of a streamer is sharply defined, while the other is diffuse. The calculations also agree with the actual photographs in showing that the farther from the equator at which a streamer originates, the larger will be the eccentricity of the orbits of the particles composing the stream. The shape of the streamers will be a function of the inclination of the sun's axis to the line of sight.
]ourn.,
Action of the R a d i u m E m a n a t i o n on T h o r i u m Salts. MESSRS. HERSCHFINKEL. (Mon. Sci., 838, 7 o 4 . ) - - T h e c~hclusions are that the action of the radium emanation on thorium nitrate is not a phenomenon of atomic transformation, but of oxidation; for an oxidizer, such as potassium permanganate, also produces carbon dioxide, but in larger quantity than the radium emanation. The production of this acid, then, is not due to the transformation of an atom of thorium into carbon, as Ramsay thought, but doubtless results from an organic impurity, which is probably oxalic acid resulting from the treatment. It may therefore be deduced that an analogous cause may be discovered in the case of other substances which disengage carbon dioxide.
PRESS
OF
~, B . L I P P I N C O T T COMPA~ PHILADELPHIA