CHAPTER IV

SOLAR SPECTROSCOPY

Chemistry of Prominences--Study of their Forms--Two Classes--Photographs and Spectrographs of Prominences--Their Distribution--Structure of the Chromosphere--Spectroscopic Measurement of Radial Movements--Spectroscopic Determination of Solar Rotation--Velocities of Transport in the Sun--Lockyer's Theory of Dissociation--Solar Constituents--Oxygen Absorption in Solar Spectrum 194

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