Excerpt from The Astrophysical Journal, 1895, Vol. 33
The prominence described by Dr. Slocum in the Astrophysical Journal for September 1910 (32, 125), and figured in Plate XII, was photographed with the Kodaikanal spectroheliograph at each successive appearance on the sun's limb. Our photographs are very similar to those taken at the Yerkes Observatory, but. contrary to Dr. Slocum's experience, our K, flocculi plates show the prominence also as an absorption marking on the disk of the sun at three successive meridian transits. On the three days following March 22 the prominence is such a conspicuous and remarkable object on the disk that it is difficult to understand Dr. Slocum's failure to photograph it.
Taking advantage of the exceptional opportunity afforded by the disk photographs for determining the speed of angular rotation of the prominence, I have made a series of measures of a well-defined portion of the absorption marking, and the results of these measures, together with a spectrographic determination of rotation speed, are, I think, of sufficient interest to give in some detail.
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