Abstract
THE PHOTOGRAPHY OF SOLAR PROMINENCES.—Mr. G. E. Hale, of Kenwood Physical Observatory, Chicago, describes in Astronomische Nachrichten, No. 3006, the results of some attempts made last winter to photograph solar prominences. One of the methods employed is to alter the rate of the driving clock of the equatorial, so that a prominence may move slowly across the slit of a spectroscope adjusted radially on the sun's image. A prominence line, say C, is brought into the centre of the field of the observing spectroscope, and at the same time falls upon a photographic plate having a motion such that the radius of curvature of the sun's limb upon it is the same as that of the focus of the equatorial.
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