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Page:Popular Science Monthly Volume 65.djvu/12

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first slit, an image of the prominence will be recorded upon the plate. The principle of the instrument thus lies in photographing the solar

PSM V65 D012 Three results of solar photography.png

Fig. 1.—H and K Lines on the Disk, in the Chromosphere, and in a Prominence (a).

flame through a narrow slit, from which all light is excluded except that which is characteristic of the prominence itself.