Abstract
MONOCHROMATIC images of the sun, photo-graphically recorded with the spectrohelio-graph, reveal the phenomena of the solar atmosphere in projection against the disk. The light from a spectral line of calcium, hydrogen, or other substance is singled out by a narrow second slit, which moves across the plate while the first slit moves across the solar image. A monochromatic picture is thus built up of countless narrow slit images, recorded side by side in slow succession.
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HALE, G. The Spectrohelioscope. Nature 114, 628 (1924). https://doi.org/10.1038/114628a0
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DOI: https://doi.org/10.1038/114628a0