Abstract
THE spectrohelioscope described in my article on “Some New Possibilities in Solar Research” (NATURE, July 3, 1926) has been provided with new oscillating slits and driving mechanism and an improved parallel-plate line shifter and micrometer for setting various parts of the Ha line on the second slit during observations, with divided arc indicating the exact wave-length employed. In this form the spectrohelioscope not only discloses the most delicate details of structure shown on the best Mount Wilson spectro-heliograms, but has also served for the detection and measurement of some new and interesting phenomena.
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HALE, G. Observations with the Spectrohelioscope. Nature 118, 420–421 (1926). https://doi.org/10.1038/118420a0
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DOI: https://doi.org/10.1038/118420a0