Abstract
HAVING lately devised a spectroscope with two small sextant telescopes and two small prisms, one of “extra dense” glass by Hilger, I attached it to a 2½-inch telescope, and tried its powers on the sun on the 6th inst., with the result that not only were the rays C and D3 easily visible as bright lines, but I also found that by opening the slit and keeping the brighter part of the spectrum out of view I could see the actual ragged surface of the “storm-tossed sea of hydrogen.”
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EVERSHED, J. The Chromosphere. Nature 37, 79 (1887). https://doi.org/10.1038/037079a0
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DOI: https://doi.org/10.1038/037079a0
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