Definitions
from The Century Dictionary.
- noun A line in the spectrum, caused if bright by iron in the luminous vapor, or if dark by iron in vapor interposed between the luminous body and the eye, as in the atmosphere of the sun.
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Examples
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A parallel observation was made at Dunecht, December 14, 1883, when it was noticed that a strong iron-line in the yellow part of the solar spectrum is permanently double on the sun's eastern, but single on his western limb; [636] opposite motion-displacements bringing about this curious effect of coincidence with, and separation from, an adjacent stationary line of our own atmosphere's production, according as the spectrum is derived from the retreating or advancing margin of the solar globe.
A Popular History of Astronomy During the Nineteenth Century Fourth Edition 1874
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