Abstract
IN a paper communicated to the Royal Society on December 12, 1872 (Phil. Trans. 1873, p. 253), I have shown that the test formerly relied on to decide the presence or absence of a metal in the sun, namely, the presence or absence of the brightest and strongest lines of the metal in question in the average solar spectrum, was not a final one, and that the true test was the presence or absence of the longest lines of the metal: this longest line being that which remains longest in the spectrum when the pressure of the vapour is reduced.
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LOCKYER, J. Preliminary Inquiry into the Existence of Elements in the Sun not Previously Traced * . Nature 11, 334–336 (1875). https://doi.org/10.1038/011334a0
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DOI: https://doi.org/10.1038/011334a0