Abstract
IT is well that I should indicate the basis of these statements, and for this purpose I throw on the screen a very small part of the spectra of two or three different substances in order that you may see the way in which the work has been done. Take the lowest horizon. There we are dealing with zinc, and you see the way in which the triplets have been picked out. The triplet in each case, of course, supposing it is the remnant of a fluting, has its central line nearer to one side of the triplet than the other. All the triplets in the zinc spectrum are perfectly symmetrical from that point of view. If we take the upper spectrum—that of calcium—we find also that the triplets are formed in exactly the same way. We can quite understand the enormous labour which has been involved on the part of the inquirers I have named in working out from the spectra of a great many substances and from all the different regions of the spectrum, visible and photographic, these delicate triplets. In a great many cases they do not represent the strongest lines, those most easily seen, and they want a great deal of looking for.
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On Spectrum Series.1 II. Nature 60, 392–396 (1899). https://doi.org/10.1038/060392a0
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DOI: https://doi.org/10.1038/060392a0