Abstract
IN the sketch appended to my letter on this subject in last week's NATURE, I notice that the engraver has made the line at 4.1 much too sharp and definite in both spectra. It really shades off rapidly to the more refrangible side, at least in the spectrum of the vacuum tube, and possibly also in that of the aurora. Though much the brightest line in the auroral spectrum, it is not the most conspicuous in that of the tube, but the relative brightness of lines frequently varies much at different temperatures. The band at 8 in the auroral spectrum is also represented too narrow. Those who have practical experience with the spectroscope will appreciate the great difficulty of representing faint spectra correctly in a woodcut.
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PROCTER, H. The Spectrum of the Aurora. Nature 3, 369 (1871). https://doi.org/10.1038/003369a0
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DOI: https://doi.org/10.1038/003369a0
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