Papers Read Before the Medico-Legal Society of New York, From Its Organization. Second Series
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Thus iron, which • bas a very great number olUpes in the sun spectriim, h,as its most prominent line at E. C, F, and G are pecjuliar , to burn- ing hydrogen. Magnesium yields the C line and the H lines,; according to Angstroem, are peculiar tio calcium'. The D Une has a historical significance. Burning sodium yields thjia line. All the progres,s in spectroscopy is connected with this line. It is the source from which all the wonderful dis- coveries in solar and terrestrial chemistry had their o...rigin. This line D, called also the sodium line, can be resolved into two or even more lines by the aid of strong hght and the combination of several good, prisms, the nickel line lies right between them. The coincidence of the D line with that of burning sodium attracted the attention of Professor Kirch- hof , of Heidelberg. There was one thing in this coincidence that he could not at first explain. The sun line, as you see here, is a black line ; the line of burning sodium is a bright , yellow line, as you see here ; yet both occupy precisely the same position in the spectrum.
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