ht, before entering the prism is passedthrough a narrow slit, the spectrum is crossed byseveral dark lines. These were subsequently exam-ined by Fraunhofer, who named seven of the principalones from seven letters of the alphabet,. BCDEFGH. The engraving shows the position of these in re-lation to… … given us the new method of spectral analysis, the re-sults of which are among the most wonderful of allthe marvels of science. This method, not only en-ables us to detect the presence of elements in quan-tities of inconceivable minuteness, but it has led tothe sublime discovery that some of the…
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