Young, Charles A. (Charles Augustus), 1834-1908, Young, Anne Sewell, b. 1871., ed · Boston, New York [etc.] Ginn and Company · leaf 154
roscope, the observerwill then see a spectrum, the lower half of which, for instance,is made by sunlight, while the upper half is made by light com-ing from an electric arc containing the vapor, say of iron. In such comparisons photography may be most effectively usedinstead of the eye. Fig. 55 is… … Fig. 55. —Comparison of the Spectrum of Iron with the Solar Spectrum. Froma Negative by Professor Trowbridge. electric arc charged with the vapor of iron. In the original everyline of the iron spectrum coincides exactly with its correlative inthe solar spectrum, though in the engraving many of the…
Astronomy · Constellations
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