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Triumphs and wonders of the 19th century, the true mirror of a phenomenal era, a volume of original, entertaining and instructive historic and descriptive writings, showing the many and marvellous achievements which distinguish an hundred years of material, intellectual, social and moral progress .. (1899)

Boyd, James Penny, 1836-1910 · Philadelphia, Pa., A. J. Holman & Co · leaf 217

An illustration from Triumphs and wonders of the 19th century, the true mirror of a phenomenal era, a volume of original, entertaining and instructive historic and descriptive writings, showing the many and marvellous achievements which distinguish an hundred years of material, intellectual, social and moral progress .., 1899, leaf 217
redue to something entirely independent of the earth. It remained for Bunsen and Kirchoff, in 1860, to point out the fact thatthese dark lines were characteristic of certain chemical elements existing inthe sun and its photosphere,, and this fact is the foundation of spectrum ana-lysis. The broad… … WILLIAM CRItOKE THE CENTURYS PROGRESS IN CHEMISTRY 201 therefore, that the two phenomena were due to the same cause; but why inthe one case should the band be black and in the other yellow . This ques-tion was answered by the discovery of the fact that a ray of light colored byincandescent sodium,…

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